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script: Use xpath ns resolver to resolve namespace prefixes (#39321)

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The xpath resolver is a function provided by the user to resolve
namespace prefixes. Previously, we were ignoring the argument.

Testing: New web platform tests start to pass
Part of https://github.com/servo/servo/issues/34527

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-09-16 19:25:45 +02:00 • committed by GitHub
parent f3d5617349
commit 1898a740a8
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GPG key ID: B5690EEEBB952194
9 changed files with 164 additions and 132 deletions
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23
components/script/dom/element.rs
View file

@ -1812,16 +1812,16 @@ impl Element {
Ref::map(self.attrs.borrow(), |attrs| &**attrs)
}
// Element branch of https://dom.spec.whatwg.org/#locate-a-namespace
/// Element branch of <https://dom.spec.whatwg.org/#locate-a-namespace>
pub(crate) fn locate_namespace(&self, prefix: Option<DOMString>) -> Namespace {
let namespace_prefix = prefix.clone().map(|s| Prefix::from(&*s));
// "1. If prefix is "xml", then return the XML namespace."
// Step 1. If prefix is "xml", then return the XML namespace.
if namespace_prefix == Some(namespace_prefix!("xml")) {
return ns!(xml);
}
// "2. If prefix is "xmlns", then return the XMLNS namespace."
// Step 2. If prefix is "xmlns", then return the XMLNS namespace.
if namespace_prefix == Some(namespace_prefix!("xmlns")) {
return ns!(xmlns);
}
@ -1833,21 +1833,20 @@ impl Element {
.inclusive_ancestors(ShadowIncluding::No)
.filter_map(DomRoot::downcast::<Self>);
// "5. If its parent element is null, then return null."
// "6. Return the result of running locate a namespace on its parent element using prefix."
// Step 5. If its parent element is null, then return null.
// Step 6. Return the result of running locate a namespace on its parent element using prefix.
for element in inclusive_ancestor_elements {
// "3. If its namespace is non-null and its namespace prefix is prefix, then return
// namespace."
// Step 3. If its namespace is non-null and its namespace prefix is prefix, then return namespace.
if element.namespace() != &ns!() &&
element.prefix().as_ref().map(|p| &**p) == prefix.as_deref()
{
return element.namespace().clone();
}
// "4. If it has an attribute whose namespace is the XMLNS namespace, namespace prefix
// Step 4. If it has an attribute whose namespace is the XMLNS namespace, namespace prefix
// is "xmlns", and local name is prefix, or if prefix is null and it has an attribute
// whose namespace is the XMLNS namespace, namespace prefix is null, and local name is
// "xmlns", then return its value if it is not the empty string, and null otherwise."
// "xmlns", then return its value if it is not the empty string, and null otherwise.
let attr = Ref::filter_map(self.attrs(), |attrs| {
attrs.iter().find(|attr| {
if attr.namespace() != &ns!(xmlns) {
@ -3090,18 +3089,18 @@ impl Element {
#[allow(non_snake_case)]
impl ElementMethods<crate::DomTypeHolder> for Element {
// https://dom.spec.whatwg.org/#dom-element-namespaceuri
/// <https://dom.spec.whatwg.org/#dom-element-namespaceuri>
fn GetNamespaceURI(&self) -> Option<DOMString> {
Node::namespace_to_string(self.namespace.clone())
}
// https://dom.spec.whatwg.org/#dom-element-localname
/// <https://dom.spec.whatwg.org/#dom-element-localname>
fn LocalName(&self) -> DOMString {
// FIXME(ajeffrey): Convert directly from LocalName to DOMString
DOMString::from(&*self.local_name)
}
// https://dom.spec.whatwg.org/#dom-element-prefix
/// <https://dom.spec.whatwg.org/#dom-element-prefix>
fn GetPrefix(&self) -> Option<DOMString> {
self.prefix.borrow().as_ref().map(|p| DOMString::from(&**p))
}

9
components/script/dom/node.rs
View file

@ -3988,13 +3988,10 @@ impl NodeMethods<crate::DomTypeHolder> for Node {
/// <https://dom.spec.whatwg.org/#dom-node-lookupnamespaceuri>
fn LookupNamespaceURI(&self, prefix: Option<DOMString>) -> Option<DOMString> {
// Step 1.
let prefix = match prefix {
Some(ref p) if p.is_empty() => None,
pre => pre,
};
// Step 1. If prefix is the empty string, then set it to null.
let prefix = prefix.filter(|prefix| !prefix.is_empty());
// Step 2.
// Step 2. Return the result of running locate a namespace for this using prefix.
Node::namespace_to_string(Node::locate_namespace(self, prefix))
}

11
components/script/dom/xpathevaluator.rs
View file

@ -9,7 +9,6 @@ use js::rust::HandleObject;
use super::bindings::error::Error;
use crate::dom::bindings::codegen::Bindings::XPathEvaluatorBinding::XPathEvaluatorMethods;
use crate::dom::bindings::codegen::Bindings::XPathExpressionBinding::XPathExpression_Binding::XPathExpressionMethods;
use crate::dom::bindings::codegen::Bindings::XPathNSResolverBinding::XPathNSResolver;
use crate::dom::bindings::error::Fallible;
use crate::dom::bindings::reflector::{DomGlobal, Reflector, reflect_dom_object_with_proto};
@ -91,7 +90,7 @@ impl XPathEvaluatorMethods<crate::DomTypeHolder> for XPathEvaluator {
&self,
expression_str: DOMString,
context_node: &Node,
_resolver: Option<Rc<XPathNSResolver>>,
resolver: Option<Rc<XPathNSResolver>>,
result_type: u16,
result: Option<&XPathResult>,
can_gc: CanGc,
@ -101,12 +100,6 @@ impl XPathEvaluatorMethods<crate::DomTypeHolder> for XPathEvaluator {
let parsed_expression =
crate::xpath::parse(&expression_str).map_err(|_| Error::Syntax(None))?;
let expression = XPathExpression::new(window, None, can_gc, parsed_expression);
XPathExpressionMethods::<crate::DomTypeHolder>::Evaluate(
&*expression,
context_node,
result_type,
result,
can_gc,
)
expression.evaluate_internal(context_node, result_type, result, resolver, can_gc)
}
}

25
components/script/dom/xpathexpression.rs
View file

@ -2,10 +2,13 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::rc::Rc;
use dom_struct::dom_struct;
use js::rust::HandleObject;
use crate::dom::bindings::codegen::Bindings::XPathExpressionBinding::XPathExpressionMethods;
use crate::dom::bindings::codegen::Bindings::XPathNSResolverBinding::XPathNSResolver;
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::reflector::{DomGlobal, Reflector, reflect_dom_object_with_proto};
use crate::dom::bindings::root::{Dom, DomRoot};
@ -45,15 +48,13 @@ impl XPathExpression {
can_gc,
)
}
}
impl XPathExpressionMethods<crate::DomTypeHolder> for XPathExpression {
/// <https://dom.spec.whatwg.org/#dom-xpathexpression-evaluate>
fn Evaluate(
pub(crate) fn evaluate_internal(
&self,
context_node: &Node,
result_type_num: u16,
_result: Option<&XPathResult>,
resolver: Option<Rc<XPathNSResolver>>,
can_gc: CanGc,
) -> Fallible<DomRoot<XPathResult>> {
let result_type = XPathResultType::try_from(result_type_num)
@ -62,8 +63,7 @@ impl XPathExpressionMethods<crate::DomTypeHolder> for XPathExpression {
let global = self.global();
let window = global.as_window();
let result_value = evaluate_parsed_xpath(&self.parsed_expression, context_node)
.map_err(|_e| Error::Operation)?;
let result_value = evaluate_parsed_xpath(&self.parsed_expression, context_node, resolver)?;
// TODO(vlindhol): support putting results into mutable `_result` as per the spec
Ok(XPathResult::new(
@ -75,3 +75,16 @@ impl XPathExpressionMethods<crate::DomTypeHolder> for XPathExpression {
))
}
}
impl XPathExpressionMethods<crate::DomTypeHolder> for XPathExpression {
/// <https://dom.spec.whatwg.org/#dom-xpathexpression-evaluate>
fn Evaluate(
&self,
context_node: &Node,
result_type_num: u16,
result: Option<&XPathResult>,
can_gc: CanGc,
) -> Fallible<DomRoot<XPathResult>> {
self.evaluate_internal(context_node, result_type_num, result, None, can_gc)
}
}

58
components/script/xpath/context.rs
View file

@ -2,26 +2,33 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::fmt;
use std::iter::Enumerate;
use std::rc::Rc;
use std::vec::IntoIter;
use script_bindings::error::Fallible;
use script_bindings::script_runtime::CanGc;
use script_bindings::str::DOMString;
use super::Node;
use crate::dom::bindings::callback::ExceptionHandling;
use crate::dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use crate::dom::bindings::codegen::Bindings::XPathNSResolverBinding::XPathNSResolver;
use crate::dom::bindings::root::DomRoot;
/// The context during evaluation of an XPath expression.
#[derive(Debug)]
pub(crate) struct EvaluationCtx {
/// Where we started at
/// Where we started at.
pub(crate) starting_node: DomRoot<Node>,
/// The "current" node in the evaluation
/// The "current" node in the evaluation.
pub(crate) context_node: DomRoot<Node>,
/// Details needed for evaluating a predicate list
/// Details needed for evaluating a predicate list.
pub(crate) predicate_ctx: Option<PredicateCtx>,
/// The nodes we're currently matching against
/// The nodes we're currently matching against.
pub(crate) predicate_nodes: Option<Vec<DomRoot<Node>>>,
/// A list of known namespace prefixes.
pub(crate) resolver: Option<Rc<XPathNSResolver>>,
}
#[derive(Clone, Copy, Debug)]
@ -32,12 +39,13 @@ pub(crate) struct PredicateCtx {
impl EvaluationCtx {
/// Prepares the context used while evaluating the XPath expression
pub(crate) fn new(context_node: &Node) -> EvaluationCtx {
pub(crate) fn new(context_node: &Node, resolver: Option<Rc<XPathNSResolver>>) -> EvaluationCtx {
EvaluationCtx {
starting_node: DomRoot::from_ref(context_node),
context_node: DomRoot::from_ref(context_node),
predicate_ctx: None,
predicate_nodes: None,
resolver,
}
}
@ -48,6 +56,7 @@ impl EvaluationCtx {
context_node: DomRoot::from_ref(node),
predicate_ctx: self.predicate_ctx,
predicate_nodes: self.predicate_nodes.clone(),
resolver: self.resolver.clone(),
}
}
@ -57,6 +66,7 @@ impl EvaluationCtx {
context_node: self.context_node.clone(),
predicate_ctx: None,
predicate_nodes: Some(nodes.into_iter().map(DomRoot::from_ref).collect()),
resolver: self.resolver.clone(),
}
}
@ -74,9 +84,26 @@ impl EvaluationCtx {
}
/// Resolve a namespace prefix using the context node's document
pub(crate) fn resolve_namespace(&self, prefix: Option<&str>) -> Option<DOMString> {
self.context_node
.LookupNamespaceURI(prefix.map(DOMString::from))
pub(crate) fn resolve_namespace(
&self,
prefix: Option<&str>,
can_gc: CanGc,
) -> Fallible<Option<DOMString>> {
// First check if the prefix is known by our resolver function
if let Some(resolver) = self.resolver.as_ref() {
if let Some(namespace_uri) = resolver.LookupNamespaceURI__(
prefix.map(DOMString::from),
ExceptionHandling::Rethrow,
can_gc,
)? {
return Ok(Some(namespace_uri));
}
}
// Then, see if it's defined on the context node
Ok(self
.context_node
.LookupNamespaceURI(prefix.map(DOMString::from)))
}
}
@ -100,6 +127,19 @@ impl Iterator for EvalNodesetIter<'_> {
index: idx + 1,
size: self.size,
}),
resolver: self.ctx.resolver.clone(),
})
}
}
impl fmt::Debug for EvaluationCtx {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("EvaluationCtx")
.field("starting_node", &self.starting_node)
.field("context_node", &self.context_node)
.field("predicate_ctx", &self.predicate_ctx)
.field("predicate_nodes", &self.predicate_nodes)
.field("resolver", &"<callback function>")
.finish()
}
}

72
components/script/xpath/eval.rs
View file

@ -5,6 +5,7 @@
use std::fmt;
use html5ever::{LocalName, Namespace, Prefix, QualName, local_name, namespace_prefix, ns};
use script_bindings::script_runtime::CanGc;
use super::parser::{
AdditiveOp, Axis, EqualityOp, Expr, FilterExpr, KindTest, Literal, MultiplicativeOp, NodeTest,
@ -15,6 +16,7 @@ use super::{EvaluationCtx, Value};
use crate::dom::attr::Attr;
use crate::dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use crate::dom::bindings::domname::namespace_from_domstring;
use crate::dom::bindings::error::Error as JsError;
use crate::dom::bindings::inheritance::{Castable, CharacterDataTypeId, NodeTypeId};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
@ -24,16 +26,30 @@ use crate::dom::node::{Node, ShadowIncluding};
use crate::dom::processinginstruction::ProcessingInstruction;
use crate::xpath::context::PredicateCtx;
#[derive(Clone, Debug, PartialEq)]
#[derive(Clone, Debug)]
pub(crate) enum Error {
NotANodeset,
InvalidPath,
UnknownFunction { name: QualName },
UnknownVariable { name: QualName },
UnknownNamespace { prefix: String },
InvalidQName { qname: ParserQualName },
FunctionEvaluation { fname: String },
Internal { msg: String },
UnknownFunction {
name: QualName,
},
UnknownVariable {
name: QualName,
},
UnknownNamespace {
prefix: String,
},
InvalidQName {
qname: ParserQualName,
},
FunctionEvaluation {
fname: String,
},
Internal {
msg: String,
},
/// A JS exception that needs to be propagated to the caller.
JsException(JsError),
}
impl std::fmt::Display for Error {
@ -55,6 +71,9 @@ impl std::fmt::Display for Error {
Error::Internal { msg } => {
write!(f, "internal error: {}", msg)
},
Error::JsException(exception) => {
write!(f, "JS exception: {:?}", exception)
},
}
}
}
@ -360,29 +379,24 @@ fn validate_and_extract(
}
}
pub(crate) struct QualNameConverter<'a> {
qname: &'a ParserQualName,
context: &'a EvaluationCtx,
}
impl<'a> TryFrom<QualNameConverter<'a>> for QualName {
type Error = Error;
fn try_from(converter: QualNameConverter<'a>) -> Result<Self, Self::Error> {
let qname_as_str = converter.qname.to_string();
let namespace = converter
.context
.resolve_namespace(converter.qname.prefix.as_deref());
pub(crate) fn convert_parsed_qname_to_qualified_name(
qname: &ParserQualName,
context: &EvaluationCtx,
can_gc: CanGc,
) -> Result<QualName, Error> {
let qname_as_str = qname.to_string();
let namespace = context
.resolve_namespace(qname.prefix.as_deref(), can_gc)
.map_err(Error::JsException)?;
if let Ok((ns, prefix, local)) = validate_and_extract(namespace, &qname_as_str) {
Ok(QualName { prefix, ns, local })
} else {
Err(Error::InvalidQName {
qname: converter.qname.clone(),
qname: qname.clone(),
})
}
}
}
#[derive(Debug)]
pub(crate) enum NameTestComparisonMode {
@ -434,11 +448,16 @@ pub(crate) fn element_name_test(
}
}
fn apply_node_test(context: &EvaluationCtx, test: &NodeTest, node: &Node) -> Result<bool, Error> {
fn apply_node_test(
context: &EvaluationCtx,
test: &NodeTest,
node: &Node,
can_gc: CanGc,
) -> Result<bool, Error> {
let result = match test {
NodeTest::Name(qname) => {
// Convert the unvalidated "parser QualName" into the proper QualName structure
let wanted_name: QualName = QualNameConverter { qname, context }.try_into()?;
let wanted_name = convert_parsed_qname_to_qualified_name(qname, context, can_gc)?;
match node.type_id() {
NodeTypeId::Element(_) => {
let element = node.downcast::<Element>().unwrap();
@ -563,7 +582,9 @@ impl Evaluatable for StepExpr {
let filtered_nodes: Vec<DomRoot<Node>> = nodes
.into_iter()
.map(|node| {
apply_node_test(context, &axis_step.node_test, &node)
// FIXME: propagate this can_gc up further. This likely requires removing the "Evaluate"
// trait or changing the signature of "evaluate". The trait is not really necessary anyways.
apply_node_test(context, &axis_step.node_test, &node, CanGc::note())
.map(|matches| matches.then_some(node))
})
.collect::<Result<Vec<_>, _>>()?
@ -613,6 +634,7 @@ impl Evaluatable for PredicateListExpr {
context_node: node.clone(),
predicate_nodes: context.predicate_nodes.clone(),
predicate_ctx: Some(PredicateCtx { index: i + 1, size }),
resolver: context.resolver.clone(),
};
let eval_result = predicate_expr.expr.evaluate(&predicate_ctx);

70
components/script/xpath/mod.rs
View file

@ -2,13 +2,16 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::rc::Rc;
use context::EvaluationCtx;
use eval::Evaluatable;
use eval::{Error as EvaluationError, Evaluatable};
pub(crate) use eval_value::{NodesetHelpers, Value};
use parser::OwnedParserError;
pub(crate) use parser::{Expr, parse as parse_impl};
use super::dom::node::Node;
use crate::dom::bindings::codegen::Bindings::XPathNSResolverBinding::XPathNSResolver;
use crate::dom::bindings::error::{Error as JsError, Error, Fallible};
mod context;
#[allow(dead_code)]
@ -19,58 +22,41 @@ mod eval_value;
#[allow(dead_code)]
mod parser;
/// The failure modes of executing an XPath.
#[derive(Debug, PartialEq)]
pub(crate) enum Error {
/// The XPath was syntactically invalid
Parsing { source: OwnedParserError },
/// The XPath could not be executed
Evaluating { source: eval::Error },
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
Error::Parsing { source } => write!(f, "Unable to parse XPath: {}", source),
Error::Evaluating { source } => write!(f, "Unable to evaluate XPath: {}", source),
}
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Error::Parsing { source } => Some(source),
Error::Evaluating { source } => Some(source),
}
}
}
/// Parse an XPath expression from a string
pub(crate) fn parse(xpath: &str) -> Result<Expr, Error> {
pub(crate) fn parse(xpath: &str) -> Fallible<Expr> {
match parse_impl(xpath) {
Ok(expr) => {
debug!("Parsed XPath: {:?}", expr);
debug!("Parsed XPath: {expr:?}");
Ok(expr)
},
Err(e) => {
debug!("Unable to parse XPath: {}", e);
Err(Error::Parsing { source: e })
Err(error) => {
debug!("Unable to parse XPath: {error}");
Err(Error::Operation)
},
}
}
/// Evaluate an already-parsed XPath expression
pub(crate) fn evaluate_parsed_xpath(expr: &Expr, context_node: &Node) -> Result<Value, Error> {
let context = EvaluationCtx::new(context_node);
pub(crate) fn evaluate_parsed_xpath(
expr: &Expr,
context_node: &Node,
resolver: Option<Rc<XPathNSResolver>>,
) -> Fallible<Value> {
let context = EvaluationCtx::new(context_node, resolver);
match expr.evaluate(&context) {
Ok(v) => {
debug!("Evaluated XPath: {:?}", v);
Ok(v)
Ok(value) => {
debug!("Evaluated XPath: {value:?}");
Ok(value)
},
Err(e) => {
debug!("Unable to evaluate XPath: {}", e);
Err(Error::Evaluating { source: e })
Err(error) => {
debug!("Unable to evaluate XPath: {error}");
let error = match error {
EvaluationError::JsException(exception) => exception,
_ => JsError::Operation,
};
Err(error)
},
}
}

6
tests/wpt/meta/domxpath/text-html-attributes.html.ini vendored
View file

@ -11,9 +11,6 @@
[Select HTML element with non-ascii attribute 3]
expected: FAIL
[Select SVG element based on mixed case attribute]
expected: FAIL
[Select both HTML and SVG elements based on mixed case attribute]
expected: FAIL
@ -22,6 +19,3 @@
[Select SVG element with non-ascii attribute 2]
expected: FAIL
[svg element with XLink attribute]
expected: FAIL

12
tests/wpt/meta/domxpath/text-html-elements.html.ini vendored
View file

@ -1,19 +1,7 @@
[text-html-elements.html]
[HTML elements namespace prefix]
expected: FAIL
[HTML elements mixed use of prefix]
expected: FAIL
[SVG elements namespace prefix]
expected: FAIL
[HTML elements mixed case]
expected: FAIL
[SVG elements mixed case selector]
expected: FAIL
[Non-ascii HTML element]
expected: FAIL