Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

refactor(parser): clean up try_parse #3925

Merged
merged 1 commit into from
Jun 26, 2024
Merged

refactor(parser): clean up try_parse #3925

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 5 additions & 3 deletions crates/oxc_parser/src/cursor.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -297,15 +297,17 @@ impl<'a> ParserImpl<'a> {
pub(crate) fn try_parse<T>(
&mut self,
func: impl FnOnce(&mut ParserImpl<'a>) -> Result<T>,
) -> Result<T> {
) -> Option<T> {
let checkpoint = self.checkpoint();
let ctx = self.ctx;
let result = func(self);
if result.is_err() {
if let Ok(result) = result {
Some(result)
} else {
self.ctx = ctx;
self.rewind(checkpoint);
None
}
result
}

pub(crate) fn lookahead<U>(&mut self, predicate: impl Fn(&mut ParserImpl<'a>) -> U) -> U {
Expand Down
2 changes: 1 addition & 1 deletion crates/oxc_parser/src/js/arrow.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -328,7 +328,7 @@ impl<'a> ParserImpl<'a> {
if self.state.not_parenthesized_arrow.contains(&pos) {
return Ok(None);
}
if let Ok((type_parameters, params, return_type, r#async, span)) =
if let Some((type_parameters, params, return_type, r#async, span)) =
self.try_parse(ParserImpl::parse_parenthesized_arrow_function_head)
{
return self
Expand Down
10 changes: 5 additions & 5 deletions crates/oxc_parser/src/js/expression.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -164,7 +164,7 @@ impl<'a> ParserImpl<'a> {
return self.parse_function_expression(span, r#async);
}

match &self.cur_kind() {
match self.cur_kind() {
Kind::Ident => self.parse_identifier_expression(), // fast path, keywords are checked at the end
// Literal, RegularExpressionLiteral
kind if kind.is_literal() => self.parse_literal_expression(),
Expand Down Expand Up @@ -530,8 +530,8 @@ impl<'a> ParserImpl<'a> {
in_optional_chain: &mut bool,
) -> Result<Expression<'a>> {
let span = self.start_span();
self.parse_primary_expression()
.and_then(|lhs| self.parse_member_expression_rest(span, lhs, in_optional_chain))
let lhs = self.parse_primary_expression()?;
self.parse_member_expression_rest(span, lhs, in_optional_chain)
}

/// Section 13.3 Super Call
Expand Down Expand Up @@ -601,7 +601,7 @@ impl<'a> ParserImpl<'a> {
self.parse_tagged_template(lhs_span, expr, *in_optional_chain, type_parameters)?
}
Kind::LAngle | Kind::ShiftLeft => {
if let Ok(Some(arguments)) =
if let Some(Some(arguments)) =
self.try_parse(Self::parse_type_arguments_in_expression)
{
lhs = self.ast.ts_instantiation_expression(
Expand Down Expand Up @@ -713,7 +713,7 @@ impl<'a> ParserImpl<'a> {
*in_optional_chain = if optional_call { true } else { *in_optional_chain };

if optional_call {
if let Ok(Some(args)) = self.try_parse(Self::parse_type_arguments_in_expression) {
if let Some(Some(args)) = self.try_parse(Self::parse_type_arguments_in_expression) {
type_arguments = Some(args);
}
if self.cur_kind().is_template_start_of_tagged_template() {
Expand Down
4 changes: 4 additions & 0 deletions crates/oxc_parser/src/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -417,6 +417,10 @@ impl<'a> ParserImpl<'a> {
self.errors.push(error);
}

fn errors_count(&self) -> usize {
self.errors.len() + self.lexer.errors.len()
}

fn ts_enabled(&self) -> bool {
self.source_type.is_typescript()
}
Expand Down
49 changes: 25 additions & 24 deletions crates/oxc_parser/src/ts/types.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -129,10 +129,11 @@ impl<'a> ParserImpl<'a> {
self.bump_any();
return true;
}
if matches!(self.cur_kind(), Kind::LBrack | Kind::LCurly)
&& self.parse_binding_pattern_kind().is_ok()
{
return true;
if matches!(self.cur_kind(), Kind::LBrack | Kind::LCurly) {
let errors_count = self.errors_count();
if self.parse_binding_pattern_kind().is_ok() && errors_count == self.errors_count() {
return true;
}
}
false
}
Expand Down Expand Up @@ -342,7 +343,7 @@ impl<'a> ParserImpl<'a> {
| Kind::Undefined
| Kind::Never
| Kind::Object => {
if let Ok(Some(ty)) = self.try_parse(Self::parse_keyword_and_no_dot) {
if let Some(ty) = self.try_parse(Self::parse_keyword_and_no_dot) {
Ok(ty)
} else {
self.parse_type_reference()
Expand Down Expand Up @@ -421,62 +422,62 @@ impl<'a> ParserImpl<'a> {
}
}

fn parse_keyword_and_no_dot(&mut self) -> Result<Option<TSType<'a>>> {
fn parse_keyword_and_no_dot(&mut self) -> Result<TSType<'a>> {
let span = self.start_span();
let ty = match self.cur_kind() {
Kind::Any => {
self.bump_any();
Some(self.ast.ts_any_keyword(self.end_span(span)))
self.ast.ts_any_keyword(self.end_span(span))
}
Kind::BigInt => {
self.bump_any();
Some(self.ast.ts_bigint_keyword(self.end_span(span)))
self.ast.ts_bigint_keyword(self.end_span(span))
}
Kind::Boolean => {
self.bump_any();
Some(self.ast.ts_boolean_keyword(self.end_span(span)))
self.ast.ts_boolean_keyword(self.end_span(span))
}
Kind::Intrinsic => {
self.bump_any();
Some(self.ast.ts_intrinsic_keyword(self.end_span(span)))
self.ast.ts_intrinsic_keyword(self.end_span(span))
}
Kind::Never => {
self.bump_any();
Some(self.ast.ts_never_keyword(self.end_span(span)))
self.ast.ts_never_keyword(self.end_span(span))
}
Kind::Null => {
self.bump_any();
Some(self.ast.ts_null_keyword(self.end_span(span)))
self.ast.ts_null_keyword(self.end_span(span))
}
Kind::Number => {
self.bump_any();
Some(self.ast.ts_number_keyword(self.end_span(span)))
self.ast.ts_number_keyword(self.end_span(span))
}
Kind::Object => {
self.bump_any();
Some(self.ast.ts_object_keyword(self.end_span(span)))
self.ast.ts_object_keyword(self.end_span(span))
}
Kind::String => {
self.bump_any();
Some(self.ast.ts_string_keyword(self.end_span(span)))
self.ast.ts_string_keyword(self.end_span(span))
}
Kind::Symbol => {
self.bump_any();
Some(self.ast.ts_symbol_keyword(self.end_span(span)))
self.ast.ts_symbol_keyword(self.end_span(span))
}
Kind::Undefined => {
self.bump_any();
Some(self.ast.ts_undefined_keyword(self.end_span(span)))
self.ast.ts_undefined_keyword(self.end_span(span))
}
Kind::Unknown => {
self.bump_any();
Some(self.ast.ts_unknown_keyword(self.end_span(span)))
self.ast.ts_unknown_keyword(self.end_span(span))
}
Kind::Void => {
self.bump_any();
Some(self.ast.ts_void_keyword(self.end_span(span)))
self.ast.ts_void_keyword(self.end_span(span))
}
_ => None,
_ => return Err(self.unexpected()),
};
if self.at(Kind::Dot) {
return Err(self.unexpected());
Expand Down Expand Up @@ -1053,11 +1054,11 @@ impl<'a> ParserImpl<'a> {
let type_predicate_variable = if self.cur_kind().is_identifier_name() {
self.try_parse(Self::parse_type_predicate_prefix)
} else {
Ok(None)
None
};
let type_span = self.start_span();
let ty = self.parse_ts_type()?;
if let Ok(Some(id)) = type_predicate_variable {
if let Some(id) = type_predicate_variable {
let type_annotation = Some(self.ast.ts_type_annotation(self.end_span(type_span), ty));
let parameter_name = self.ast.ts_type_predicate_name_identifier(id);
return Ok(self.ast.ts_type_predicate(
Expand All @@ -1070,12 +1071,12 @@ impl<'a> ParserImpl<'a> {
Ok(ty)
}

fn parse_type_predicate_prefix(&mut self) -> Result<Option<IdentifierName<'a>>> {
fn parse_type_predicate_prefix(&mut self) -> Result<IdentifierName<'a>> {
let id = self.parse_identifier_name()?;
let token = self.cur_token();
if token.kind == Kind::Is && !token.is_on_new_line {
self.bump_any();
return Ok(Some(id));
return Ok(id);
}
Err(self.unexpected())
}
Expand Down
Loading