Refactor GN source expansions.

tools/gn/BUILD.gn

 # 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.
 
 defines = [ "GN_BUILD" ]
 
 static_library("gn_lib") {
   sources = [
     "action_target_generator.cc",
     "action_target_generator.h",
@@ skipping 26 matching lines @@
     "config_values_extractors.cc",
     "config_values_extractors.h",
     "config_values_generator.cc",
     "config_values_generator.h",
     "copy_target_generator.cc",
     "copy_target_generator.h",
     "err.cc",
     "err.h",
     "escape.cc",
     "escape.h",
-    "file_template.cc",
-    "file_template.h",
     "filesystem_utils.cc",
     "filesystem_utils.h",
     "functions.cc",
     "functions.h",
     "functions_target.cc",
     "function_exec_script.cc",
     "function_foreach.cc",
     "function_get_label_info.cc",
     "function_get_path_info.cc",
     "function_get_target_outputs.cc",
@@ skipping 66 matching lines @@
     "setup.cc",
     "setup.h",
     "source_dir.cc",
     "source_dir.h",
     "source_file.cc",
     "source_file.h",
     "standard_out.cc",
     "standard_out.h",
     "string_utils.cc",
     "string_utils.h",
+    "substitution_list.cc",
+    "substitution_list.h",
+    "substitution_pattern.cc",
+    "substitution_pattern.h",
+    "substitution_type.cc",
+    "substitution_type.h",
+    "substitution_writer.cc",
+    "substitution_writer.h",
     "target.cc",
     "target.h",
     "target_generator.cc",
     "target_generator.h",
     "template.cc",
     "template.h",
     "token.cc",
     "token.h",
     "tokenizer.cc",
     "tokenizer.h",
@@ skipping 23 matching lines @@
   ]
 
   deps = [
     ":gn_lib",
     "//build/util:last_change",
   ]
 }
 
 test("gn_unittests") {
   sources = [
+    "action_target_generator_unittest.cc",
     "builder_unittest.cc",
     "c_include_iterator_unittest.cc",
     "config_values_extractors_unittest.cc",
     "escape_unittest.cc",
     "filesystem_utils_unittest.cc",
-    "file_template_unittest.cc",
     "function_foreach_unittest.cc",
     "function_get_label_info_unittest.cc",
     "function_get_path_info_unittest.cc",
     "function_get_target_outputs_unittest.cc",
     "function_rebase_path_unittest.cc",
     "function_write_file_unittest.cc",
     "functions_target_unittest.cc",
     "functions_unittest.cc",
     "header_checker_unittest.cc",
     "input_conversion_unittest.cc",
     "label_unittest.cc",
     "loader_unittest.cc",
     "ninja_action_target_writer_unittest.cc",
     "ninja_binary_target_writer_unittest.cc",
     "ninja_copy_target_writer_unittest.cc",
     "ninja_helper_unittest.cc",
     "ninja_target_writer_unittest.cc",
     "operators_unittest.cc",
     "parse_tree_unittest.cc",
     "parser_unittest.cc",
     "path_output_unittest.cc",
     "pattern_unittest.cc",
     "run_all_unittests.cc",
     "scope_per_file_provider_unittest.cc",
     "scope_unittest.cc",
     "source_dir_unittest.cc",
     "string_utils_unittest.cc",
+    "substitution_pattern_unittest.cc",
+    "substitution_writer_unittest.cc",
     "target_generator_unittest.cc",
     "target_unittest.cc",
     "template_unittest.cc",
     "test_with_scope.cc",
     "test_with_scope.h",
     "tokenizer_unittest.cc",
     "value_unittest.cc",
     "visibility_unittest.cc",
   ]
   deps = [
     ":gn_lib",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }
 
 executable("generate_test_gn_data") {
   sources = [ "generate_test_gn_data.cc" ]
   deps = [ "//base" ]
 }