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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef TOOLS_GN_LABEL_H_ |
| 6 #define TOOLS_GN_LABEL_H_ |
| 7 |
| 8 #include "base/containers/hash_tables.h" |
| 9 #include "build/build_config.h" |
| 10 #include "tools/gn/source_dir.h" |
| 11 |
| 12 class Err; |
| 13 class Value; |
| 14 |
| 15 // A label represents the name of a target or some other named thing in |
| 16 // the source path. The label is always absolute and always includes a name |
| 17 // part, so it starts with a slash, and has one colon. |
| 18 class Label { |
| 19 public: |
| 20 Label(); |
| 21 |
| 22 // Makes a label given an already-separate out path and name. |
| 23 // See also Resolve(). |
| 24 Label(const SourceDir& dir, |
| 25 const base::StringPiece& name, |
| 26 const SourceDir& toolchain_dir, |
| 27 const base::StringPiece& toolchain_name); |
| 28 ~Label(); |
| 29 |
| 30 // Resolives a string from a build file that may be relative to the |
| 31 // current directory into a fully qualified label. On failure returns an |
| 32 // is_null() label and sets the error. |
| 33 static Label Resolve(const SourceDir& current_dir, |
| 34 const Label& current_toolchain, |
| 35 const Value& input, |
| 36 Err* err); |
| 37 |
| 38 bool is_null() const { return dir_.is_null(); } |
| 39 |
| 40 const SourceDir& dir() const { return dir_; } |
| 41 const std::string& name() const { return name_; } |
| 42 |
| 43 const SourceDir& toolchain_dir() const { return toolchain_dir_; } |
| 44 const std::string& toolchain_name() const { return toolchain_name_; } |
| 45 Label GetToolchainLabel() const; |
| 46 |
| 47 // Formats this label in a way that we can present to the user or expose to |
| 48 // other parts of the system. SourceDirs end in slashes, but the user |
| 49 // expects names like "//chrome/renderer:renderer_config" when printed. The |
| 50 // toolchain is optionally included. |
| 51 std::string GetUserVisibleName(bool include_toolchain) const; |
| 52 |
| 53 // Like the above version, but automatically includes the toolchain if it's |
| 54 // not the default one. Normally the user only cares about the toolchain for |
| 55 // non-default ones, so this can make certain output more clear. |
| 56 std::string GetUserVisibleName(const Label& default_toolchain) const; |
| 57 |
| 58 bool operator==(const Label& other) const { |
| 59 return name_ == other.name_ && dir_ == other.dir_ && |
| 60 toolchain_dir_ == other.toolchain_dir_ && |
| 61 toolchain_name_ == other.toolchain_name_; |
| 62 } |
| 63 bool operator!=(const Label& other) const { |
| 64 return !operator==(other); |
| 65 } |
| 66 bool operator<(const Label& other) const { |
| 67 // TODO(brettw) could be optimized to avoid an extra full string check |
| 68 // (one for operator==, one for <). |
| 69 if (dir_ != other.dir_) |
| 70 return dir_ < other.dir_; |
| 71 if (name_ != other.name_) |
| 72 return name_ < other.name_; |
| 73 if (toolchain_dir_ != other.toolchain_dir_) |
| 74 return toolchain_dir_ < other.toolchain_dir_; |
| 75 return toolchain_name_ < other.toolchain_name_; |
| 76 } |
| 77 |
| 78 // Returns true if the toolchain dir/name of this object matches some |
| 79 // other object. |
| 80 bool ToolchainsEqual(const Label& other) const { |
| 81 return toolchain_dir_ == other.toolchain_dir_ && |
| 82 toolchain_name_ == other.toolchain_name_; |
| 83 } |
| 84 |
| 85 private: |
| 86 SourceDir dir_; |
| 87 std::string name_; |
| 88 |
| 89 SourceDir toolchain_dir_; |
| 90 std::string toolchain_name_; |
| 91 }; |
| 92 |
| 93 namespace BASE_HASH_NAMESPACE { |
| 94 |
| 95 #if defined(COMPILER_GCC) |
| 96 template<> struct hash<Label> { |
| 97 std::size_t operator()(const Label& v) const { |
| 98 hash<std::string> stringhash; |
| 99 return ((stringhash(v.dir().value()) * 131 + |
| 100 stringhash(v.name())) * 131 + |
| 101 stringhash(v.toolchain_dir().value())) * 131 + |
| 102 stringhash(v.toolchain_name()); |
| 103 } |
| 104 }; |
| 105 #elif defined(COMPILER_MSVC) |
| 106 inline size_t hash_value(const Label& v) { |
| 107 return ((hash_value(v.dir().value()) * 131 + |
| 108 hash_value(v.name())) * 131 + |
| 109 hash_value(v.toolchain_dir().value())) * 131 + |
| 110 hash_value(v.toolchain_name()); |
| 111 } |
| 112 #endif // COMPILER... |
| 113 |
| 114 } // namespace BASE_HASH_NAMESPACE |
| 115 |
| 116 #endif // TOOLS_GN_LABEL_H_ |
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