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// Copyright 2019 Fredrik Portström <https://portstrom.com>
// This is free software distributed under the terms specified in
// the file LICENSE at the top-level directory of this distribution.
pub fn parse_comment(state: &mut crate::State) {
let start_position = state.scan_position;
let mut position = start_position;
state.flush(position);
position += 4;
while let Some(character) = state.get_byte(position) {
match character {
b'-' if state.get_byte(position + 1) == Some(b'-')
&& state.get_byte(position + 2) == Some(b'>') =>
{
position += 3;
break;
}
b'<' if state.get_byte(position + 1) == Some(b'/') => {
if parse_end_tag(state, start_position, position) {
return;
}
position += 2;
continue;
}
_ => {}
}
position += 1;
}
state.flushed_position = position;
state.scan_position = position;
state.nodes.push(crate::Node::Comment {
end: state.scan_position,
start: start_position,
});
}
fn parse_end_tag(
state: &mut crate::State,
comment_start_position: usize,
tag_start_position: usize,
) -> bool {
let tag_name_start_position = tag_start_position + 2;
let mut tag_name_end_position = tag_name_start_position;
let tag_end_position = loop {
match state.get_byte(tag_name_end_position) {
None | Some(b'/') | Some(b'<') => return false,
Some(b'\t') | Some(b'\n') | Some(b' ') => {
let tag_end_position = state.skip_whitespace_forwards(tag_name_end_position + 1);
match state.get_byte(tag_end_position) {
Some(b'>') => break tag_end_position,
_ => return false,
}
}
Some(b'>') => break tag_name_end_position,
_ => tag_name_end_position += 1,
}
} + 1;
let tag_name = &state.wiki_text[tag_name_start_position..tag_name_end_position];
let tag_name = if tag_name.as_bytes().iter().all(u8::is_ascii_lowercase) {
crate::Cow::Borrowed(tag_name)
} else {
tag_name.to_ascii_lowercase().into()
};
let mut matched_node_index = None;
for (open_node_index, open_node) in state.stack.iter().enumerate().rev() {
if let crate::OpenNodeType::Tag { name, .. } = &open_node.type_ {
if name == &tag_name {
matched_node_index = Some(open_node_index);
break;
}
}
}
match matched_node_index {
None => false,
Some(open_node_index) => {
if open_node_index < state.stack.len() - 1 {
state.warnings.push(crate::Warning {
end: tag_end_position,
message: crate::WarningMessage::MissingEndTagRewinding,
start: tag_start_position,
});
state.stack.truncate(open_node_index + 2);
let open_node = state.stack.pop().unwrap();
state.rewind(open_node.nodes, open_node.start);
} else {
state.warnings.push(crate::Warning {
end: tag_end_position,
message: crate::WarningMessage::EndTagInComment,
start: tag_start_position,
});
state.nodes.push(crate::Node::Comment {
end: tag_start_position,
start: comment_start_position,
});
let open_node = state.stack.pop().unwrap();
state.flushed_position = tag_end_position;
state.scan_position = state.flushed_position;
let nodes = std::mem::replace(&mut state.nodes, open_node.nodes);
state.nodes.push(crate::Node::Tag {
end: state.scan_position,
name: tag_name,
nodes,
start: open_node.start,
});
}
true
}
}
}
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