Working on better url scanning.

Author: Aaron Leung

prelexer.cpp

@@ -383,5 +383,32 @@ namespace Sass {
     const char* folders(const char* src) {
       return zero_plus< folder >(src);
     }
+
+    const char* chunk(const char* src) {
+      char inside_str = 0;
+      const char* p = src;
+      size_t depth = 0;
+      while (true) {
+        if (!*p) {
+          return 0;
+        }
+        else if (!inside_str && (*p == '"' || *p == '\'')) {
+          inside_str = *p;
+        }
+        else if (*p == inside_str && *(p-1) != '\\') {
+          inside_str = 0;
+        }
+        else if (*p == '(' && !inside_str) {
+          ++depth;
+        }
+        else if (*p == ')' && !inside_str) {
+          if (depth == 0) return p;
+          else            --depth;
+        }
+        ++p;
+      }
+      // unreachable
+      return 0;
+    }
   }
 }

prelexer.hpp

@@ -447,5 +447,7 @@ namespace Sass {
       }
       return counter;
     }
+
+    const char* chunk(const char* src);
   }
 }