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use std::sync::Arc;
use crate::{
ParserSpec,
error::XMLError,
sax::{
EntityDecl,
error::{error, fatal_error, validity_error},
handler::SAXHandler,
parser::{ParserOption, ParserState, XMLReader},
source::InputSource,
},
uri::URIString,
};
impl<'a, Spec: ParserSpec<Reader = InputSource<'a>>, H: SAXHandler> XMLReader<Spec, H> {
/// ```text
/// [43] content ::= CharData? ((element | Reference | CDSect | PI | Comment) CharData?)*
/// ```
pub(crate) fn parse_content(&mut self) -> Result<(), XMLError> {
loop {
self.grow()?;
if self.source.content_bytes().is_empty() {
break Ok(());
}
match self.source.content_bytes() {
[b'<', b'?', ..] => self.parse_pi()?,
[b'<', b'!', b'-', b'-', ..] => self.parse_comment()?,
[b'<', b'!', b'[', b'C', b'D', b'A', b'T', b'A', b'[', ..] => {
self.parse_cdsect()?
}
[b'<', b'/', ..] => break Ok(()),
[b'<', ..] => self.parse_element()?,
[b'&', b'#', ..] => {
// Character references are treated as part of the character data.
self.parse_char_data()?
}
[b'&', ..] => self.parse_entity_ref_in_content()?,
_ => self.parse_char_data()?,
}
if let Some(Some((_, validator))) = self.validation_stack.last_mut() {
// If we reach this point, we should have read at least one markup or character data.
// Since Misc does not affect the validation of elements other than those of type EMPTY,
// it is safe to assume that Misc appears here.
validator.push_misc();
}
}
}
/// # Note
/// This method parses and expands assuming that entity references appear in the content. \
/// Entity references appearing in attribute values are outside the scope of this method.
///
/// ```text
/// [68] EntityRef ::= '&' Name ';' [WFC: Entity Declared]
/// [VC: Entity Declared]
/// [WFC: Parsed Entity]
/// [WFC: No Recursion]
/// ```
fn parse_entity_ref_in_content(&mut self) -> Result<(), XMLError> {
self.grow()?;
if !self.source.content_bytes().starts_with(b"&") {
fatal_error!(
self,
ParserInvalidEntityReference,
"The entity reference does not start with '&'."
);
return Err(XMLError::ParserInvalidEntityReference);
}
// skip '&'
self.source.advance(1)?;
self.locator.update_column(|c| c + 1);
let mut name = String::new();
if self.config.is_enable(ParserOption::Namespaces) {
self.parse_ncname(&mut name)?;
} else {
self.parse_name(&mut name)?;
}
self.grow()?;
if !self.source.content_bytes().starts_with(b";") {
fatal_error!(
self,
ParserInvalidEntityReference,
"The entity reference does not end with ';'."
);
return Err(XMLError::ParserInvalidEntityReference);
}
// skip ';'
self.source.advance(1)?;
self.locator.update_column(|c| c + 1);
if let Some(decl) = self.entities.get(name.as_str()) {
if self.entity_recursion_check(name.as_str()) {
// [WFC: No Recursion]
fatal_error!(
self,
ParserEntityRecursion,
"The entity '{}' appears recursively.",
name
);
return Err(XMLError::ParserEntityRecursion);
}
match decl {
EntityDecl::InternalGeneralEntity {
base_uri,
replacement_text,
in_external_markup,
} => {
if *in_external_markup && self.standalone == Some(true) {
// [WFC: Entity Declared]
fatal_error!(
self,
ParserUndeclaredEntityReference,
"standalone='yes', but it does not reference any entities declared in the internal DTD."
);
} else {
let source = InputSource::from_content(replacement_text.as_ref());
let name: Arc<str> = name.into();
self.push_source(
Box::new(source),
base_uri.clone(),
Some(name.clone()),
URIString::parse(format!("?internal-entity.{name}"))?.into(),
None,
)?;
if !self.fatal_error_occurred {
self.handler.start_entity(&name);
}
self.parse_content()?;
self.grow()?;
if !self.source.is_empty() {
fatal_error!(
self,
ParserEntityIncorrectNesting,
"The entity '{}' is nested incorrectly.",
name
);
}
self.pop_source()?;
if !self.fatal_error_occurred {
self.handler.end_entity();
}
}
}
EntityDecl::ExternalGeneralParsedEntity {
base_uri,
system_id,
public_id,
in_external_markup,
} => {
if *in_external_markup && self.standalone == Some(true) {
// [WFC: Entity Declared]
fatal_error!(
self,
ParserUndeclaredEntityReference,
"standalone='yes', but it does not reference any entities declared in the internal DTD."
);
} else if self.config.is_enable(ParserOption::ExternalGeneralEntities)
|| self.config.is_enable(ParserOption::Validation)
{
match self.handler.resolve_entity(
&name,
public_id.as_deref(),
base_uri.as_ref(),
system_id.as_ref(),
) {
Ok(source) => {
let source = source;
let name: Arc<str> = name.into();
self.push_source(
Box::new(source),
base_uri.clone(),
Some(name.clone()),
system_id.as_ref().into(),
public_id.as_deref().map(Arc::from),
)?;
if !self.fatal_error_occurred {
self.handler.start_entity(&name);
}
self.parse_ext_parsed_ent()?;
self.grow()?;
if !self.source.is_empty() {
fatal_error!(
self,
ParserEntityIncorrectNesting,
"The entity '{}' is nested incorrectly.",
name
);
}
self.pop_source()?;
if !self.fatal_error_occurred {
self.handler.end_entity();
}
}
Err(err) => {
error!(
self,
err,
"The external general entity '{}' cannot be resolved.",
name
);
}
}
} else if !self.fatal_error_occurred {
self.handler.skipped_entity(&name);
}
}
EntityDecl::ExternalGeneralUnparsedEntity { .. } => {
// [WFC: Parsed Entity]
fatal_error!(
self,
ParserInvalidEntityReference,
"The unparsed entity '{}' cannot be referred.",
name
);
}
EntityDecl::InternalParameterEntity { .. }
| EntityDecl::ExternalParameterEntity { .. } => {
// The fact that we have reached this point suggests that the general
// entity has been mistakenly registered as a parameter entity somewhere.
unreachable!("Internal error: Reference name: {name}");
}
}
} else {
if self.standalone == Some(true)
|| (!self.has_internal_subset && !self.has_external_subset)
|| (!self.has_external_subset && !self.has_parameter_entity)
{
// [WFC: Entity Declared]
fatal_error!(
self,
ParserEntityNotFound,
"The entity '{}' is not declared.",
name
);
} else if self.config.is_enable(ParserOption::Validation) {
// [VC: Entity Declared]
validity_error!(
self,
ParserEntityNotFound,
"The entity '{}' is not declared.",
name
);
}
if !self.fatal_error_occurred {
self.handler.skipped_entity(&name);
}
}
Ok(())
}
/// # Note
/// It is assumed that the `InputSource` corresponding to the External Parsed Entity
/// to be parsed has been set by `push_source`. \
/// In addition, `start_entity` and `end_entity` are not reported. This is the duty
/// of the caller.
///
/// ```text
/// [78] extParsedEnt ::= TextDecl? content
/// ```
fn parse_ext_parsed_ent(&mut self) -> Result<(), XMLError> {
self.state = ParserState::InTextDeclaration;
self.grow()?;
// Save version and encoding because they may be overwritten by a text declaration.
let version = self.version;
let encoding = self.encoding.clone();
if self.source.content_bytes().starts_with(b"<?xml") {
self.parse_text_decl()?;
}
self.state = ParserState::InContent;
self.source.set_compact_mode();
self.parse_content()?;
self.grow()?;
if !self.source.is_empty() {
fatal_error!(
self,
ParserUnexpectedDocumentContent,
"Unnecessary external parsed content remains. (Elements, character data, etc.)"
);
return Err(XMLError::ParserUnexpectedDocumentContent);
}
// Restore version and encoding.
self.encoding = encoding;
self.version = version;
Ok(())
}
}