66 lines
2.7 KiB
Rust
66 lines
2.7 KiB
Rust
use crate::err::ProcessingResult;
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use crate::proc::checkpoint::WriteCheckpoint;
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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::unit::attr::value::{DelimiterType, process_attr_value, ProcessedAttrValue, skip_attr_value};
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use crate::gen::attrs::ATTRS;
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use crate::spec::tag::ns::Namespace;
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use crate::gen::codepoints::{ATTR_NAME_CHAR, WHITESPACE};
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mod value;
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub enum AttrType {
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Quoted,
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Unquoted,
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NoValue,
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}
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pub struct ProcessedAttr {
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pub name: ProcessorRange,
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pub typ: AttrType,
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pub value: Option<ProcessorRange>,
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}
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pub fn process_attr(proc: &mut Processor, ns: Namespace, element: ProcessorRange) -> ProcessingResult<ProcessedAttr> {
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// It's possible to expect attribute name but not be called at an attribute, e.g. due to whitespace between name and
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// value, which causes name to be considered boolean attribute and `=` to be start of new (invalid) attribute name.
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let name = proc.m(WhileInLookup(ATTR_NAME_CHAR), Keep).require("attribute name")?;
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proc.make_lowercase(name);
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let attr_cfg = ATTRS.get(ns, &proc[element], &proc[name]);
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let is_boolean = attr_cfg.filter(|attr| attr.boolean).is_some();
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let after_name = WriteCheckpoint::new(proc);
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let should_collapse_and_trim_value_ws = attr_cfg.filter(|attr| attr.collapse_and_trim).is_some();
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proc.m(WhileInLookup(WHITESPACE), Discard);
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let has_value = proc.m(IsChar(b'='), Keep).nonempty();
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let (typ, value) = if !has_value {
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(AttrType::NoValue, None)
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} else {
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proc.m(WhileInLookup(WHITESPACE), Discard);
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if is_boolean {
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skip_attr_value(proc)?;
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// Discard `=`.
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debug_assert_eq!(after_name.written_count(proc), 1);
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after_name.erase_written(proc);
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(AttrType::NoValue, None)
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} else {
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match process_attr_value(proc, should_collapse_and_trim_value_ws)? {
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ProcessedAttrValue { value: None, .. } => {
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// Value is empty, which is equivalent to no value, so discard `=`.
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debug_assert_eq!(after_name.written_count(proc), 1);
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after_name.erase_written(proc);
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(AttrType::NoValue, None)
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}
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ProcessedAttrValue { delimiter: DelimiterType::Unquoted, value } => (AttrType::Unquoted, value),
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ProcessedAttrValue { delimiter: DelimiterType::Double, value } | ProcessedAttrValue { delimiter: DelimiterType::Single, value } => (AttrType::Quoted, value),
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}
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}
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};
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Ok(ProcessedAttr { name, typ, value })
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}
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