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#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Token<'a> {
Ident(&'a str),
Punct(Punct),
String(String<'a>),
Number(&'a str),
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Punct(pub char, pub Spacing);
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Spacing {
Alone,
Joint,
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct String<'a> {
pub pieces: Vec<StringPiece<'a>>,
pub kind: StringKind,
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum StringPiece<'a> {
Chars(&'a str),
Escape(char),
Interp(TokenStream<'a>),
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum StringKind {
String,
RawString,
ScriptString,
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct TokenStream<'a>(pub Vec<Token<'a>>);
impl<'a> peg::Parse for TokenStream<'a> {
type PositionRepr = usize;
fn start(&self) -> usize {
0
}
fn is_eof(&self, pos: usize) -> bool {
pos >= self.0.len()
}
fn position_repr(&self, pos: usize) -> Self::PositionRepr {
pos
}
}
impl<'input, 'a: 'input> peg::ParseElem<'input> for TokenStream<'a> {
type Element = &'input Token<'a>;
fn parse_elem(&'input self, pos: usize) -> peg::RuleResult<Self::Element> {
use peg::RuleResult;
match self.0[pos..].first() {
Some(c) => RuleResult::Matched(pos + 1, c),
None => RuleResult::Failed,
}
}
}
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