Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/source_dir.h

-// 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.
-
-#ifndef TOOLS_GN_SOURCE_DIR_H_
-#define TOOLS_GN_SOURCE_DIR_H_
-
-#include <string>
-
-#include "base/containers/hash_tables.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/strings/string_piece.h"
-
-class SourceFile;
-
-// Represents a directory within the source tree. Source dirs begin and end in
-// slashes.
-//
-// If there is one slash at the beginning, it will mean a system-absolute file
-// path. On Windows, absolute system paths will be of the form "/C:/foo/bar".
-//
-// Two slashes at the beginning indicate a path relative to the source root.
-class SourceDir {
- public:
-  SourceDir();
-  explicit SourceDir(const base::StringPiece& p);
-  ~SourceDir();
-
-  // Resolves a file or dir name relative to this source directory. Will return
-  // an empty SourceDir/File on error. Empty input is always an error (it's
-  // possible we should say ResolveRelativeDir vs. an empty string should be
-  // the source dir, but we require "." instead).
-  SourceFile ResolveRelativeFile(const base::StringPiece& p) const;
-  SourceDir ResolveRelativeDir(const base::StringPiece& p) const;
-
-  // Resolves this source file relative to some given source root. Returns
-  // an empty file path on error.
-  base::FilePath Resolve(const base::FilePath& source_root) const;
-
-  bool is_null() const { return value_.empty(); }
-  const std::string& value() const { return value_; }
-
-  // Returns true if this path starts with a "//" which indicates a path
-  // from the source root.
-  bool is_source_absolute() const {
-    return value_.size() >= 2 && value_[0] == '/' && value_[1] == '/';
-  }
-
-  // Returns true if this path starts with a single slash which indicates a
-  // system-absolute path.
-  bool is_system_absolute() const {
-    return !is_source_absolute();
-  }
-
-  // Returns a source-absolute path starting with only one slash at the
-  // beginning (normally source-absolute paths start with two slashes to mark
-  // them as such). This is normally used when concatenating directories
-  // together.
-  //
-  // This function asserts that the directory is actually source-absolute. The
-  // return value points into our buffer.
-  base::StringPiece SourceAbsoluteWithOneSlash() const {
-    CHECK(is_source_absolute());
-    return base::StringPiece(&value_[1], value_.size() - 1);
-  }
-
-  void SwapInValue(std::string* v);
-
-  bool operator==(const SourceDir& other) const {
-    return value_ == other.value_;
-  }
-  bool operator!=(const SourceDir& other) const {
-    return !operator==(other);
-  }
-  bool operator<(const SourceDir& other) const {
-    return value_ < other.value_;
-  }
-
- private:
-  friend class SourceFile;
-  std::string value_;
-
-  // Copy & assign supported.
-};
-
-namespace BASE_HASH_NAMESPACE {
-
-#if defined(COMPILER_GCC)
-template<> struct hash<SourceDir> {
-  std::size_t operator()(const SourceDir& v) const {
-    hash<std::string> h;
-    return h(v.value());
-  }
-};
-#elif defined(COMPILER_MSVC)
-inline size_t hash_value(const SourceDir& v) {
-  return hash_value(v.value());
-}
-#endif  // COMPILER...
-
-}  // namespace BASE_HASH_NAMESPACE
-
-#endif  // TOOLS_GN_SOURCE_DIR_H_