222 lines
7.8 KiB
Rust
222 lines
7.8 KiB
Rust
use lazy_static::lazy_static;
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use std::collections::HashSet;
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use crate::err::{ErrorType, ProcessingResult};
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use crate::proc::checkpoint::Checkpoint;
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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::spec::tag::omission::CLOSING_TAG_OMISSION_RULES;
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use crate::spec::tag::void::VOID_TAGS;
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use crate::unit::attr::{AttrType, process_attr, ProcessedAttr};
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use crate::unit::content::process_content;
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use crate::unit::script::process_script;
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use crate::unit::style::process_style;
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use crate::gen::attrs::{ATTRS, AttributeMinification};
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use crate::spec::tag::ns::Namespace;
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use crate::gen::codepoints::{TAG_NAME_CHAR, WHITESPACE};
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use crate::cfg::Cfg;
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lazy_static! {
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pub static ref JAVASCRIPT_MIME_TYPES: HashSet<&'static [u8]> = {
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let mut s = HashSet::<&'static [u8]>::new();
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s.insert(b"application/ecmascript");
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s.insert(b"application/javascript");
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s.insert(b"application/x-ecmascript");
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s.insert(b"application/x-javascript");
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s.insert(b"text/ecmascript");
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s.insert(b"text/javascript");
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s.insert(b"text/javascript1.0");
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s.insert(b"text/javascript1.1");
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s.insert(b"text/javascript1.2");
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s.insert(b"text/javascript1.3");
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s.insert(b"text/javascript1.4");
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s.insert(b"text/javascript1.5");
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s.insert(b"text/jscript");
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s.insert(b"text/livescript");
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s.insert(b"text/x-ecmascript");
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s.insert(b"text/x-javascript");
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s
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};
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}
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#[derive(Copy, Clone)]
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enum TagType {
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Script,
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Style,
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Other,
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}
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#[derive(Copy, Clone)]
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pub struct MaybeClosingTag(Option<ProcessorRange>);
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impl MaybeClosingTag {
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pub fn none() -> MaybeClosingTag {
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MaybeClosingTag(None)
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}
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#[inline(always)]
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pub fn write(&mut self, proc: &mut Processor) -> () {
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proc.write_slice(b"</");
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proc.write_range(self.0.take().unwrap());
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proc.write(b'>');
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}
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#[inline(always)]
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pub fn write_if_exists(&mut self, proc: &mut Processor) -> bool {
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self.0.take().filter(|tag| {
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proc.write_slice(b"</");
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proc.write_range(*tag);
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proc.write(b'>');
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true
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}).is_some()
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}
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#[inline(always)]
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pub fn exists(&self) -> bool {
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self.0.is_some()
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}
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#[inline(always)]
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pub fn exists_and<F: FnOnce(ProcessorRange) -> bool>(&self, pred: F) -> bool {
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match self.0 {
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Some(range) => pred(range),
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None => false,
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}
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}
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#[inline(always)]
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pub fn replace(&mut self, tag: MaybeClosingTag) -> () {
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self.0 = tag.0;
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}
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}
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// TODO Comment param `prev_sibling_closing_tag`.
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pub fn process_tag(proc: &mut Processor, cfg: &Cfg, ns: Namespace, mut prev_sibling_closing_tag: MaybeClosingTag) -> ProcessingResult<MaybeClosingTag> {
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// Expect to be currently at an opening tag.
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proc.m(IsChar(b'<'), Discard).expect();
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// May not be valid tag name at current position, so require instead of expect.
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let source_tag_name = proc.m(WhileInLookup(TAG_NAME_CHAR), Discard).require("tag name")?;
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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_before(&proc[source_tag_name]))
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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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// Write initially skipped left chevron.
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proc.write(b'<');
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// Write previously skipped name and use written code as range (otherwise source code will eventually be overwritten).
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let tag_name = proc.write_range(source_tag_name);
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let tag_type = match &proc[tag_name] {
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b"script" => TagType::Script,
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b"style" => TagType::Style,
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_ => TagType::Other,
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};
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let mut last_attr_type: Option<AttrType> = None;
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let mut self_closing = false;
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let is_void_tag = VOID_TAGS.contains(&proc[tag_name]);
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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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proc.m(WhileInLookup(WHITESPACE), Discard);
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if proc.m(IsChar(b'>'), Keep).nonempty() {
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// End of tag.
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break;
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}
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// Don't write self closing "/>" as it could be shortened to ">" if void tag.
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self_closing = proc.m(IsSeq(b"/>"), Discard).nonempty();
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if self_closing {
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break;
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}
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// Mark attribute start in case we want to erase it completely.
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let attr_checkpoint = Checkpoint::new(proc);
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let mut erase_attr = false;
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// Write space after tag name or unquoted/valueless attribute.
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// Don't write after quoted.
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// Handle rare case where file ends in opening tag before an attribute and no minification has been done yet,
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// e.g. `<-` (yes, that's the entire file).
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if proc.at_end() {
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return Err(ErrorType::UnexpectedEnd);
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};
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match last_attr_type {
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Some(AttrType::Unquoted) | Some(AttrType::NoValue) | None => proc.write(b' '),
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_ => {}
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};
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let ProcessedAttr { name, typ, value } = process_attr(proc, ns, tag_name)?;
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match (tag_type, &proc[name]) {
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(TagType::Script, b"type") => {
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// It's JS if the value is empty or one of `JAVASCRIPT_MIME_TYPES`.
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let script_tag_type_is_js = value
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.filter(|v| !JAVASCRIPT_MIME_TYPES.contains(&proc[*v]))
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.is_none();
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if script_tag_type_is_js {
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erase_attr = true;
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};
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}
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(_, name) => {
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// TODO Check if HTML tag before checking if attribute removal applies to all elements.
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erase_attr = match (value, ATTRS.get(ns, &proc[tag_name], name)) {
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(None, Some(AttributeMinification { redundant_if_empty: true, .. })) => true,
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(Some(val), Some(AttributeMinification { default_value: Some(defval), .. })) => proc[val].eq(*defval),
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_ => false,
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};
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}
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};
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if erase_attr {
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attr_checkpoint.erase_written(proc);
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} else {
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last_attr_type = Some(typ);
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};
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};
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// TODO Self closing does not actually close for HTML elements, but might close for foreign elements.
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// See spec for more details.
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if self_closing || is_void_tag {
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if self_closing {
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// Write discarded tag closing characters.
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if is_void_tag {
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proc.write_slice(b">");
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} else {
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if let Some(AttrType::Unquoted) = last_attr_type {
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// Prevent `/` from being part of the value.
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proc.write(b' ');
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};
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proc.write_slice(b"/>");
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};
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};
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return Ok(MaybeClosingTag(None));
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};
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let child_ns = if proc[tag_name].eq(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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match tag_type {
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TagType::Script => process_script(proc, cfg)?,
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TagType::Style => process_style(proc)?,
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_ => process_content(proc, cfg, child_ns, Some(tag_name))?,
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};
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// Require closing tag for non-void.
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proc.m(IsSeq(b"</"), Discard).require("closing tag")?;
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let closing_tag = proc.m(WhileInLookup(TAG_NAME_CHAR), Discard).require("closing tag name")?;
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// We need to check closing tag matches as otherwise when we later write closing tag, it might be longer than source closing tag and cause source to be overwritten.
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if !proc[closing_tag].eq(&proc[tag_name]) {
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return Err(ErrorType::ClosingTagMismatch);
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};
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proc.m(WhileInLookup(WHITESPACE), Discard);
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proc.m(IsChar(b'>'), Discard).require("closing tag end")?;
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Ok(MaybeClosingTag(Some(tag_name)))
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}
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