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105 lines
3.2 KiB
105 lines
3.2 KiB
3 years ago
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//! Template literal parsing.
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//!
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//! More information:
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//! - [MDN documentation][mdn]
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//! - [ECMAScript specification][spec]
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//!
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//! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
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//! [spec]: https://tc39.es/ecma262/#sec-template-literals
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use crate::{
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profiler::BoaProfiler,
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syntax::{
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ast::node::template::{TemplateElement, TemplateLit},
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ast::Position,
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ast::Punctuator,
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lexer::TokenKind,
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parser::cursor::Cursor,
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parser::expression::Expression,
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parser::{AllowAwait, AllowYield, ParseError, TokenParser},
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},
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};
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use std::io::Read;
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/// Parses a template literal.
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///
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/// More information:
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/// - [MDN documentation][mdn]
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/// - [ECMAScript specification][spec]
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///
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
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/// [spec]: https://tc39.es/ecma262/#prod-TemplateLiteral
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#[derive(Debug, Clone)]
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pub(super) struct TemplateLiteral {
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allow_yield: AllowYield,
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allow_await: AllowAwait,
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start: Position,
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first: String,
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}
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impl TemplateLiteral {
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/// Creates a new `TemplateLiteral` parser.
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pub(super) fn new<Y, A>(allow_yield: Y, allow_await: A, start: Position, first: &str) -> Self
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where
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Y: Into<AllowYield>,
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A: Into<AllowAwait>,
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{
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Self {
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allow_yield: allow_yield.into(),
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allow_await: allow_await.into(),
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start,
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first: first.to_owned(),
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}
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}
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}
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impl<R> TokenParser<R> for TemplateLiteral
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where
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R: Read,
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{
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type Output = TemplateLit;
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fn parse(self, cursor: &mut Cursor<R>) -> Result<Self::Output, ParseError> {
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let _timer = BoaProfiler::global().start_event("TemplateLiteral", "Parsing");
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let mut elements = Vec::new();
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elements.push(TemplateElement::String(self.first.into_boxed_str()));
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elements.push(TemplateElement::Expr(
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Expression::new(true, self.allow_yield, self.allow_await).parse(cursor)?,
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));
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cursor.expect(
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TokenKind::Punctuator(Punctuator::CloseBlock),
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"template literal",
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)?;
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loop {
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match cursor.lex_template(self.start)?.kind() {
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TokenKind::TemplateMiddle {
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cooked: template, ..
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} => {
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elements.push(TemplateElement::String(template.to_owned()));
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elements.push(TemplateElement::Expr(
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Expression::new(true, self.allow_yield, self.allow_await).parse(cursor)?,
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));
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cursor.expect(
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TokenKind::Punctuator(Punctuator::CloseBlock),
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"template literal",
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)?;
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}
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TokenKind::TemplateNoSubstitution {
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cooked: template, ..
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} => {
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elements.push(TemplateElement::String(template.to_owned()));
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return Ok(TemplateLit::new(elements));
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}
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_ => {
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return Err(ParseError::general(
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"cannot parse template literal",
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self.start,
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))
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}
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}
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}
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}
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}
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