// 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 "tools/gn/file_template.h"
#include "tools/gn/functions.h"
#include "tools/gn/parse_tree.h"

namespace functions {

const char kProcessFileTemplate[] = "process_file_template";
const char kProcessFileTemplate_Help[] =
    "process_file_template: Do template expansion over a list of files.\n"
    "\n"
    "  process_file_template(source_list, template)\n"
    "\n"
    "  process_file_template applies a template list to a source file list,\n"
    "  returning the result of applying each template to each source. This is\n"
    "  typically used for computing output file names from input files.\n"
    "\n"
    "Arguments:\n"
    "\n"
    "  The source_list is a list of file names.\n"
    "\n"
    "  The template can be a string or a list. If it is a list, multiple\n"
    "  output strings are generated for each input.\n"
    "\n"
    "  The following template substrings are used in the template arguments\n"
    "  and are replaced with the corresponding part of the input file name:\n"
    "\n"
    "    {{source}}\n"
    "        The entire source name.\n"
    "\n"
    "    {{source_name_part}}\n"
    "        The source name with no path or extension.\n"
    "\n"
    "Example:\n"
    "\n"
    "  sources = [\n"
    "    \"foo.idl\",\n"
    "    \"bar.idl\",\n"
    "  ]\n"
    "  myoutputs = process_file_template(\n"
    "      sources,\n"
    "      [ \"$target_gen_dir/{{source_name_part}}.cc\",\n"
    "        \"$target_gen_dir/{{source_name_part}}.h\" ])\n"
    "\n"
    " The result in this case will be:\n"
    "    [ \"//out/Debug/foo.cc\"\n"
    "      \"//out/Debug/foo.h\"\n"
    "      \"//out/Debug/bar.cc\"\n"
    "      \"//out/Debug/bar.h\" ]\n";

Value RunProcessFileTemplate(Scope* scope,
                             const FunctionCallNode* function,
                             const std::vector<Value>& args,
                             Err* err) {
  if (args.size() != 2) {
    *err = Err(function->function(), "Expected two arguments");
    return Value();
  }

  FileTemplate file_template(args[1], err);
  if (err->has_error())
    return Value();

  Value ret(function, Value::LIST);
  file_template.Apply(args[0], function, &ret.list_value(), err);
  return ret;
}

}  // namespace functions