tools/gn/function_process_file_template.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "tools/gn/file_template.h"
   6 #include "tools/gn/functions.h"
   7 #include "tools/gn/parse_tree.h"
   8
   9 namespace functions {
  10
  11 const char kProcessFileTemplate[] = "process_file_template";
  12 const char kProcessFileTemplate_Help[] =
  13     "process_file_template: Do template expansion over a list of files.\n"
  14     "\n"
  15     "  process_file_template(source_list, template)\n"
  16     "\n"
  17     "  process_file_template applies a template list to a source file list,\n"
  18     "  returning the result of applying each template to each source. This is\n"
  19     "  typically used for computing output file names from input files.\n"
  20     "\n"
  21     "Arguments:\n"
  22     "\n"
  23     "  The source_list is a list of file names.\n"
  24     "\n"
  25     "  The template can be a string or a list. If it is a list, multiple\n"
  26     "  output strings are generated for each input.\n"
  27     "\n"
  28     "  The following template substrings are used in the template arguments\n"
  29     "  and are replaced with the corresponding part of the input file name:\n"
  30     "\n"
  31     "    {{source}}\n"
  32     "        The entire source name.\n"
  33     "\n"
  34     "    {{source_name_part}}\n"
  35     "        The source name with no path or extension.\n"
  36     "\n"
  37     "Example:\n"
  38     "\n"
  39     "  sources = [\n"
  40     "    \"foo.idl\",\n"
  41     "    \"bar.idl\",\n"
  42     "  ]\n"
  43     "  myoutputs = process_file_template(\n"
  44     "      sources,\n"
  45     "      [ \"$target_gen_dir/{{source_name_part}}.cc\",\n"
  46     "        \"$target_gen_dir/{{source_name_part}}.h\" ])\n"
  47     "\n"
  48     " The result in this case will be:\n"
  49     "    [ \"//out/Debug/foo.cc\"\n"
  50     "      \"//out/Debug/foo.h\"\n"
  51     "      \"//out/Debug/bar.cc\"\n"
  52     "      \"//out/Debug/bar.h\" ]\n";
  53
  54 Value RunProcessFileTemplate(Scope* scope,
  55                              const FunctionCallNode* function,
  56                              const std::vector<Value>& args,
  57                              Err* err) {
  58   if (args.size() != 2) {
  59     *err = Err(function->function(), "Expected two arguments");
  60     return Value();
  61   }
  62
  63   FileTemplate file_template(args[1], err);
  64   if (err->has_error())
  65     return Value();
  66
  67   Value ret(function, Value::LIST);
  68   file_template.Apply(args[0], function, &ret.list_value(), err);
  69   return ret;
  70 }
  71
  72 }  // namespace functions