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

trunk/src/tools/gn/label.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_LABEL_H_
-#define TOOLS_GN_LABEL_H_
-
-#include "base/containers/hash_tables.h"
-#include "build/build_config.h"
-#include "tools/gn/source_dir.h"
-
-class Err;
-class Value;
-
-// A label represents the name of a target or some other named thing in
-// the source path. The label is always absolute and always includes a name
-// part, so it starts with a slash, and has one colon.
-class Label {
- public:
-  Label();
-
-  // Makes a label given an already-separate out path and name.
-  // See also Resolve().
-  Label(const SourceDir& dir,
-        const base::StringPiece& name,
-        const SourceDir& toolchain_dir,
-        const base::StringPiece& toolchain_name);
-  ~Label();
-
-  // Resolives a string from a build file that may be relative to the
-  // current directory into a fully qualified label. On failure returns an
-  // is_null() label and sets the error.
-  static Label Resolve(const SourceDir& current_dir,
-                       const Label& current_toolchain,
-                       const Value& input,
-                       Err* err);
-
-  bool is_null() const { return dir_.is_null(); }
-
-  const SourceDir& dir() const { return dir_; }
-  const std::string& name() const { return name_; }
-
-  const SourceDir& toolchain_dir() const { return toolchain_dir_; }
-  const std::string& toolchain_name() const { return toolchain_name_; }
-  Label GetToolchainLabel() const;
-
-  // Formats this label in a way that we can present to the user or expose to
-  // other parts of the system. SourceDirs end in slashes, but the user
-  // expects names like "//chrome/renderer:renderer_config" when printed. The
-  // toolchain is optionally included.
-  std::string GetUserVisibleName(bool include_toolchain) const;
-
-  // Like the above version, but automatically includes the toolchain if it's
-  // not the default one. Normally the user only cares about the toolchain for
-  // non-default ones, so this can make certain output more clear.
-  std::string GetUserVisibleName(const Label& default_toolchain) const;
-
-  bool operator==(const Label& other) const {
-    return name_ == other.name_ && dir_ == other.dir_ &&
-           toolchain_dir_ == other.toolchain_dir_ &&
-           toolchain_name_ == other.toolchain_name_;
-  }
-  bool operator!=(const Label& other) const {
-    return !operator==(other);
-  }
-  bool operator<(const Label& other) const {
-    // TODO(brettw) could be optimized to avoid an extra full string check
-    // (one for operator==, one for <).
-    if (dir_ != other.dir_)
-      return dir_ < other.dir_;
-    if (name_ != other.name_)
-      return name_ < other.name_;
-    if (toolchain_dir_ != other.toolchain_dir_)
-      return toolchain_dir_ < other.toolchain_dir_;
-    return toolchain_name_ < other.toolchain_name_;
-  }
-
-  // Returns true if the toolchain dir/name of this object matches some
-  // other object.
-  bool ToolchainsEqual(const Label& other) const {
-    return toolchain_dir_ == other.toolchain_dir_ &&
-           toolchain_name_ == other.toolchain_name_;
-  }
-
- private:
-  SourceDir dir_;
-  std::string name_;
-
-  SourceDir toolchain_dir_;
-  std::string toolchain_name_;
-};
-
-namespace BASE_HASH_NAMESPACE {
-
-#if defined(COMPILER_GCC)
-template<> struct hash<Label> {
-  std::size_t operator()(const Label& v) const {
-    hash<std::string> stringhash;
-    return ((stringhash(v.dir().value()) * 131 +
-             stringhash(v.name())) * 131 +
-            stringhash(v.toolchain_dir().value())) * 131 +
-           stringhash(v.toolchain_name());
-  }
-};
-#elif defined(COMPILER_MSVC)
-inline size_t hash_value(const Label& v) {
-  return ((hash_value(v.dir().value()) * 131 +
-           hash_value(v.name())) * 131 +
-          hash_value(v.toolchain_dir().value())) * 131 +
-         hash_value(v.toolchain_name());
-}
-#endif  // COMPILER...
-
-}  // namespace BASE_HASH_NAMESPACE
-
-#endif  // TOOLS_GN_LABEL_H_