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295 lines
8.4 KiB
295 lines
8.4 KiB
//! Function definition 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/Operators/function |
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//! [spec]: https://tc39.es/ecma262/#sec-function-definitions |
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#[cfg(test)] |
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mod tests; |
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use crate::{ |
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syntax::{ |
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ast::{ |
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node::{self}, |
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Punctuator, |
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}, |
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lexer::{InputElement, TokenKind}, |
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parser::{ |
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expression::Initializer, |
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statement::{BindingIdentifier, StatementList}, |
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AllowAwait, AllowYield, Cursor, ParseError, TokenParser, |
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}, |
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}, |
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BoaProfiler, |
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}; |
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use std::io::Read; |
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/// Formal parameters 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/Glossary/Parameter |
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/// [spec]: https://tc39.es/ecma262/#prod-FormalParameters |
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#[derive(Debug, Clone, Copy)] |
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pub(in crate::syntax::parser) struct FormalParameters { |
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allow_yield: AllowYield, |
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allow_await: AllowAwait, |
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} |
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impl FormalParameters { |
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/// Creates a new `FormalParameters` parser. |
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pub(in crate::syntax::parser) fn new<Y, A>(allow_yield: Y, allow_await: A) -> 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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} |
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} |
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} |
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impl<R> TokenParser<R> for FormalParameters |
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where |
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R: Read, |
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{ |
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type Output = Box<[node::FormalParameter]>; |
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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("FormalParameters", "Parsing"); |
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cursor.set_goal(InputElement::RegExp); |
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let mut params = Vec::new(); |
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if cursor.peek(0)?.ok_or(ParseError::AbruptEnd)?.kind() |
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== &TokenKind::Punctuator(Punctuator::CloseParen) |
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{ |
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return Ok(params.into_boxed_slice()); |
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} |
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loop { |
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let mut rest_param = false; |
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let next_param = match cursor.peek(0)? { |
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Some(tok) if tok.kind() == &TokenKind::Punctuator(Punctuator::Spread) => { |
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rest_param = true; |
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FunctionRestParameter::new(self.allow_yield, self.allow_await).parse(cursor)? |
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} |
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_ => FormalParameter::new(self.allow_yield, self.allow_await).parse(cursor)?, |
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}; |
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params.push(next_param); |
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if cursor.peek(0)?.ok_or(ParseError::AbruptEnd)?.kind() |
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== &TokenKind::Punctuator(Punctuator::CloseParen) |
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{ |
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break; |
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} |
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if rest_param { |
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return Err(ParseError::unexpected( |
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cursor.next()?.expect("peeked token disappeared"), |
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"rest parameter must be the last formal parameter", |
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)); |
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} |
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cursor.expect(Punctuator::Comma, "parameter list")?; |
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} |
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Ok(params.into_boxed_slice()) |
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} |
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} |
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/// Rest parameter 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/Functions/rest_parameters |
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/// [spec]: https://tc39.es/ecma262/#prod-FunctionRestParameter |
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type FunctionRestParameter = BindingRestElement; |
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/// Rest parameter 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/Functions/rest_parameters |
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/// [spec]: https://tc39.es/ecma262/#prod-BindingRestElement |
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#[derive(Debug, Clone, Copy)] |
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struct BindingRestElement { |
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allow_yield: AllowYield, |
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allow_await: AllowAwait, |
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} |
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impl BindingRestElement { |
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/// Creates a new `BindingRestElement` parser. |
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fn new<Y, A>(allow_yield: Y, allow_await: A) -> 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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} |
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} |
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} |
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impl<R> TokenParser<R> for BindingRestElement |
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where |
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R: Read, |
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{ |
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type Output = node::FormalParameter; |
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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("BindingRestElement", "Parsing"); |
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cursor.expect(Punctuator::Spread, "rest parameter")?; |
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let param = BindingIdentifier::new(self.allow_yield, self.allow_await).parse(cursor)?; |
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// TODO: BindingPattern |
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Ok(Self::Output::new(param, None, true)) |
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} |
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} |
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/// Formal parameter 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/Glossary/Parameter |
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/// [spec]: https://tc39.es/ecma262/#prod-FormalParameter |
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#[derive(Debug, Clone, Copy)] |
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struct FormalParameter { |
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allow_yield: AllowYield, |
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allow_await: AllowAwait, |
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} |
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impl FormalParameter { |
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/// Creates a new `FormalParameter` parser. |
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fn new<Y, A>(allow_yield: Y, allow_await: A) -> 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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} |
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} |
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} |
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impl<R> TokenParser<R> for FormalParameter |
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where |
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R: Read, |
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{ |
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type Output = node::FormalParameter; |
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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("FormalParameter", "Parsing"); |
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// TODO: BindingPattern |
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let param = BindingIdentifier::new(self.allow_yield, self.allow_await).parse(cursor)?; |
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let init = if let Some(t) = cursor.peek(0)? { |
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// Check that this is an initilizer before attempting parse. |
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if *t.kind() == TokenKind::Punctuator(Punctuator::Assign) { |
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Some(Initializer::new(true, self.allow_yield, self.allow_await).parse(cursor)?) |
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} else { |
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None |
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} |
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} else { |
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None |
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}; |
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Ok(Self::Output::new(param, init, false)) |
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} |
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} |
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/// A `FunctionBody` is equivalent to a `FunctionStatementList`. |
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/// |
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/// More information: |
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/// - [ECMAScript specification][spec] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#prod-FunctionBody |
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pub(in crate::syntax::parser) type FunctionBody = FunctionStatementList; |
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/// The possible TokenKind which indicate the end of a function statement. |
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const FUNCTION_BREAK_TOKENS: [TokenKind; 1] = [TokenKind::Punctuator(Punctuator::CloseBlock)]; |
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/// A function statement list |
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/// |
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/// More information: |
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/// - [ECMAScript specification][spec] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#prod-FunctionStatementList |
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#[derive(Debug, Clone, Copy)] |
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pub(in crate::syntax::parser) struct FunctionStatementList { |
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allow_yield: AllowYield, |
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allow_await: AllowAwait, |
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} |
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impl FunctionStatementList { |
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/// Creates a new `FunctionStatementList` parser. |
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pub(in crate::syntax::parser) fn new<Y, A>(allow_yield: Y, allow_await: A) -> 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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} |
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} |
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} |
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impl<R> TokenParser<R> for FunctionStatementList |
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where |
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R: Read, |
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{ |
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type Output = node::StatementList; |
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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("FunctionStatementList", "Parsing"); |
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let global_strict_mode = cursor.strict_mode(); |
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if let Some(tk) = cursor.peek(0)? { |
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match tk.kind() { |
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TokenKind::Punctuator(Punctuator::CloseBlock) => { |
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return Ok(Vec::new().into()); |
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} |
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TokenKind::StringLiteral(string) |
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| TokenKind::TemplateNoSubstitution { cooked: string, .. } => { |
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if string == &"use strict".into() { |
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cursor.set_strict_mode(true); |
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} |
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} |
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_ => {} |
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} |
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} |
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let stmlist = StatementList::new( |
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self.allow_yield, |
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self.allow_await, |
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true, |
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true, |
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&FUNCTION_BREAK_TOKENS, |
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) |
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.parse(cursor); |
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// Reset strict mode back to the global scope. |
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cursor.set_strict_mode(global_strict_mode); |
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stmlist |
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} |
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}
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