[librsvg: 5/26] Start defining the types that SelectorImpl requires

[Federico Mena Quintero <federico src gnome org>]

commit eb86c9f8e4132a8c08ec15810cad7e658e9ed900
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Nov 7 12:12:08 2019 -0600

    Start defining the types that SelectorImpl requires

 rsvg_internals/src/css.rs | 64 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 63 insertions(+), 1 deletion(-)
---
diff --git a/rsvg_internals/src/css.rs b/rsvg_internals/src/css.rs
index bba7e9b8..984c9685 100644
--- a/rsvg_internals/src/css.rs
+++ b/rsvg_internals/src/css.rs
@@ -6,14 +6,20 @@ use cssparser::{
     DeclarationParser,
     Parser,
     ParserInput,
+    ToCss,
 };
+use selectors::attr::{AttrSelectorOperation, NamespaceConstraint, CaseSensitivity};
+use selectors::matching::{ElementSelectorFlags, MatchingContext};
+use selectors::{self, OpaqueElement, SelectorImpl};
+
 use std::collections::hash_map::{Entry, Iter as HashMapIter};
 use std::collections::HashMap;
+use std::fmt;
 use std::ptr;
 use std::str;
 
 use libc;
-use markup5ever::{namespace_url, ns, LocalName, QualName};
+use markup5ever::{namespace_url, ns, LocalName, Namespace, Prefix, QualName};
 use url::Url;
 
 use glib::translate::*;
@@ -25,6 +31,7 @@ use crate::error::*;
 use crate::io::{self, BinaryData};
 use crate::node::NodeData;
 use crate::properties::{parse_attribute_value_into_parsed_property, ParsedProperty};
+use crate::text::NodeChars;
 use crate::util::utf8_cstr;
 
 /// A parsed CSS declaration (`name: value [!important]`)
@@ -72,6 +79,61 @@ impl<'i> AtRuleParser<'i> for DeclParser {
     type Error = ValueErrorKind;
 }
 
+/// Dummy type required by the SelectorImpl trait
+#[derive(Clone, Debug, Eq, PartialEq)]
+struct NonTSPseudoClass;
+
+impl ToCss for NonTSPseudoClass {
+    fn to_css<W>(&self, _dest: &mut W) -> fmt::Result where W: fmt::Write {
+        Ok(())
+    }
+}
+
+impl selectors::parser::NonTSPseudoClass for NonTSPseudoClass {
+    type Impl = RsvgSelectors;
+
+    fn is_active_or_hover(&self) -> bool {
+        false
+    }
+
+    fn is_user_action_state(&self) -> bool {
+        false
+    }
+}
+
+/// Dummy type required by the SelectorImpl trait
+#[derive(Clone, Debug, Eq, PartialEq)]
+struct PseudoElement;
+
+impl ToCss for PseudoElement {
+    fn to_css<W>(&self, _dest: &mut W) -> fmt::Result where W: fmt::Write {
+        Ok(())
+    }
+}
+
+impl selectors::parser::PseudoElement for PseudoElement {
+    type Impl = RsvgSelectors;
+}
+
+/// Holds all the types for the SelectorImpl trait
+#[derive(Debug, Clone)]
+struct RsvgSelectors;
+
+impl SelectorImpl for RsvgSelectors {
+    type ExtraMatchingData = ();
+    type AttrValue = String;
+    type Identifier = LocalName;
+    type ClassName = LocalName;
+    type PartName = LocalName;
+    type LocalName = LocalName;
+    type NamespaceUrl = Namespace;
+    type NamespacePrefix = Prefix;
+    type BorrowedNamespaceUrl = Namespace;
+    type BorrowedLocalName = LocalName;
+    type NonTSPseudoClass = NonTSPseudoClass;
+    type PseudoElement = PseudoElement;
+}
+
 #[derive(Clone, Hash, PartialEq, Eq)]
 pub struct Selector {
     name: String,