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use ra_parser::TokenSource;
use crate::{
SyntaxKind, SyntaxKind::EOF, TextRange, TextUnit,
parsing::lexer::Token,
};
pub(crate) struct ParserInput<'t> {
text: &'t str,
/// start position of each token(expect whitespace and comment)
/// ```non-rust
/// struct Foo;
/// ^------^---
/// | | ^-
/// 0 7 10
/// ```
/// (token, start_offset): `[(struct, 0), (Foo, 7), (;, 10)]`
start_offsets: Vec<TextUnit>,
/// non-whitespace/comment tokens
/// ```non-rust
/// struct Foo {}
/// ^^^^^^ ^^^ ^^
/// ```
/// tokens: `[struct, Foo, {, }]`
tokens: Vec<Token>,
}
impl<'t> TokenSource for ParserInput<'t> {
fn token_kind(&self, pos: usize) -> SyntaxKind {
if !(pos < self.tokens.len()) {
return EOF;
}
self.tokens[pos].kind
}
fn is_token_joint_to_next(&self, pos: usize) -> bool {
if !(pos + 1 < self.tokens.len()) {
return true;
}
self.start_offsets[pos] + self.tokens[pos].len == self.start_offsets[pos + 1]
}
fn is_keyword(&self, pos: usize, kw: &str) -> bool {
if !(pos < self.tokens.len()) {
return false;
}
let range = TextRange::offset_len(self.start_offsets[pos], self.tokens[pos].len);
self.text[range] == *kw
}
}
impl<'t> ParserInput<'t> {
/// Generate input from tokens(expect comment and whitespace).
pub fn new(text: &'t str, raw_tokens: &'t [Token]) -> ParserInput<'t> {
let mut tokens = Vec::new();
let mut start_offsets = Vec::new();
let mut len = 0.into();
for &token in raw_tokens.iter() {
if !token.kind.is_trivia() {
tokens.push(token);
start_offsets.push(len);
}
len += token.len;
}
ParserInput { text, start_offsets, tokens }
}
}
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