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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/action_target_generator.h"
#include "tools/gn/build_settings.h"
#include "tools/gn/err.h"
#include "tools/gn/filesystem_utils.h"
#include "tools/gn/parse_tree.h"
#include "tools/gn/scope.h"
#include "tools/gn/value.h"
#include "tools/gn/value_extractors.h"
#include "tools/gn/variables.h"
namespace {
// Returns true if the list of files looks like it might have a {{ }} pattern
// in it. Used for error checking.
bool FileListHasPattern(const Target::FileList& files) {
for (size_t i = 0; i < files.size(); i++) {
if (files[i].value().find("{{") != std::string::npos &&
files[i].value().find("}}") != std::string::npos)
return true;
}
return false;
}
} // namespace
ActionTargetGenerator::ActionTargetGenerator(
Target* target,
Scope* scope,
const FunctionCallNode* function_call,
Target::OutputType type,
Err* err)
: TargetGenerator(target, scope, function_call, err),
output_type_(type) {
}
ActionTargetGenerator::~ActionTargetGenerator() {
}
void ActionTargetGenerator::DoRun() {
target_->set_output_type(output_type_);
FillSources();
if (err_->has_error())
return;
if (output_type_ == Target::ACTION_FOREACH && target_->sources().empty()) {
// Foreach rules must always have some sources to have an effect.
*err_ = Err(function_call_, "action_foreach target has no sources.",
"If you don't specify any sources, there is nothing to run your\n"
"script over.");
return;
}
FillSourcePrereqs();
if (err_->has_error())
return;
FillScript();
if (err_->has_error())
return;
FillScriptArgs();
if (err_->has_error())
return;
FillOutputs();
if (err_->has_error())
return;
FillDepfile();
if (err_->has_error())
return;
CheckOutputs();
if (err_->has_error())
return;
// Action outputs don't depend on the current toolchain so we can skip adding
// that dependency.
}
void ActionTargetGenerator::FillScript() {
// If this gets called, the target type requires a script, so error out
// if it doesn't have one.
const Value* value = scope_->GetValue(variables::kScript, true);
if (!value) {
*err_ = Err(function_call_, "This target type requires a \"script\".");
return;
}
if (!value->VerifyTypeIs(Value::STRING, err_))
return;
target_->action_values().set_script(
scope_->GetSourceDir().ResolveRelativeFile(value->string_value()));
}
void ActionTargetGenerator::FillScriptArgs() {
const Value* value = scope_->GetValue(variables::kArgs, true);
if (!value)
return;
std::vector<std::string> args;
if (!ExtractListOfStringValues(*value, &args, err_))
return;
target_->action_values().swap_in_args(&args);
}
void ActionTargetGenerator::FillDepfile() {
const Value* value = scope_->GetValue(variables::kDepfile, true);
if (!value)
return;
target_->action_values().set_depfile(
scope_->settings()->build_settings()->build_dir().ResolveRelativeFile(
value->string_value()));
}
void ActionTargetGenerator::CheckOutputs() {
const Target::FileList& outputs = target_->action_values().outputs();
if (outputs.empty()) {
*err_ = Err(function_call_, "Action has no outputs.",
"If you have no outputs, the build system can not tell when your\n"
"script needs to be run.");
return;
}
if (output_type_ == Target::ACTION) {
// Make sure the outputs for an action have no patterns in them.
if (FileListHasPattern(outputs)) {
*err_ = Err(function_call_, "Action has patterns in the output.",
"An action target should have the outputs completely specified. If\n"
"you want to provide a mapping from source to output, use an\n"
"\"action_foreach\" target.");
return;
}
} else if (output_type_ == Target::ACTION_FOREACH) {
// A foreach target should always have a pattern in the outputs.
if (!FileListHasPattern(outputs)) {
*err_ = Err(function_call_,
"action_foreach should have a pattern in the output.",
"An action_foreach target should have a source expansion pattern in\n"
"it to map source file to unique output file name. Otherwise, the\n"
"build system can't determine when your script needs to be run.");
return;
}
}
}
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