GN generator for GYP actions

tools/gn/source_dir.cc

 // Copyright (c) 2013 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/source_dir.h"
 
 #include "base/logging.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/source_file.h"
 
 namespace {
 
 void AssertValueSourceDirString(const std::string& s) {
-  DCHECK(!s.empty());
-  DCHECK(s[0] == '/');
-  DCHECK(EndsWithSlash(s));
+  if (!s.empty()) {
+    DCHECK(s[0] == '/');
+    DCHECK(EndsWithSlash(s));
+  }
 }
 
 }  // namespace
 
 SourceDir::SourceDir() {
 }
 
 SourceDir::SourceDir(const base::StringPiece& p)
     : value_(p.data(), p.size()) {
   if (!EndsWithSlash(value_))
     value_.push_back('/');
   AssertValueSourceDirString(value_);
 }
 
+SourceDir::SourceDir(SwapIn, std::string* s) {
+  value_.swap(*s);
+  if (!EndsWithSlash(value_))
+    value_.push_back('/');
+  AssertValueSourceDirString(value_);
+}
+
 SourceDir::~SourceDir() {
 }
 
 SourceFile SourceDir::ResolveRelativeFile(
     const base::StringPiece& p,
     const base::StringPiece& source_root) const {
   SourceFile ret;
 
   // It's an error to resolve an empty string or one that is a directory
   // (indicated by a trailing slash) because this is the function that expects
@@ skipping 84 matching lines @@
     ConvertPathToSystem(&converted);
     return base::FilePath(UTF8ToFilePath(converted));
   }
 
   // String the double-leading slash for source-relative paths.
   converted.assign(&value_[2], value_.size() - 2);
   ConvertPathToSystem(&converted);
   return source_root.Append(UTF8ToFilePath(converted));
 }
 
-void SourceDir::SwapInValue(std::string* v) {
+void SourceDir::SwapValue(std::string* v) {
   value_.swap(*v);
   AssertValueSourceDirString(value_);
 }