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use crate::{lexer::Token, SyntaxKind, SyntaxKind::EOF, TextRange, TextUnit};
use std::ops::{Add, AddAssign};
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> 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 }
}
/// Get the syntax kind of token at given input position.
pub fn kind(&self, pos: InputPosition) -> SyntaxKind {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return EOF;
}
self.tokens[idx].kind
}
/// Get the length of a token at given input position.
pub fn token_len(&self, pos: InputPosition) -> TextUnit {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return 0.into();
}
self.tokens[idx].len
}
/// Get the start position of a taken at given input position.
pub fn token_start_at(&self, pos: InputPosition) -> TextUnit {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return 0.into();
}
self.start_offsets[idx]
}
/// Get the raw text of a token at given input position.
pub fn token_text(&self, pos: InputPosition) -> &'t str {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return "";
}
let range = TextRange::offset_len(self.start_offsets[idx], self.tokens[idx].len);
&self.text[range]
}
}
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub(crate) struct InputPosition(u32);
impl InputPosition {
pub fn new() -> Self {
InputPosition(0)
}
}
impl Add<u32> for InputPosition {
type Output = InputPosition;
fn add(self, rhs: u32) -> InputPosition {
InputPosition(self.0 + rhs)
}
}
impl AddAssign<u32> for InputPosition {
fn add_assign(&mut self, rhs: u32) {
self.0 += rhs
}
}
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