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use super::errors::{LexError, LexResult};
use super::*;
impl Lexer {
/// Lexes inside a control block after `{#if`, `{#for`, `{:else if`, `{:case`, etc.
/// The opening keyword is already consumed as part of the token.
/// This mode handles the condition/expression until the closing `}`.
pub(super) fn lex_control_block(&mut self) -> LexResult<SyntaxKind> {
let remaining = self.remaining();
// Skip whitespace
if let Some(c) = self.peek()
&& c.is_whitespace()
{
self.consume_while(|c| c.is_whitespace());
return Ok(SyntaxKind::Whitespace);
}
// Check for closing brace - ends the control block
if remaining.starts_with("}") {
self.advance(1);
self.pop_mode();
return Ok(SyntaxKind::RBrace);
}
// Check for `let` keyword (used in `{#if let ...}` patterns)
if remaining.starts_with("let") {
let next_char = remaining.chars().nth(3);
if next_char
.map(|c| !c.is_alphanumeric() && c != '_')
.unwrap_or(true)
{
self.advance(3);
return Ok(SyntaxKind::LetKw);
}
}
// Check for `in` keyword (used in `{#for x in items}`)
if remaining.starts_with("in") {
let next_char = remaining.chars().nth(2);
if next_char
.map(|c| !c.is_alphanumeric() && c != '_')
.unwrap_or(true)
{
self.advance(2);
return Ok(SyntaxKind::InKw);
}
}
// Tokenize granularly for the condition/expression
if let Some(c) = self.peek() {
if c.is_alphabetic() || c == '_' {
// Identifier
self.consume_while(|c| c.is_alphanumeric() || c == '_');
Ok(SyntaxKind::Ident)
} else {
// Single character operators/punctuation
match c {
'(' | ')' | '[' | ']' | '{' | ',' | '.' | ':' | ';' | '+' | '-' | '*' | '/'
| '%' | '&' | '|' | '^' | '!' | '=' | '<' | '>' | '?' | '@' | '#' | '$'
| '~' => {
self.advance(1);
Ok(SyntaxKind::Text)
}
'"' => {
// String literal
self.advance(1);
while let Some(c) = self.peek() {
if c == '\\' {
self.advance(2);
} else if c == '"' {
self.advance(1);
break;
} else {
self.advance(c.len_utf8());
}
}
Ok(SyntaxKind::Text)
}
'\'' => {
// Char literal
self.advance(1);
while let Some(c) = self.peek() {
if c == '\\' {
self.advance(2);
} else if c == '\'' {
self.advance(1);
break;
} else {
self.advance(c.len_utf8());
}
}
Ok(SyntaxKind::Text)
}
_ => {
// Numbers or other characters
if c.is_numeric() {
self.consume_while(|c| c.is_alphanumeric() || c == '_' || c == '.');
} else {
self.advance(c.len_utf8());
}
Ok(SyntaxKind::Text)
}
}
}
} else {
Err(LexError::unexpected_eof(
self.pos,
"control block condition",
))
}
}
}