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//! HTML tokenizer for Vue templates.
//!
//! This tokenizer is adapted from htmlparser2 and Vue's compiler-core.
//! It uses a state machine to tokenize HTML/Vue templates.
#[cfg(feature = "native-markup-lex")]
pub mod adapter;
pub mod char_codes;
mod dynamic_arg;
pub mod entity_decode;
mod in_tag_comment;
mod sequences;
mod states;
mod types;
pub use types::*;
use sequences::Sequence;
/// HTML tokenizer
pub struct Tokenizer<'a, C: Callbacks> {
/// Input source
input: &'a [u8],
/// Current state
state: State,
/// Some behavior, eg. when decoding entities, is done while we are in another state. This keeps track of the other state type.
base_state: State,
/// Buffer start position
section_start: usize,
/// Current index
index: usize,
/// Callbacks
callbacks: C,
/// Delimiter open sequence
delimiter_open: &'a [u8],
/// Delimiter close sequence
delimiter_close: &'a [u8],
/// Current delimiter index
delimiter_index: usize,
/// The start of the last entity.
entity_start: usize,
/// Closing sequence currently being matched.
current_sequence: Option<Sequence>,
/// Index of the next expected byte in that sequence.
sequence_index: usize,
/// For special parsing behavior inside of script and style tags.
in_rcdata: bool,
/// True immediately after a quoted attribute value ended.
///
/// The tokenizer needs this one-token memory to report `<div a="b"c>` as
/// recoverable missing whitespace instead of silently starting `c`.
after_quoted_attr_value: bool,
/// Whether to tolerate top-level markup declarations such as `<!DOCTYPE html>`.
///
/// In the default (SFC `<template>`) mode this stays `false`, so a stray
/// declaration is reported as a recoverable `IncorrectlyOpenedComment` and
/// the hot path is byte-identical. Document mode sets it `true` so a real
/// HTML document's doctype is skipped silently instead of producing a
/// spurious parse error.
tolerate_declarations: bool,
/// Whether to recognize Vue 1.x triple-mustache raw-HTML interpolation,
/// `{{{ expr }}}` (the pre-Vue-2 `v-html` equivalent).
///
/// Resolved once per file from the dialect capabilities; the default Vue 3
/// path leaves it `false`, so the interpolation states stay byte-identical
/// to today and `{{{ x }}}` keeps tokenizing as a `{{ … }}` mustache with a
/// stray brace. Only ever set behind the `legacy` feature for a Vue 1.x
/// document, and only honored with the default `{{`/`}}` delimiters.
triple_mustache: bool,
/// True while the currently open interpolation is a `{{{ … }}}` raw-HTML
/// one. Reset when the interpolation closes; meaningless (always `false`)
/// unless [`Tokenizer::triple_mustache`] is set.
in_raw_interpolation: bool,
/// Whether to recognize experimental Vue `//` in-tag comments in opening
/// tag attribute lists.
in_tag_comments: bool,
}
impl<'a, C: Callbacks> Tokenizer<'a, C> {
/// Create a new tokenizer
pub fn new(input: &'a str, callbacks: C) -> Self {
Self::with_delimiters(input, callbacks, b"{{", b"}}")
}
/// Create a new tokenizer with custom delimiters
pub fn with_delimiters(
input: &'a str,
callbacks: C,
delimiter_open: &'a [u8],
delimiter_close: &'a [u8],
) -> Self {
Self {
input: input.as_bytes(),
state: State::Text,
section_start: 0,
index: 0,
callbacks,
delimiter_open,
delimiter_close,
delimiter_index: 0,
entity_start: 0,
base_state: State::Text,
current_sequence: None,
sequence_index: 0,
in_rcdata: false,
after_quoted_attr_value: false,
tolerate_declarations: false,
triple_mustache: false,
in_raw_interpolation: false,
in_tag_comments: false,
}
}
#[inline]
fn at_opening_delimiter(&self, c: u8) -> bool {
self.delimiter_open.first() == Some(&c)
}
#[inline]
fn at_closing_delimiter(&self, c: u8) -> bool {
self.delimiter_close.first() == Some(&c)
}
/// Tolerate top-level markup declarations (e.g. `<!DOCTYPE html>`) instead of
/// reporting them as recoverable errors. Used by document parse mode.
pub fn set_tolerate_declarations(&mut self, tolerate: bool) {
self.tolerate_declarations = tolerate;
}
/// Enable recognition of Vue 1.x triple-mustache raw-HTML interpolation
/// (`{{{ expr }}}`). Off by default; only the `legacy` Vue 1.x path turns it
/// on. Honored only with the default `{{`/`}}` delimiters, so a custom
/// delimiter configuration is unaffected.
pub fn set_triple_mustache(&mut self, enabled: bool) {
self.triple_mustache = enabled && self.delimiter_open == b"{{";
}
/// Enable experimental Vue `//` in-tag comments in opening tag attribute lists.
pub fn set_in_tag_comments(&mut self, enabled: bool) {
self.in_tag_comments = enabled;
}
/// Skip through the buffer until a target byte is found.
fn fast_forward_to(&mut self, c: u8) -> bool {
while self.index + 1 < self.input.len() {
self.index += 1;
if self.input.get(self.index) == Some(&c) {
return true;
}
}
self.index = self.input.len().saturating_sub(1);
false
}
/// Tokenize the input
pub fn tokenize(&mut self) {
while let Some(&c) = self.input.get(self.index) {
match self.state {
State::Text => self.state_text(c),
State::InterpolationOpen => self.state_interpolation_open(c),
State::Interpolation => self.state_interpolation(c),
State::InterpolationClose => self.state_interpolation_close(c),
State::BeforeTagName => self.state_before_tag_name(c),
State::InTagName => self.state_in_tag_name(c),
State::InSelfClosingTag => self.state_in_self_closing_tag(c),
State::BeforeClosingTagName => self.state_before_closing_tag_name(c),
State::InClosingTagName => self.state_in_closing_tag_name(c),
State::AfterClosingTagName => self.state_after_closing_tag_name(c),
State::BeforeAttrName => self.state_before_attr_name(c),
State::InTagComment => self.state_in_tag_comment(c),
State::InAttrName => self.state_in_attr_name(c),
State::InDirName => self.state_in_dir_name(c),
State::InDirArg => self.state_in_dir_arg(c),
State::InDirDynamicArg => self.state_in_dir_dynamic_arg(c),
State::InDirModifier => self.state_in_dir_modifier(c),
State::AfterAttrName => self.state_after_attr_name(c),
State::BeforeAttrValue => self.state_before_attr_value(c),
State::InAttrValueDq => self.state_in_attr_value_dq(c),
State::InAttrValueSq => self.state_in_attr_value_sq(c),
State::InAttrValueNq => self.state_in_attr_value_nq(c),
State::BeforeDeclaration => self.state_before_declaration(c),
State::InDeclaration => self.state_in_declaration(c),
State::InProcessingInstruction => self.state_in_processing_instruction(c),
State::BeforeComment => self.state_before_comment(c),
State::CDATASequence => self.state_cdata_sequence(c),
State::InSpecialComment => self.state_in_special_comment(c),
State::InCommentLike => self.state_in_comment_like(c),
State::BeforeSpecialS => self.state_before_special_s(c),
State::BeforeSpecialT => self.state_before_special_t(c),
State::SpecialStartSequence => self.state_special_start_sequence(c),
State::InRCDATA => self.state_in_rcdata(c),
State::InEntity => self.state_in_entity(),
State::InSFCRootTagName => self.state_in_sfc_root_tag_name(c),
}
self.index += 1;
}
// Handle remaining content
self.cleanup();
self.callbacks.on_end();
}
}
#[cfg(test)]
mod empty_delimiter_tests;
#[cfg(test)]
mod tests;