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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/stl_util.h"
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#include "tools/gn/functions.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/scope.h"
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#include "tools/gn/settings.h"
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#include "tools/gn/substitution_list.h"
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#include "tools/gn/substitution_writer.h"
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#include "tools/gn/target.h"
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#include "tools/gn/value_extractors.h"
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namespace functions {
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const char kProcessFileTemplate[] = "process_file_template";
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const char kProcessFileTemplate_HelpShort[] =
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"process_file_template: Do template expansion over a list of files.";
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const char kProcessFileTemplate_Help[] =
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R"(process_file_template: Do template expansion over a list of files.
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process_file_template(source_list, template)
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process_file_template applies a template list to a source file list,
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returning the result of applying each template to each source. This is
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typically used for computing output file names from input files.
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In most cases, get_target_outputs() will give the same result with shorter,
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more maintainable code. This function should only be used when that function
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can't be used (like there's no target or the target is defined in another
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build file).
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Arguments
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The source_list is a list of file names.
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The template can be a string or a list. If it is a list, multiple output
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strings are generated for each input.
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The template should contain source expansions to which each name in the
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source list is applied. See "gn help source_expansion".
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Example
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sources = [
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"foo.idl",
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"bar.idl",
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]
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myoutputs = process_file_template(
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sources,
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[ "$target_gen_dir/{{source_name_part}}.cc",
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"$target_gen_dir/{{source_name_part}}.h" ])
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The result in this case will be:
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[ "//out/Debug/foo.cc"
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"//out/Debug/foo.h"
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"//out/Debug/bar.cc"
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"//out/Debug/bar.h" ]
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)";
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Value RunProcessFileTemplate(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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Err* err) {
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if (args.size() != 2) {
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*err = Err(function->function(), "Expected two arguments");
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return Value();
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}
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// Source list.
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Target::FileList input_files;
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if (!ExtractListOfRelativeFiles(scope->settings()->build_settings(), args[0],
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scope->GetSourceDir(), &input_files, err))
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return Value();
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std::vector<std::string> result_files;
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SubstitutionList subst;
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// Template.
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const Value& template_arg = args[1];
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if (template_arg.type() == Value::STRING) {
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// Convert the string to a SubstitutionList with one pattern in it to
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// simplify the code below.
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std::vector<std::string> list;
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list.push_back(template_arg.string_value());
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if (!subst.Parse(list, template_arg.origin(), err))
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return Value();
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} else if (template_arg.type() == Value::LIST) {
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if (!subst.Parse(template_arg, err))
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return Value();
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} else {
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*err = Err(template_arg, "Not a string or a list.");
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return Value();
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}
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auto& types = subst.required_types();
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if (base::ContainsValue(types, SUBSTITUTION_SOURCE_TARGET_RELATIVE)) {
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*err = Err(template_arg, "Not a valid substitution type for the function.");
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return Value();
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}
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SubstitutionWriter::ApplyListToSourcesAsString(
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nullptr, scope->settings(), subst, input_files, &result_files);
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// Convert the list of strings to the return Value.
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Value ret(function, Value::LIST);
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ret.list_value().reserve(result_files.size());
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for (const auto& file : result_files)
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ret.list_value().push_back(Value(function, file));
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return ret;
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}
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} // namespace functions
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