Enhance GN introspection

tools/gn/label_pattern.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/label_pattern.h"
 
 #include "base/strings/string_util.h"
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/value.h"
@@ skipping 198 matching lines @@
     type = RECURSIVE_DIRECTORY;
   } else {
     // Everything else should be of the form "foo:*".
     type = DIRECTORY;
   }
 
   // When we're doing wildcard matching, the name is always empty.
   return LabelPattern(type, dir, base::StringPiece(), toolchain_label);
 }
 
+bool LabelPattern::HasWildcard(const std::string& str) {
+  // Just look for a star. In the future, we may want to handle escaping or
+  // other types of patterns.
+  return str.find('*') != std::string::npos;
+}
+
 bool LabelPattern::Matches(const Label& label) const {
   if (!toolchain_.is_null()) {
     // Toolchain must match exactly.
     if (toolchain_.dir() != label.toolchain_dir() ||
         toolchain_.name() != label.toolchain_name())
       return false;
   }
 
   switch (type_) {
     case MATCH:
@@ skipping 26 matching lines @@
       break;
   }
 
   if (!toolchain_.is_null()) {
     result.push_back('(');
     result.append(toolchain_.GetUserVisibleName(false));
     result.push_back(')');
   }
   return result;
 }