103 lines
3.5 KiB
Rust
103 lines
3.5 KiB
Rust
use std::collections::HashMap;
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use crate::ast::{ElementClosingTag, NodeData};
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use crate::cfg::Cfg;
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use crate::minify::attr::{minify_attr, AttrMinified};
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use crate::minify::content::minify_content;
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use crate::spec::tag::ns::Namespace;
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use crate::spec::tag::omission::{can_omit_as_before, can_omit_as_last_node};
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#[derive(Copy, Clone, Eq, PartialEq)]
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enum LastAttr {
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NoValue,
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Quoted,
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Unquoted,
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}
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pub fn minify_element(
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cfg: &Cfg,
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out: &mut Vec<u8>,
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descendant_of_pre: bool,
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ns: Namespace,
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// Use an empty slice if none.
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parent: &[u8],
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// Use an empty slice if the next element or text sibling node is not an element.
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next_sibling_as_element_tag_name: &[u8],
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// If the last node of the parent is an element and it's this one.
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is_last_child_text_or_element_node: bool,
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tag_name: &[u8],
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attributes: HashMap<Vec<u8>, Vec<u8>>,
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closing_tag: ElementClosingTag,
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children: Vec<NodeData>,
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) {
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let can_omit_opening_tag = (tag_name == b"html" || tag_name == b"head")
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&& attributes.is_empty()
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&& !cfg.keep_html_and_head_opening_tags;
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let can_omit_closing_tag = !cfg.keep_closing_tags
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&& (can_omit_as_before(tag_name, next_sibling_as_element_tag_name)
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|| (is_last_child_text_or_element_node && can_omit_as_last_node(parent, tag_name)));
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// TODO Attributes list could become empty after minification, making opening tag eligible for omission again.
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if !can_omit_opening_tag {
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out.push(b'<');
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out.extend_from_slice(tag_name);
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let mut last_attr = LastAttr::NoValue;
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// TODO Further optimisation: order attrs based on optimal spacing strategy, given that spaces can be omitted after quoted attrs, and maybe after the tag name?
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let mut attrs_sorted = attributes.into_iter().collect::<Vec<_>>();
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attrs_sorted.sort_unstable_by(|a, b| a.0.cmp(&b.0));
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for (name, value) in attrs_sorted {
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let min = minify_attr(cfg, ns, tag_name, &name, value);
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if let AttrMinified::Redundant = min {
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continue;
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};
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if cfg.keep_spaces_between_attributes || last_attr != LastAttr::Quoted {
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out.push(b' ');
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};
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out.extend_from_slice(&name);
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match min {
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AttrMinified::NoValue => {
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last_attr = LastAttr::NoValue;
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}
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AttrMinified::Value(v) => {
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debug_assert!(v.len() > 0);
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out.push(b'=');
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v.out(out);
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last_attr = if v.quoted() {
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LastAttr::Quoted
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} else {
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LastAttr::Unquoted
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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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if closing_tag == ElementClosingTag::SelfClosing {
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if last_attr == LastAttr::Unquoted {
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out.push(b' ');
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};
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out.push(b'/');
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};
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out.push(b'>');
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}
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if closing_tag == ElementClosingTag::SelfClosing || closing_tag == ElementClosingTag::Void {
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debug_assert!(children.is_empty());
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return;
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};
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minify_content(
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cfg,
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out,
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descendant_of_pre || (ns == Namespace::Html && tag_name == b"pre"),
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tag_name,
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children,
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);
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if closing_tag != ElementClosingTag::Present || can_omit_closing_tag {
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return;
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};
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out.extend_from_slice(b"</");
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out.extend_from_slice(tag_name);
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out.push(b'>');
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}
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