45 lines
1.4 KiB
C++
45 lines
1.4 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 "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/value.h"
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namespace functions {
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const char kDefineRule[] = "define_rule";
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const char kDefileRule_Help[] =
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"TODO(brettw) write this.";
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Value RunDefineRule(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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// TODO(brettw) determine if the function is built-in and throw an error if
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// it is.
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if (args.size() != 1) {
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*err = Err(function->function(),
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"Need exactly one string arg to define_rule.");
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return Value();
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}
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if (!args[0].VerifyTypeIs(Value::STRING, err))
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return Value();
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std::string rule_name = args[0].string_value();
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const FunctionCallNode* existing_rule = scope->GetRule(rule_name);
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if (existing_rule) {
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*err = Err(function, "Duplicate rule definition.",
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"A rule with this name was already defined.");
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err->AppendSubErr(Err(existing_rule->function(), "Previous definition."));
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return Value();
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}
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scope->AddRule(rule_name, function);
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return Value();
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}
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} // namespace functions
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