Added a matcher for SCSS variable names.

src/prelexer.cpp

@@ -151,5 +151,10 @@ namespace Sass {
       return spaces(src);
     }
     
+    // Match SCSS variable names.
+    char* variable(char* src) {
+      return sequence<exactly<'$'>, name>(src);
+    }
+
   }
 }
\ No newline at end of file

src/prelexer.hpp

@@ -246,6 +246,9 @@ namespace Sass {
     char* parent_of(char* src);
     char* ancestor_of(char* src);
     
+    // Match SCSS variable names.
+    char* variable(char* src);
+    
     // Utility functions for finding and counting characters in a string.
     template<char c>
     char* find_first(char* src) {

src/unit-test-prelexer.cpp

@@ -47,6 +47,8 @@ char hex1[]     = "#1a2b3c#f1ab";
 char hex2[]     = "#abc-zippo";
 char nonhex1[]  = "#ab blah";
 char nonhex2[]  = "#abc123blah";
+char var1[]     = "$hello blah";
+char nonvar1[]  = "$ hello";
 
 extern const char slash_star[] = "/*";
 
@@ -88,6 +90,7 @@ int main() {
   check_twice(spaces_and_comments, ws1, num1);
   check_twice(hex, hex1, nonhex1);
   check_twice(hex, hex2, nonhex2);
+  check_twice(variable, var1, nonvar1);
   cout << count_interval<'\n'>(ws1, spaces_and_comments(ws1)) << endl;
   cout << count_interval<'*'>(ws1, spaces_and_comments(ws1)) << endl;
   cout << count_interval<exactly<slash_star> >(ws1, spaces_and_comments(ws1)) << endl;