css_module_lexer/

dependencies.rs

//! Dependency parser and lexer visitor implementation.

use rustc_hash::FxHashSet;
use smallvec::SmallVec;

use crate::{
  HandleWarning, Lexer, Pos,
  css_syntax::{
    MAX_CSS_KEYWORD_LEN, dashed_ident_name, dashed_ident_name_start, decode_css_keyword,
    is_css_modules_magic_comment, is_css_modules_pure_magic_comment, is_css_space_byte,
    is_css_white_space_char, lowercase_ascii_keyword, strip_vendor_prefix, trim_css_whitespace,
  },
  dependency_types::{
    Dependency, DependencyContext, Mode, Range, UrlRangeKind, ValueAtRuleImportItem, Warning,
    WarningKind,
  },
  lexer::{LexerVisitor, Token, TokenFlags, TokenKind, TokenStream},
};

/// Collects dashed identifiers while the dependency parser is in local mode.
#[derive(Debug, Default)]
pub struct DashedIdentCollector {
  occurrences: Vec<Range>,
  enabled: bool,
}

impl DashedIdentCollector {
  #[inline(always)]
  fn set_enabled(&mut self, enabled: bool) {
    self.enabled = enabled;
  }

  fn reserve(&mut self, additional: usize) {
    self.occurrences.reserve(additional);
  }

  fn take(&mut self) -> Vec<Range> {
    std::mem::take(&mut self.occurrences)
  }

  fn discard_last(&mut self, range: Range) {
    if self.occurrences.last() == Some(&range) {
      self.occurrences.pop();
    }
  }
}

impl LexerVisitor for DashedIdentCollector {
  #[inline(always)]
  fn visit_ident(&mut self, name: &str, range: Range) {
    if self.enabled
      && let Some(name_start) = dashed_ident_name_start(name)
    {
      self
        .occurrences
        .push(Range::new(range.start + name_start as Pos, range.end));
    }
  }
}

type DependencyLexer<'s> = Lexer<'s, DashedIdentCollector>;
type DependencyTokenStream<'a, 's> = TokenStream<'a, 's, DashedIdentCollector>;

#[derive(Debug)]
enum Scope<'s> {
  TopLevel,
  InBlock,
  InAtImport(ImportData<'s>),
  AtImportInvalid,
  AtNamespaceInvalid,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum ScanContext {
  TopLevel,
  BlockItem,
  Selector,
  DeclarationName,
  GenericValue,
  SpecialValue(PropertyKind),
  AtRule,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum PropertyKind {
  Generic,
  Animation,
  ListStyle,
  FontPalette,
  Container,
  Grid,
  Composes,
  CustomProperty,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum AtRuleKind {
  Namespace,
  Import,
  Charset,
  Value,
  Keyframes,
  Container,
  Function,
  Property,
  CounterStyle,
  FontPaletteValues,
  Scope,
  Other,
}

impl ScanContext {
  fn for_property(property: PropertyKind) -> Self {
    if property == PropertyKind::Generic {
      Self::GenericValue
    } else {
      Self::SpecialValue(property)
    }
  }
}

#[derive(Debug)]
struct ImportData<'s> {
  start: Pos,
  prelude: ImportPrelude<'s>,
  url: Option<&'s str>,
  url_flags: TokenFlags,
  url_range: Option<Range>,
  supports: ImportDataSupports<'s>,
  layer: ImportDataLayer<'s>,
}

impl ImportData<'_> {
  pub fn new(start: Pos) -> Self {
    Self {
      start,
      prelude: ImportPrelude::default(),
      url: None,
      url_flags: TokenFlags::ascii(),
      url_range: None,
      supports: ImportDataSupports::None,
      layer: ImportDataLayer::None,
    }
  }

  pub fn in_supports(&self) -> bool {
    matches!(self.supports, ImportDataSupports::InSupports { .. })
  }

  pub fn layer_range(&self) -> Option<&Range> {
    let ImportDataLayer::EndLayer { range, .. } = &self.layer else {
      return None;
    };
    Some(range)
  }

  pub fn supports_range(&self) -> Option<&Range> {
    let ImportDataSupports::EndSupports { range, .. } = &self.supports else {
      return None;
    };
    Some(range)
  }
}

#[derive(Debug, Default)]
struct ImportPrelude<'s>(SmallVec<[ImportPreludeNode<'s>; 2]>);

impl<'s> ImportPrelude<'s> {
  pub fn push(&mut self, node: ImportPreludeNode<'s>) {
    self.0.push(node);
  }

  pub fn is_empty(&self) -> bool {
    self.0.is_empty()
  }

  pub fn icss_import_url(&self) -> Option<(&'s str, &Range)> {
    let [ImportPreludeNode::IcssUrlCandidate { name, range }] = self.0.as_slice() else {
      return None;
    };
    Some((name, range))
  }

  pub fn first_non_url_before(&self, url_range: &Range) -> Option<&Range> {
    self.0.iter().find_map(|node| {
      let range = node.range();
      if range.start >= url_range.start || matches!(node, ImportPreludeNode::Url { .. }) {
        None
      } else {
        Some(range)
      }
    })
  }
}

#[derive(Debug)]
enum ImportPreludeNode<'s> {
  IcssUrlCandidate { name: &'s str, range: Range },
  Url { range: Range },
  Layer { range: Range },
  Supports { range: Range },
  Other { range: Range },
}

impl ImportPreludeNode<'_> {
  fn range(&self) -> &Range {
    match self {
      Self::IcssUrlCandidate { range, .. }
      | Self::Url { range }
      | Self::Layer { range }
      | Self::Supports { range }
      | Self::Other { range } => range,
    }
  }
}

#[derive(Debug)]
enum ImportDataSupports<'s> {
  None,
  InSupports,
  EndSupports { value: &'s str, range: Range },
}

#[derive(Debug)]
enum ImportDataLayer<'s> {
  None,
  EndLayer { value: &'s str, range: Range },
}

#[derive(Debug, Default)]
struct BalancedStack(SmallVec<[BalancedItem; 3]>);

impl BalancedStack {
  pub fn len(&self) -> usize {
    self.0.len()
  }

  pub fn last(&self) -> Option<&BalancedItem> {
    self.0.last()
  }

  pub fn is_empty(&self) -> bool {
    self.0.is_empty()
  }

  pub fn push(&mut self, item: BalancedItem, mode_data: Option<&mut ModeData>) {
    if let Some(mode_data) = mode_data {
      if item.kind.is_mode_local() {
        mode_data.set_current_mode(Mode::Local);
      } else if item.kind.is_mode_global() {
        mode_data.set_current_mode(Mode::Global);
      }

      if item.kind.is_mode_function() {
        mode_data.inside_mode_function += 1;
      } else if item.kind.is_mode_class() {
        mode_data.inside_mode_class += 1;
      }
    }
    self.0.push(item);
  }

  pub fn pop(&mut self, mode_data: Option<&mut ModeData>) -> Option<BalancedItem> {
    let item = self.0.pop()?;
    if let Some(mode_data) = mode_data {
      if item.kind.is_mode_function() {
        mode_data.inside_mode_function -= 1;
      } else if item.kind.is_mode_class() {
        mode_data.inside_mode_class -= 1;
      }
      self.update_current_mode(mode_data);
    }
    Some(item)
  }

  pub fn pop_without_moda_data(&mut self) -> Option<BalancedItem> {
    self.0.pop()
  }

  pub fn pop_mode_pseudo_class(&mut self, mode_data: &mut ModeData) {
    loop {
      if let Some(last) = self.0.last()
        && matches!(
          last.kind,
          BalancedItemKind::LocalClass | BalancedItemKind::GlobalClass
        )
      {
        mode_data.inside_mode_class -= 1;
        self.0.pop();
        continue;
      }
      break;
    }
    self.update_current_mode(mode_data);
  }

  pub fn update_current_mode(&self, mode_data: &mut ModeData) {
    mode_data.set_current_mode(self.topmost_mode(mode_data));
  }

  pub fn update_property_mode(&self, mode_data: &mut ModeData) {
    mode_data.set_property_mode(self.topmost_mode(mode_data));
  }

  fn topmost_mode(&self, mode_data: &ModeData) -> Mode {
    let mut iter = self.0.iter();
    loop {
      if let Some(last) = iter.next_back() {
        if matches!(
          last.kind,
          BalancedItemKind::LocalFn | BalancedItemKind::LocalClass
        ) {
          return Mode::Local;
        } else if matches!(
          last.kind,
          BalancedItemKind::GlobalFn | BalancedItemKind::GlobalClass
        ) {
          return Mode::Global;
        }
      } else {
        return mode_data.default_mode();
      }
    }
  }
}

#[derive(Debug)]
struct BalancedItem {
  kind: BalancedItemKind,
  range: Range,
}

impl BalancedItem {
  pub fn new(name: &str, flags: TokenFlags, start: Pos, end: Pos) -> Self {
    let mut normalized = [0; MAX_CSS_KEYWORD_LEN];
    let kind = if flags.has_escape() {
      decode_css_keyword(name, &mut normalized)
        .map_or(BalancedItemKind::Other, BalancedItemKind::new)
    } else {
      lowercase_ascii_keyword(name, &mut normalized)
        .map_or(BalancedItemKind::Other, BalancedItemKind::new)
    };
    Self {
      kind,
      range: Range::new(start, end),
    }
  }

  pub fn new_normalized(name: &str, start: Pos, end: Pos) -> Self {
    Self {
      kind: BalancedItemKind::new(name),
      range: Range::new(start, end),
    }
  }

  pub fn new_other(start: Pos, end: Pos) -> Self {
    Self {
      kind: BalancedItemKind::Other,
      range: Range::new(start, end),
    }
  }

  pub fn new_curly(start: Pos, end: Pos) -> Self {
    Self {
      kind: BalancedItemKind::Curly,
      range: Range::new(start, end),
    }
  }
}

#[derive(Debug)]
enum BalancedItemKind {
  Url,
  ImageSet,
  Layer,
  Supports,
  PaletteMix,
  LocalFn,
  GlobalFn,
  LocalClass,
  GlobalClass,
  Curly,
  Other,
}

impl BalancedItemKind {
  pub fn new(name: &str) -> Self {
    match name {
      "url(" => Self::Url,
      "image-set(" => Self::ImageSet,
      _ if strip_vendor_prefix(name) == Some("image-set(") => Self::ImageSet,
      "layer(" => Self::Layer,
      "supports(" => Self::Supports,
      "palette-mix(" => Self::PaletteMix,
      ":local(" => Self::LocalFn,
      ":global(" => Self::GlobalFn,
      ":local" => Self::LocalClass,
      ":global" => Self::GlobalClass,
      _ => Self::Other,
    }
  }

  pub fn is_mode_local(&self) -> bool {
    matches!(self, Self::LocalFn | Self::LocalClass)
  }

  pub fn is_mode_global(&self) -> bool {
    matches!(self, Self::GlobalFn | Self::GlobalClass)
  }

  pub fn is_mode_function(&self) -> bool {
    matches!(self, Self::LocalFn | Self::GlobalFn)
  }

  pub fn is_mode_class(&self) -> bool {
    matches!(self, Self::LocalClass | Self::GlobalClass)
  }
}

fn trivia_only(input: &str) -> bool {
  if input.is_empty() {
    return false;
  }
  let bytes = input.as_bytes();
  let mut position = 0;
  while position < bytes.len() {
    if is_css_space_byte(bytes[position]) {
      position += 1;
      continue;
    }
    if position + 1 < bytes.len() && bytes[position] == b'/' && bytes[position + 1] == b'*' {
      position += 2;
      while position + 1 < bytes.len() && !(bytes[position] == b'*' && bytes[position + 1] == b'/')
      {
        position += 1;
      }
      if position + 1 >= bytes.len() {
        return false;
      }
      position += 2;
      continue;
    }
    return false;
  }
  true
}

fn token_text(input: &str, token: Token) -> &str {
  Lexer::slice_range(input, &token.range).unwrap_or("")
}

fn is_ascii_keyword(name: &str, expected: &str) -> bool {
  name.eq_ignore_ascii_case(expected)
}

fn is_open_token(kind: TokenKind) -> bool {
  matches!(
    kind,
    TokenKind::Function
      | TokenKind::LeftParenthesis
      | TokenKind::LeftSquareBracket
      | TokenKind::LeftCurlyBracket
  )
}

fn is_close_token(kind: TokenKind) -> bool {
  matches!(
    kind,
    TokenKind::RightParenthesis | TokenKind::RightSquareBracket | TokenKind::RightCurlyBracket
  )
}

fn ident_like_range(token: Token) -> Option<Range> {
  match token.kind {
    TokenKind::Ident => Some(token.range),
    TokenKind::Function => Some(token.value_range),
    _ => None,
  }
}

/// Token-aligned split of an import item by a top-level colon or `as` ident.
/// Names are delimited by the surrounding significant tokens, so comments and
/// whitespace at the split points stay out of the names.
#[derive(Debug, Clone, Copy)]
struct ValueAtRuleSplit {
  split: Pos,
  end: Pos,
  prev_end: Pos,
  next_start: Option<Pos>,
}

/// Streaming state for a single `@value` at-rule. Tokens are consumed one at a
/// time; completed import items are written into the [`DependencyContext`] side
/// table immediately instead of collecting a token buffer first.
struct ValueAtRuleStream<'s> {
  input: &'s str,
  depth: u32,
  params_end: Pos,
  first_significant: Option<(Pos, Pos)>,
  significant_count: u32,
  first_colon: Option<ValueAtRuleSplit>,
  first_colon_tokens_after: u32,
  item_start: Option<Pos>,
  item_end: Pos,
  item_colon: Option<ValueAtRuleSplit>,
  item_as: Option<ValueAtRuleSplit>,
  last_significant: Option<Token>,
  penultimate_significant: Option<Token>,
  from_pos: Option<Pos>,
  from_prev_end: Option<Pos>,
}

impl<'s> ValueAtRuleStream<'s> {
  fn new(input: &'s str) -> Self {
    Self {
      input,
      depth: 0,
      params_end: 0,
      first_significant: None,
      significant_count: 0,
      first_colon: None,
      first_colon_tokens_after: 0,
      item_start: None,
      item_end: 0,
      item_colon: None,
      item_as: None,
      last_significant: None,
      penultimate_significant: None,
      from_pos: None,
      from_prev_end: None,
    }
  }

  fn push(&mut self, context: &mut DependencyContext<'s>, token: Token) {
    if matches!(token.kind, TokenKind::Comment | TokenKind::BadComment) {
      self.params_end = token.range.end;
      return;
    }
    self.params_end = token.range.end;
    if self.first_significant.is_none() {
      self.first_significant = Some((token.range.start, token.range.end));
    }
    self.significant_count += 1;
    let had_first_colon = self.first_colon.is_some();

    self.depth = (self.depth + u32::from(is_open_token(token.kind)))
      .saturating_sub(u32::from(is_close_token(token.kind)));
    let at_top = self.depth == 0;
    let is_ident = token.kind == TokenKind::Ident;
    let text = if is_ident {
      self
        .input
        .get(token.range.start as usize..token.range.end as usize)
        .unwrap_or("")
    } else {
      ""
    };
    if at_top {
      if token.kind == TokenKind::Colon {
        let split = ValueAtRuleSplit {
          split: token.range.start,
          end: token.range.end,
          prev_end: self
            .last_significant
            .map_or(token.range.start, |previous| previous.range.end),
          next_start: None,
        };
        if self.first_colon.is_none() {
          self.first_colon = Some(split);
        }
        if self.item_colon.is_none() {
          self.item_colon = Some(split);
        }
      }
      if is_ident && text.eq_ignore_ascii_case("as") {
        self.item_as = Some(ValueAtRuleSplit {
          split: token.range.start,
          end: token.range.end,
          prev_end: self
            .last_significant
            .map_or(token.range.start, |previous| previous.range.end),
          next_start: None,
        });
      }
      if is_ident
        && text.eq_ignore_ascii_case("from")
        && let Some(previous) = self.last_significant
      {
        let gap = self
          .input
          .get(previous.range.end as usize..token.range.start as usize)
          .unwrap_or("");
        if trivia_only(gap) {
          self.from_pos = Some(token.range.start);
          self.from_prev_end = Some(previous.range.end);
        }
      }
      self.penultimate_significant = self.last_significant;
      self.last_significant = Some(token);
    }
    if had_first_colon {
      self.first_colon_tokens_after += 1;
    }

    if token.kind == TokenKind::Comma && at_top {
      self.finish_item(context, self.item_end);
      self.item_start = None;
      self.item_colon = None;
      self.item_as = None;
    } else {
      if self.item_start.is_none() {
        self.item_start = Some(token.range.start);
      }
      self.item_end = token.range.end;
      if let Some(split) = self.item_colon.as_mut()
        && split.next_start.is_none()
        && split.split != token.range.start
      {
        split.next_start = Some(token.range.start);
      }
      if let Some(split) = self.item_as.as_mut()
        && split.next_start.is_none()
        && split.split != token.range.start
      {
        split.next_start = Some(token.range.start);
      }
    }
  }

  fn finish_item(&mut self, context: &mut DependencyContext<'s>, end: Pos) {
    let Some(item_start) = self.item_start else {
      return;
    };
    if end.saturating_sub(item_start) >= 2
      && self.input.as_bytes()[item_start as usize] == b'('
      && self.input.as_bytes()[end as usize - 1] == b')'
    {
      self.parse_paren_items(context, item_start + 1, end - 1);
    } else {
      let item = self.build_item(item_start, end, self.item_colon, self.item_as);
      if !item.local_name().is_empty() || !item.import_name().is_empty() {
        context.push_value_at_rule_import_item(item);
      }
    }
  }

  fn build_item(
    &self,
    start: Pos,
    end: Pos,
    colon: Option<ValueAtRuleSplit>,
    as_split: Option<ValueAtRuleSplit>,
  ) -> ValueAtRuleImportItem<'s> {
    let slice = |a: Pos, b: Pos| -> &'s str {
      if a >= b {
        ""
      } else {
        &self.input[a as usize..b as usize]
      }
    };
    if let Some(split) = colon {
      return ValueAtRuleImportItem::new(
        slice(start, split.prev_end),
        split
          .next_start
          .map_or("", |next_start| slice(next_start, end)),
      );
    }
    if let Some(split) = as_split {
      let import_name = slice(start, split.prev_end);
      let local_name = split
        .next_start
        .map_or("", |next_start| slice(next_start, end));
      if !import_name.is_empty() && !local_name.is_empty() {
        return ValueAtRuleImportItem::new(local_name, import_name);
      }
    }
    let value = slice(start, end);
    ValueAtRuleImportItem::new(value, value)
  }

  /// Re-parses a parenthesized item: the inner content was not streamed
  /// token-by-token, so it is tokenized once more and split at depth-zero
  /// commas, mirroring the legacy aligned-token behavior.
  fn parse_paren_items(&mut self, context: &mut DependencyContext<'s>, start: Pos, end: Pos) {
    let slice = &self.input[start as usize..end as usize];
    let mut lexer = Lexer::new(slice, ());
    let mut tokens: SmallVec<[Token; 8]> = SmallVec::new();
    loop {
      let token = lexer.next_token();
      if token.kind == TokenKind::Eof {
        break;
      }
      if matches!(
        token.kind,
        TokenKind::Comment | TokenKind::BadComment | TokenKind::WhiteSpace
      ) {
        continue;
      }
      tokens.push(token);
    }
    let mut item_start = 0;
    let mut item_depth = 0u32;
    for (index, token) in tokens.iter().copied().enumerate() {
      if is_close_token(token.kind) {
        item_depth = item_depth.saturating_sub(1);
      }
      if token.kind == TokenKind::Comma && item_depth == 0 {
        self.push_parsed_item(context, &tokens, item_start, index, slice);
        item_start = index + 1;
      }
      if is_open_token(token.kind) {
        item_depth += 1;
      }
    }
    self.push_parsed_item(context, &tokens, item_start, tokens.len(), slice);
  }

  fn push_parsed_item(
    &mut self,
    context: &mut DependencyContext<'s>,
    tokens: &[Token],
    start: usize,
    end: usize,
    slice: &'s str,
  ) {
    let mut depth = 0u32;
    let mut colon_index = None;
    let mut as_index = None;
    for (index, token) in tokens[start..end].iter().copied().enumerate() {
      let index = start + index;
      if is_close_token(token.kind) {
        depth = depth.saturating_sub(1);
      }
      if depth == 0 {
        if token.kind == TokenKind::Colon && colon_index.is_none() {
          colon_index = Some(index);
        }
        if token.kind == TokenKind::Ident && token_text(slice, token).eq_ignore_ascii_case("as") {
          as_index = Some(index);
        }
      }
      if is_open_token(token.kind) {
        depth += 1;
      }
    }
    let span = |a: usize, b: usize| -> &'s str {
      if a >= b {
        ""
      } else {
        &slice[tokens[a].range.start as usize..tokens[b - 1].range.end as usize]
      }
    };
    let item = if let Some(index) = colon_index {
      ValueAtRuleImportItem::new(span(start, index), span(index + 1, end))
    } else if let Some(index) = as_index {
      let import_name = span(start, index);
      let local_name = span(index + 1, end);
      if !import_name.is_empty() && !local_name.is_empty() {
        ValueAtRuleImportItem::new(local_name, import_name)
      } else {
        ValueAtRuleImportItem::new("", "")
      }
    } else {
      let value = span(start, end);
      ValueAtRuleImportItem::new(value, value)
    };
    if !item.local_name().is_empty() || !item.import_name().is_empty() {
      context.push_value_at_rule_import_item(item);
    }
  }

  /// Returns the last two significant tokens, or `None` if there are fewer
  /// than two.
  fn last_two(&self) -> Option<(Token, Token)> {
    Some((self.penultimate_significant?, self.last_significant?))
  }
}

#[derive(Debug)]
pub struct ModeData<'s> {
  default: Mode,
  current: Mode,
  property: Mode,
  resulting_global: Option<Pos>,
  pure_global: Option<Pos>,
  pure_no_check: bool,
  pure_ignore_pending: bool,
  pure_ignored_block_nesting_level: Option<u32>,
  composes_local_classes: ComposesLocalClasses<'s>,
  inside_mode_function: u32,
  inside_mode_class: u32,
}

impl ModeData<'_> {
  pub fn new(default: Mode) -> Self {
    Self {
      default,
      current: default,
      property: default,
      resulting_global: None,
      pure_global: Some(0),
      pure_no_check: false,
      pure_ignore_pending: false,
      pure_ignored_block_nesting_level: None,
      composes_local_classes: ComposesLocalClasses::default(),
      inside_mode_function: 0,
      inside_mode_class: 0,
    }
  }

  pub fn is_pure_mode(&self) -> bool {
    matches!(self.default, Mode::Pure)
  }

  pub fn mark_pure_ignore(&mut self) {
    if self.is_pure_mode() {
      self.pure_ignore_pending = true;
    }
  }

  pub fn mark_pure_no_check(&mut self) {
    if self.is_pure_mode() {
      self.pure_no_check = true;
    }
  }

  pub fn is_pure_check_disabled(&self) -> bool {
    self.pure_no_check
      || self.pure_ignore_pending
      || self.pure_ignored_block_nesting_level.is_some()
  }

  pub fn enter_block(&mut self, block_nesting_level: u32) {
    if self.pure_ignore_pending {
      self.pure_ignore_pending = false;
      if self.pure_ignored_block_nesting_level.is_none() {
        self.pure_ignored_block_nesting_level = Some(block_nesting_level);
      }
    }
  }

  pub fn clear_pure_ignore_pending(&mut self) {
    self.pure_ignore_pending = false;
  }

  pub fn exit_block(&mut self, block_nesting_level: u32) {
    if self
      .pure_ignored_block_nesting_level
      .is_some_and(|level| block_nesting_level < level)
    {
      self.pure_ignored_block_nesting_level = None;
    }
  }

  pub fn is_current_local_mode(&self) -> bool {
    match self.current {
      Mode::Local | Mode::Pure => true,
      Mode::Global | Mode::Css => false,
    }
  }

  pub fn is_property_local_mode(&self) -> bool {
    match self.property {
      Mode::Local | Mode::Pure => true,
      Mode::Global | Mode::Css => false,
    }
  }

  pub fn default_mode(&self) -> Mode {
    self.default
  }

  pub fn set_current_mode(&mut self, mode: Mode) {
    self.current = mode;
  }

  pub fn set_property_mode(&mut self, mode: Mode) {
    self.property = mode;
  }

  pub fn is_inside_mode_function(&self) -> bool {
    self.inside_mode_function > 0
  }

  pub fn is_inside_mode_class(&self) -> bool {
    self.inside_mode_class > 0
  }

  pub fn is_mode_explicit(&self) -> bool {
    self.is_inside_mode_function() || self.is_inside_mode_class()
  }
}

#[derive(Debug, Default, Clone)]
struct ComposesLocalClasses<'s> {
  is_single: SingleLocalClass,
  local_classes: SmallVec<[&'s str; 2]>,
}

impl<'s> ComposesLocalClasses<'s> {
  pub fn get_valid_local_classes(
    &mut self,
    lexer: &DependencyLexer<'s>,
  ) -> Option<SmallVec<[&'s str; 2]>> {
    if let SingleLocalClass::Single(range) = &self.is_single {
      let mut local_classes = self.local_classes.clone();
      local_classes.push(lexer.slice(range.start, range.end)?);
      Some(local_classes)
    } else {
      self.reset_to_initial();
      None
    }
  }

  pub fn invalidate(&mut self) {
    if !matches!(self.is_single, SingleLocalClass::AtKeyword) {
      self.is_single = SingleLocalClass::Invalid;
      self.local_classes.clear();
    }
  }

  pub fn find_local_class(&mut self, start: Pos, end: Pos) {
    match self.is_single {
      SingleLocalClass::Initial => {
        self.is_single = SingleLocalClass::Single(Range::new(start, end))
      }
      SingleLocalClass::Single(_) => {
        self.is_single = SingleLocalClass::Invalid;
        self.local_classes.clear();
      }
      _ => {}
    };
  }

  pub fn find_at_keyword(&mut self) {
    self.is_single = SingleLocalClass::AtKeyword;
    self.local_classes.clear();
  }

  pub fn reset_to_initial(&mut self) {
    self.is_single = SingleLocalClass::Initial;
    self.local_classes.clear();
  }

  pub fn find_comma(&mut self, lexer: &DependencyLexer<'s>) -> Option<()> {
    if let SingleLocalClass::Single(range) = &self.is_single {
      self
        .local_classes
        .push(lexer.slice(range.start, range.end)?);
      self.is_single = SingleLocalClass::Initial
    } else {
      self.is_single = SingleLocalClass::Invalid;
    }
    Some(())
  }
}

#[derive(Debug, Default, Clone)]
enum SingleLocalClass {
  #[default]
  Initial,
  Single(Range),
  AtKeyword,
  Invalid,
}

#[derive(Debug)]
struct InProperty<T: ReservedValues> {
  reserved: T,
  rename: Option<Range>,
  balanced_len: usize,
}

impl<T: ReservedValues> InProperty<T> {
  pub fn new(reserved: T, balanced_len: usize) -> Self {
    Self {
      reserved,
      rename: None,
      balanced_len,
    }
  }

  fn check_reserved(&mut self, ident: &str, flags: TokenFlags) -> bool {
    self.reserved.check(ident, flags)
  }

  pub fn reset_reserved(&mut self) {
    self.reserved.reset();
  }

  pub fn set_rename(&mut self, ident: &str, flags: TokenFlags, range: Range) {
    if self.check_reserved(ident, flags) {
      self.rename = Some(range);
    }
  }

  pub fn take_rename(&mut self, balanced_len: usize) -> Option<Range> {
    // Don't rename when we in functions
    if balanced_len != self.balanced_len {
      return None;
    }
    std::mem::take(&mut self.rename)
  }
}

trait ReservedValues {
  fn check(&mut self, ident: &str, flags: TokenFlags) -> bool;
  fn reset(&mut self);
}

#[derive(Debug, Default)]
struct AnimationReserved {
  bits: u32,
}

impl ReservedValues for AnimationReserved {
  fn check(&mut self, ident: &str, flags: TokenFlags) -> bool {
    let mut lowercase = [0; MAX_CSS_KEYWORD_LEN];
    let ident = if flags.has_escape() {
      decode_css_keyword(ident, &mut lowercase)
    } else {
      lowercase_ascii_keyword(ident, &mut lowercase)
    };
    let Some(ident) = ident else {
      return true;
    };
    match ident {
            "normal" => self.check_and_update(Self::NORMAL),
            "reverse" => self.check_and_update(Self::REVERSE),
            "alternate" => self.check_and_update(Self::ALTERNATE),
            "alternate-reverse" => self.check_and_update(Self::ALTERNATE_REVERSE),
            "forwards" => self.check_and_update(Self::FORWARDS),
            "backwards" => self.check_and_update(Self::BACKWARDS),
            "both" => self.check_and_update(Self::BOTH),
            "infinite" => self.check_and_update(Self::INFINITE),
            "paused" => self.check_and_update(Self::PAUSED),
            "running" => self.check_and_update(Self::RUNNING),
            "ease" => self.check_and_update(Self::EASE),
            "ease-in" => self.check_and_update(Self::EASE_IN),
            "ease-out" => self.check_and_update(Self::EASE_OUT),
            "ease-in-out" => self.check_and_update(Self::EASE_IN_OUT),
            "linear" => self.check_and_update(Self::LINEAR),
            "step-end" => self.check_and_update(Self::STEP_END),
            "step-start" => self.check_and_update(Self::STEP_START),
            // keywords values
            "none" |
            // global values
            "initial" | "inherit" | "unset" | "revert" | "revert-layer" => false,
            _ => true,
        }
  }

  fn reset(&mut self) {
    self.bits = 0;
  }
}

impl AnimationReserved {
  const NORMAL: u32 = 1 << 0;
  const REVERSE: u32 = 1 << 1;
  const ALTERNATE: u32 = 1 << 2;
  const ALTERNATE_REVERSE: u32 = 1 << 3;
  const FORWARDS: u32 = 1 << 4;
  const BACKWARDS: u32 = 1 << 5;
  const BOTH: u32 = 1 << 6;
  const INFINITE: u32 = 1 << 7;
  const PAUSED: u32 = 1 << 8;
  const RUNNING: u32 = 1 << 9;
  const EASE: u32 = 1 << 10;
  const EASE_IN: u32 = 1 << 11;
  const EASE_OUT: u32 = 1 << 12;
  const EASE_IN_OUT: u32 = 1 << 13;
  const LINEAR: u32 = 1 << 14;
  const STEP_END: u32 = 1 << 15;
  const STEP_START: u32 = 1 << 16;

  fn check_and_update(&mut self, bit: u32) -> bool {
    if self.bits & bit == bit {
      return true;
    }
    self.bits |= bit;
    false
  }
}

#[derive(Debug, Default)]
struct ListStyleReserved;

impl ReservedValues for ListStyleReserved {
  fn check(&mut self, ident: &str, flags: TokenFlags) -> bool {
    let mut lowercase = [0; MAX_CSS_KEYWORD_LEN];
    let ident = if flags.has_escape() {
      decode_css_keyword(ident, &mut lowercase)
    } else {
      lowercase_ascii_keyword(ident, &mut lowercase)
    };
    let Some(ident) = ident else {
      return true;
    };
    match ident {
            // https://www.w3.org/TR/css-counter-styles-3/#simple-numeric
            "decimal"
            | "decimal-leading-zero"
            | "arabic-indic"
            | "armenian"
            | "upper-armenian"
            | "lower-armenian"
            | "bengali"
            | "cambodian"
            | "khmer"
            | "cjk-decimal"
            | "devanagari"
            | "georgian"
            | "gujarati"
            | "gurmukhi"
            | "hebrew"
            | "kannada"
            | "lao"
            | "malayalam"
            | "mongolian"
            | "myanmar"
            | "oriya"
            | "persian"
            | "lower-roman"
            | "upper-roman"
            | "tamil"
            | "telugu"
            | "thai"
            | "tibetan"
            // https://www.w3.org/TR/css-counter-styles-3/#simple-alphabetic
            | "lower-alpha"
            | "lower-latin"
            | "upper-alpha"
            | "upper-latin"
            | "lower-greek"
            | "hiragana"
            | "hiragana-iroha"
            | "katakana"
            | "katakana-iroha"
            // https://www.w3.org/TR/css-counter-styles-3/#simple-symbolic
            | "disc"
            | "circle"
            | "square"
            | "disclosure-open"
            | "disclosure-closed"
            // https://www.w3.org/TR/css-counter-styles-3/#simple-fixed
            | "cjk-earthly-branch"
            | "cjk-heavenly-stem"
            // https://www.w3.org/TR/css-counter-styles-3/#complex-cjk
            | "japanese-informal"
            | "japanese-formal"
            | "korean-hangul-formal"
            | "korean-hanja-informal"
            | "korean-hanja-formal"
            | "simp-chinese-informal"
            | "simp-chinese-formal"
            | "trad-chinese-informal"
            | "trad-chinese-formal"
            | "ethiopic-numeric"
            // keywords values
            | "none"
            // global values
            | "initial"
            | "inherit"
            | "unset"
            | "revert"
            | "revert-layer" => false,
            _ => true,
        }
  }

  fn reset(&mut self) {}
}

#[derive(Debug, Default)]
struct FontPaletteReserved;

impl ReservedValues for FontPaletteReserved {
  fn check(&mut self, ident: &str, _flags: TokenFlags) -> bool {
    ident.starts_with("--")
  }

  fn reset(&mut self) {}
}

#[derive(Debug, Default)]
struct ContainerReserved;

impl ReservedValues for ContainerReserved {
  fn check(&mut self, ident: &str, flags: TokenFlags) -> bool {
    let mut lowercase = [0; MAX_CSS_KEYWORD_LEN];
    let ident = if flags.has_escape() {
      decode_css_keyword(ident, &mut lowercase)
    } else {
      lowercase_ascii_keyword(ident, &mut lowercase)
    };
    let Some(ident) = ident else {
      return true;
    };
    !matches!(
      ident,
      "normal"
        | "size"
        | "inline-size"
        | "scroll-state"
        | "none"
        | "initial"
        | "inherit"
        | "unset"
        | "revert"
        | "revert-layer"
    )
  }

  fn reset(&mut self) {}
}

#[derive(Debug, Clone, Copy)]
enum GridPropertyKind {
  Generic,
  TemplateLike,
  TemplateAreas,
}

fn grid_property_kind(ident: &str) -> Option<GridPropertyKind> {
  match ident {
    "grid" | "grid-area" | "grid-column" | "grid-column-end" | "grid-column-start" | "grid-row"
    | "grid-row-end" | "grid-row-start" => Some(GridPropertyKind::Generic),
    "grid-template" | "grid-template-columns" | "grid-template-rows" => {
      Some(GridPropertyKind::TemplateLike)
    }
    "grid-template-areas" => Some(GridPropertyKind::TemplateAreas),
    _ => None,
  }
}

fn is_reserved_grid_ident(ident: &str, flags: TokenFlags) -> bool {
  let mut lowercase = [0; MAX_CSS_KEYWORD_LEN];
  let ident = if flags.has_escape() {
    decode_css_keyword(ident, &mut lowercase)
  } else {
    lowercase_ascii_keyword(ident, &mut lowercase)
  };
  let Some(ident) = ident else {
    return false;
  };
  matches!(
    ident,
    "auto"
      | "span"
      | "auto-flow"
      | "dense"
      | "row"
      | "column"
      | "none"
      | "subgrid"
      | "masonry"
      | "max-content"
      | "min-content"
      | "initial"
      | "inherit"
      | "unset"
      | "revert"
      | "revert-layer"
  )
}

/// Decide whether a raw-scanned ident inside a special property value must be
/// handed back to the regular tokenizer. The check applies to plain idents and
/// function names alike: `url`/`var`/`image-set` and `--`-prefixed functions
/// are stopped by the caller's generic dependency-function rule, while any
/// other non-reserved function name also stops the scan so the tokenizer can
/// push it onto the balanced stack. `icss_symbols` is only consulted for the
/// property kinds whose values can reference ICSS symbols.
pub(crate) fn special_value_is_candidate(
  property: PropertyKind,
  ident: &str,
  icss_symbols: Option<&FxHashSet<&str>>,
) -> bool {
  if icss_symbols.is_some_and(|symbols| symbols.contains(ident)) {
    return true;
  }
  match property {
    PropertyKind::ListStyle => ListStyleReserved.check(ident, TokenFlags::ascii()),
    PropertyKind::FontPalette => ident.starts_with("--"),
    PropertyKind::Container => ContainerReserved.check(ident, TokenFlags::ascii()),
    PropertyKind::Grid => !is_reserved_grid_ident(ident, TokenFlags::ascii()),
    PropertyKind::Animation
    | PropertyKind::Generic
    | PropertyKind::Composes
    | PropertyKind::CustomProperty => false,
  }
}

fn is_reserved_container_query_ident(ident: &str, flags: TokenFlags) -> bool {
  let mut lowercase = [0; MAX_CSS_KEYWORD_LEN];
  let ident = if flags.has_escape() {
    decode_css_keyword(ident, &mut lowercase)
  } else {
    lowercase_ascii_keyword(ident, &mut lowercase)
  };
  let Some(ident) = ident else {
    return false;
  };
  matches!(ident, "none" | "and" | "or" | "not")
}

fn parse_grid_template_area_ranges(input: &str, offset: Pos) -> impl Iterator<Item = Range> + '_ {
  let bytes = input.as_bytes();
  let mut i = 0usize;

  std::iter::from_fn(move || {
    loop {
      while i < bytes.len() && bytes[i].is_ascii_whitespace() {
        i += 1;
      }
      let start = i;
      while i < bytes.len() && !bytes[i].is_ascii_whitespace() {
        i += 1;
      }
      if start == i {
        return None;
      }
      if !input[start..i].bytes().all(|c| c == b'.') {
        return Some(Range::new(offset + start as Pos, offset + i as Pos));
      }
    }
  })
}

#[derive(Debug)]
pub struct LexDependencies<'s, W> {
  dependency_context: DependencyContext<'s>,
  mode_data: Option<ModeData<'s>>,
  scope: Scope<'s>,
  block_nesting_level: u32,
  allow_import_at_rule: bool,
  balanced: BalancedStack,
  is_next_rule_prelude: bool,
  scan_context: ScanContext,
  selector_square_depth: u32,
  selector_fast_forward_enabled: bool,
  property_kind: PropertyKind,
  in_animation_property: Option<InProperty<AnimationReserved>>,
  in_list_style_property: Option<InProperty<ListStyleReserved>>,
  in_font_palette_property: Option<InProperty<FontPaletteReserved>>,
  in_container_property: Option<InProperty<ContainerReserved>>,
  in_grid_property: Option<GridPropertyKind>,
  icss_symbols: FxHashSet<&'s str>,
  icss_symbol_filter: [u64; 16],
  icss_symbol_min_len: usize,
  icss_symbol_max_len: usize,
  pending_custom_property: Option<Range>,
  pending_grid_property: Option<GridPropertyKind>,
  handle_warning: W,
}

impl<'s, W: HandleWarning<'s>> LexDependencies<'s, W> {
  pub fn new(handle_warning: W, mode: Mode) -> Self {
    Self::with_context(DependencyContext::new(), handle_warning, mode)
  }

  pub(crate) fn with_context(
    dependency_context: DependencyContext<'s>,
    handle_warning: W,
    mode: Mode,
  ) -> Self {
    Self {
      dependency_context,
      mode_data: if mode == Mode::Css {
        None
      } else {
        Some(ModeData::new(mode))
      },
      scope: Scope::TopLevel,
      block_nesting_level: 0,
      allow_import_at_rule: true,
      balanced: Default::default(),
      is_next_rule_prelude: true,
      scan_context: ScanContext::TopLevel,
      selector_square_depth: 0,
      selector_fast_forward_enabled: false,
      property_kind: PropertyKind::Generic,
      in_animation_property: None,
      in_list_style_property: None,
      in_font_palette_property: None,
      in_container_property: None,
      in_grid_property: None,
      icss_symbols: Default::default(),
      icss_symbol_filter: [0; 16],
      icss_symbol_min_len: usize::MAX,
      icss_symbol_max_len: 0,
      pending_custom_property: None,
      pending_grid_property: None,
      handle_warning,
    }
  }

  pub fn dependency_context(&self) -> &DependencyContext<'s> {
    &self.dependency_context
  }

  pub fn into_dependency_context(self) -> DependencyContext<'s> {
    self.dependency_context
  }

  #[inline]
  fn set_scan_context(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    scan_context: ScanContext,
  ) {
    if self.scan_context == scan_context {
      return;
    }
    match self.scan_context {
      ScanContext::Selector => self.selector_square_depth = 0,
      ScanContext::AtRule => stream.reset_at_rule_scan_state(),
      ScanContext::SpecialValue(_) => stream.reset_special_value_scan_state(),
      _ => {}
    }
    self.scan_context = scan_context;
  }

  /// Drive dependency extraction from the forward token stream.
  pub fn lex_streaming(&mut self, source: &mut DependencyLexer<'s>) {
    self.selector_fast_forward_enabled = source.source_end() >= 256;
    let mode = self
      .mode_data
      .as_ref()
      .map_or(Mode::Css, ModeData::default_mode);
    let source_len = source.source_end() as usize;
    source
      .visitor_mut()
      .reserve(DependencyContext::estimated_dashed_ident_capacity(
        source_len, mode,
      ));
    self
      .dependency_context
      .reserve_estimated_capacity(source.source_end() as usize, mode);
    {
      let mut stream = TokenStream::from_lexer(source);
      let keep_comments = self.mode_data.as_ref().is_some_and(ModeData::is_pure_mode);
      let has_mode = self.mode_data.is_some();
      self.lex_streaming_inner(&mut stream, keep_comments, has_mode);
    }
    self
      .dependency_context
      .set_dashed_ident_occurrences(source.visitor_mut().take());
  }

  #[inline]
  fn update_dashed_ident_collection(&self, stream: &mut DependencyTokenStream<'_, 's>) {
    let enabled = self
      .mode_data
      .as_ref()
      .is_some_and(ModeData::is_current_local_mode);
    stream.lexer_mut().visitor_mut().set_enabled(enabled);
  }

  #[inline(always)]
  fn lex_streaming_inner(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    keep_comments: bool,
    has_mode: bool,
  ) {
    loop {
      self.update_dashed_ident_collection(stream);
      let item = stream.next(keep_comments);
      let token = item.token;
      if token.kind == TokenKind::Eof {
        return;
      }

      let is_trivia = matches!(token.kind, TokenKind::Comment | TokenKind::BadComment);
      if !is_trivia && self.scan_context == ScanContext::BlockItem {
        self.is_next_rule_prelude = !matches!(
          token.kind,
          TokenKind::Ident | TokenKind::Function | TokenKind::RightCurlyBracket
        );
        if self.is_next_rule_prelude
          && self.block_nesting_level == 0
          && let Some(mode_data) = &mut self.mode_data
        {
          mode_data.composes_local_classes.reset_to_initial();
        }
        let scan_context = if self.is_next_rule_prelude {
          ScanContext::Selector
        } else {
          ScanContext::DeclarationName
        };
        self.set_scan_context(stream, scan_context);
      }

      if self.scan_context == ScanContext::TopLevel
        && self.is_next_rule_prelude
        && token.kind != TokenKind::AtKeyword
      {
        self.set_scan_context(stream, ScanContext::Selector);
      }

      let mut colon_next = None;
      let mut dot_next = None;
      if has_mode
        && self.scan_context == ScanContext::Selector
        && token.kind == TokenKind::Colon
        && stream.lexer().could_start_ident_at(token.range.end)
      {
        let first = stream.peek_significant_skipping_comments(keep_comments);
        if first.token.kind != TokenKind::Eof {
          colon_next = Some(first);
        }
      } else if has_mode
        && self.scan_context == ScanContext::Selector
        && token.kind == TokenKind::Delim
        && stream.lexer().byte_at(token.range.start) == Some(b'.')
        && stream.lexer().could_start_ident_at(token.range.end)
      {
        let next = stream.peek_significant_skipping_comments(keep_comments);
        if next.token.kind != TokenKind::Eof {
          dot_next = Some(next);
        }
      }

      let mut result = Some(());
      match token.kind {
        TokenKind::Comment | TokenKind::BadComment => {
          result = self.handle_comment(stream.lexer_mut(), token.range.start, token.range.end);
        }
        TokenKind::WhiteSpace => {}
        TokenKind::QuotedString | TokenKind::BadString => {
          result = self.handle_string(
            stream.lexer_mut(),
            token.range.start,
            token.range.end,
            token.flags,
          );
        }
        TokenKind::Url => {
          result = self.handle_url(
            stream.lexer_mut(),
            token.range.start,
            token.range.end,
            token.value_range.start,
            token.value_range.end,
            token.flags,
          );
        }
        TokenKind::Function => {
          result = self.handle_function(stream, token.range.start, token.range.end, token.flags);
        }
        TokenKind::Ident => {
          result = self.handle_ident(stream, token.range.start, token.range.end, token.flags);
        }
        TokenKind::AtKeyword => {
          result = self.handle_at_keyword(stream, token.range.start, token.range.end, token.flags);
        }
        TokenKind::IdHash | TokenKind::Hash
          if !has_mode || self.scan_context != ScanContext::Selector => {}
        TokenKind::IdHash | TokenKind::Hash => {
          let id_end = if token.kind == TokenKind::Hash {
            token.range.start + 1
          } else {
            token.range.end
          };
          result = self.handle_id(stream.lexer_mut(), token.range.start, id_end, token.flags);
        }
        TokenKind::Delim
          if (!has_mode || self.scan_context != ScanContext::Selector)
            && stream.byte_at(token.range.start) == Some(b'#') => {}
        TokenKind::Delim if stream.byte_at(token.range.start) == Some(b'#') => {
          result = self.handle_id(
            stream.lexer_mut(),
            token.range.start,
            token.range.end,
            token.flags,
          );
        }
        TokenKind::Delim
          if (!has_mode || self.scan_context != ScanContext::Selector)
            && stream.byte_at(token.range.start) == Some(b'.') => {}
        TokenKind::Delim if stream.byte_at(token.range.start) == Some(b'.') => {
          let mut class_end = token.range.end;
          let mut class_flags = token.flags;
          let mut consumes_name = false;
          if let Some(next) = dot_next
            && next.token.kind == TokenKind::Ident
            && next.token.range.start == token.range.end
          {
            class_end = next.token.range.end;
            class_flags = next.token.flags;
            consumes_name = true;
          }
          result = self.handle_class(
            stream.lexer_mut(),
            token.range.start,
            class_end,
            class_flags,
          );
          if consumes_name {
            stream.next(keep_comments);
          }
        }
        TokenKind::Delim if self.scan_context == ScanContext::Selector => {
          if self.block_nesting_level == 0
            && let Some(mode_data) = &mut self.mode_data
          {
            mode_data.composes_local_classes.invalidate();
          }
        }
        TokenKind::Colon if self.scan_context == ScanContext::DeclarationName => {
          result = self.enter_property_value(stream);
        }
        TokenKind::Colon if !has_mode => {}
        TokenKind::Colon => {
          if let Some(next) = colon_next.filter(|next| {
            matches!(next.token.kind, TokenKind::Ident | TokenKind::Function)
              && next.token.range.start == token.range.end
          }) {
            let (end, function) = (next.token.range.end, next.token.kind == TokenKind::Function);
            stream.next(keep_comments);
            result = if function {
              self.handle_pseudo_function(stream, token.range.start, end, next.token.flags)
            } else {
              self.handle_pseudo_class(stream, token.range.start, end, next.token.flags)
            };
          }
        }
        TokenKind::LeftSquareBracket if self.scan_context == ScanContext::Selector => {
          self.selector_square_depth += 1;
          if self.block_nesting_level == 0
            && let Some(mode_data) = &mut self.mode_data
          {
            mode_data.composes_local_classes.invalidate();
          }
        }
        TokenKind::RightSquareBracket if self.scan_context == ScanContext::Selector => {
          self.selector_square_depth = self.selector_square_depth.saturating_sub(1);
        }
        TokenKind::LeftParenthesis => {
          result =
            self.handle_left_parenthesis(stream.lexer_mut(), token.range.start, token.range.end);
        }
        TokenKind::RightParenthesis => {
          result = self.handle_right_parenthesis(
            stream.lexer_mut(),
            item.leading.range.start,
            token.range.start,
            token.range.end,
          );
        }
        TokenKind::Comma => {
          result = self.handle_comma(stream.lexer_mut(), token.range.start, token.range.end);
        }
        TokenKind::Semicolon => {
          result = self.handle_semicolon(stream.lexer_mut(), token.range.start, token.range.end);
        }
        TokenKind::LeftCurlyBracket => {
          result = self.handle_left_curly_bracket(stream, token.range.start, token.range.end);
        }
        TokenKind::RightCurlyBracket => {
          result = self.handle_right_curly_bracket(stream, token.range.start, token.range.end);
        }
        _ => {}
      }

      if result.is_none() {
        return;
      }
      if token.kind == TokenKind::Semicolon {
        match self.scope {
          Scope::TopLevel => {
            self.set_scan_context(stream, ScanContext::TopLevel);
            self.is_next_rule_prelude = true;
          }
          Scope::InBlock => self.set_scan_context(stream, ScanContext::BlockItem),
          _ => {}
        }
      }
      self.update_dashed_ident_collection(stream);
      match self.scan_context {
        ScanContext::Selector if self.selector_fast_forward_enabled => {
          self.fast_forward_selector(stream, keep_comments, has_mode);
        }
        ScanContext::AtRule
          if !matches!(self.scope, Scope::InAtImport(_) | Scope::AtImportInvalid) =>
        {
          self.fast_forward_at_rule(stream, keep_comments);
        }
        ScanContext::SpecialValue(property) => {
          self.fast_forward_special_value(stream, property, keep_comments);
        }
        ScanContext::GenericValue if !is_trivia => {
          self.fast_forward_generic_value(stream, keep_comments);
        }
        _ => {}
      }
    }
  }

  #[inline]
  fn fast_forward_selector(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    keep_comments: bool,
    has_mode: bool,
  ) {
    let mut square_depth = self.selector_square_depth;
    let invalidates_composes = stream.fast_forward_selector_if_buffer_empty(
      &mut square_depth,
      keep_comments,
      has_mode,
      |ident| self.contains_icss_symbol(ident),
      is_css_modules_pure_magic_comment,
    );
    self.selector_square_depth = square_depth;
    if invalidates_composes
      && self.block_nesting_level == 0
      && let Some(mode_data) = &mut self.mode_data
    {
      mode_data.composes_local_classes.invalidate();
    }
  }

  #[inline]
  fn fast_forward_generic_value(
    &self,
    stream: &mut DependencyTokenStream<'_, 's>,
    keep_comments: bool,
  ) {
    let preserve_strings = matches!(
        self.balanced.last(),
        Some(last) if matches!(last.kind, BalancedItemKind::Url | BalancedItemKind::ImageSet)
    );
    let preserve_delimiters = !self.balanced.is_empty();
    if self.icss_symbols.is_empty() && !keep_comments {
      stream.fast_forward_generic_value_without_candidates_if_buffer_empty(
        preserve_strings,
        preserve_delimiters,
      );
    } else {
      stream.fast_forward_generic_value_if_buffer_empty(
        keep_comments,
        preserve_strings,
        preserve_delimiters,
        |ident| self.contains_icss_symbol(ident),
        is_css_modules_pure_magic_comment,
      );
    }
  }

  #[inline]
  fn fast_forward_at_rule(&self, stream: &mut DependencyTokenStream<'_, 's>, keep_comments: bool) {
    let preserve_strings = matches!(
        self.balanced.last(),
        Some(last) if matches!(last.kind, BalancedItemKind::Url | BalancedItemKind::ImageSet)
    );
    let preserve_delimiters = !self.balanced.is_empty();
    stream.fast_forward_at_rule_if_buffer_empty(
      keep_comments,
      preserve_strings,
      preserve_delimiters,
      |ident| self.contains_icss_symbol(ident),
      is_css_modules_pure_magic_comment,
    );
  }

  #[inline]
  fn fast_forward_special_value(
    &self,
    stream: &mut DependencyTokenStream<'_, 's>,
    property: PropertyKind,
    keep_comments: bool,
  ) {
    // An animation name may be any top-level identifier, so the raw
    // scanner usually stops immediately. Continue tokenizing directly.
    if property == PropertyKind::Animation {
      return;
    }
    let preserve_strings = property == PropertyKind::Grid
      || matches!(
          self.balanced.last(),
          Some(last) if matches!(last.kind, BalancedItemKind::Url | BalancedItemKind::ImageSet)
      );
    let preserve_delimiters = !self.balanced.is_empty();
    let icss_symbols = (!self.icss_symbols.is_empty()).then_some(&self.icss_symbols);
    stream.fast_forward_special_value_if_buffer_empty(
      keep_comments,
      preserve_strings,
      preserve_delimiters,
      property,
      icss_symbols,
    );
  }

  #[inline]
  fn icss_symbol_filter_bit(value: &str) -> (usize, u64) {
    let bytes = value.as_bytes();
    let len = bytes.len();
    let first = bytes.first().copied().unwrap_or_default() as usize;
    let middle = bytes.get(len / 2).copied().unwrap_or_default() as usize;
    let last = bytes.last().copied().unwrap_or_default() as usize;
    let mut hash = len.wrapping_mul(0x9e37_79b1);
    hash ^= first.wrapping_mul(0x85eb_ca6b);
    hash ^= middle.wrapping_mul(0xc2b2_ae35);
    hash ^= last.wrapping_mul(0x27d4_eb2f);
    hash ^= hash >> 16;
    let bit = hash & 1023;
    (bit >> 6, 1u64 << (bit & 63))
  }

  #[inline]
  fn contains_icss_symbol(&self, value: &str) -> bool {
    let len = value.len();
    if len < self.icss_symbol_min_len || len > self.icss_symbol_max_len {
      return false;
    }
    let (word, bit) = Self::icss_symbol_filter_bit(value);
    self.icss_symbol_filter[word] & bit != 0 && self.icss_symbols.contains(value)
  }

  fn insert_icss_symbol(&mut self, value: &'s str) {
    let len = value.len();
    self.icss_symbol_min_len = self.icss_symbol_min_len.min(len);
    self.icss_symbol_max_len = self.icss_symbol_max_len.max(len);
    let (word, bit) = Self::icss_symbol_filter_bit(value);
    self.icss_symbol_filter[word] |= bit;
    self.icss_symbols.insert(value);
  }

  fn enter_property_value(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    match self.property_kind {
      PropertyKind::Animation => self.enter_animation_property(),
      PropertyKind::ListStyle => self.enter_list_style_property(),
      PropertyKind::FontPalette => self.enter_font_palette_property(),
      PropertyKind::Container => self.enter_container_property(),
      PropertyKind::Grid => {
        if let Some(kind) = self.pending_grid_property.take() {
          self.enter_grid_property(kind);
        }
      }
      PropertyKind::CustomProperty => {
        if self
          .mode_data
          .as_ref()
          .is_some_and(ModeData::is_property_local_mode)
          && let Some(range) = self.pending_custom_property.take()
        {
          self
            .dependency_context
            .push_dependency(Dependency::LocalVarDecl {
              name: dashed_ident_name(stream.lexer().slice(range.start, range.end)?)?,
              range,
            });
        }
      }
      PropertyKind::Generic | PropertyKind::Composes => {}
    }
    self.pending_custom_property = None;
    self.pending_grid_property = None;
    self.set_scan_context(stream, ScanContext::for_property(self.property_kind));
    Some(())
  }

  fn classify_property(
    name: &str,
    flags: TokenFlags,
    property_local_mode: bool,
  ) -> (PropertyKind, Option<GridPropertyKind>) {
    if name.starts_with("--") {
      return if property_local_mode {
        (PropertyKind::CustomProperty, None)
      } else {
        (PropertyKind::Generic, None)
      };
    }
    let mut normalized = [0; MAX_CSS_KEYWORD_LEN];
    let name = if flags.has_escape() {
      let Some(name) = decode_css_keyword(name, &mut normalized) else {
        return (PropertyKind::Generic, None);
      };
      name
    } else {
      let Some(name) = lowercase_ascii_keyword(name, &mut normalized) else {
        return (PropertyKind::Generic, None);
      };
      name
    };
    if matches!(name, "composes" | "compose-with") {
      return (PropertyKind::Composes, None);
    }
    if !property_local_mode {
      return (PropertyKind::Generic, None);
    }
    let unprefixed = strip_vendor_prefix(name).unwrap_or(name);
    if matches!(unprefixed, "animation" | "animation-name") {
      return (PropertyKind::Animation, None);
    }
    if matches!(name, "list-style" | "list-style-type") {
      return (PropertyKind::ListStyle, None);
    }
    if name == "font-palette" {
      return (PropertyKind::FontPalette, None);
    }
    if matches!(name, "container" | "container-name") {
      return (PropertyKind::Container, None);
    }
    if let Some(grid) = grid_property_kind(name) {
      return (PropertyKind::Grid, Some(grid));
    }
    (PropertyKind::Generic, None)
  }

  fn classify_at_rule(name: &str, flags: TokenFlags) -> AtRuleKind {
    let mut normalized = [0; MAX_CSS_KEYWORD_LEN];
    let name = if flags.has_escape() {
      let Some(name) = decode_css_keyword(name, &mut normalized) else {
        return AtRuleKind::Other;
      };
      name
    } else {
      let Some(name) = lowercase_ascii_keyword(name, &mut normalized) else {
        return AtRuleKind::Other;
      };
      name
    };
    match name {
      "@value" => AtRuleKind::Value,
      "@scope" => AtRuleKind::Scope,
      "@import" => AtRuleKind::Import,
      "@charset" => AtRuleKind::Charset,
      "@function" => AtRuleKind::Function,
      "@property" => AtRuleKind::Property,
      "@namespace" => AtRuleKind::Namespace,
      "@keyframes" => AtRuleKind::Keyframes,
      "@container" => AtRuleKind::Container,
      "@counter-style" => AtRuleKind::CounterStyle,
      "@font-palette-values" => AtRuleKind::FontPaletteValues,
      _ if name.strip_prefix('@').and_then(strip_vendor_prefix) == Some("keyframes") => {
        AtRuleKind::Keyframes
      }
      _ => AtRuleKind::Other,
    }
  }

  fn get_media(&self, lexer: &DependencyLexer<'s>, start: Pos, end: Pos) -> Option<&'s str> {
    let media = lexer.slice(start, end)?;
    let bytes = media.as_bytes();
    let mut position = 0;
    loop {
      while position < bytes.len() && bytes[position].is_ascii_whitespace() {
        position += 1;
      }
      if position + 1 < bytes.len() && bytes[position] == b'/' && bytes[position + 1] == b'*' {
        let Some(relative_end) = media[position + 2..].find("*/") else {
          break;
        };
        position += relative_end + 4;
        continue;
      }
      break;
    }
    if position == bytes.len() {
      return None;
    }
    Some(media)
  }

  fn lex_charset_at_rule(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
  ) -> Option<()> {
    let string = stream.next_parser_token().token;
    if string.kind != TokenKind::QuotedString {
      return Some(());
    }

    let next = stream.next_parser_token().token;
    if next.kind == TokenKind::Semicolon {
      self
        .dependency_context
        .push_dependency(Dependency::Charset {
          value: stream.slice(string.value_range.start, string.value_range.end)?,
          range: Range::new(start, next.range.end),
        });
    }
    Some(())
  }

  fn enter_animation_property(&mut self) {
    self.in_animation_property = Some(InProperty::new(
      AnimationReserved::default(),
      self.balanced.len(),
    ));
  }

  fn exit_animation_property(&mut self) {
    self.in_animation_property = None;
  }

  fn enter_list_style_property(&mut self) {
    self.in_list_style_property = Some(InProperty::new(ListStyleReserved, self.balanced.len()));
  }

  fn exit_list_style_property(&mut self) {
    self.in_list_style_property = None;
  }

  fn enter_font_palette_property(&mut self) {
    self.in_font_palette_property = Some(InProperty::new(FontPaletteReserved, self.balanced.len()));
  }

  fn exit_font_palette_property(&mut self) {
    self.in_font_palette_property = None;
  }

  fn enter_container_property(&mut self) {
    self.in_container_property = Some(InProperty::new(ContainerReserved, self.balanced.len()));
  }

  fn exit_container_property(&mut self) {
    self.in_container_property = None;
  }

  fn enter_grid_property(&mut self, kind: GridPropertyKind) {
    self.in_grid_property = Some(kind);
  }

  fn exit_grid_property(&mut self) {
    self.in_grid_property = None;
  }

  fn lex_icss_import(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    let (start, end) = self.consume_icss_import_path(stream)?;
    let right_parenthesis = stream.next_parser_token().token;
    if right_parenthesis.kind != TokenKind::RightParenthesis {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected ')' during parsing of ':import()'",
        },
      });
      return Some(());
    }
    self
      .dependency_context
      .push_dependency(Dependency::ICSSImportFrom {
        path: stream.slice(start, end)?,
      });
    let left_curly = stream.next_parser_token().token;
    if left_curly.kind != TokenKind::LeftCurlyBracket {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(left_curly.range.start, left_curly.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected '{' during parsing of ':import()'",
        },
      });
      return Some(());
    }
    loop {
      let first = stream.next_parser_token().token;
      if first.kind == TokenKind::Eof {
        return None;
      }
      if first.kind == TokenKind::RightCurlyBracket {
        break;
      }
      let prop_start = first.range.start;
      let prop_end = self.consume_icss_export_prop(stream, first)?;
      let colon = stream.peek_significant_skipping_comments(true).token;
      if colon.kind != TokenKind::Colon {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(colon.range.start, colon.range.end),
          kind: WarningKind::Unexpected {
            message: "Expected ':' during parsing of ':import'",
          },
        });
        return Some(());
      }
      stream.next_parser_token();
      let value_start_token = stream.next_parser_token().token;
      if value_start_token.kind == TokenKind::Eof {
        return None;
      }
      let value_start = value_start_token.range.start;
      let value_end = self.consume_icss_value(stream, value_start_token)?;
      let delimiter = stream.next_parser_token().token;
      self
        .dependency_context
        .push_dependency(Dependency::ICSSImportValue {
          prop: stream
            .slice(prop_start, prop_end)?
            .trim_end_matches(is_css_white_space_char),
          value: stream
            .slice(value_start, value_end)?
            .trim_end_matches(is_css_white_space_char),
        });
      self.insert_icss_symbol(
        stream
          .slice(prop_start, prop_end)?
          .trim_end_matches(is_css_white_space_char),
      );
      if delimiter.kind == TokenKind::RightCurlyBracket {
        break;
      }
    }
    Some(())
  }

  fn consume_icss_import_path(
    &self,
    stream: &mut DependencyTokenStream<'_, 's>,
  ) -> Option<(Pos, Pos)> {
    let first = stream.next_parser_token().token;
    if first.kind == TokenKind::Eof {
      return None;
    }
    let start = first.range.start;
    let mut end = start;
    if first.kind == TokenKind::RightParenthesis {
      return Some((start, end));
    }
    end = first.range.end;
    loop {
      let token = stream.peek_significant_skipping_comments(true).token;
      if token.kind == TokenKind::Eof {
        return None;
      }
      if token.kind == TokenKind::RightParenthesis {
        return Some((start, end));
      }
      stream.next_parser_token();
      if first.kind != TokenKind::QuotedString {
        end = token.range.end;
      }
    }
  }

  fn consume_icss_export_prop(
    &self,
    stream: &mut DependencyTokenStream<'_, 's>,
    first: Token,
  ) -> Option<Pos> {
    if matches!(
      first.kind,
      TokenKind::Colon | TokenKind::RightCurlyBracket | TokenKind::Semicolon
    ) {
      return Some(first.range.start);
    }
    loop {
      let token = stream.peek_parser_token();
      if token.token.kind == TokenKind::Eof {
        return None;
      }
      if let Some(first_comment_start) = token.leading.first_comment_start {
        return Some(first_comment_start);
      }
      if matches!(
        token.token.kind,
        TokenKind::Colon | TokenKind::RightCurlyBracket | TokenKind::Semicolon
      ) {
        return Some(token.token.range.start);
      }
      stream.next_parser_token();
    }
  }

  fn consume_icss_value(
    &self,
    stream: &mut DependencyTokenStream<'_, 's>,
    first: Token,
  ) -> Option<Pos> {
    if matches!(
      first.kind,
      TokenKind::RightCurlyBracket | TokenKind::Semicolon
    ) {
      return Some(first.range.start);
    }
    loop {
      let token = stream.peek(true).token;
      if token.kind == TokenKind::Eof {
        return None;
      }
      if matches!(
        token.kind,
        TokenKind::RightCurlyBracket | TokenKind::Semicolon
      ) {
        return Some(token.range.start);
      }
      stream.next(true);
    }
  }

  fn lex_value_at_rule(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
  ) -> Option<()> {
    let input = stream.slice_trusted(0, stream.source_end());
    let checkpoint = self
      .dependency_context
      .value_at_rule_import_items_checkpoint();
    let mut parser = ValueAtRuleStream::new(input);
    loop {
      let token = stream.next_parser_token().token;
      match token.kind {
        TokenKind::Eof => return None,
        _ => {
          if token.kind == TokenKind::Semicolon && parser.depth == 0 {
            parser.params_end = token.range.start;
            break;
          }
          let depth_after = (parser.depth + u32::from(is_open_token(token.kind)))
            .saturating_sub(u32::from(is_close_token(token.kind)));
          if token.kind == TokenKind::RightCurlyBracket && depth_after == 0 {
            parser.params_end = token.range.start;
            break;
          }
          parser.push(&mut self.dependency_context, token);
        }
      }
    }
    let at_rule_end = parser.params_end.max(stream.consumed_pos());
    let import = parser.last_two().is_some_and(|(penultimate, last)| {
      penultimate.kind == TokenKind::Ident
        && parser
          .input
          .get(penultimate.range.start as usize..penultimate.range.end as usize)
          .is_some_and(|text| text.eq_ignore_ascii_case("from"))
        && parser.from_pos == Some(penultimate.range.start)
        && parser
          .input
          .get(penultimate.range.end as usize..last.range.start as usize)
          .is_some_and(trivia_only)
    });
    if import {
      let (_, last) = parser
        .last_two()
        .expect("an import value must end with at least two tokens");
      let from = &parser.input[last.range.start as usize..last.range.end as usize];
      let item_end = parser.from_prev_end.unwrap_or(parser.item_end);
      parser.finish_item(&mut self.dependency_context, item_end);
      let items = self
        .dependency_context
        .finish_value_at_rule_import_items(checkpoint);
      if items.is_empty() {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(start, at_rule_end),
          kind: WarningKind::Unexpected {
            message: "Broken '@value' at-rule",
          },
        });
      } else {
        self
          .dependency_context
          .push_dependency(Dependency::ICSSImportFrom { path: from });
        for index in items.as_usize_range() {
          let item = self.dependency_context.value_at_rule_import_item(index);
          self
            .dependency_context
            .push_dependency(Dependency::ICSSImportValue {
              prop: item.local_name(),
              value: item.import_name(),
            });
          self.insert_icss_symbol(item.local_name());
          self
            .dependency_context
            .push_dependency(Dependency::ICSSExportValue {
              prop: item.local_name(),
              value: item.local_name(),
            });
        }
      }
    } else {
      self
        .dependency_context
        .truncate_value_at_rule_import_items(checkpoint);
      let local_name;
      let value;
      let has_colon;
      if let Some(colon) = parser.first_colon {
        local_name = &parser.input[parser
          .first_significant
          .unwrap_or((colon.split, colon.split))
          .0 as usize..colon.prev_end as usize];
        let raw = &parser.input[colon.end as usize..parser.params_end as usize];
        value = if parser.first_colon_tokens_after > 0 {
          trim_css_whitespace(raw)
        } else {
          raw
        };
        has_colon = true;
      } else if let Some((first_start, first_end)) = parser.first_significant {
        local_name = &parser.input[first_start as usize..first_end as usize];
        let raw = &parser.input[first_end as usize..parser.params_end as usize];
        value = if parser.significant_count > 1 {
          trim_css_whitespace(raw)
        } else {
          raw
        };
        has_colon = false;
      } else {
        local_name = "";
        value = "";
        has_colon = false;
      }
      if local_name.is_empty() || (!has_colon && value.is_empty()) {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(start, at_rule_end),
          kind: WarningKind::Unexpected {
            message: "Broken '@value' at-rule",
          },
        });
      }
      if !local_name.is_empty() {
        self
          .dependency_context
          .push_dependency(Dependency::ICSSExportValue {
            prop: local_name,
            value,
          });
        self.insert_icss_symbol(local_name);
      }
    }
    self
      .dependency_context
      .push_dependency(Dependency::Replace {
        content: "",
        range: Range::new(start, at_rule_end),
      });
    Some(())
  }

  fn lex_icss_export(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    let left_curly = stream.next_parser_token().token;
    if left_curly.kind != TokenKind::LeftCurlyBracket {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(left_curly.range.start, left_curly.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected '{' during parsing of ':export'",
        },
      });
      return Some(());
    }
    loop {
      let first = stream.next_parser_token().token;
      if first.kind == TokenKind::Eof {
        return None;
      }
      if first.kind == TokenKind::RightCurlyBracket {
        break;
      }
      let prop_start = first.range.start;
      let prop_end = self.consume_icss_export_prop(stream, first)?;
      let colon = stream.peek_significant_skipping_comments(true).token;
      if colon.kind != TokenKind::Colon {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(colon.range.start, colon.range.end),
          kind: WarningKind::Unexpected {
            message: "Expected ':' during parsing of ':export'",
          },
        });
        return Some(());
      }
      stream.next_parser_token();
      let value_start_token = stream.next_parser_token().token;
      if value_start_token.kind == TokenKind::Eof {
        return None;
      }
      let value_start = value_start_token.range.start;
      let value_end = self.consume_icss_value(stream, value_start_token)?;
      let delimiter = stream.next_parser_token().token;
      let value = stream
        .slice(value_start, value_end)?
        .trim_end_matches(is_css_white_space_char);
      self
        .dependency_context
        .push_dependency(Dependency::ICSSExportValue {
          prop: stream
            .slice(prop_start, prop_end)?
            .trim_end_matches(is_css_white_space_char),
          value,
        });
      self.insert_icss_symbol(
        stream
          .slice(prop_start, prop_end)?
          .trim_end_matches(is_css_white_space_char),
      );
      if delimiter.kind == TokenKind::RightCurlyBracket {
        break;
      }
    }
    Some(())
  }

  fn lex_local_var(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    let name_token = stream.next_parser_token().token;
    let start = name_token.range.start;
    let raw_name = stream.slice(start, name_token.range.end)?;
    let name = if name_token.kind == TokenKind::Ident {
      dashed_ident_name(raw_name)
    } else {
      None
    };
    let Some(name) = name else {
      self.handle_warning.handle_warning(Warning {
        kind: WarningKind::Unexpected {
          message: "Expected starts with '--' during parsing of 'var()'",
        },
        range: Range::new(start, (start + 2).min(name_token.range.end)),
      });
      return Some(());
    };
    let end = name_token.range.end;
    let next = stream.peek_significant_skipping_comments(true).token;
    let (from, from_is_global) = if next.kind == TokenKind::Ident
      && is_ascii_keyword(stream.slice(next.range.start, next.range.end)?, "from")
    {
      stream.next_parser_token();
      let path_token = stream.peek_significant_skipping_comments(true).token;
      let path_start = path_token.range.start;
      let path_end = path_token.range.end;
      if !matches!(path_token.kind, TokenKind::QuotedString | TokenKind::Ident) {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(path_start, path_end),
          kind: WarningKind::Unexpected {
            message: "Expected string or ident during parsing of 'var()'",
          },
        });
        return Some(());
      }
      stream.next_parser_token();
      let path = stream.slice(path_start, path_end)?;
      (
        Some(path),
        path_token.kind == TokenKind::Ident && path == "global",
      )
    } else {
      (None, false)
    };
    if from_is_global {
      let name_start = dashed_ident_name_start(raw_name)?;
      stream
        .lexer_mut()
        .visitor_mut()
        .discard_last(Range::new(start + name_start as Pos, end));
    }
    self
      .dependency_context
      .push_dependency(Dependency::LocalVar {
        name,
        range: Range::new(start, end),
        from,
        from_is_global,
      });
    Some(())
  }

  fn lex_local_dashed_ident_decl(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    local_decl_dependency: impl FnOnce(&'s str, Range) -> Dependency<'s>,
    dashed_warning: impl FnOnce(Range) -> Warning<'s>,
    left_curly_warning: impl FnOnce(Range) -> Warning<'s>,
  ) -> Option<()> {
    let name_token = stream.next_parser_token().token;
    let start = name_token.range.start;
    if name_token.kind != TokenKind::Ident
      || !stream.slice(start, name_token.range.end)?.starts_with("--")
    {
      self
        .handle_warning
        .handle_warning(dashed_warning(Range::new(
          start,
          (start + 2).min(name_token.range.end),
        )));
      return Some(());
    }
    let end = name_token.range.end;
    self
      .dependency_context
      .push_dependency(local_decl_dependency(
        dashed_ident_name(stream.slice(start, end)?)?,
        Range::new(start, end),
      ));
    let left_curly = stream.peek_significant_skipping_comments(true).token;
    if left_curly.kind != TokenKind::LeftCurlyBracket {
      self
        .handle_warning
        .handle_warning(left_curly_warning(Range::new(
          left_curly.range.start,
          left_curly.range.end,
        )));
      return Some(());
    }
    Some(())
  }

  fn lex_local_keyframes_decl(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    let mut is_function = false;
    let first = stream.next_parser_token().token;
    let name_token = if first.kind == TokenKind::Colon {
      let pseudo_start = first.range.start;
      let pseudo_name = stream.next_parser_token().token;
      let pseudo_end = if matches!(pseudo_name.kind, TokenKind::Ident | TokenKind::Function) {
        pseudo_name.range.end
      } else {
        first.range.end
      };
      let pseudo = stream.slice(pseudo_start, pseudo_end)?;
      if pseudo_name.kind == TokenKind::Function {
        self.handle_pseudo_function(stream, pseudo_start, pseudo_end, pseudo_name.flags)?;
      } else if pseudo_name.kind == TokenKind::Ident {
        self.handle_pseudo_class(stream, pseudo_start, pseudo_end, pseudo_name.flags)?;
      }
      let mode_data = self
        .mode_data
        .as_ref()
        .expect("CSS Modules mode data must exist while parsing keyframes");
      if mode_data.is_pure_mode()
        && !mode_data.is_pure_check_disabled()
        && (pseudo.eq_ignore_ascii_case(":global(") || pseudo.eq_ignore_ascii_case(":global"))
      {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(pseudo_start, pseudo_end),
          kind: WarningKind::NotPure {
            message: "'@keyframes :global' is not allowed in pure mode",
          },
        });
      }
      is_function =
        pseudo.eq_ignore_ascii_case(":local(") || pseudo.eq_ignore_ascii_case(":global(");
      if !is_function
        && !pseudo.eq_ignore_ascii_case(":local")
        && !pseudo.eq_ignore_ascii_case(":global")
      {
        self.handle_warning.handle_warning(Warning {
                    range: Range::new(pseudo_start, pseudo_end),
                    kind: WarningKind::Unexpected {
                        message: "Expected ':local', ':local()', ':global', or ':global()' during parsing of '@keyframes' name",
                    }
                });
        return Some(());
      }
      stream.next_parser_token().token
    } else {
      first
    };

    let start = name_token.range.start;
    if name_token.kind != TokenKind::Ident {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, start.saturating_add(2).min(stream.source_end())),
        kind: WarningKind::Unexpected {
          message: "Expected ident during parsing of '@keyframes' name",
        },
      });
      return Some(());
    }
    let end = name_token.range.end;
    if self
      .mode_data
      .as_ref()
      .expect("CSS Modules mode data must exist while parsing keyframes")
      .is_current_local_mode()
    {
      let name = stream.slice(start, end)?;
      self
        .dependency_context
        .push_dependency(Dependency::LocalKeyframesDecl {
          name,
          range: Range::new(start, end),
        });
    }
    if is_function {
      let right_parenthesis = stream.peek_significant_skipping_comments(true).token;
      if right_parenthesis.kind != TokenKind::RightParenthesis {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
          kind: WarningKind::Unexpected {
            message: "Expected ')' during parsing of '@keyframes :local(' or '@keyframes :global('",
          },
        });
        return Some(());
      }
      stream.next_parser_token();
      self
        .dependency_context
        .push_dependency(Dependency::Replace {
          content: "",
          range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
        });
      let mode_data = self
        .mode_data
        .as_mut()
        .expect("CSS Modules mode data must exist while leaving a keyframes mode function");
      mode_data.inside_mode_function -= 1;
      self.balanced.pop_without_moda_data();
    }
    let left_curly = stream.peek_significant_skipping_comments(true).token;
    if left_curly.kind != TokenKind::LeftCurlyBracket {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(left_curly.range.start, left_curly.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected '{' during parsing of '@keyframes'",
        },
      });
      return Some(());
    }
    Some(())
  }

  fn handle_local_keyframes_dependency(&mut self, lexer: &DependencyLexer<'s>) -> Option<()> {
    let animation = self
      .in_animation_property
      .as_mut()
      .expect("animation state must exist while handling an animation dependency");
    if let Some(range) = animation.take_rename(self.balanced.len()) {
      self
        .dependency_context
        .push_dependency(Dependency::LocalKeyframes {
          name: lexer.slice(range.start, range.end)?,
          range,
        });
    }
    animation.reset_reserved();
    Some(())
  }

  fn lex_local_counter_style_decl(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
  ) -> Option<()> {
    let name_token = stream.next_parser_token().token;
    let start = name_token.range.start;
    if name_token.kind != TokenKind::Ident {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, name_token.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected ident during parsing of '@counter-style'",
        },
      });
      return Some(());
    }
    let end = name_token.range.end;
    self
      .dependency_context
      .push_dependency(Dependency::LocalCounterStyleDecl {
        name: stream.slice(start, end)?,
        range: Range::new(start, end),
      });
    let left_curly = stream.peek_significant_skipping_comments(true).token;
    if left_curly.kind != TokenKind::LeftCurlyBracket {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(left_curly.range.start, left_curly.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected '{' during parsing of '@counter-style'",
        },
      });
      return Some(());
    }
    Some(())
  }

  fn lex_local_container_at_rule(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
  ) -> Option<()> {
    let name_token = stream.next_parser_token().token;
    if name_token.kind == TokenKind::LeftParenthesis {
      return Some(());
    }
    if name_token.kind != TokenKind::Ident {
      return Some(());
    }
    let start = name_token.range.start;
    let end = name_token.range.end;
    let ident = stream.slice(start, end)?;
    if is_reserved_container_query_ident(ident, name_token.flags) {
      return Some(());
    }
    if self
      .mode_data
      .as_ref()
      .expect("CSS Modules mode data must exist while parsing a container")
      .is_current_local_mode()
    {
      self
        .dependency_context
        .push_dependency(Dependency::LocalContainer {
          name: ident,
          range: Range::new(start, end),
        });
    }
    Some(())
  }

  fn lex_local_function_decl(&mut self, stream: &mut DependencyTokenStream<'_, 's>) -> Option<()> {
    let mut is_function = false;
    let first = stream.next_parser_token().token;
    let name_token = if first.kind == TokenKind::Colon {
      let pseudo_start = first.range.start;
      let pseudo_name = stream.next_parser_token().token;
      let pseudo_end = if matches!(pseudo_name.kind, TokenKind::Ident | TokenKind::Function) {
        pseudo_name.range.end
      } else {
        first.range.end
      };
      let pseudo = stream.slice(pseudo_start, pseudo_end)?;
      if pseudo_name.kind == TokenKind::Function {
        self.handle_pseudo_function(stream, pseudo_start, pseudo_end, pseudo_name.flags)?;
      } else if pseudo_name.kind == TokenKind::Ident {
        self.handle_pseudo_class(stream, pseudo_start, pseudo_end, pseudo_name.flags)?;
      }
      let mode_data = self
        .mode_data
        .as_ref()
        .expect("CSS Modules mode data must exist while parsing a function");
      if mode_data.is_pure_mode()
        && !mode_data.is_pure_check_disabled()
        && (pseudo.eq_ignore_ascii_case(":global(") || pseudo.eq_ignore_ascii_case(":global"))
      {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(pseudo_start, pseudo_end),
          kind: WarningKind::NotPure {
            message: "'@function :global' is not allowed in pure mode",
          },
        });
      }
      is_function =
        pseudo.eq_ignore_ascii_case(":local(") || pseudo.eq_ignore_ascii_case(":global(");
      if !is_function
        && !pseudo.eq_ignore_ascii_case(":local")
        && !pseudo.eq_ignore_ascii_case(":global")
      {
        self.handle_warning.handle_warning(Warning {
                    range: Range::new(pseudo_start, pseudo_end),
                    kind: WarningKind::Unexpected {
                        message:
                            "Expected ':local', ':local()', ':global', or ':global()' during parsing of '@function' name",
                    },
                });
        return Some(());
      }
      stream.next_parser_token().token
    } else {
      first
    };

    let name_range = if name_token.kind == TokenKind::Function {
      name_token.value_range
    } else {
      name_token.range
    };
    let start = name_range.start;
    let end = name_range.end;
    let name = stream.slice_trusted(start, end);
    if name_token.kind != TokenKind::Ident && name_token.kind != TokenKind::Function
      || !name.starts_with("--")
    {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, start.saturating_add(2).min(stream.source_end())),
        kind: WarningKind::Unexpected {
          message: "Expected starts with '--' during parsing of '@function' name",
        },
      });
      return Some(());
    }
    if self
      .mode_data
      .as_ref()
      .expect("CSS Modules mode data must exist while parsing a function")
      .is_current_local_mode()
    {
      self
        .dependency_context
        .push_dependency(Dependency::LocalFunctionDecl {
          name: dashed_ident_name(stream.slice(start, end)?)?,
          range: Range::new(start, end),
        });
    }

    if is_function {
      let right_parenthesis = stream.peek_significant_skipping_comments(true).token;
      if right_parenthesis.kind != TokenKind::RightParenthesis {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
          kind: WarningKind::Unexpected {
            message: "Expected ')' during parsing of '@function :local(' or '@function :global('",
          },
        });
        return Some(());
      }
      stream.next_parser_token();
      self
        .dependency_context
        .push_dependency(Dependency::Replace {
          content: "",
          range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
        });
      let mode_data = self
        .mode_data
        .as_mut()
        .expect("CSS Modules mode data must exist while leaving a function mode function");
      mode_data.inside_mode_function -= 1;
      self.balanced.pop_without_moda_data();
    }

    if name_token.kind == TokenKind::Function {
      return Some(());
    }
    let left_parenthesis = stream.peek_significant_skipping_comments(true).token;
    if left_parenthesis.kind != TokenKind::LeftParenthesis {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(left_parenthesis.range.start, left_parenthesis.range.end),
        kind: WarningKind::Unexpected {
          message: "Expected '(' during parsing of '@function'",
        },
      });
    }
    Some(())
  }

  fn handle_local_counter_style_dependency(&mut self, lexer: &DependencyLexer<'s>) -> Option<()> {
    let list_style = self
      .in_list_style_property
      .as_mut()
      .expect("list-style state must exist while handling a counter-style dependency");
    if let Some(range) = list_style.take_rename(self.balanced.len()) {
      self
        .dependency_context
        .push_dependency(Dependency::LocalCounterStyle {
          name: lexer.slice(range.start, range.end)?,
          range,
        });
    }
    Some(())
  }

  fn handle_local_font_palette_dependency(&mut self, lexer: &DependencyLexer<'s>) -> Option<()> {
    let font_palette = self
      .in_font_palette_property
      .as_mut()
      .expect("font-palette state must exist while handling a font-palette dependency");
    if let Some(range) = font_palette.take_rename(self.balanced.len()) {
      self
        .dependency_context
        .push_dependency(Dependency::LocalFontPalette {
          name: dashed_ident_name(lexer.slice(range.start, range.end)?)?,
          range,
        });
    }
    Some(())
  }

  fn lex_composes(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    local_classes: SmallVec<[&'s str; 2]>,
    start: Pos,
  ) -> Option<()> {
    let colon = stream.peek_significant_skipping_comments(true).token;
    if colon.kind != TokenKind::Colon {
      return Some(());
    }
    stream.next_parser_token();
    let mut replacement_end = colon.range.end;
    loop {
      let first = stream.peek_significant_skipping_comments(true).token;
      if first.kind == TokenKind::Eof {
        break;
      }
      if first.kind == TokenKind::RightCurlyBracket {
        break;
      }
      if first.kind == TokenKind::Semicolon {
        stream.next_parser_token();
        replacement_end = first.range.end;
        break;
      }

      let item_start = first.range.start;
      let mut item_end = item_start;
      let mut names: SmallVec<[&'s str; 2]> = SmallVec::new();
      let mut has_from = false;
      let mut delimiter = first;
      loop {
        if matches!(
          delimiter.kind,
          TokenKind::Comma | TokenKind::Semicolon | TokenKind::RightCurlyBracket
        ) {
          break;
        }

        if delimiter.kind == TokenKind::Function
          && stream.slice(delimiter.range.start, delimiter.range.end)? == "global("
        {
          let global_start = delimiter.range.start;
          stream.next_parser_token();
          let name_token = stream.next_parser_token().token;
          let Some(name_range) = ident_like_range(name_token) else {
            self.handle_warning.handle_warning(Warning {
              range: Range::new(
                name_token.range.start,
                name_token
                  .range
                  .start
                  .saturating_add(2)
                  .min(stream.source_end()),
              ),
              kind: WarningKind::Unexpected {
                message: "Expected ident during parsing of 'composes'",
              },
            });
            return Some(());
          };
          let right_parenthesis = stream.peek_significant_skipping_comments(true).token;
          if right_parenthesis.kind != TokenKind::RightParenthesis {
            self.handle_warning.handle_warning(Warning {
              range: Range::new(right_parenthesis.range.start, right_parenthesis.range.end),
              kind: WarningKind::Unexpected {
                message: "Expected ')' during parsing of 'composes'",
              },
            });
            return Some(());
          }
          stream.next_parser_token();
          item_end = right_parenthesis.range.end;
          self.dependency_context.push_composes(
            local_classes.iter().copied(),
            std::iter::once(stream.slice(name_range.start, name_range.end)?),
            Some("global"),
            true,
            Range::new(global_start, item_end),
          );
          delimiter = stream.peek_significant_skipping_comments(true).token;
          continue;
        }

        let Some(name_range) = ident_like_range(delimiter) else {
          let name_start = delimiter.range.start;
          self.handle_warning.handle_warning(Warning {
            range: Range::new(
              name_start,
              name_start.saturating_add(2).min(stream.source_end()),
            ),
            kind: WarningKind::Unexpected {
              message: "Expected ident during parsing of 'composes'",
            },
          });
          return Some(());
        };
        let ident = stream.slice(name_range.start, name_range.end)?;
        if !names.is_empty() && ident.eq_ignore_ascii_case("from") {
          stream.next_parser_token();
          let path = stream.peek_significant_skipping_comments(true).token;
          if matches!(
            path.kind,
            TokenKind::QuotedString | TokenKind::Ident | TokenKind::Function
          ) {
            let path_range = if path.kind == TokenKind::Function {
              path.value_range
            } else {
              path.range
            };
            item_end = path_range.end;
            let from_is_global = path.kind == TokenKind::Ident
              && is_ascii_keyword(stream.slice(path_range.start, path_range.end)?, "global");
            self.dependency_context.push_composes(
              local_classes.iter().copied(),
              std::mem::take(&mut names),
              Some(stream.slice(path_range.start, path_range.end)?),
              from_is_global,
              Range::new(item_start, item_end),
            );
            has_from = true;
            stream.next_parser_token();
            delimiter = stream.peek_significant_skipping_comments(true).token;
            break;
          }
          names.push(ident);
          item_end = name_range.end;
          delimiter = path;
          continue;
        }
        names.push(ident);
        item_end = name_range.end;
        stream.next_parser_token();
        delimiter = stream.peek_significant_skipping_comments(true).token;
      }

      if has_from {
        if delimiter.kind == TokenKind::Comma {
          stream.next_parser_token();
          replacement_end = delimiter.range.end;
          continue;
        }
        if delimiter.kind == TokenKind::Semicolon {
          stream.next_parser_token();
          replacement_end = delimiter.range.end;
          break;
        }
        if delimiter.kind == TokenKind::RightCurlyBracket {
          replacement_end = item_end;
          break;
        }
        replacement_end = item_end;
        break;
      }

      if delimiter.kind == TokenKind::Comma {
        if !names.is_empty() {
          self.dependency_context.push_composes(
            local_classes.iter().copied(),
            names,
            None,
            false,
            Range::new(item_start, item_end),
          );
        }
        stream.next_parser_token();
        replacement_end = delimiter.range.end;
        continue;
      }

      if delimiter.kind == TokenKind::Semicolon {
        if !names.is_empty() {
          self.dependency_context.push_composes(
            local_classes.iter().copied(),
            names,
            None,
            false,
            Range::new(item_start, item_end),
          );
        }
        stream.next_parser_token();
        replacement_end = delimiter.range.end;
        break;
      }

      if delimiter.kind == TokenKind::RightCurlyBracket {
        if !names.is_empty() {
          self.dependency_context.push_composes(
            local_classes.iter().copied(),
            names,
            None,
            false,
            Range::new(item_start, item_end),
          );
        }
        replacement_end = item_end;
        break;
      }

      // An invalid token was encountered after a name.  The next loop
      // iteration would produce the same warning, but keeping the
      // cursor at that token preserves the legacy recovery point.
      self.handle_warning.handle_warning(Warning {
        range: Range::new(
          delimiter.range.start,
          delimiter
            .range
            .start
            .saturating_add(2)
            .min(stream.source_end()),
        ),
        kind: WarningKind::Unexpected {
          message: "Expected ident during parsing of 'composes'",
        },
      });
      return Some(());
    }
    self
      .dependency_context
      .push_dependency(Dependency::Replace {
        content: "",
        range: Range::new(start, replacement_end),
      });
    Some(())
  }
}

impl<'s, W: HandleWarning<'s>> LexDependencies<'s, W> {
  fn handle_comment(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
  ) -> Option<()> {
    let Some(mode_data) = &mut self.mode_data else {
      return Some(());
    };
    if !mode_data.is_pure_mode() || end < start + 4 {
      return Some(());
    }

    let content = lexer.slice(start + 2, end - 2)?;
    if is_css_modules_magic_comment(content, "cssmodules-pure-ignore") {
      mode_data.mark_pure_ignore();
    } else if matches!(self.scope, Scope::TopLevel)
      && self.block_nesting_level == 0
      && is_css_modules_magic_comment(content, "cssmodules-pure-no-check")
    {
      mode_data.mark_pure_no_check();
    }
    Some(())
  }

  fn handle_url(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
    content_start: Pos,
    content_end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let value = lexer.slice(content_start, content_end)?;
    match self.scope {
      Scope::InAtImport(ref mut import_data) => {
        if import_data.in_supports() {
          return Some(());
        }
        if import_data.url.is_some() {
          self.handle_warning.handle_warning(Warning {
            range: Range::new(import_data.start, end),
            kind: WarningKind::DuplicateUrl {
              when: lexer.slice(import_data.start, end)?,
            },
          });
          return Some(());
        }
        import_data.prelude.push(ImportPreludeNode::Url {
          range: Range::new(start, end),
        });
        import_data.url = Some(value);
        import_data.url_flags = flags;
        import_data.url_range = Some(Range::new(start, end));
      }
      Scope::InBlock => self.dependency_context.push_dependency(Dependency::Url {
        request: value,
        range: Range::new(start, end),
        kind: UrlRangeKind::Function,
      }),
      _ => {}
    }
    Some(())
  }

  fn handle_string(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    match self.scope {
      Scope::InAtImport(ref mut import_data) => {
        let inside_url = matches!(
            self.balanced.last(),
            Some(last) if matches!(last.kind, BalancedItemKind::Url)
        );

        // Do not parse URLs in `supports(...)` and other strings if we already have a URL
        if import_data.in_supports() || (!inside_url && import_data.url.is_some()) {
          return Some(());
        }

        if inside_url && import_data.url.is_some() {
          self.handle_warning.handle_warning(Warning {
            range: Range::new(import_data.start, end),
            kind: WarningKind::DuplicateUrl {
              when: lexer.slice(import_data.start, end)?,
            },
          });
          return Some(());
        }

        let value = lexer.slice(start + 1, end - 1)?;
        import_data.url = Some(value);
        import_data.url_flags = flags;
        // For url("inside_url") url_range will determined in right_parenthesis
        if !inside_url {
          import_data.prelude.push(ImportPreludeNode::Url {
            range: Range::new(start, end),
          });
          import_data.url_range = Some(Range::new(start, end));
        }
      }
      Scope::InBlock => {
        if let Some(mode_data) = &self.mode_data
          && mode_data.is_property_local_mode()
          && matches!(
            self.in_grid_property,
            Some(GridPropertyKind::TemplateLike | GridPropertyKind::TemplateAreas)
          )
        {
          for range in parse_grid_template_area_ranges(lexer.slice(start + 1, end - 1)?, start + 1)
          {
            self
              .dependency_context
              .push_dependency(Dependency::LocalGridDecl {
                name: lexer.slice(range.start, range.end)?,
                range,
              });
          }
        }
        let Some(last) = self.balanced.last() else {
          return Some(());
        };
        let kind = match last.kind {
          BalancedItemKind::Url => UrlRangeKind::String,
          BalancedItemKind::ImageSet => UrlRangeKind::Function,
          _ => return Some(()),
        };
        let value = lexer.slice(start + 1, end - 1)?;
        self.dependency_context.push_dependency(Dependency::Url {
          request: value,
          range: Range::new(start, end),
          kind,
        });
      }
      _ => {}
    }
    Some(())
  }

  fn handle_at_keyword(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let name = stream.slice_trusted(start, end);
    let kind = Self::classify_at_rule(name, flags);
    self.set_scan_context(stream, ScanContext::AtRule);
    if kind == AtRuleKind::Namespace {
      self.scope = Scope::AtNamespaceInvalid;
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, end),
        kind: WarningKind::NamespaceNotSupportedInBundledCss,
      });
    } else if kind == AtRuleKind::Import {
      if !self.allow_import_at_rule {
        self.scope = Scope::AtImportInvalid;
        self.handle_warning.handle_warning(Warning {
          range: Range::new(start, end),
          kind: WarningKind::NotPrecededAtImport,
        });
        return Some(());
      }
      self.scope = Scope::InAtImport(ImportData::new(start));
    } else if kind == AtRuleKind::Charset {
      self.lex_charset_at_rule(stream, start)?;
      self.set_scan_context(stream, ScanContext::TopLevel);
      self.is_next_rule_prelude = true;
    } else if self.mode_data.is_some() {
      let mut can_contain_rules = true;
      if kind == AtRuleKind::Value {
        self.lex_value_at_rule(stream, start)?;
        can_contain_rules = false;
        self.set_scan_context(stream, ScanContext::TopLevel);
        self.is_next_rule_prelude = true;
      } else if kind == AtRuleKind::Keyframes {
        self.lex_local_keyframes_decl(stream)?;
      } else if kind == AtRuleKind::Container {
        self.lex_local_container_at_rule(stream)?;
      } else if kind == AtRuleKind::Function {
        self.lex_local_function_decl(stream)?;
      } else if kind == AtRuleKind::Property {
        self.lex_local_dashed_ident_decl(
          stream,
          |name, range| Dependency::LocalPropertyDecl { name, range },
          |range| Warning {
            range,
            kind: WarningKind::Unexpected {
              message: "Expected starts with '--' during parsing of '@property'",
            },
          },
          |range| Warning {
            range,
            kind: WarningKind::Unexpected {
              message: "Expected '{' during parsing of '@property'",
            },
          },
        )?;
      } else if kind == AtRuleKind::CounterStyle {
        self.lex_local_counter_style_decl(stream)?;
      } else if kind == AtRuleKind::FontPaletteValues {
        self.lex_local_dashed_ident_decl(
          stream,
          |name, range| Dependency::LocalFontPaletteDecl { name, range },
          |range| Warning {
            range,
            kind: WarningKind::Unexpected {
              message: "Expected starts with '--' during parsing of '@font-palette-values'",
            },
          },
          |range| Warning {
            range,
            kind: WarningKind::Unexpected {
              message: "Expected '{' during parsing of '@font-palette-values'",
            },
          },
        )?;
      } else {
        self.is_next_rule_prelude = kind == AtRuleKind::Scope;
        if self.is_next_rule_prelude {
          self.set_scan_context(stream, ScanContext::Selector);
        }
      }

      let mode_data = self
        .mode_data
        .as_mut()
        .expect("CSS Modules mode data must exist while handling an at-rule");
      if can_contain_rules && self.block_nesting_level == 0 {
        mode_data.composes_local_classes.find_at_keyword();
      }

      if mode_data.is_pure_mode() {
        mode_data.pure_global = None;
      }
    }
    Some(())
  }

  fn handle_semicolon(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
  ) -> Option<()> {
    match self.scope {
      Scope::InAtImport(ref import_data) => {
        let Some(url) = import_data.url else {
          if let Some((name, name_range)) = import_data.prelude.icss_import_url() {
            self
              .dependency_context
              .push_dependency(Dependency::ICSSImportUrl {
                name,
                range: Range::new(import_data.start, end),
                name_range: *name_range,
              });
            self.scope = Scope::TopLevel;
            return Some(());
          }
          self.handle_warning.handle_warning(Warning {
            range: Range::new(import_data.start, end),
            kind: WarningKind::ExpectedUrl {
              when: lexer.slice(import_data.start, end)?,
            },
          });
          self.scope = Scope::TopLevel;
          return Some(());
        };
        let Some(url_range) = &import_data.url_range else {
          self.handle_warning.handle_warning(Warning {
            range: Range::new(start, end),
            kind: WarningKind::Unexpected {
              message: "Unexpected ';' during parsing of '@import url()'",
            },
          });
          self.scope = Scope::TopLevel;
          return Some(());
        };
        if let Some(range) = import_data.prelude.first_non_url_before(url_range) {
          self.handle_warning.handle_warning(Warning {
            range: *url_range,
            kind: WarningKind::ExpectedUrlBefore {
              when: lexer.slice(range.start, url_range.end)?,
            },
          });
          self.scope = Scope::TopLevel;
          return Some(());
        }
        let layer = match &import_data.layer {
          ImportDataLayer::None => None,
          ImportDataLayer::EndLayer { value, range } => {
            if url_range.start > range.start {
              self.handle_warning.handle_warning(Warning {
                range: *url_range,
                kind: WarningKind::ExpectedUrlBefore {
                  when: lexer.slice(range.start, url_range.end)?,
                },
              });
              self.scope = Scope::TopLevel;
              return Some(());
            }
            Some(*value)
          }
        };
        let supports = match &import_data.supports {
          ImportDataSupports::None => None,
          ImportDataSupports::InSupports => {
            self.handle_warning.handle_warning(Warning {
              range: Range::new(start, end),
              kind: WarningKind::Unexpected {
                message: "Unexpected ';' during parsing of 'supports()'",
              },
            });
            None
          }
          ImportDataSupports::EndSupports { value, range } => {
            if url_range.start > range.start {
              self.handle_warning.handle_warning(Warning {
                range: *url_range,
                kind: WarningKind::ExpectedUrlBefore {
                  when: lexer.slice(range.start, url_range.end)?,
                },
              });
              self.scope = Scope::TopLevel;
              return Some(());
            }
            Some(*value)
          }
        };
        if let Some(layer_range) = import_data.layer_range()
          && let Some(supports_range) = import_data.supports_range()
          && layer_range.start > supports_range.start
        {
          self.handle_warning.handle_warning(Warning {
            range: *layer_range,
            kind: WarningKind::ExpectedLayerBefore {
              when: lexer.slice(supports_range.start, layer_range.end)?,
            },
          });
          self.scope = Scope::TopLevel;
          return Some(());
        }
        let last_end = import_data
          .supports_range()
          .or_else(|| import_data.layer_range())
          .unwrap_or(url_range)
          .end;
        let media = self.get_media(lexer, last_end, start);
        self.dependency_context.push_import(
          url,
          Range::new(import_data.start, end),
          layer,
          supports,
          media,
        );
        self.scope = Scope::TopLevel;
      }
      Scope::AtImportInvalid | Scope::AtNamespaceInvalid => {
        self.scope = Scope::TopLevel;
      }
      Scope::InBlock => {
        if let Some(mode_data) = &mut self.mode_data {
          mode_data.pure_global = Some(end);

          if mode_data.is_property_local_mode() {
            if self.in_animation_property.is_some() {
              self.handle_local_keyframes_dependency(lexer)?;
              self.exit_animation_property();
            }
            if self.in_list_style_property.is_some() {
              self.handle_local_counter_style_dependency(lexer)?;
              self.exit_list_style_property();
            }
            if self.in_font_palette_property.is_some() {
              self.handle_local_font_palette_dependency(lexer)?;
              self.exit_font_palette_property();
            }
            if self.in_container_property.is_some() {
              self.exit_container_property();
            }
            if self.in_grid_property.is_some() {
              self.exit_grid_property();
            }
          }
        }
        self.pending_custom_property = None;
        self.pending_grid_property = None;
        self.property_kind = PropertyKind::Generic;
      }
      Scope::TopLevel => {
        self.is_next_rule_prelude = true;
      }
    }
    Some(())
  }

  fn handle_function(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let name = stream.slice_trusted(start, end);
    let mut normalized = [0; MAX_CSS_KEYWORD_LEN];
    let normalized_name = if flags.has_escape() {
      decode_css_keyword(name, &mut normalized)
    } else {
      lowercase_ascii_keyword(name, &mut normalized)
    };
    let item = normalized_name.map_or_else(
      || BalancedItem::new_other(start, end),
      |name| BalancedItem::new_normalized(name, start, end),
    );
    let at_import_top_level =
      matches!(self.scope, Scope::InAtImport(_)) && self.balanced.is_empty();
    self.balanced.push(item, self.mode_data.as_mut());

    if let Scope::InAtImport(ref mut import_data) = self.scope {
      if at_import_top_level && normalized_name == Some("url(") {
        import_data.prelude.push(ImportPreludeNode::Url {
          range: Range::new(start, end),
        });
      } else if at_import_top_level && normalized_name == Some("layer(") {
        import_data.prelude.push(ImportPreludeNode::Layer {
          range: Range::new(start, end),
        });
      } else if at_import_top_level && normalized_name == Some("supports(") {
        import_data.prelude.push(ImportPreludeNode::Supports {
          range: Range::new(start, end),
        });
        import_data.supports = ImportDataSupports::InSupports;
      } else if at_import_top_level {
        import_data.prelude.push(ImportPreludeNode::Other {
          range: Range::new(start, end),
        });
      } else if normalized_name == Some("supports(") {
        import_data.supports = ImportDataSupports::InSupports;
      }
    }

    if let Scope::InAtImport(ref mut import_data) = self.scope {
      let layer_end = at_import_top_level && normalized_name == Some("layer(");
      let supports_end = normalized_name == Some("supports(");
      if layer_end || supports_end {
        let Some(close) = stream.fast_forward(TokenKind::RightParenthesis) else {
          return Some(());
        };
        self.balanced.pop(self.mode_data.as_mut());
        if layer_end {
          import_data.layer = ImportDataLayer::EndLayer {
            value: stream.slice(end, close.end.saturating_sub(1))?,
            range: Range::new(start, close.end),
          };
        } else {
          import_data.supports = ImportDataSupports::EndSupports {
            value: stream.slice(end, close.end.saturating_sub(1))?,
            range: Range::new(start, close.end),
          };
        }
        return Some(());
      }
    }

    let Some(mode_data) = &self.mode_data else {
      return Some(());
    };
    if mode_data.is_current_local_mode() && name.starts_with("--") && end > start + 1 {
      self
        .dependency_context
        .push_dependency(Dependency::LocalFunction {
          name: dashed_ident_name(stream.slice(start, end - 1)?)?,
          range: Range::new(start, end - 1),
        });
    }
    if mode_data.is_current_local_mode() && normalized_name == Some("var(") {
      self.lex_local_var(stream)?;
    }
    Some(())
  }

  fn handle_left_parenthesis(
    &mut self,
    _: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
  ) -> Option<()> {
    self
      .balanced
      .push(BalancedItem::new_other(start, end), self.mode_data.as_mut());
    Some(())
  }

  fn handle_right_parenthesis(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    leading_start: Pos,
    start: Pos,
    end: Pos,
  ) -> Option<()> {
    let Some(last) = self.balanced.pop(self.mode_data.as_mut()) else {
      return Some(());
    };
    if let Some(mode_data) = &mut self.mode_data {
      let mut is_function = last.kind.is_mode_function();
      let mut function_end = last.range.end;
      if last.kind.is_mode_class() {
        self.balanced.pop_mode_pseudo_class(mode_data);
        let popped = self
          .balanced
          .pop_without_moda_data()
          .expect("a mode pseudo-class must have a preceding balanced item");
        debug_assert!(!matches!(
          popped.kind,
          BalancedItemKind::GlobalClass | BalancedItemKind::LocalClass
        ));
        is_function = popped.kind.is_mode_function();
        function_end = popped.range.end;
      }
      if is_function {
        let is_empty = start == function_end || trivia_only(lexer.slice(function_end, start)?);
        let replacement_start = if is_empty {
          function_end
        } else {
          leading_start
        };
        if is_empty {
          let maybe_left_parenthesis_start = function_end.saturating_sub(1);
          self.handle_warning.handle_warning(Warning {
            range: Range::new(maybe_left_parenthesis_start, end),
            kind: WarningKind::Unexpected {
              message: "':global()' or ':local()' can't be empty",
            },
          });
        }
        self
          .dependency_context
          .push_dependency(Dependency::Replace {
            content: "",
            range: Range::new(replacement_start, end),
          });
      }
    }
    if let Scope::InAtImport(ref mut import_data) = self.scope {
      let not_in_supports = !import_data.in_supports();
      if matches!(last.kind, BalancedItemKind::Url) && not_in_supports {
        import_data.url_range = Some(Range::new(last.range.start, end));
      } else if matches!(last.kind, BalancedItemKind::Layer) && not_in_supports {
        import_data.layer = ImportDataLayer::EndLayer {
          value: lexer.slice(last.range.end, end - 1)?,
          range: Range::new(last.range.start, end),
        };
      } else if matches!(last.kind, BalancedItemKind::Supports) {
        import_data.supports = ImportDataSupports::EndSupports {
          value: lexer.slice(last.range.end, end - 1)?,
          range: Range::new(last.range.start, end),
        }
      }
    }
    Some(())
  }

  fn handle_ident(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let ident = stream.slice_trusted(start, end);
    // ICSS references can also occur in selectors and at-rule preludes,
    // where the scope is not necessarily a declaration block.
    if matches!(self.scope, Scope::TopLevel | Scope::InBlock)
      && matches!(
        self.scan_context,
        ScanContext::Selector
          | ScanContext::GenericValue
          | ScanContext::SpecialValue(_)
          | ScanContext::AtRule
      )
      && (self.scan_context != ScanContext::Selector || self.selector_square_depth == 0)
      && self.contains_icss_symbol(ident)
    {
      self
        .dependency_context
        .push_dependency(Dependency::ICSSSymbol {
          name: ident,
          range: Range::new(start, end),
        });
      if matches!(self.scope, Scope::TopLevel)
        && let Some(mode_data) = &mut self.mode_data
      {
        mode_data.composes_local_classes.invalidate();
      }
      return Some(());
    }
    match self.scope {
      Scope::InBlock => {
        let is_declaration_name = self.scan_context == ScanContext::DeclarationName;
        if is_declaration_name {
          let property_local_mode = self
            .mode_data
            .as_ref()
            .is_some_and(ModeData::is_property_local_mode);
          (self.property_kind, self.pending_grid_property) =
            Self::classify_property(ident, flags, property_local_mode);
          self.pending_custom_property =
            (self.property_kind == PropertyKind::CustomProperty).then_some(Range::new(start, end));
          if self.property_kind != PropertyKind::Composes {
            return Some(());
          }
        }
        let Some(mode_data) = &mut self.mode_data else {
          return Some(());
        };
        if mode_data.is_current_local_mode()
          && self
            .balanced
            .last()
            .is_some_and(|last| last.kind.is_mode_function())
          && ident.starts_with("--")
          && stream.peek_parser_token().token.kind == TokenKind::RightParenthesis
        {
          self
            .dependency_context
            .push_dependency(Dependency::LocalFunction {
              name: dashed_ident_name(stream.slice(start, end)?)?,
              range: Range::new(start, end),
            });
          return Some(());
        }
        if mode_data.is_property_local_mode()
          && matches!(self.scan_context, ScanContext::SpecialValue(_))
        {
          if let Some(animation) = &mut self.in_animation_property {
            // Not inside functions
            if self.balanced.is_empty() {
              animation.set_rename(stream.slice(start, end)?, flags, Range::new(start, end));
            }
            return Some(());
          }

          if let Some(list_style) = &mut self.in_list_style_property {
            // Not inside functions
            if self.balanced.is_empty() {
              list_style.set_rename(stream.slice(start, end)?, flags, Range::new(start, end));
            }
            return Some(());
          }

          if let Some(font_palette) = &mut self.in_font_palette_property {
            // Not inside functions or inside palette-mix()
            if self.balanced.is_empty()
              || matches!(self.balanced.last(), Some(last) if matches!(last.kind, BalancedItemKind::PaletteMix))
            {
              font_palette.set_rename(stream.slice(start, end)?, flags, Range::new(start, end));
            }
            return Some(());
          }

          if let Some(container) = &mut self.in_container_property {
            if self.balanced.is_empty() {
              container.set_rename(ident, flags, Range::new(start, end));
              if let Some(range) = container.take_rename(self.balanced.len()) {
                self
                  .dependency_context
                  .push_dependency(Dependency::LocalContainerDecl {
                    name: stream.slice(range.start, range.end)?,
                    range,
                  });
              }
            }
            return Some(());
          }

          if self.in_grid_property.is_some() {
            if self.balanced.is_empty() && !is_reserved_grid_ident(ident, flags) {
              self
                .dependency_context
                .push_dependency(Dependency::LocalGrid {
                  name: ident,
                  range: Range::new(start, end),
                });
            }
            return Some(());
          }
        }

        if is_declaration_name && self.property_kind == PropertyKind::Composes {
          if self.block_nesting_level != 1 {
            self.handle_warning.handle_warning(Warning {
              range: Range::new(start, end),
              kind: WarningKind::UnexpectedComposition {
                message: "not allowed in nested rule",
              },
            });
            return Some(());
          }
          let Some(local_classes) = mode_data
            .composes_local_classes
            .get_valid_local_classes(stream.lexer())
          else {
            self.handle_warning.handle_warning(Warning {
              range: Range::new(start, end),
              kind: WarningKind::UnexpectedComposition {
                message: "only allowed when selector is single :local class",
              },
            });
            return Some(());
          };
          return self.lex_composes(stream, local_classes, start);
        }
      }
      Scope::InAtImport(ref mut import_data) => {
        if !self.balanced.is_empty() || import_data.in_supports() {
          return Some(());
        }

        let ident = stream.slice_trusted(start, end);
        if ident.eq_ignore_ascii_case("layer") {
          import_data.prelude.push(ImportPreludeNode::Layer {
            range: Range::new(start, end),
          });
          import_data.layer = ImportDataLayer::EndLayer {
            value: "",
            range: Range::new(start, end),
          }
        } else if import_data.url.is_none() && import_data.prelude.is_empty() {
          import_data
            .prelude
            .push(ImportPreludeNode::IcssUrlCandidate {
              name: ident,
              range: Range::new(start, end),
            });
        } else if import_data.url.is_none() {
          import_data.prelude.push(ImportPreludeNode::Other {
            range: Range::new(start, end),
          });
        }
      }
      Scope::TopLevel => {
        let Some(mode_data) = &mut self.mode_data else {
          return Some(());
        };

        mode_data.composes_local_classes.invalidate();
      }
      _ => {}
    }
    Some(())
  }

  fn handle_class(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
    _flags: TokenFlags,
  ) -> Option<()> {
    let Some(mode_data) = &mut self.mode_data else {
      return Some(());
    };
    let name = lexer.slice_trusted(start, end);
    if name == "." {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, end),
        kind: WarningKind::Unexpected {
          message: "Invalid class selector syntax",
        },
      });
      return Some(());
    }
    if mode_data.is_current_local_mode() {
      self
        .dependency_context
        .push_dependency(Dependency::LocalClass {
          name,
          range: Range::new(start, end),
          explicit: mode_data.is_mode_explicit(),
        });
      if self.block_nesting_level == 0 {
        mode_data
          .composes_local_classes
          .find_local_class(start + 1, end);
      }

      if mode_data.is_pure_mode() {
        mode_data.pure_global = None;
      }
    }
    Some(())
  }

  fn handle_id(
    &mut self,
    lexer: &mut DependencyLexer<'s>,
    start: Pos,
    end: Pos,
    _flags: TokenFlags,
  ) -> Option<()> {
    let Some(mode_data) = &mut self.mode_data else {
      return Some(());
    };
    let name = lexer.slice_trusted(start, end);
    if name == "#" {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(start, end),
        kind: WarningKind::Unexpected {
          message: "Invalid id selector syntax",
        },
      });
      return Some(());
    }
    if mode_data.is_current_local_mode() {
      self
        .dependency_context
        .push_dependency(Dependency::LocalId {
          name,
          range: Range::new(start, end),
          explicit: mode_data.is_mode_explicit(),
        });

      if self.block_nesting_level == 0 {
        mode_data.composes_local_classes.invalidate();
      }

      if mode_data.is_pure_mode() {
        mode_data.pure_global = None;
      }
    }
    Some(())
  }

  fn handle_left_curly_bracket(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    _: Pos,
  ) -> Option<()> {
    if matches!(self.scope, Scope::InBlock)
      && self.scan_context != ScanContext::Selector
      && !self.balanced.is_empty()
    {
      self.balanced.push(
        BalancedItem::new_curly(start, start + 1),
        self.mode_data.as_mut(),
      );
      return Some(());
    }
    match self.scope {
      Scope::TopLevel => {
        self.allow_import_at_rule = false;
        self.scope = Scope::InBlock;
        if self.mode_data.is_none()
          || matches!(&self.mode_data, Some(mode_data) if !matches!(mode_data.composes_local_classes.is_single, SingleLocalClass::AtKeyword))
        {
          self.block_nesting_level = 1;
        }
      }
      Scope::InBlock => {
        let is_at_rule_block = matches!(
            &self.mode_data,
            Some(mode_data)
                if matches!(mode_data.composes_local_classes.is_single, SingleLocalClass::AtKeyword)
        );
        if !is_at_rule_block {
          self.block_nesting_level += 1;
        }
      }
      _ => return Some(()),
    }
    let (pure_check_disabled_for_selector, enter_pure_ignored_block) =
      if let Some(mode_data) = &self.mode_data {
        (
          mode_data.is_pure_check_disabled(),
          mode_data.pure_ignore_pending,
        )
      } else {
        (false, false)
      };
    if self.mode_data.is_none() {
      self.set_scan_context(stream, ScanContext::BlockItem);
      return Some(());
    }
    if let Some(mode_data) = &mut self.mode_data {
      if let Some(pure_global_start) = mode_data
        .pure_global
        .filter(|_| mode_data.is_pure_mode() && !pure_check_disabled_for_selector)
      {
        self.handle_warning.handle_warning(Warning {
                    range: Range::new(pure_global_start, start),
                    kind: WarningKind::NotPure {
                        message: "Selector is not pure (pure selectors must contain at least one local class or id)",
                    }
                });
      }

      if enter_pure_ignored_block {
        mode_data.enter_block(self.block_nesting_level);
      }

      if let Some(resulting_global_start) = mode_data
        .resulting_global
        .filter(|_| mode_data.is_current_local_mode())
      {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(resulting_global_start, start),
          kind: WarningKind::InconsistentModeResult,
        });
      }
      mode_data.resulting_global = None;

      self.balanced.update_property_mode(mode_data);
      self.balanced.pop_mode_pseudo_class(mode_data);
      if self.is_next_rule_prelude && self.block_nesting_level == 0 {
        let mode_data = self
          .mode_data
          .as_mut()
          .expect("CSS Modules mode data must exist while finishing a selector");
        mode_data.composes_local_classes.reset_to_initial();
      }

      debug_assert!(
        self.balanced.is_empty(),
        "balanced should be empty when end of selector"
      );
    }
    self.exit_container_property();
    self.exit_grid_property();
    self.pending_custom_property = None;
    self.pending_grid_property = None;
    self.property_kind = PropertyKind::Generic;
    self.set_scan_context(stream, ScanContext::BlockItem);
    Some(())
  }

  fn handle_right_curly_bracket(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    _: Pos,
    end: Pos,
  ) -> Option<()> {
    if matches!(self.scope, Scope::InBlock) {
      if matches!(
          self.balanced.last(),
          Some(last) if matches!(last.kind, BalancedItemKind::Curly)
      ) {
        self.balanced.pop(self.mode_data.as_mut());
        if self.block_nesting_level == 0 {
          self.scope = Scope::TopLevel;
          self.is_next_rule_prelude = true;
          self.set_scan_context(stream, ScanContext::TopLevel);
          if let Some(mode_data) = &mut self.mode_data {
            mode_data.composes_local_classes.reset_to_initial();
          }
        } else {
          self.set_scan_context(stream, ScanContext::BlockItem);
        }
        return Some(());
      }

      if let Some(mode_data) = &mut self.mode_data {
        mode_data.pure_global = Some(end);

        if mode_data.is_property_local_mode() {
          if self.in_animation_property.is_some() {
            self.handle_local_keyframes_dependency(stream.lexer_mut())?;
            self.exit_animation_property();
          }
          if self.in_list_style_property.is_some() {
            self.handle_local_counter_style_dependency(stream.lexer_mut())?;
            self.exit_list_style_property();
          }
          if self.in_font_palette_property.is_some() {
            self.handle_local_font_palette_dependency(stream.lexer_mut())?;
            self.exit_font_palette_property();
          }
          if self.in_container_property.is_some() {
            self.exit_container_property();
          }
          if self.in_grid_property.is_some() {
            self.exit_grid_property();
          }
        }
      }
      if self.block_nesting_level > 0 {
        self.block_nesting_level -= 1;
      }
      if let Some(mode_data) = &mut self.mode_data {
        mode_data.clear_pure_ignore_pending();
        mode_data.exit_block(self.block_nesting_level);
      }
      if self.block_nesting_level == 0 {
        self.scope = Scope::TopLevel;
        self.set_scan_context(stream, ScanContext::TopLevel);
        self.is_next_rule_prelude = true;
        if let Some(mode_data) = &mut self.mode_data {
          mode_data.composes_local_classes.reset_to_initial();
        }
      } else {
        self.set_scan_context(stream, ScanContext::BlockItem);
      }
      self.pending_custom_property = None;
      self.pending_grid_property = None;
      self.property_kind = PropertyKind::Generic;
    }
    Some(())
  }

  fn handle_pseudo_function(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let name = stream.slice_trusted(start, end);
    if let Some(mode_data) = &mut self.mode_data {
      if name.eq_ignore_ascii_case(":import(") {
        self.lex_icss_import(stream);
        self
          .dependency_context
          .push_dependency(Dependency::Replace {
            content: "",
            range: Range::new(start, stream.consumed_pos()),
          });
        return Some(());
      }
      if name.eq_ignore_ascii_case(":global(") || name.eq_ignore_ascii_case(":local(") {
        if mode_data.is_inside_mode_function() {
          self.handle_warning.handle_warning(Warning {
            range: Range::new(start, end),
            kind: WarningKind::ExpectedNotInside {
              pseudo: stream.slice(start, end)?,
            },
          });
        }

        let next = stream.peek_parser_token();
        if next.token.kind == TokenKind::Eof {
          return None;
        }
        self
          .dependency_context
          .push_dependency(Dependency::Replace {
            content: "",
            range: Range::new(start, next.token.range.start),
          });
      } else if self.block_nesting_level == 0 {
        mode_data.composes_local_classes.invalidate();
      }
    }
    self.balanced.push(
      BalancedItem::new(name, flags, start, end),
      self.mode_data.as_mut(),
    );
    Some(())
  }

  fn handle_pseudo_class(
    &mut self,
    stream: &mut DependencyTokenStream<'_, 's>,
    start: Pos,
    end: Pos,
    flags: TokenFlags,
  ) -> Option<()> {
    let Some(mode_data) = &mut self.mode_data else {
      return Some(());
    };
    let name = stream.slice_trusted(start, end);
    if name.eq_ignore_ascii_case(":global") || name.eq_ignore_ascii_case(":local") {
      if mode_data.is_inside_mode_function() {
        self.handle_warning.handle_warning(Warning {
          range: Range::new(start, end),
          kind: WarningKind::ExpectedNotInside {
            pseudo: stream.slice(start, end)?,
          },
        });
      }

      let next = stream.peek_parser_token();
      if next.token.kind == TokenKind::Eof {
        return None;
      }
      if !next.leading.has_whitespace() {
        let missing_whitespace = match stream.byte_at(next.token.range.start) {
          Some(b'.' | b'#') => true,
          Some(b'{') => next.leading.first_comment_start.is_some(),
          _ => false,
        };
        if missing_whitespace {
          self.handle_warning.handle_warning(Warning {
            range: Range::new(start, end),
            kind: WarningKind::Unexpected {
              message: "Missing trailing whitespace",
            },
          });
        }
      }
      self.balanced.push(
        BalancedItem::new(name, flags, start, end),
        self.mode_data.as_mut(),
      );
      self
        .dependency_context
        .push_dependency(Dependency::Replace {
          content: "",
          range: Range::new(
            start,
            next.leading.first_comment_start.unwrap_or(next.leading.end),
          ),
        });
      return Some(());
    }
    if matches!(self.scope, Scope::TopLevel) && name.eq_ignore_ascii_case(":export") {
      self.lex_icss_export(stream)?;
      self
        .dependency_context
        .push_dependency(Dependency::Replace {
          content: "",
          range: Range::new(start, stream.consumed_pos()),
        });
      return Some(());
    }

    if self.block_nesting_level == 0 {
      mode_data.composes_local_classes.invalidate();
    }
    Some(())
  }

  fn handle_comma(&mut self, lexer: &mut DependencyLexer<'s>, start: Pos, end: Pos) -> Option<()> {
    let Some(mode_data) = &mut self.mode_data else {
      return Some(());
    };

    if let Some(pure_global_start) = mode_data
      .pure_global
      .filter(|_| mode_data.is_pure_mode() && !mode_data.is_pure_check_disabled())
    {
      self.handle_warning.handle_warning(Warning {
                range: Range::new(pure_global_start, start),
                kind: WarningKind::NotPure {
                    message: "Selector is not pure (pure selectors must contain at least one local class or id)",
                }
            });
    }
    mode_data.pure_global = Some(end);

    if self.block_nesting_level == 0 {
      mode_data.composes_local_classes.find_comma(lexer)?;
    }

    if let Some(resulting_global_start) = mode_data
      .resulting_global
      .filter(|_| mode_data.is_current_local_mode())
    {
      self.handle_warning.handle_warning(Warning {
        range: Range::new(resulting_global_start, start),
        kind: WarningKind::InconsistentModeResult,
      });
    }

    if self.balanced.len() == 1 {
      let last = self
        .balanced
        .last()
        .expect("a balanced item must exist when the stack length is one");
      let is_local_class = matches!(last.kind, BalancedItemKind::LocalClass);
      let is_global_class = matches!(last.kind, BalancedItemKind::GlobalClass);
      if is_local_class || is_global_class {
        self.balanced.pop_mode_pseudo_class(mode_data);
        if mode_data.resulting_global.is_none() && is_global_class {
          mode_data.resulting_global = Some(start);
        }
      }
    }

    if matches!(self.scope, Scope::InBlock)
      && mode_data.is_property_local_mode()
      && self.in_animation_property.is_some()
    {
      self.handle_local_keyframes_dependency(lexer)?;
    }

    Some(())
  }
}