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util.rs
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util.rs
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use std::ops::{Deref, DerefMut};
use swc_common::{Span, Spanned, SyntaxContext, DUMMY_SP};
use swc_css_ast::*;
use super::{
input::{Input, InputType, ParserInput},
Ctx, Error, PResult, Parse, Parser,
};
impl<I> Parser<I>
where
I: ParserInput,
{
/// Original context is restored when returned guard is dropped.
#[inline]
pub(super) fn with_ctx(&mut self, ctx: Ctx) -> WithCtx<I> {
let orig_ctx = self.ctx;
self.ctx = ctx;
WithCtx {
orig_ctx,
inner: self,
}
}
#[inline]
pub(super) fn parse_as<T>(&mut self) -> PResult<T>
where
Self: Parse<T>,
{
self.parse()
}
pub(super) fn try_parse<Ret>(
&mut self,
op: impl FnOnce(&mut Parser<I>) -> PResult<Ret>,
) -> Option<Ret> {
let mut parser = self.clone();
match op(&mut parser) {
Ok(v) => {
*self = parser;
Some(v)
}
Err(..) => None,
}
}
pub(super) fn create_locv(&self, children: Vec<ComponentValue>) -> ListOfComponentValues {
let span = match (children.first(), children.last()) {
(Some(first), Some(last)) => {
Span::new(first.span_lo(), last.span_hi(), SyntaxContext::empty())
}
_ => DUMMY_SP,
};
ListOfComponentValues { span, children }
}
pub(super) fn parse_according_to_grammar<T>(
&mut self,
list_of_component_values: &ListOfComponentValues,
op: impl FnOnce(&mut Parser<Input>) -> PResult<T>,
) -> PResult<T> {
let lexer = Input::new(InputType::ListOfComponentValues(list_of_component_values));
let mut parser = Parser::new(lexer, self.config);
let res = op(&mut parser.with_ctx(self.ctx));
self.errors.extend(parser.take_errors());
res
}
pub(super) fn try_to_parse_legacy_nesting(&mut self) -> Option<QualifiedRule> {
let state = self.input.state();
let qualified_rule = self
.with_ctx(Ctx {
mixed_with_declarations: true,
..self.ctx
})
.parse_as::<QualifiedRule>();
match qualified_rule {
Ok(qualified_rule) => Some(qualified_rule),
_ => {
self.input.reset(&state);
None
}
}
}
pub(super) fn try_to_parse_declaration_in_parens(&mut self) -> Option<Declaration> {
let mut temporary_list = ListOfComponentValues {
span: Default::default(),
children: vec![],
};
while !is_one_of!(self, ")", EOF) {
let component_value = match self.parse_as::<ComponentValue>() {
Ok(component_value) => component_value,
Err(_) => return None,
};
temporary_list.children.push(component_value);
}
match self
.parse_according_to_grammar::<Declaration>(&temporary_list, |parser| parser.parse_as())
{
Ok(decl) => Some(decl),
Err(_) => None,
}
}
}
pub(super) struct WithCtx<'w, I: 'w + ParserInput> {
inner: &'w mut Parser<I>,
orig_ctx: Ctx,
}
impl<'w, I: ParserInput> Deref for WithCtx<'w, I> {
type Target = Parser<I>;
fn deref(&self) -> &Parser<I> {
self.inner
}
}
impl<'w, I: ParserInput> DerefMut for WithCtx<'w, I> {
fn deref_mut(&mut self) -> &mut Parser<I> {
self.inner
}
}
impl<'w, I: ParserInput> Drop for WithCtx<'w, I> {
fn drop(&mut self) {
self.inner.ctx = self.orig_ctx;
}
}