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use crate::scanner::*;
use crate::token::{Token, TokenKind};
pub struct TomlScanner;
fn at(b: &[u8], i: usize) -> u8 {
if i < b.len() { b[i] } else { 0 }
}
impl Scanner for TomlScanner {
fn scan(&self, code: &str) -> Vec<Token> {
let b = code.as_bytes();
let mut tokens = Vec::new();
let mut i = 0;
while i < b.len() {
let c = b[i];
if c == b' ' || c == b'\t' || c == b'\r' {
i += 1;
continue;
}
// Newlines — reset line context
if c == b'\n' {
i += 1;
continue;
}
// Comments
if c == b'#'
&& let Some(end) = scan_hash_comment(b, i)
{
tokens.push(Token {
kind: TokenKind::Comment,
start: i,
end,
});
i = end;
continue;
}
// Section headers [section] or [[array]]
if c == b'[' {
let start = i;
let double = at(b, i + 1) == b'[';
i += if double { 2 } else { 1 };
while i < b.len() && b[i] != b']' && b[i] != b'\n' {
i += 1;
}
if at(b, i) == b']' {
i += 1;
}
if double && at(b, i) == b']' {
i += 1;
}
tokens.push(Token {
kind: TokenKind::Keyword,
start,
end: i,
});
continue;
}
// Triple-quoted strings
if c == b'"' && at(b, i + 1) == b'"' && at(b, i + 2) == b'"' {
let start = i;
i += 3;
while i + 2 < b.len() {
if b[i] == b'"' && b[i + 1] == b'"' && b[i + 2] == b'"' {
i += 3;
break;
}
i += 1;
}
tokens.push(Token {
kind: TokenKind::String,
start,
end: i.min(b.len()),
});
continue;
}
if c == b'\'' && at(b, i + 1) == b'\'' && at(b, i + 2) == b'\'' {
let start = i;
i += 3;
while i + 2 < b.len() {
if b[i] == b'\'' && b[i + 1] == b'\'' && b[i + 2] == b'\'' {
i += 3;
break;
}
i += 1;
}
tokens.push(Token {
kind: TokenKind::String,
start,
end: i.min(b.len()),
});
continue;
}
// Strings
if c == b'"'
&& let Some(end) = scan_double_string(b, i)
{
tokens.push(Token {
kind: TokenKind::String,
start: i,
end,
});
i = end;
continue;
}
if c == b'\''
&& let Some(end) = scan_single_string(b, i)
{
tokens.push(Token {
kind: TokenKind::String,
start: i,
end,
});
i = end;
continue;
}
// Numbers
if c.is_ascii_digit() || (c == b'+' || c == b'-') && at(b, i + 1).is_ascii_digit() {
let start = i;
if c == b'+' || c == b'-' {
i += 1;
}
if let Some(end) = scan_number(b, i) {
tokens.push(Token {
kind: TokenKind::Number,
start,
end,
});
i = end;
continue;
}
i = start;
}
// Date-time (basic detection: digit-digit-digit-digit-)
// Handled as numbers already mostly
// Identifiers (keys, or boolean/date values)
if let Some((end, ident)) = scan_ident(b, i) {
let kind = match ident {
b"true" | b"false" => TokenKind::Keyword,
b"inf" | b"nan" => TokenKind::Number,
_ => {
// Key if followed by =
let after = skip_whitespace_no_newline(b, end);
if at(b, after) == b'=' {
TokenKind::Property
} else {
TokenKind::Plain
}
}
};
tokens.push(Token {
kind,
start: i,
end,
});
i = end;
continue;
}
// = operator
if c == b'=' {
tokens.push(Token {
kind: TokenKind::Operator,
start: i,
end: i + 1,
});
i += 1;
continue;
}
// Punctuation
if matches!(c, b'{' | b'}' | b',' | b'.' | b']') {
tokens.push(Token {
kind: TokenKind::Punctuation,
start: i,
end: i + 1,
});
i += 1;
continue;
}
i += 1;
}
tokens
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::token::render;
fn hl(code: &str) -> String {
let tokens = TomlScanner.scan(code);
render(code, &tokens)
}
#[test]
fn section() {
let out = hl("[package]");
assert!(out.contains("tok-keyword"));
}
#[test]
fn key_value() {
let out = hl(r#"name = "test""#);
assert!(out.contains("tok-property"));
assert!(out.contains("tok-string"));
}
#[test]
fn boolean() {
let out = hl("enabled = true");
assert!(out.contains("tok-keyword"));
}
#[test]
fn comment() {
let out = hl("# comment");
assert!(out.contains("tok-comment"));
}
#[test]
fn number() {
let out = hl("port = 8080");
assert!(out.contains("tok-number"));
}
}