[gtksourceview] css.lang: Add highlighting for :lang() and :not() arguments

[Sébastien Wilmet <swilmet src gnome org>]

commit 020ca81a465d49cb116c7a688ccb5b0f51e52564
Author: Jeffery To <jeffery to gmail com>
Date:   Fri May 11 08:00:23 2018 +0800

    css.lang: Add highlighting for :lang() and :not() arguments
    
    This adds contexts to highlight the parentheses and arguments of :lang()
    and :not().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=796130

 data/language-specs/css.lang       |   44 ++++++++++++++++++++++++++++++++++++
 tests/syntax-highlighting/file.css |   12 +++++++++
 2 files changed, 56 insertions(+), 0 deletions(-)
---
diff --git a/data/language-specs/css.lang b/data/language-specs/css.lang
index b92d596..ee2f345 100644
--- a/data/language-specs/css.lang
+++ b/data/language-specs/css.lang
@@ -1677,6 +1677,47 @@
       <keyword>visited</keyword>
     </context>
 
+    <context id="lang-selector-argument">
+      <start>(?&lt;=:lang)\(</start>
+      <end>\)</end>
+      <include>
+        <context sub-pattern="0" where="start" style-ref="function"/>
+        <context sub-pattern="0" where="end" style-ref="function"/>
+        <context ref="comment"/>
+      </include>
+    </context>
+
+    <context id="not-selector-nested-not-without-argument-error" style-ref="error">
+      <match>:not(?!\()</match>
+    </context>
+
+    <context id="not-selector-nested-not-with-argument-error" style-ref="error">
+      <start>:not\(</start>
+      <end>\)</end>
+    </context>
+
+    <context id="not-selector-argument">
+      <start>(?&lt;=:not)\(</start>
+      <end>\)</end>
+      <include>
+        <context sub-pattern="0" where="start" style-ref="function"/>
+        <context sub-pattern="0" where="end" style-ref="function"/>
+        <context ref="comment"/>
+        <context ref="not-selector-nested-not-without-argument-error"/>
+        <context ref="not-selector-nested-not-with-argument-error"/>
+        <context ref="namespace-qualifier"/>
+        <context ref="selector-grammar"/>
+        <context ref="selector-id"/>
+        <context ref="selector-class"/>
+        <context ref="selector-tagname"/>
+        <context ref="attribute-selector"/>
+        <context ref="selector-vendor-specific-pseudo-elements-classes"/>
+        <context ref="selector-pseudo-classes"/>
+        <context ref="lang-selector-argument"/>
+        <context ref="selector-nth-argument"/>
+      </include>
+    </context>
+
     <context id="selector-nth-argument-keywords" style-ref="property-values">
       <keyword>even</keyword>
       <keyword>odd</keyword>
@@ -1692,6 +1733,7 @@
       <include>
         <context sub-pattern="0" where="start" style-ref="function"/>
         <context sub-pattern="0" where="end" style-ref="function"/>
+        <context ref="comment"/>
         <context ref="selector-nth-argument-keywords"/>
         <context ref="selector-nth-argument-An-plus-B"/>
       </include>
@@ -1709,6 +1751,8 @@
         <context ref="selector-pseudo-elements-one-colon"/>
         <context ref="selector-pseudo-elements"/>
         <context ref="selector-pseudo-classes"/>
+        <context ref="lang-selector-argument"/>
+        <context ref="not-selector-argument"/>
         <context ref="selector-nth-argument"/>
         <context ref="comma"/>
       </include>
diff --git a/tests/syntax-highlighting/file.css b/tests/syntax-highlighting/file.css
index 6945156..6bf633c 100644
--- a/tests/syntax-highlighting/file.css
+++ b/tests/syntax-highlighting/file.css
@@ -38,6 +38,18 @@ p + div {
 
 ul::before {}
 
+:lang(fr) > q {
+    quotes: '« ' ' »';
+}
+
+p:not(.fancy) {
+    color: green;
+}
+
+body :not(p) {
+    text-decoration: underline;
+}
+
 li:nth-child(2n+1) {}
 
 link:hover {}