| // 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 "gn/source_dir.h" |
| |
| #include <string> |
| |
| #include "base/logging.h" |
| #include "gn/filesystem_utils.h" |
| #include "gn/source_file.h" |
| #include "util/build_config.h" |
| |
| namespace { |
| |
| void AssertValueSourceDirString(std::string_view 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; |
| } |
| } |
| |
| // Validates input value (input_value) and sets proper error message. |
| // Note: Parameter blame_input is used only for generating error message. |
| bool ValidateResolveInput(bool as_file, |
| const Value& blame_input_value, |
| std::string_view input_value, |
| Err* err) { |
| if (as_file) { |
| // 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. |
| if (input_value.empty()) { |
| *err = Err(blame_input_value, "Empty file path.", |
| "You can't use empty strings as file paths."); |
| return false; |
| } else if (input_value[input_value.size() - 1] == '/') { |
| std::string help = "You specified the path\n "; |
| help.append(std::string(input_value)); |
| help.append( |
| "\nand it ends in a slash, indicating you think it's a directory." |
| "\nBut here you're supposed to be listing a file."); |
| *err = Err(blame_input_value, "File path ends in a slash.", help); |
| return false; |
| } |
| } else if (input_value.empty()) { |
| *err = Err(blame_input_value, "Empty directory path.", |
| "You can't use empty strings as directories."); |
| return false; |
| } |
| return true; |
| } |
| |
| static StringAtom SourceDirStringAtom(std::string_view s) { |
| if (EndsWithSlash(s)) { // Avoid allocation when possible. |
| AssertValueSourceDirString(s); |
| return StringAtom(s); |
| } |
| |
| std::string str; |
| str.reserve(s.size() + 1); |
| str += s; |
| str.push_back('/'); |
| AssertValueSourceDirString(str); |
| return StringAtom(str); |
| } |
| |
| } // namespace |
| |
| SourceDir::SourceDir(std::string_view s) : value_(SourceDirStringAtom(s)) {} |
| |
| std::string SourceDir::ResolveRelativeAs(bool as_file, |
| const Value& blame_input_value, |
| std::string_view input_value, |
| Err* err, |
| std::string_view source_root) const { |
| if (!ValidateResolveInput(as_file, blame_input_value, input_value, err)) { |
| return std::string(); |
| } |
| return ResolveRelative(input_value, value_.str(), as_file, source_root); |
| } |
| |
| SourceFile SourceDir::ResolveRelativeFile(const Value& p, |
| Err* err, |
| std::string_view source_root) const { |
| SourceFile ret; |
| |
| if (!p.VerifyTypeIs(Value::STRING, err)) |
| return ret; |
| |
| const std::string& input_string = p.string_value(); |
| if (!ValidateResolveInput(true, p, input_string, err)) |
| return ret; |
| |
| ret.SetValue(ResolveRelative(input_string, value_.str(), true, source_root)); |
| return ret; |
| } |
| |
| SourceDir SourceDir::ResolveRelativeDir(const Value& blame_input_value, |
| std::string_view input_value, |
| Err* err, |
| std::string_view source_root) const { |
| SourceDir ret; |
| ret.value_ = StringAtom(ResolveRelativeAs(false, blame_input_value, |
| input_value, err, source_root)); |
| return ret; |
| } |
| |
| std::string SourceDir::ResolveRelativeAs(bool as_file, |
| const Value& v, |
| Err* err, |
| std::string_view source_root, |
| const std::string* v_value) const { |
| if (!v.VerifyTypeIs(Value::STRING, err)) |
| return std::string(); |
| |
| if (!v_value) { |
| v_value = &v.string_value(); |
| } |
| std::string result = |
| ResolveRelativeAs(as_file, v, *v_value, err, source_root); |
| if (!as_file) |
| AssertValueSourceDirString(result); |
| return result; |
| } |
| |
| SourceDir SourceDir::ResolveRelativeDir(const Value& v, |
| Err* err, |
| std::string_view source_root) const { |
| if (!v.VerifyTypeIs(Value::STRING, err)) |
| return SourceDir(); |
| |
| return ResolveRelativeDir(v, v.string_value(), err, source_root); |
| } |
| |
| base::FilePath SourceDir::Resolve(const base::FilePath& source_root) const { |
| return ResolvePath(value_.str(), false, source_root); |
| } |