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use proc_macro::{TokenStream, TokenTree};
use crate::token::{Pos, Token, Tokens};
#[derive(Debug, Clone)]
pub(crate) struct Capture {
key: Token,
rust: TokenTree,
}
impl Capture {
fn new(key: Token, rust: TokenTree) -> Self {
Self { key, rust }
}
/// Token string inside `chunk!`
pub(crate) fn key(&self) -> &Token {
&self.key
}
/// As rust variable, e.g. `x`
pub(crate) fn as_rust(&self) -> &TokenTree {
&self.rust
}
}
#[derive(Debug)]
pub(crate) struct Captures(Vec<Capture>);
impl Captures {
pub(crate) fn new() -> Self {
Self(Vec::new())
}
pub(crate) fn add(&mut self, token: &Token) -> Capture {
let tt = token.tree();
let key = token.clone();
match self.0.iter().find(|arg| arg.key() == &key) {
Some(arg) => arg.clone(),
None => {
let arg = Capture::new(key, tt.clone());
self.0.push(arg.clone());
arg
}
}
}
pub(crate) fn captures(&self) -> &[Capture] {
&self.0
}
}
#[derive(Debug)]
pub(crate) struct Chunk {
source: String,
caps: Captures,
}
impl Chunk {
pub(crate) fn new(tokens: TokenStream) -> Self {
let tokens = Tokens::retokenize(tokens);
let mut source = String::new();
let mut caps = Captures::new();
let mut pos: Option<Pos> = None;
for t in tokens {
if t.is_cap() {
caps.add(&t);
}
let (line, col) = (t.start().line, t.start().column);
let (prev_line, prev_col) = pos
.take()
.map(|lc| (lc.line, lc.column))
.unwrap_or_else(|| (line, col));
#[allow(clippy::comparison_chain)]
if line > prev_line {
source.push('\n');
} else if line == prev_line {
for _ in 0..col.saturating_sub(prev_col) {
source.push(' ');
}
}
source.push_str(&t.to_string());
pos = Some(t.end());
}
Self {
source: source.trim_end().to_string(),
caps,
}
}
pub(crate) fn source(&self) -> &str {
&self.source
}
pub(crate) fn captures(&self) -> &[Capture] {
self.caps.captures()
}
}
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