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use crate::{
CHARDATA_CHUNK_LENGTH, ParserSpec,
error::XMLError,
sax::{error::fatal_error, handler::SAXHandler, parser::XMLReader, source::InputSource},
};
impl<'a, Spec: ParserSpec<Reader = InputSource<'a>>, H: SAXHandler> XMLReader<Spec, H> {
/// ```text
/// [14] CharData ::= [^<&]* - ([^<&]* ']]>' [^<&]*)
/// ```
pub(crate) fn parse_char_data(&mut self) -> Result<(), XMLError> {
self.grow()?;
if self.source.content_bytes().is_empty() {
return Ok(());
}
let mut buffer = String::new();
let mut non_whitespace = 0usize;
'outer: loop {
while !self.source.content_bytes().is_empty()
&& !matches!(self.source.content_bytes()[0], b'<' | b'&')
{
match self.source.next_char()? {
Some('\r') => {
if self.source.peek_char()? != Some('\n') {
self.locator.update_line(|l| l + 1);
self.locator.set_column(1);
buffer.push('\n');
}
}
Some('\n') => {
self.locator.update_line(|l| l + 1);
self.locator.set_column(1);
buffer.push('\n');
}
Some(']') => {
if self.source.content_bytes().starts_with(b"]>") {
fatal_error!(
self,
ParserUnacceptablePatternInCharData,
"']]>' is not allowed in a character data."
);
}
self.locator.update_column(|c| c + 1);
buffer.push(']');
non_whitespace += 1;
}
Some(c) if self.is_char(c) => {
self.locator.update_column(|c| c + 1);
buffer.push(c);
if !self.is_whitespace(c) {
non_whitespace += c.len_utf8();
}
}
Some(c) => {
fatal_error!(
self,
ParserInvalidCharacter,
"The characeter '0x{:X}' is not allowed in the XML document.",
c as u32
);
self.locator.update_column(|c| c + 1);
buffer.push(c);
non_whitespace += c.len_utf8();
}
_ => unreachable!(),
}
if buffer.len() >= CHARDATA_CHUNK_LENGTH {
if !self.fatal_error_occurred {
if let Some(Some((_, validator))) = self.validation_stack.last_mut() {
if non_whitespace != buffer.len() {
validator.push_whitespaces();
}
if non_whitespace == 0 && validator.is_element_content() {
self.handler.ignorable_whitespace(&buffer);
} else {
validator.push_pcdata();
self.handler.characters(&buffer);
}
} else {
self.handler.characters(&buffer);
}
}
buffer.clear();
non_whitespace = 0;
}
// Since it is necessary to check whether ']]>' is included,
// maintain at least 3 bytes as much as possible.
if self.source.content_bytes().len() < 3 {
self.grow()?;
if self.source.content_bytes().is_empty() {
break 'outer;
}
}
}
self.grow()?;
if self.source.content_bytes().starts_with(b"&#") {
// Resolve character references here and include them in the character data.
let c = self.parse_char_ref()?;
buffer.push(c);
non_whitespace += c.len_utf8();
if buffer.len() >= CHARDATA_CHUNK_LENGTH {
if !self.fatal_error_occurred {
if let Some(Some((_, validator))) = self.validation_stack.last_mut() {
if non_whitespace != buffer.len() {
validator.push_whitespaces();
}
if non_whitespace == 0 && validator.is_element_content() {
self.handler.ignorable_whitespace(&buffer);
} else {
validator.push_pcdata();
self.handler.characters(&buffer);
}
} else {
self.handler.characters(&buffer);
}
}
buffer.clear();
non_whitespace = 0;
}
} else {
// Do not process references other than character references or markup here,
// and exit the loop.
break;
}
}
if !buffer.is_empty() && !self.fatal_error_occurred {
if let Some(Some((_, validator))) = self.validation_stack.last_mut() {
if non_whitespace != buffer.len() {
validator.push_whitespaces();
}
if non_whitespace == 0 && validator.is_element_content() {
self.handler.ignorable_whitespace(&buffer);
} else {
validator.push_pcdata();
self.handler.characters(&buffer);
}
} else {
self.handler.characters(&buffer);
}
}
Ok(())
}
}