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use crate::{
ParserSpec,
error::XMLError,
sax::{
error::{fatal_error, validity_error},
handler::SAXHandler,
parser::{ParserState, XMLReader},
source::InputSource,
},
};
impl<'a, Spec: ParserSpec<Reader = InputSource<'a>>, H: SAXHandler> XMLReader<Spec, H> {
/// ```text
/// [30] extSubset ::= TextDecl? extSubsetDecl
/// ```
pub(crate) fn parse_ext_subset(&mut self) -> Result<(), XMLError> {
let old_state = self.state;
self.state = ParserState::InTextDeclaration;
self.grow()?;
if self.source.content_bytes().starts_with(b"<?xml") {
self.parse_text_decl()?;
}
self.source.set_compact_mode();
self.state = ParserState::InExternalSubset;
self.parse_ext_subset_decl()?;
self.state = old_state;
Ok(())
}
/// ```text
/// [31] extSubsetDecl ::= ( markupdecl | conditionalSect | DeclSep)*
/// ```
fn parse_ext_subset_decl(&mut self) -> Result<(), XMLError> {
self.grow()?;
self.skip_whitespaces()?;
loop {
self.grow()?;
match self.source.content_bytes() {
[b'%', ..] => {
let entity_push = self.parse_pe_reference(false)?;
let source_id = self.source.source_id();
self.parse_ext_subset_decl()?;
if self.source.source_id() != source_id {
fatal_error!(
self,
ParserEntityIncorrectNesting,
"A parameter entity in extSubsetDecl is nested incorrectly."
);
return Err(XMLError::ParserEntityIncorrectNesting);
}
if entity_push {
self.pop_source()?;
}
if !self.fatal_error_occurred {
self.handler.end_entity();
}
}
[b'<', b'?', ..] => self.parse_pi()?,
[b'<', b'!', b'-', b'-', ..] => self.parse_comment()?,
[b'<', b'!', b'[', ..] => self.parse_conditional_sect()?,
[b'<', b'!', b'E', b'L', ..] => self.parse_element_decl()?,
[b'<', b'!', b'E', b'N', ..] => self.parse_entity_decl()?,
[b'<', b'!', b'A', ..] => self.parse_attlist_decl()?,
[b'<', b'!', b'N', ..] => self.parse_notation_decl()?,
_ => break Ok(()),
}
self.skip_whitespaces_with_handle_peref(false)?;
}
}
/// ```text
/// [61] conditionalSect ::= includeSect | ignoreSect
/// [62] includeSect ::= '<![' S? 'INCLUDE' S? '[' extSubsetDecl ']]>'
/// [VC: Proper Conditional Section/PE Nesting]
/// [63] ignoreSect ::= '<![' S? 'IGNORE' S? '[' ignoreSectContents* ']]>'
/// [VC: Proper Conditional Section/PE Nesting]
/// [64] ignoreSectContents ::= Ignore ('<![' ignoreSectContents ']]>' Ignore)*
/// [65] Ignore ::= Char* - (Char* ('<![' | ']]>') Char*)
/// ```
fn parse_conditional_sect(&mut self) -> Result<(), XMLError> {
self.grow()?;
if !self.source.content_bytes().starts_with(b"<![") {
fatal_error!(
self,
ParserInvalidConditionalSect,
"A conditional section in DTD does not start with '<!['."
);
return Err(XMLError::ParserInvalidConditionalSect);
}
// skip '<!['
self.source.advance(3)?;
self.locator.update_column(|c| c + 3);
let base_source_id = self.source.source_id();
self.skip_whitespaces_with_handle_peref(true)?;
self.grow()?;
match self.source.content_bytes() {
[b'I', b'N', b'C', b'L', b'U', b'D', b'E', ..] => {
// skip 'INCLUDE'
self.source.advance(7)?;
self.locator.update_column(|c| c + 7);
self.skip_whitespaces_with_handle_peref(true)?;
self.grow()?;
if self.source.source_id() != base_source_id {
// [VC: Proper Conditional Section/PE Nesting]
validity_error!(
self,
ParserEntityIncorrectNesting,
"A parameter entity in the conditional section is nested incorrectly."
);
}
if !self.source.content_bytes().starts_with(b"[") {
fatal_error!(
self,
ParserInvalidConditionalSect,
"'[' is not found after 'INCLUDE' in a conditional section."
);
return Err(XMLError::ParserInvalidConditionalSect);
}
// skip '['
self.source.advance(1)?;
self.locator.update_column(|c| c + 1);
self.parse_ext_subset_decl()?;
if !self.source.content_bytes().starts_with(b"]]>") {
fatal_error!(
self,
ParserInvalidConditionalSect,
"The conditional section does not end with ']]>'."
);
return Err(XMLError::ParserInvalidConditionalSect);
}
// skip ']]>'
self.source.advance(3)?;
self.locator.update_column(|c| c + 3);
}
[b'I', b'G', b'N', b'O', b'R', b'E', ..] => {
// skip 'IGNORE'
self.source.advance(6)?;
self.locator.update_column(|c| c + 6);
self.skip_whitespaces_with_handle_peref(true)?;
self.grow()?;
if self.source.source_id() != base_source_id {
// [VC: Proper Conditional Section/PE Nesting]
validity_error!(
self,
ParserEntityIncorrectNesting,
"A parameter entity in the conditional section is nested incorrectly."
);
}
if !self.source.content_bytes().starts_with(b"[") {
fatal_error!(
self,
ParserInvalidConditionalSect,
"'[' is not found after 'IGNORE' in a conditional section."
);
return Err(XMLError::ParserInvalidConditionalSect);
}
// skip '['
self.source.advance(1)?;
self.locator.update_column(|c| c + 1);
let mut depth = 1;
while depth > 0 {
self.grow()?;
if self.source.content_bytes().starts_with(b"<![") {
depth += 1;
self.source.advance(3)?;
self.locator.update_column(|c| c + 3);
} else if self.source.content_bytes().starts_with(b"]]>") {
depth -= 1;
self.source.advance(3)?;
self.locator.update_column(|c| c + 3);
} else {
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);
}
}
Some('\n') => {
self.locator.update_line(|l| l + 1);
self.locator.set_column(1);
}
Some(c) if self.is_char(c) => {
self.locator.update_column(|c| c + 1);
}
Some(c) => {
fatal_error!(
self,
ParserInvalidCharacter,
"The character '0x{:X}' is not allowed in the XML document.",
c as u32
);
self.locator.update_column(|c| c + 1);
}
None => return Err(XMLError::ParserUnexpectedEOF),
}
}
}
}
_ => {
fatal_error!(
self,
ParserInvalidConditionalSect,
"A conditional section does not have neither 'INCLUDE' nor 'IGNORE' parameter."
);
return Err(XMLError::ParserInvalidConditionalSect);
}
}
Ok(())
}
}