blob: 5ad8f6279b4206d2f660fd5d2f3d6af67ca8e636 [file] [log] [blame]
// 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_FILE_H_
#define TOOLS_GN_SOURCE_FILE_H_
#include <stddef.h>
#include <algorithm>
#include <string>
#include <string_view>
#include "base/containers/flat_set.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "gn/string_atom.h"
class SourceDir;
// Represents a file within the source tree. Always begins in a slash, never
// ends in one.
class SourceFile {
public:
// This should be sequential integers starting from 0 so they can be used as
// array indices.
enum Type {
SOURCE_UNKNOWN = 0,
SOURCE_ASM,
SOURCE_C,
SOURCE_CPP,
SOURCE_H,
SOURCE_M,
SOURCE_MM,
SOURCE_MODULEMAP,
SOURCE_S,
SOURCE_RC,
SOURCE_O, // Object files can be inputs, too. Also counts .obj.
SOURCE_DEF,
SOURCE_RS,
SOURCE_GO,
SOURCE_SWIFT,
SOURCE_SWIFTMODULE,
// Must be last.
SOURCE_NUMTYPES,
};
SourceFile() = default;
// Takes a known absolute source file. Always begins in a slash.
explicit SourceFile(const std::string& value);
explicit SourceFile(std::string&& value);
explicit SourceFile(StringAtom value);
~SourceFile() = default;
bool is_null() const { return value_.empty(); }
const std::string& value() const { return value_.str(); }
Type type() const { return type_; }
// Returns everything after the last slash.
std::string GetName() const;
SourceDir GetDir() 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;
// Returns true if this file 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 file 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 names together.
//
// This function asserts that the file is actually source-absolute. The
// return value points into our buffer.
std::string_view SourceAbsoluteWithOneSlash() const {
CHECK(is_source_absolute());
return std::string_view(&value()[1], value().size() - 1);
}
bool operator==(const SourceFile& other) const {
return value_ == other.value_;
}
bool operator!=(const SourceFile& other) const { return !operator==(other); }
bool operator<(const SourceFile& other) const {
return value_ < other.value_;
}
struct PtrCompare {
bool operator()(const SourceFile& a, const SourceFile& b) const noexcept {
return StringAtom::PtrCompare()(a.value_, b.value_);
}
};
struct PtrHash {
size_t operator()(const SourceFile& s) const noexcept {
return StringAtom::PtrHash()(s.value_);
}
};
struct PtrEqual {
bool operator()(const SourceFile& a, const SourceFile& b) const noexcept {
return StringAtom::PtrEqual()(a.value_, b.value_);
}
};
private:
friend class SourceDir;
void SetValue(const std::string& value);
StringAtom value_;
Type type_ = SOURCE_UNKNOWN;
};
namespace std {
template <>
struct hash<SourceFile> {
std::size_t operator()(const SourceFile& v) const {
hash<std::string> h;
return h(v.value());
}
};
} // namespace std
// Represents a set of source files.
// NOTE: In practice, this is much faster than using an std::set<> or
// std::unordered_set<> container. E.g. for the Fuchsia Zircon build, the
// overall difference in "gn gen" time is about 10%.
using SourceFileSet = base::flat_set<SourceFile, SourceFile::PtrCompare>;
// Represents a set of tool types.
class SourceFileTypeSet {
public:
SourceFileTypeSet();
void Set(SourceFile::Type type) {
flags_[static_cast<int>(type)] = true;
empty_ = false;
}
bool Get(SourceFile::Type type) const {
return flags_[static_cast<int>(type)];
}
bool empty() const { return empty_; }
bool CSourceUsed() const;
bool RustSourceUsed() const;
bool GoSourceUsed() const;
bool SwiftSourceUsed() const;
bool MixedSourceUsed() const;
private:
bool empty_;
bool flags_[static_cast<int>(SourceFile::SOURCE_NUMTYPES)];
};
#endif // TOOLS_GN_SOURCE_FILE_H_