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