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// 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_
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