From a4716732437dd9407b6de02036bc93924cd04b79 Mon Sep 17 00:00:00 2001
From: xzyfer <xzyfer@gmail.com>
Date: Mon, 6 Oct 2014 15:53:11 +1100
Subject: [PATCH] Don't error on css variable syntax

---
 parser.cpp   | 3 +++
 prelexer.cpp | 5 +++++
 prelexer.hpp | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/parser.cpp b/parser.cpp
index fcb924e465..7ede684b97 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -745,6 +745,9 @@ namespace Sass {
     else if (lex< sequence< optional< exactly<'*'> >, identifier > >()) {
       prop = new (ctx.mem) String_Constant(path, source_position, lexed);
     }
+    else if (lex< custom_property_name >()) {
+      prop = new (ctx.mem) String_Constant(path, source_position, lexed);
+    }
     else {
       error("invalid property name");
     }
diff --git a/prelexer.cpp b/prelexer.cpp
index f0de5f990a..0dde79f1dd 100644
--- a/prelexer.cpp
+++ b/prelexer.cpp
@@ -166,6 +166,11 @@ namespace Sass {
                                                 backslash_something > > >(src);
     }
 
+    // Match CSS css variables.
+    const char* custom_property_name(const char* src) {
+      return sequence< exactly<'-'>, exactly<'-'>, identifier >(src);
+    }
+
     // Match interpolant schemas
     const char* identifier_schema(const char* src) {
       // follows this pattern: (x*ix*)+ ... well, not quite
diff --git a/prelexer.hpp b/prelexer.hpp
index e2f4756ed9..d0ad75409d 100644
--- a/prelexer.hpp
+++ b/prelexer.hpp
@@ -320,6 +320,8 @@ namespace Sass {
 
     const char* backslash_something(const char* src);
 
+    // Match CSS css variables.
+    const char* custom_property_name(const char* src);
     // Match a CSS identifier.
     const char* identifier(const char* src);
     // Match selector names.