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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
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// 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 "tools/gn/err.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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namespace functions {
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const char kSetDefaults[] = "set_defaults";
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const char kSetDefaults_HelpShort[] =
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"set_defaults: Set default values for a target type.";
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const char kSetDefaults_Help[] =
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R"(set_defaults: Set default values for a target type.
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set_defaults(<target_type_name>) { <values...> }
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Sets the default values for a given target type. Whenever target_type_name is
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seen in the future, the values specified in set_default's block will be
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copied into the current scope.
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When the target type is used, the variable copying is very strict. If a
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variable with that name is already in scope, the build will fail with an
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error.
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set_defaults can be used for built-in target types ("executable",
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"shared_library", etc.) and custom ones defined via the "template" command.
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It can be called more than once and the most recent call in any scope will
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apply, but there is no way to refer to the previous defaults and modify them
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(each call to set_defaults must supply a complete list of all defaults it
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wants). If you want to share defaults, store them in a separate variable.
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Example
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set_defaults("static_library") {
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configs = [ "//tools/mything:settings" ]
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}
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static_library("mylib")
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# The configs will be auto-populated as above. You can remove it if
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# you don't want the default for a particular default:
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configs -= [ "//tools/mything:settings" ]
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}
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)";
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Value RunSetDefaults(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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BlockNode* block,
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Err* err) {
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if (!EnsureSingleStringArg(function, args, err))
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return Value();
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const std::string& target_type(args[0].string_value());
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if (!block) {
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FillNeedsBlockError(function, err);
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return Value();
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}
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// Run the block for the rule invocation.
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Scope block_scope(scope);
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block->Execute(&block_scope, err);
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if (err->has_error())
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return Value();
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// Now copy the values set on the scope we made into the free-floating one
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// (with no containing scope) used to hold the target defaults.
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Scope* dest = scope->MakeTargetDefaults(target_type);
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block_scope.NonRecursiveMergeTo(dest, Scope::MergeOptions(), function,
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"<SHOULD NOT FAIL>", err);
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return Value();
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}
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} // namespace functions
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