117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef TOOLS_GN_LABEL_H_
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#define TOOLS_GN_LABEL_H_
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#include "base/containers/hash_tables.h"
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#include "build/build_config.h"
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#include "tools/gn/source_dir.h"
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class Err;
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class Value;
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// A label represents the name of a target or some other named thing in
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// the source path. The label is always absolute and always includes a name
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// part, so it starts with a slash, and has one colon.
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class Label {
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public:
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Label();
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// Makes a label given an already-separate out path and name.
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// See also Resolve().
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Label(const SourceDir& dir,
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const base::StringPiece& name,
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const SourceDir& toolchain_dir,
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const base::StringPiece& toolchain_name);
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~Label();
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// Resolives a string from a build file that may be relative to the
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// current directory into a fully qualified label. On failure returns an
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// is_null() label and sets the error.
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static Label Resolve(const SourceDir& current_dir,
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const Label& current_toolchain,
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const Value& input,
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Err* err);
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bool is_null() const { return dir_.is_null(); }
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const SourceDir& dir() const { return dir_; }
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const std::string& name() const { return name_; }
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const SourceDir& toolchain_dir() const { return toolchain_dir_; }
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const std::string& toolchain_name() const { return toolchain_name_; }
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Label GetToolchainLabel() const;
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// Formats this label in a way that we can present to the user or expose to
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// other parts of the system. SourceDirs end in slashes, but the user
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// expects names like "//chrome/renderer:renderer_config" when printed. The
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// toolchain is optionally included.
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std::string GetUserVisibleName(bool include_toolchain) const;
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// Like the above version, but automatically includes the toolchain if it's
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// not the default one. Normally the user only cares about the toolchain for
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// non-default ones, so this can make certain output more clear.
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std::string GetUserVisibleName(const Label& default_toolchain) const;
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bool operator==(const Label& other) const {
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return name_ == other.name_ && dir_ == other.dir_ &&
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toolchain_dir_ == other.toolchain_dir_ &&
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toolchain_name_ == other.toolchain_name_;
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}
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bool operator!=(const Label& other) const {
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return !operator==(other);
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}
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bool operator<(const Label& other) const {
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// TODO(brettw) could be optimized to avoid an extra full string check
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// (one for operator==, one for <).
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if (dir_ != other.dir_)
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return dir_ < other.dir_;
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if (name_ != other.name_)
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return name_ < other.name_;
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if (toolchain_dir_ != other.toolchain_dir_)
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return toolchain_dir_ < other.toolchain_dir_;
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return toolchain_name_ < other.toolchain_name_;
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}
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// Returns true if the toolchain dir/name of this object matches some
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// other object.
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bool ToolchainsEqual(const Label& other) const {
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return toolchain_dir_ == other.toolchain_dir_ &&
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toolchain_name_ == other.toolchain_name_;
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}
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private:
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SourceDir dir_;
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std::string name_;
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SourceDir toolchain_dir_;
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std::string toolchain_name_;
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};
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namespace BASE_HASH_NAMESPACE {
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#if defined(COMPILER_GCC)
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template<> struct hash<Label> {
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std::size_t operator()(const Label& v) const {
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hash<std::string> stringhash;
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return ((stringhash(v.dir().value()) * 131 +
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stringhash(v.name())) * 131 +
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stringhash(v.toolchain_dir().value())) * 131 +
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stringhash(v.toolchain_name());
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}
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};
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#elif defined(COMPILER_MSVC)
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inline size_t hash_value(const Label& v) {
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return ((hash_value(v.dir().value()) * 131 +
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hash_value(v.name())) * 131 +
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hash_value(v.toolchain_dir().value())) * 131 +
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hash_value(v.toolchain_name());
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}
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#endif // COMPILER...
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} // namespace BASE_HASH_NAMESPACE
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#endif // TOOLS_GN_LABEL_H_
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