174 lines
7.3 KiB
Rust
174 lines
7.3 KiB
Rust
use crate::err::ProcessingResult;
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use crate::proc::MatchAction::*;
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use crate::proc::MatchMode::*;
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use crate::proc::Processor;
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use crate::proc::range::ProcessorRange;
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use crate::proc::uep::UnintentionalEntityPrevention;
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use crate::spec::codepoint::is_whitespace;
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use crate::spec::tag::omission::CLOSING_TAG_OMISSION_RULES;
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use crate::spec::tag::whitespace::{get_whitespace_minification_for_tag, WhitespaceMinification};
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use crate::unit::bang::process_bang;
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use crate::unit::comment::process_comment;
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use crate::unit::entity::{EntityType, parse_entity};
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use crate::unit::instruction::process_instruction;
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use crate::unit::tag::{MaybeClosingTag, Namespace, process_tag};
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#[derive(Copy, Clone, PartialEq, Eq)]
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enum ContentType {
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Comment,
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Bang,
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Instruction,
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Tag,
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Start,
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End,
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Entity,
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Text,
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}
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impl ContentType {
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fn is_tag_like(&self) -> bool {
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// Do not include Comment as comments are not written.
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match self {
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ContentType::Bang | ContentType::Instruction | ContentType::Tag => true,
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_ => false,
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}
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}
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fn peek(proc: &mut Processor) -> ContentType {
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// Manually write out matching for fast performance as this is hot spot; don't use generated trie.
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match proc.peek(0) {
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None => ContentType::End,
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Some(b'<') => match proc.peek(1) {
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Some(b'/') => ContentType::End,
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Some(b'?') => ContentType::Instruction,
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Some(b'!') => match proc.peek_many(2, 2) {
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Some(b"--") => ContentType::Comment,
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_ => ContentType::Bang,
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},
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_ => ContentType::Tag
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},
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Some(b'&') => ContentType::Entity,
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Some(_) => ContentType::Text,
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}
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}
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}
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pub fn process_content(proc: &mut Processor, ns: Namespace, parent: Option<ProcessorRange>) -> ProcessingResult<()> {
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let &WhitespaceMinification { collapse, destroy_whole, trim } = get_whitespace_minification_for_tag(parent.map(|r| &proc[r]));
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let handle_ws = collapse || destroy_whole || trim;
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let mut last_written = ContentType::Start;
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// Whether or not currently in whitespace.
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let mut ws_skipped = false;
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let mut prev_sibling_closing_tag = MaybeClosingTag::none();
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// TODO Comment.
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let uep = &mut UnintentionalEntityPrevention::new(proc, true);
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loop {
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// Do not write anything until any previously ignored whitespace has been processed later.
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let next_content_type = ContentType::peek(proc);
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let entity: Option<EntityType> = match next_content_type {
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ContentType::Comment => {
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// Comments are completely ignored and do not affect anything (previous element node's closing tag, unintentional entities, whitespace, etc.).
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process_comment(proc)?;
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continue;
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}
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ContentType::Entity => Some(parse_entity(proc)?),
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_ => None,
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};
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if handle_ws {
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// If any of these arms match, this is the start or part of one or more whitespace characters.
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// Simply ignore and process until first non-whitespace.
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if match (next_content_type, entity) {
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(_, Some(EntityType::Ascii(c))) if is_whitespace(c) => true,
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(ContentType::Text, _) => proc.m(IsPred(is_whitespace), Discard).nonempty(),
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_ => false,
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} {
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ws_skipped = true;
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continue;
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};
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// Next character is not whitespace, so handle any previously ignored whitespace.
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if ws_skipped {
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if destroy_whole && last_written.is_tag_like() && next_content_type.is_tag_like() {
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// Whitespace is between two tags, instructions, or bangs.
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// `destroy_whole` is on, so don't write it.
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} else if trim && (last_written == ContentType::Start || next_content_type == ContentType::End) {
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// Whitespace is leading or trailing.
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// `trim` is on, so don't write it.
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} else if collapse {
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// If writing space, then prev_sibling_closing_tag no longer represents immediate previous sibling node; space will be new previous sibling node (as a text node).
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uep_ignore!(uep, proc, {
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prev_sibling_closing_tag.write_if_exists(proc);
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});
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// Current contiguous whitespace needs to be reduced to a single space character.
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proc.write(b' ');
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last_written = ContentType::Text;
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} else {
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unreachable!();
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};
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// Reset whitespace marker.
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ws_skipped = false;
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};
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};
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// Process and consume next character(s).
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match next_content_type {
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ContentType::Tag => {
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// Always resume UEP as closing tag might not exist or be omitted.
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uep_ignore!(uep, proc, {
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let new_closing_tag = process_tag(proc, ns, prev_sibling_closing_tag)?;
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prev_sibling_closing_tag.replace(new_closing_tag);
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});
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}
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ContentType::End => {
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uep.end(proc);
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if prev_sibling_closing_tag.exists_and(|prev_tag|
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CLOSING_TAG_OMISSION_RULES
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.get(&proc[prev_tag])
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.filter(|rule| rule.can_omit_as_last_node(parent.map(|p| &proc[p])))
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.is_none()
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) {
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prev_sibling_closing_tag.write(proc);
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};
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break;
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}
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content_type => {
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// Immediate next sibling node is not an element, so write any immediate previous sibling element's closing tag.
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// UEP is resumed after processing a tag and setting `prev_sibling_closing_tag` (see ContentType::Tag arm), so suspend it before writing any closing tag (even though nothing should've been written since tag was processed and `prev_sibling_closing_tag` was set).
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if prev_sibling_closing_tag.exists() {
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uep_ignore!(uep, proc, {
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prev_sibling_closing_tag.write(proc);
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});
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};
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match content_type {
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ContentType::Bang | ContentType::Instruction => uep_ignore!(uep, proc, {
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match content_type {
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ContentType::Bang => { process_bang(proc)?; }
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ContentType::Instruction => { process_instruction(proc)?; }
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_ => unreachable!(),
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};
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}),
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ContentType::Entity | ContentType::Text => uep_process!(uep, proc, {
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match entity {
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Some(entity) => { entity.keep(proc); }
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// Is text.
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None => { proc.accept()?; }
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};
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}),
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_ => unreachable!(),
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};
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}
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};
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// This should not be reached if ContentType::{Comment, End}.
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last_written = next_content_type;
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};
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Ok(())
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}
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