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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.
#include "tools/gn/source_dir.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "tools/gn/filesystem_utils.h"
#include "tools/gn/source_file.h"
namespace {
void AssertValueSourceDirString(const std::string& s) {
if (!s.empty()) {
#if defined(OS_WIN)
DCHECK(s[0] == '/' ||
(s.size() > 2 && s[0] != '/' && s[1] == ':' && IsSlash(s[2])));
#else
DCHECK(s[0] == '/');
#endif
DCHECK(EndsWithSlash(s)) << s;
}
}
} // namespace
SourceDir::SourceDir() {
}
SourceDir::SourceDir(const base::StringPiece& p)
: value_(p.data(), p.size()) {
if (!EndsWithSlash(value_))
value_.push_back('/');
AssertValueSourceDirString(value_);
}
SourceDir::SourceDir(SwapIn, std::string* s) {
value_.swap(*s);
if (!EndsWithSlash(value_))
value_.push_back('/');
AssertValueSourceDirString(value_);
}
SourceDir::~SourceDir() {
}
SourceFile SourceDir::ResolveRelativeFile(
const Value& p,
Err* err,
const base::StringPiece& source_root) const {
SourceFile ret;
if (!p.VerifyTypeIs(Value::STRING, err))
return ret;
// It's an error to resolve an empty string or one that is a directory
// (indicated by a trailing slash) because this is the function that expects
// to return a file.
const std::string& str = p.string_value();
if (str.empty()) {
*err = Err(p, "Empty file path.",
"You can't use empty strings as file paths. That's just wrong.");
return ret;
} else if (str[str.size() - 1] == '/') {
*err = Err(p, "File path ends in a slash.",
"You specified the path\n " + str + "\n"
"and it ends in a slash, indicating you think it's a directory."
"\nBut here you're supposed to be listing a file.");
return ret;
}
if (str.size() >= 2 && str[0] == '/' && str[1] == '/') {
// Source-relative.
ret.value_.assign(str.data(), str.size());
NormalizePath(&ret.value_, source_root);
return ret;
} else if (IsPathAbsolute(str)) {
if (source_root.empty() ||
!MakeAbsolutePathRelativeIfPossible(source_root, str, &ret.value_)) {
#if defined(OS_WIN)
// On Windows we'll accept "C:\foo" as an absolute path, which we want
// to convert to "/C:..." here.
if (str[0] != '/')
ret.value_ = "/";
#endif
ret.value_.append(str.data(), str.size());
}
NormalizePath(&ret.value_);
return ret;
}
if (!source_root.empty()) {
std::string absolute =
FilePathToUTF8(Resolve(UTF8ToFilePath(source_root)).AppendASCII(
str).value());
NormalizePath(&absolute);
if (!MakeAbsolutePathRelativeIfPossible(source_root, absolute,
&ret.value_)) {
#if defined(OS_WIN)
// On Windows we'll accept "C:\foo" as an absolute path, which we want
// to convert to "/C:..." here.
if (absolute[0] != '/')
ret.value_ = "/";
#endif
ret.value_.append(absolute.data(), absolute.size());
}
return ret;
}
// With no source_root_, there's nothing we can do about
// e.g. p=../../../path/to/file and value_=//source and we'll
// errornously return //file.
ret.value_.reserve(value_.size() + str.size());
ret.value_.assign(value_);
ret.value_.append(str.data(), str.size());
NormalizePath(&ret.value_);
return ret;
}
SourceDir SourceDir::ResolveRelativeDir(
const Value& p,
Err* err,
const base::StringPiece& source_root) const {
if (!p.VerifyTypeIs(Value::STRING, err))
return SourceDir();
return ResolveRelativeDir(p, p.string_value(), err, source_root);
}
SourceDir SourceDir::ResolveRelativeDir(
const Value& blame_but_dont_use,
const base::StringPiece& str,
Err* err,
const base::StringPiece& source_root) const {
SourceDir ret;
if (str.empty()) {
*err = Err(blame_but_dont_use, "Empty directory path.",
"You can't use empty strings as directories. "
"That's just wrong.");
return ret;
}
if (str.size() >= 2 && str[0] == '/' && str[1] == '/') {
// Source-relative.
ret.value_.assign(str.data(), str.size());
if (!EndsWithSlash(ret.value_))
ret.value_.push_back('/');
NormalizePath(&ret.value_, source_root);
return ret;
} else if (IsPathAbsolute(str)) {
if (source_root.empty() ||
!MakeAbsolutePathRelativeIfPossible(source_root, str, &ret.value_)) {
#if defined(OS_WIN)
if (str[0] != '/') // See the file case for why we do this check.
ret.value_ = "/";
#endif
ret.value_.append(str.data(), str.size());
}
NormalizePath(&ret.value_);
if (!EndsWithSlash(ret.value_))
ret.value_.push_back('/');
return ret;
}
if (!source_root.empty()) {
std::string absolute =
FilePathToUTF8(Resolve(UTF8ToFilePath(source_root)).AppendASCII(
str.as_string()).value());
NormalizePath(&absolute);
if (!MakeAbsolutePathRelativeIfPossible(source_root, absolute,
&ret.value_)) {
#if defined(OS_WIN)
if (absolute[0] != '/') // See the file case for why we do this check.
ret.value_ = "/";
#endif
ret.value_.append(absolute.data(), absolute.size());
}
if (!EndsWithSlash(ret.value_))
ret.value_.push_back('/');
return ret;
}
ret.value_.reserve(value_.size() + str.size());
ret.value_.assign(value_);
ret.value_.append(str.data(), str.size());
NormalizePath(&ret.value_);
if (!EndsWithSlash(ret.value_))
ret.value_.push_back('/');
AssertValueSourceDirString(ret.value_);
return ret;
}
base::FilePath SourceDir::Resolve(const base::FilePath& source_root) const {
if (is_null())
return base::FilePath();
std::string converted;
if (is_system_absolute()) {
if (value_.size() > 2 && value_[2] == ':') {
// Windows path, strip the leading slash.
converted.assign(&value_[1], value_.size() - 1);
} else {
converted.assign(value_);
}
return base::FilePath(UTF8ToFilePath(converted));
}
// String the double-leading slash for source-relative paths.
converted.assign(&value_[2], value_.size() - 2);
return source_root.Append(UTF8ToFilePath(converted))
.NormalizePathSeparatorsTo('/');
}
void SourceDir::SwapValue(std::string* v) {
value_.swap(*v);
AssertValueSourceDirString(value_);
}
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