Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/function_read_file.cc

-// 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/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.
-
-/*
-read_file: Read a file into a variable.
-
-  read_file(filename, how_to_read)
-
-  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 "help input_conversion".
-
-Example:
-
-  lines = read_file("foo.txt", "list lines")
-*/
-Value ExecuteReadFile(Scope* scope,
-                      const FunctionCallNode* function,
-                      const std::vector<Value>& args,
-                      Err* err) {
-  if (args.size() != 2) {
-    *err = Err(function->function(), "Wrong number of args 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 = SourceDirForFunctionCall(function);
-  SourceFile source_file = cur_dir.ResolveRelativeFile(args[0].string_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(source_file);
-
-  // Read contents.
-  std::string file_contents;
-  if (!file_util::ReadFileToString(file_path, &file_contents)) {
-    *err = Err(args[0], "Could not read file.",
-               "I resolved this to \"" + FilePathToUTF8(file_path) + "\".");
-    return Value();
-  }
-
-  return ConvertInputToValue(file_contents, function, args[1], err);
-}