198 lines
7.1 KiB
Rust
198 lines
7.1 KiB
Rust
use std::collections::HashMap;
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use crate::ast::{ElementClosingTag, NodeData, ScriptOrStyleLang};
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use crate::entity::decode::decode_entities;
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use crate::parse::content::{parse_content, ParsedContent};
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use crate::parse::script::parse_script_content;
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use crate::parse::style::parse_style_content;
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use crate::parse::textarea::parse_textarea_content;
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use crate::parse::title::parse_title_content;
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use crate::parse::Code;
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use crate::common::gen::codepoints::{
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ATTR_QUOTE, DOUBLE_QUOTE, NOT_UNQUOTED_ATTR_VAL_CHAR, SINGLE_QUOTE, TAG_NAME_CHAR, WHITESPACE,
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WHITESPACE_OR_SLASH, WHITESPACE_OR_SLASH_OR_EQUALS_OR_RIGHT_CHEVRON,
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};
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use crate::common::spec::script::JAVASCRIPT_MIME_TYPES;
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use crate::common::spec::tag::ns::Namespace;
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use crate::common::spec::tag::void::VOID_TAGS;
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use std::fmt::{Debug, Formatter};
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use std::str::from_utf8;
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fn parse_tag_name(code: &mut Code) -> Vec<u8> {
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debug_assert!(code.as_slice().starts_with(b"<"));
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code.shift(1);
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code.shift_if_next(b'/');
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let mut name = code.copy_and_shift_while_in_lookup(TAG_NAME_CHAR);
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name.make_ascii_lowercase();
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name
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}
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pub fn peek_tag_name(code: &mut Code) -> Vec<u8> {
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let cp = code.take_checkpoint();
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let name = parse_tag_name(code);
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code.restore_checkpoint(cp);
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name
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}
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// Derive Eq for testing.
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#[derive(Eq, PartialEq)]
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pub struct ParsedTag {
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pub attributes: HashMap<Vec<u8>, Vec<u8>>,
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pub name: Vec<u8>,
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pub self_closing: bool,
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}
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impl Debug for ParsedTag {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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f.write_fmt(format_args!("<{}", from_utf8(&self.name).unwrap()))?;
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let mut attrs = self.attributes.iter().collect::<Vec<_>>();
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attrs.sort_unstable_by(|a, b| a.0.cmp(b.0));
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for (n, v) in attrs {
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f.write_fmt(format_args!(
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" {}={}",
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from_utf8(n).unwrap(),
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from_utf8(v).unwrap()
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))?;
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}
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if self.self_closing {
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f.write_str(" />")?;
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};
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std::fmt::Result::Ok(())
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}
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}
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// While not valid, attributes in closing tags still need to be parsed (and then discarded) as attributes e.g. `</div x=">">`, which is why this function is used for both opening and closing tags.
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// TODO Use generics to create version that doesn't create a HashMap.
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pub fn parse_tag(code: &mut Code) -> ParsedTag {
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let elem_name = parse_tag_name(code);
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let mut attributes = HashMap::<Vec<u8>, Vec<u8>>::new();
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let self_closing;
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loop {
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// At the beginning of this loop, the last parsed unit was either the tag name or an attribute (including its value, if it had one).
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let last = code.shift_while_in_lookup(WHITESPACE_OR_SLASH);
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if code.at_end() || code.shift_if_next(b'>') {
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self_closing = last.filter(|&c| c == b'/').is_some();
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// End of tag.
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break;
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};
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let mut attr_name = Vec::new();
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// An attribute name can start with `=`, but ends at the next whitespace, `=`, `/`, or `>`.
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if let Some(c) = code.shift_if_next_not_in_lookup(WHITESPACE_OR_SLASH) {
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attr_name.push(c);
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};
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attr_name.extend_from_slice(
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code.slice_and_shift_while_not_in_lookup(
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WHITESPACE_OR_SLASH_OR_EQUALS_OR_RIGHT_CHEVRON,
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),
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);
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debug_assert!(!attr_name.is_empty());
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attr_name.make_ascii_lowercase();
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// See comment for WHITESPACE_OR_SLASH in codepoints.ts for details of complex attr parsing.
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code.shift_while_in_lookup(WHITESPACE);
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let has_value = code.shift_if_next(b'=');
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code.shift_while_in_lookup(WHITESPACE);
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let attr_value = if !has_value {
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Vec::new()
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} else {
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// TODO Replace ATTR_QUOTE with direct comparison.
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let attr_delim = code.shift_if_next_in_lookup(ATTR_QUOTE);
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// It seems that for unquoted attribute values, if it's the last value in a tag and is immediately followed by `>`, any trailing `/` is NOT interpreted as a self-closing indicator and is always included as part of the value, even for SVG self-closable elements.
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let attr_delim_pred = match attr_delim {
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Some(b'"') => DOUBLE_QUOTE,
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Some(b'\'') => SINGLE_QUOTE,
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None => NOT_UNQUOTED_ATTR_VAL_CHAR,
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_ => unreachable!(),
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};
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let attr_value = decode_entities(
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code.slice_and_shift_while_not_in_lookup(attr_delim_pred),
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true,
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);
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if let Some(c) = attr_delim {
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// It might not be next if EOF (i.e. attribute value not closed).
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code.shift_if_next(c);
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};
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attr_value
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};
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attributes.insert(attr_name, attr_value);
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}
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ParsedTag {
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attributes,
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name: elem_name,
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self_closing,
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}
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}
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// `<` or `</` must be next. If `</` is next, tag is reinterpreted as opening tag (i.e. `/` is ignored).
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// `parent` should be an empty slice if it doesn't exist.
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pub fn parse_element(code: &mut Code, ns: Namespace, parent: &[u8]) -> NodeData {
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let ParsedTag {
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name: elem_name,
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attributes,
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self_closing,
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} = parse_tag(code);
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// Only foreign elements can be self closed.
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if self_closing && ns != Namespace::Html {
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return NodeData::Element {
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attributes,
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children: Vec::new(),
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closing_tag: ElementClosingTag::SelfClosing,
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name: elem_name,
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namespace: ns,
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next_sibling_element_name: Vec::new(),
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};
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};
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if VOID_TAGS.contains(elem_name.as_slice()) {
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return NodeData::Element {
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attributes,
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children: Vec::new(),
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closing_tag: ElementClosingTag::Void,
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name: elem_name,
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namespace: ns,
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next_sibling_element_name: Vec::new(),
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};
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};
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// TODO Is "svg" itself in the SVG namespace? Does it matter?
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// If it is and does, we need to update `namespace:` property of this function's return values.
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let child_ns = if elem_name == b"svg" {
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Namespace::Svg
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} else {
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ns
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};
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let ParsedContent {
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closing_tag_omitted,
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children,
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} = match elem_name.as_slice() {
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b"script" => match attributes.get(b"type".as_ref()) {
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Some(mime) if !JAVASCRIPT_MIME_TYPES.contains(mime.as_slice()) => {
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parse_script_content(code, ScriptOrStyleLang::Data)
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}
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_ => parse_script_content(code, ScriptOrStyleLang::JS),
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},
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b"style" => parse_style_content(code),
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b"textarea" => parse_textarea_content(code),
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b"title" => parse_title_content(code),
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_ => parse_content(code, child_ns, parent, &elem_name),
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};
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if !closing_tag_omitted {
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let closing_tag = parse_tag(code);
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debug_assert_eq!(closing_tag.name, elem_name);
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};
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NodeData::Element {
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attributes,
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children,
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closing_tag: if closing_tag_omitted {
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ElementClosingTag::Omitted
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} else {
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ElementClosingTag::Present
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},
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name: elem_name,
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namespace: ns,
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next_sibling_element_name: Vec::new(),
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}
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}
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