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Add function parsing

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Vili Sinervä 2025-01-29 14:34:21 +02:00
parent a7adbe0f5b
commit 2bc9b0aa8d
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1 changed files with 29 additions and 2 deletions
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27
src/compiler/parser.rs
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@ -105,9 +105,36 @@ fn parse_bool_literal<'source>(pos: &mut usize, tokens: &[Token]) -> Expression<
}
}
fn parse_function<'source>(pos: &mut usize, tokens: &[Token<'source>]) -> Expression<'source> {
let identifier = next_expect_type(pos, tokens, TokenType::Identifier);
next_expect_string(pos, tokens, "(");
let mut arguments = Vec::new();
// If/loop used instead of while to show that we will always use break to exit the loop
if peek(pos, tokens).text != ")" {
loop {
arguments.push(Box::new(parse_expression(pos, tokens)));
match peek(pos, tokens).text {
"," => next_expect_string(pos, tokens, ","),
_ => break, // Break out of the loop. Intentionally causes a panic with a missing comma
};
}
}
next_expect_string(pos, tokens, ")");
FunCall(identifier.text, arguments)
}
fn parse_identifier<'source>(pos: &mut usize, tokens: &[Token<'source>]) -> Expression<'source> {
if peek(&mut (*pos + 1), tokens).text == "(" {
parse_function(pos, tokens)
} else {
let token = next_expect_type(pos, tokens, TokenType::Identifier);
Identifier(token.text)
}
}
fn parse_parenthesized<'source>(pos: &mut usize, tokens: &[Token<'source>]) -> Expression<'source> {