| // 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 "gn/err.h" |
| #include "gn/filesystem_utils.h" |
| #include "gn/functions.h" |
| #include "gn/input_conversion.h" |
| #include "gn/input_file.h" |
| #include "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[] = |
| R"(read_file: Read a file into a variable. |
| |
| read_file(filename, input_conversion) |
| |
| Whitespace will be trimmed from the end of the file. Throws an error if the |
| file can not be opened. |
| |
| Arguments |
| |
| filename |
| Filename to read, relative to the build file. |
| |
| input_conversion |
| Controls how the file is read and parsed. See "gn help io_conversion". |
| |
| Example |
| |
| lines = read_file("foo.txt", "list lines") |
| )"; |
| |
| 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 |