80 lines
2.6 KiB
Rust
80 lines
2.6 KiB
Rust
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use crate::proc::attr::{AttrType, process_attr};
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use crate::err::{HbRes, HbErr};
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use crate::proc::Processor;
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use crate::spec::codepoint::{is_alphanumeric, is_whitespace};
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use crate::proc::content::process_content;
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use crate::proc::script::process_script;
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use crate::proc::style::process_style;
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use crate::spec::tag::void::VOID_TAGS;
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use crate::code::Code;
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// Tag names may only use ASCII alphanumerics. However, some people also use `:` and `-`.
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// See https://html.spec.whatwg.org/multipage/syntax.html#syntax-tag-name for spec.
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fn is_valid_tag_name_char(c: u8) -> bool {
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is_alphanumeric(c) || c == b':' || c == b'-'
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}
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fn process_tag_name<'d, D: Code>(proc: &Processor<'d, D>) -> HbRes<&'d [u8]> {
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Ok(proc.while_pred(is_valid_tag_name_char).require_reason("tag name")?.accept().slice())
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}
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pub fn process_tag<D: Code>(proc: &Processor<D>, parent: Option<&[u8]>) -> HbRes<()> {
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proc.is('<').require().accept();
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let name = process_tag_name(proc)?;
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let mut last_attr_type = AttrType::None;
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let mut self_closing = false;
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loop {
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// At the beginning of this loop, the last parsed unit was
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// either the tag name or an attribute (including its value, if
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// it had one).
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let ws_accepted = proc.match_while_pred(is_whitespace).discard().count();
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if proc.match_char(b'>').keep().matched() {
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// End of tag.
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break;
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}
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if self_closing = proc.match_seq(b"/>").keep().matched() {
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break;
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}
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// HB_ERR_PARSE_NO_SPACE_BEFORE_ATTR is not suppressible as
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// otherwise there would be difficulty in determining what is
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// the end of a tag/attribute name/attribute value.
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if !ws_accepted {
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return Err(HbErr::NoSpaceBeforeAttr);
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}
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if last_attr_type != AttrType::Quoted {
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proc.write(b' ');
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}
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last_attr_type = process_attr(proc)?;
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}
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if self_closing || VOID_TAGS.contains(&name) {
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return Ok(());
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}
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// TODO WARNING: Tags must be case sensitive.
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match name {
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b"script" => process_script(proc)?,
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b"style" => process_style(proc)?,
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_ => process_content(proc, Some(name))?,
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}
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// Require closing tag for non-void.
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proc.match_seq(b"</").require_with_reason("closing tag")?.keep();
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let closing_name = process_tag_name(proc)?;
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if name != closing_name {
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// TODO Find a way to cleanly provide opening and closing tag
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// names (which are views) into error message without leaking
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// memory.
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return Err(HbErr::UnclosedTag);
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}
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proc.match_char(b'>').require_with_reason("closing tag")?.keep();
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Ok(())
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}
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