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perf(html/parser): Apply small memory optimizations (#5345)

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Alexander Akait 2022-08-01 07:49:58 +03:00 committed by GitHub
parent 9414e495af
commit 2a499de61d
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1 changed files with 23 additions and 19 deletions
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42
crates/swc_html_parser/src/lexer/mod.rs
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@ -566,9 +566,9 @@ where
fn create_start_tag_token(&mut self) {
self.current_tag_token = Some(Tag {
kind: TagKind::Start,
// Maximum known html tags are `blockquote` and `figcaption`
tag_name: String::with_capacity(10),
raw_tag_name: Some(String::with_capacity(10)),
// Maximum known tag is `feComponentTransfer` (SVG)
tag_name: String::with_capacity(19),
raw_tag_name: Some(String::with_capacity(19)),
is_self_closing: false,
attributes: Vec::with_capacity(255),
});
@ -577,9 +577,9 @@ where
fn create_end_tag_token(&mut self) {
self.current_tag_token = Some(Tag {
kind: TagKind::End,
// Maximum known html tags are `blockquote` and `figcaption`
tag_name: String::with_capacity(10),
raw_tag_name: Some(String::with_capacity(10)),
// Maximum known tag is `feComponentTransfer` (SVG)
tag_name: String::with_capacity(19),
raw_tag_name: Some(String::with_capacity(19)),
is_self_closing: false,
attributes: Vec::with_capacity(255),
});
@ -599,9 +599,9 @@ where
fn start_new_attribute(&mut self, c: Option<char>) {
if let Some(Tag { attributes, .. }) = &mut self.current_tag_token {
// The longest known HTML attribute is "allowpaymentrequest" for "iframe".
let mut name = String::with_capacity(19);
let mut raw_name = String::with_capacity(19);
// The longest known attribute is "glyph-orientation-horizontal" for SVG tags
let mut name = String::with_capacity(28);
let mut raw_name = String::with_capacity(28);
if let Some(c) = c {
name.push(c);
@ -689,7 +689,7 @@ where
TagKind::Start => {
self.last_start_tag_name = Some(current_tag_token.tag_name.clone().into());
let mut already_seen: AHashSet<String> = Default::default();
let mut already_seen: AHashSet<JsWord> = Default::default();
let start_tag_token = Token::StartTag {
tag_name: current_tag_token.tag_name.into(),
@ -699,18 +699,20 @@ where
.attributes
.drain(..)
.map(|attribute| {
if already_seen.contains(&attribute.name) {
let name: JsWord = JsWord::from(attribute.name);
if already_seen.contains(&name) {
self.errors.push(Error::new(
attribute.span,
ErrorKind::DuplicateAttribute,
));
}
already_seen.insert(attribute.name.clone());
already_seen.insert(name.clone());
AttributeToken {
span: attribute.span,
name: attribute.name.into(),
name,
raw_name: attribute.raw_name.map(JsWord::from),
value: attribute.value.map(JsWord::from),
raw_value: attribute.raw_value.map(JsWord::from),
@ -730,7 +732,7 @@ where
self.emit_error(ErrorKind::EndTagWithTrailingSolidus);
}
let mut already_seen: AHashSet<String> = Default::default();
let mut already_seen: AHashSet<JsWord> = Default::default();
let end_tag_token = Token::EndTag {
tag_name: current_tag_token.tag_name.into(),
@ -740,18 +742,20 @@ where
.attributes
.drain(..)
.map(|attribute| {
if already_seen.contains(&attribute.name) {
let name: JsWord = JsWord::from(attribute.name);
if already_seen.contains(&name) {
self.errors.push(Error::new(
attribute.span,
ErrorKind::DuplicateAttribute,
));
}
already_seen.insert(attribute.name.clone());
already_seen.insert(name.clone());
AttributeToken {
span: attribute.span,
name: attribute.name.into(),
name,
raw_name: attribute.raw_name.map(JsWord::from),
value: attribute.value.map(JsWord::from),
raw_value: attribute.raw_value.map(JsWord::from),
@ -767,8 +771,8 @@ where
}
fn create_comment_token(&mut self, new_data: Option<String>, raw_start: &str) {
let mut data = String::with_capacity(32);
let mut raw = String::with_capacity(38);
let mut data = String::with_capacity(64);
let mut raw = String::with_capacity(71);
raw.push_str(raw_start);