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