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Continue revisions to the lexer

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This commit is contained in:
Jeff 2024-11-07 19:22:22 -05:00
parent 2e51112b4b
commit d15247a799
1 changed files with 38 additions and 7 deletions
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45
dust-lang/src/lexer.rs
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@ -352,21 +352,30 @@ impl<'src> Lexer<'src> {
}
fn lex_minus(&mut self) -> Result<(Token<'src>, Span), LexError> {
let start_pos = self.position;
let start_position = self.position;
if self.peek_char().is_some_and(|char| char.is_ascii_digit()) {
return self.lex_numeric();
}
self.next_char();
if let Some('=') = self.peek_char() {
self.next_char();
Ok((Token::MinusEqual, Span(start_pos, self.position)))
} else if self.peek_chars(8) == "Infinity" {
return Ok((Token::MinusEqual, Span(start_position, self.position)));
}
if self.peek_chars(8) == "Infinity" {
self.position += 8;
Ok((Token::Float("Infinity"), Span(start_pos, self.position)))
} else {
Ok((Token::Minus, Span(start_pos, self.position)))
return Ok((
Token::Float("-Infinity"),
Span(start_position, self.position),
));
}
Ok((Token::Minus, Span(start_position, self.position)))
}
fn lex_star(&mut self) -> Result<(Token<'src>, Span), LexError> {
@ -553,6 +562,22 @@ impl<'src> Lexer<'src> {
Ok((Token::RightBracket, Span(start_pos, self.position)))
}
fn lex_left_brace(&mut self) -> Result<(Token<'src>, Span), LexError> {
let start_pos = self.position;
self.next_char();
Ok((Token::LeftBrace, Span(start_pos, self.position)))
}
fn lex_right_brace(&mut self) -> Result<(Token<'src>, Span), LexError> {
let start_pos = self.position;
self.next_char();
Ok((Token::RightBrace, Span(start_pos, self.position)))
}
}
type LexerFn<'src> = fn(&mut Lexer<'src>) -> Result<(Token<'src>, Span), LexError>;
@ -567,7 +592,7 @@ impl<'src> From<&char> for LexRule<'src> {
'0'..='9' => LexRule {
lexer: Lexer::lex_numeric,
},
'Z'..='a' => LexRule {
char if char.is_alphabetic() => LexRule {
lexer: Lexer::lex_keyword_or_identifier,
},
'"' => LexRule {
@ -621,6 +646,12 @@ impl<'src> From<&char> for LexRule<'src> {
']' => LexRule {
lexer: Lexer::lex_right_bracket,
},
'{' => LexRule {
lexer: Lexer::lex_left_brace,
},
'}' => LexRule {
lexer: Lexer::lex_right_brace,
},
_ => LexRule {
lexer: Lexer::lex_unexpected,
},