Add XPath parser/evaluator (#34463)

* Add XPath parser/evaluator

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* Correctly annotate XPathEvaluator IDL

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: have bindings pass in `can_gc`

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: add docstrings

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: implement PartialEq for Value for readability

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: add docstrings for CoreFunctions

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: simplify node test code

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: add unit tests for string handling xpath functions

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* put xpath features behind dom.xpath.enabled pref

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review] remove rstest and insta dev-deps

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* update wpt test expectations

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* [PR review]: tweak metadata files

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

* update wpt test expectations AGAIN

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

---------

Signed-off-by: Ville Lindholm <ville@lindholm.dev>

tests/wpt/meta/domxpath/document.tentative.html.ini

@@ -0,0 +1,3 @@
+[document.tentative.html]
+  [XPath parent of documentElement]
+    expected: FAIL

tests/wpt/meta/domxpath/fn-lang.html.ini

@@ -0,0 +1,21 @@
+[fn-lang.html]
+  [lang("en"): <root><match lang="en"></match></root>]
+    expected: FAIL
+
+  [lang("en"): <root><match lang="EN"></match></root>]
+    expected: FAIL
+
+  [lang("en"): <root><match lang="en-us"></match></root>]
+    expected: FAIL
+
+  [lang("en"): <root><unmatch></unmatch></root>]
+    expected: FAIL
+
+  [lang("ja"): <root lang="ja"><match></match></root>]
+    expected: FAIL
+
+  [lang("ja"): <root lang="ja-jp"><unmatch lang="ja_JP"></unmatch></root>]
+    expected: FAIL
+
+  [lang("ko"): <root><unmatch lang="Ko"></unmatch></root>]
+    expected: FAIL

tests/wpt/meta/domxpath/lexical-structure.html.ini

@@ -0,0 +1,6 @@
+[lexical-structure.html]
+  [Literal: Only ' and " should be handled as literal quotes.]
+    expected: FAIL
+
+  [ExprWhitespace: Only #x20 #x9 #xD or #xA must be handled as a whitespace.]
+    expected: FAIL

tests/wpt/meta/domxpath/node-sets.html.ini

@@ -0,0 +1,3 @@
+[node-sets.html]
+  [| operator should evaluate both sides of expressions with the same context node]
+    expected: FAIL

tests/wpt/meta/domxpath/predicates.html.ini

@@ -0,0 +1,3 @@
+[predicates.html]
+  [An expression in a predicate should not change the context node]
+    expected: FAIL

tests/wpt/meta/domxpath/resolver-callback-interface-cross-realm.tentative.html.ini

@@ -0,0 +1,15 @@
+[resolver-callback-interface-cross-realm.tentative.html]
+  [XPathNSResolver is cross-realm plain object without 'lookupNamespaceURI' property]
+    expected: FAIL
+
+  [XPathNSResolver is cross-realm plain object with non-callable 'lookupNamespaceURI' property]
+    expected: FAIL
+
+  [XPathNSResolver is cross-realm non-callable revoked Proxy]
+    expected: FAIL
+
+  [XPathNSResolver is cross-realm callable revoked Proxy]
+    expected: FAIL
+
+  [XPathNSResolver is cross-realm plain object with revoked Proxy as 'lookupNamespaceURI' property]
+    expected: FAIL

tests/wpt/meta/domxpath/resolver-callback-interface.html.ini

@@ -0,0 +1,30 @@
+[resolver-callback-interface.html]
+  [callable resolver]
+    expected: FAIL
+
+  [callable resolver: result is not cached]
+    expected: FAIL
+
+  [callable resolver: abrupt completion from Call]
+    expected: FAIL
+
+  [callable resolver: no 'lookupNamespaceURI' lookups]
+    expected: FAIL
+
+  [object resolver]
+    expected: FAIL
+
+  [object resolver: this value and `prefix` argument]
+    expected: FAIL
+
+  [object resolver: 'lookupNamespaceURI' is not cached]
+    expected: FAIL
+
+  [object resolver: abrupt completion from Get]
+    expected: FAIL
+
+  [object resolver: 'lookupNamespaceURI' is thruthy and not callable]
+    expected: FAIL
+
+  [object resolver: 'lookupNamespaceURI' is falsy and not callable]
+    expected: FAIL

tests/wpt/meta/domxpath/resolver-non-string-result.html.ini

@@ -0,0 +1,18 @@
+[resolver-non-string-result.html]
+  [undefined]
+    expected: FAIL
+
+  [null]
+    expected: FAIL
+
+  [number]
+    expected: FAIL
+
+  [boolean]
+    expected: FAIL
+
+  [symbol]
+    expected: FAIL
+
+  [object coercion (abrupt completion)]
+    expected: FAIL

tests/wpt/meta/domxpath/text-html-attributes.html.ini

@@ -0,0 +1,39 @@
+[text-html-attributes.html]
+  [Select html element based on attribute]
+    expected: FAIL
+
+  [Select html element based on attribute mixed case]
+    expected: FAIL
+
+  [Select both HTML and SVG elements based on attribute]
+    expected: FAIL
+
+  [Select HTML element with non-ascii attribute 1]
+    expected: FAIL
+
+  [Select HTML element with non-ascii attribute 2]
+    expected: FAIL
+
+  [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
+
+  [Select SVG elements with refX attribute]
+    expected: FAIL
+
+  [Select SVG element with non-ascii attribute 1]
+    expected: FAIL
+
+  [Select SVG element with non-ascii attribute 2]
+    expected: FAIL
+
+  [xmlns attribute]
+    expected: FAIL
+
+  [svg element with XLink attribute]
+    expected: FAIL

tests/wpt/meta/domxpath/text-html-elements.html.ini

@@ -0,0 +1,24 @@
+[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
+
+  [Non-ascii HTML element3]
+    expected: FAIL
+
+  [Throw with invalid prefix]
+    expected: FAIL