48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
use {Token, SyntaxKind};
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use syntax_kinds::*;
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mod ptr;
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use self::ptr::Ptr;
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mod classes;
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use self::classes::*;
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pub fn next_token(text: &str) -> Token {
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assert!(!text.is_empty());
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let mut ptr = Ptr::new(text);
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let c = ptr.bump().unwrap();
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let kind = next_token_inner(c, &mut ptr);
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let len = ptr.into_len();
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Token { kind, len }
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}
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fn next_token_inner(c: char, ptr: &mut Ptr) -> SyntaxKind {
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// Note: r as in r" or r#" is part of a raw string literal,
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// b as in b' is part of a byte literal.
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// They are not identifiers, and are handled further down.
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let ident_start = is_ident_start(c) && !string_literal_start(c, ptr.next(), ptr.nnext());
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if ident_start {
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ptr.bump_while(is_ident_continue);
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return IDENT;
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}
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if is_whitespace(c) {
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ptr.bump_while(is_whitespace);
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return WHITESPACE;
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}
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return ERROR
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}
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fn string_literal_start(c: char, c1: Option<char>, c2: Option<char>) -> bool {
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match (c, c1, c2) {
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('r', Some('"'), _) |
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('r', Some('#'), _) |
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('b', Some('"'), _) |
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('b', Some('\''), _) |
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('b', Some('r'), Some('"')) |
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('b', Some('r'), Some('#')) => true,
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_ => false
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}
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}
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