| // 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 "base/files/file_util.h" |
| #include "tools/gn/err.h" |
| #include "tools/gn/filesystem_utils.h" |
| #include "tools/gn/functions.h" |
| #include "tools/gn/input_conversion.h" |
| #include "tools/gn/input_file.h" |
| #include "tools/gn/scheduler.h" |
| |
| // TODO(brettw) consider removing this. I originally wrote it for making the |
| // WebKit bindings but misundersood what was required, and didn't need to |
| // use this. This seems to have a high potential for misuse. |
| |
| namespace functions { |
| |
| const char kReadFile[] = "read_file"; |
| const char kReadFile_HelpShort[] = |
| "read_file: Read a file into a variable."; |
| const char kReadFile_Help[] = |
| "read_file: Read a file into a variable.\n" |
| "\n" |
| " read_file(filename, input_conversion)\n" |
| "\n" |
| " Whitespace will be trimmed from the end of the file. Throws an error\n" |
| " if the file can not be opened.\n" |
| "\n" |
| "Arguments:\n" |
| "\n" |
| " filename\n" |
| " Filename to read, relative to the build file.\n" |
| "\n" |
| " input_conversion\n" |
| " Controls how the file is read and parsed.\n" |
| " See \"gn help input_conversion\".\n" |
| "\n" |
| "Example\n" |
| " lines = read_file(\"foo.txt\", \"list lines\")\n"; |
| |
| Value RunReadFile(Scope* scope, |
| const FunctionCallNode* function, |
| const std::vector<Value>& args, |
| Err* err) { |
| if (args.size() != 2) { |
| *err = Err(function->function(), "Wrong number of arguments to read_file", |
| "I expected two arguments."); |
| return Value(); |
| } |
| if (!args[0].VerifyTypeIs(Value::STRING, err)) |
| return Value(); |
| |
| // Compute the file name. |
| const SourceDir& cur_dir = scope->GetSourceDir(); |
| SourceFile source_file = cur_dir.ResolveRelativeFile(args[0], err, |
| scope->settings()->build_settings()->root_path_utf8()); |
| if (err->has_error()) |
| return Value(); |
| base::FilePath file_path = |
| scope->settings()->build_settings()->GetFullPath(source_file); |
| |
| // Ensure that everything is recomputed if the read file changes. |
| g_scheduler->AddGenDependency(file_path); |
| |
| // Read contents. |
| std::string file_contents; |
| if (!base::ReadFileToString(file_path, &file_contents)) { |
| *err = Err(args[0], "Could not read file.", |
| "I resolved this to \"" + FilePathToUTF8(file_path) + "\"."); |
| return Value(); |
| } |
| |
| return ConvertInputToValue(scope->settings(), file_contents, function, |
| args[1], err); |
| } |
| |
| } // namespace functions |