49 lines
1.3 KiB
C++
Executable File
49 lines
1.3 KiB
C++
Executable File
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#include "tree/ErrorNode.h"
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#include "ParserRuleContext.h"
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#include "tree/ParseTreeListener.h"
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#include "support/CPPUtils.h"
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#include "support/Casts.h"
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#include "tree/IterativeParseTreeWalker.h"
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#include "tree/ParseTreeWalker.h"
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using namespace antlr4::tree;
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using namespace antlrcpp;
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static IterativeParseTreeWalker defaultWalker;
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ParseTreeWalker &ParseTreeWalker::DEFAULT = defaultWalker;
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void ParseTreeWalker::walk(ParseTreeListener *listener, ParseTree *t) const {
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if (ErrorNode::is(*t)) {
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listener->visitErrorNode(downCast<ErrorNode*>(t));
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return;
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}
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if (TerminalNode::is(*t)) {
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listener->visitTerminal(downCast<TerminalNode*>(t));
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return;
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}
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enterRule(listener, t);
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for (auto &child : t->children) {
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walk(listener, child);
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}
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exitRule(listener, t);
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}
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void ParseTreeWalker::enterRule(ParseTreeListener *listener, ParseTree *r) const {
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auto *ctx = downCast<ParserRuleContext*>(r);
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listener->enterEveryRule(ctx);
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ctx->enterRule(listener);
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}
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void ParseTreeWalker::exitRule(ParseTreeListener *listener, ParseTree *r) const {
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auto *ctx = downCast<ParserRuleContext*>(r);
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ctx->exitRule(listener);
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listener->exitEveryRule(ctx);
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}
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