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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/files/file_util.h"
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#include "tools/gn/err.h"
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#include "tools/gn/filesystem_utils.h"
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#include "tools/gn/functions.h"
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#include "tools/gn/input_conversion.h"
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#include "tools/gn/input_file.h"
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#include "tools/gn/scheduler.h"
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// TODO(brettw) consider removing this. I originally wrote it for making the
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// WebKit bindings but misundersood what was required, and didn't need to
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// use this. This seems to have a high potential for misuse.
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namespace functions {
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const char kReadFile[] = "read_file";
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const char kReadFile_HelpShort[] =
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"read_file: Read a file into a variable.";
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const char kReadFile_Help[] =
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R"(read_file: Read a file into a variable.
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read_file(filename, input_conversion)
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Whitespace will be trimmed from the end of the file. Throws an error if the
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file can not be opened.
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Arguments
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filename
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Filename to read, relative to the build file.
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input_conversion
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Controls how the file is read and parsed. See "gn help input_conversion".
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Example
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lines = read_file("foo.txt", "list lines")
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)";
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Value RunReadFile(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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Err* err) {
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if (args.size() != 2) {
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*err = Err(function->function(), "Wrong number of arguments to read_file",
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"I expected two arguments.");
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return Value();
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}
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if (!args[0].VerifyTypeIs(Value::STRING, err))
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return Value();
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// Compute the file name.
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const SourceDir& cur_dir = scope->GetSourceDir();
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SourceFile source_file = cur_dir.ResolveRelativeFile(args[0], err,
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scope->settings()->build_settings()->root_path_utf8());
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if (err->has_error())
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return Value();
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base::FilePath file_path =
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scope->settings()->build_settings()->GetFullPath(source_file);
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// Ensure that everything is recomputed if the read file changes.
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g_scheduler->AddGenDependency(file_path);
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// Read contents.
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std::string file_contents;
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if (!base::ReadFileToString(file_path, &file_contents)) {
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*err = Err(args[0], "Could not read file.",
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"I resolved this to \"" + FilePathToUTF8(file_path) + "\".");
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return Value();
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}
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return ConvertInputToValue(scope->settings(), file_contents, function,
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args[1], err);
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}
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} // namespace functions
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