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use crate::scanner::Scanner;
use crate::token::{Token, TokenKind};
pub struct XmlScanner;
fn at(b: &[u8], i: usize) -> u8 {
if i < b.len() { b[i] } else { 0 }
}
impl Scanner for XmlScanner {
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() {
// Comments <!-- -->
if b[i..].starts_with(b"<!--") {
let start = i;
i += 4;
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::Comment,
start,
end: i.min(b.len()),
});
continue;
}
// CDATA <![CDATA[...]]>
if b[i..].starts_with(b"<![CDATA[") {
let start = i;
i += 9;
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;
}
// Processing instructions <?...?>
if b[i..].starts_with(b"<?") {
let start = i;
i += 2;
while i + 1 < b.len() {
if b[i] == b'?' && b[i + 1] == b'>' {
i += 2;
break;
}
i += 1;
}
tokens.push(Token {
kind: TokenKind::Keyword,
start,
end: i.min(b.len()),
});
continue;
}
// Tags
if b[i] == b'<' {
let start = i;
i += 1;
if at(b, i) == b'/' {
i += 1;
}
if at(b, i).is_ascii_alphabetic() || at(b, i) == b'_' {
while i < b.len()
&& (b[i].is_ascii_alphanumeric()
|| b[i] == b'-'
|| b[i] == b'_'
|| b[i] == b':'
|| b[i] == b'.')
{
i += 1;
}
tokens.push(Token {
kind: TokenKind::Keyword,
start,
end: i,
});
// Attributes
while i < b.len() && b[i] != b'>' {
if b[i] == b' ' || b[i] == b'\t' || b[i] == b'\n' || b[i] == b'\r' {
i += 1;
continue;
}
if b[i] == b'/' && at(b, i + 1) == b'>' {
tokens.push(Token {
kind: TokenKind::Punctuation,
start: i,
end: i + 2,
});
i += 2;
break;
}
if b[i].is_ascii_alphabetic() || b[i] == b'_' || b[i] == b':' {
let as_ = i;
while i < b.len()
&& (b[i].is_ascii_alphanumeric()
|| b[i] == b'-'
|| b[i] == b'_'
|| b[i] == b':')
{
i += 1;
}
tokens.push(Token {
kind: TokenKind::Attr,
start: as_,
end: i,
});
while i < b.len() && b[i] == b' ' {
i += 1;
}
if at(b, i) == b'=' {
tokens.push(Token {
kind: TokenKind::Operator,
start: i,
end: i + 1,
});
i += 1;
while i < b.len() && b[i] == b' ' {
i += 1;
}
if at(b, i) == b'"' || at(b, i) == b'\'' {
let q = b[i];
let vs = i;
i += 1;
while i < b.len() && b[i] != q {
i += 1;
}
if i < b.len() {
i += 1;
}
tokens.push(Token {
kind: TokenKind::String,
start: vs,
end: i,
});
}
}
continue;
}
i += 1;
}
if i < b.len() && b[i] == 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 {
render(code, &XmlScanner.scan(code))
}
#[test]
fn tag() {
assert!(hl("<root>").contains("tok-keyword"));
}
#[test]
fn attr() {
assert!(hl(r#"<div id="x">"#).contains("tok-attr"));
}
#[test]
fn comment() {
assert!(hl("<!-- hi -->").contains("tok-comment"));
}
#[test]
fn cdata() {
assert!(hl("<![CDATA[data]]>").contains("tok-string"));
}
#[test]
fn closing() {
assert!(hl("</div>").contains("tok-keyword"));
}
}