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// 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/functions.h"
#include "tools/gn/parse_tree.h"
#include "tools/gn/scope.h"
#include "tools/gn/settings.h"
#include "tools/gn/substitution_list.h"
#include "tools/gn/substitution_writer.h"
#include "tools/gn/target.h"
#include "tools/gn/value_extractors.h"
namespace functions {
const char kProcessFileTemplate[] = "process_file_template";
const char kProcessFileTemplate_HelpShort[] =
"process_file_template: Do template expansion over a list of files.";
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"
" In most cases, get_target_outputs() will give the same result with\n"
" shorter, more maintainable code. This function should only be used\n"
" when that function can't be used (like there's no target or the target\n"
" is defined in another build file).\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 template should contain source expansions to which each name in\n"
" the source list is applied. See \"gn help source_expansion\".\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();
}
// Source list.
Target::FileList input_files;
if (!ExtractListOfRelativeFiles(scope->settings()->build_settings(), args[0],
scope->GetSourceDir(), &input_files, err))
return Value();
std::vector<std::string> result_files;
SubstitutionList subst;
// Template.
const Value& template_arg = args[1];
if (template_arg.type() == Value::STRING) {
// Convert the string to a SubstitutionList with one pattern in it to
// simplify the code below.
std::vector<std::string> list;
list.push_back(template_arg.string_value());
if (!subst.Parse(list, template_arg.origin(), err))
return Value();
} else if (template_arg.type() == Value::LIST) {
if (!subst.Parse(template_arg, err))
return Value();
} else {
*err = Err(template_arg, "Not a string or a list.");
return Value();
}
SubstitutionWriter::ApplyListToSourcesAsString(
scope->settings(), subst, input_files, &result_files);
// Convert the list of strings to the return Value.
Value ret(function, Value::LIST);
ret.list_value().reserve(result_files.size());
for (const auto& file : result_files)
ret.list_value().push_back(Value(function, file));
return ret;
}
} // namespace functions
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