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ANTLR Runtime Source Code
ANTLR is a powerful parser generator for multiple programming languages including Java.
ANTLR contains 2 major modules:
ANTLR Runtime Source Code files are provided in the distribution packge (antlr4-4.10.1.zip). You can download them at ANTLR Website.
You can also browse the source code below:
✍: FYIcenter
⏎ org/antlr/v4/runtime/tree/ParseTreeWalker.java
/* * 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. */ package org.antlr.v4.runtime.tree; import org.antlr.v4.runtime.ParserRuleContext; public class ParseTreeWalker { public static final ParseTreeWalker DEFAULT = new ParseTreeWalker(); /** * Performs a walk on the given parse tree starting at the root and going down recursively * with depth-first search. On each node, {@link ParseTreeWalker#enterRule} is called before * recursively walking down into child nodes, then * {@link ParseTreeWalker#exitRule} is called after the recursive call to wind up. * @param listener The listener used by the walker to process grammar rules * @param t The parse tree to be walked on */ public void walk(ParseTreeListener listener, ParseTree t) { if ( t instanceof ErrorNode) { listener.visitErrorNode((ErrorNode)t); return; } else if ( t instanceof TerminalNode) { listener.visitTerminal((TerminalNode)t); return; } RuleNode r = (RuleNode)t; enterRule(listener, r); int n = r.getChildCount(); for (int i = 0; i<n; i++) { walk(listener, r.getChild(i)); } exitRule(listener, r); } /** * Enters a grammar rule by first triggering the generic event {@link ParseTreeListener#enterEveryRule} * then by triggering the event specific to the given parse tree node * @param listener The listener responding to the trigger events * @param r The grammar rule containing the rule context */ protected void enterRule(ParseTreeListener listener, RuleNode r) { ParserRuleContext ctx = (ParserRuleContext)r.getRuleContext(); listener.enterEveryRule(ctx); ctx.enterRule(listener); } /** * Exits a grammar rule by first triggering the event specific to the given parse tree node * then by triggering the generic event {@link ParseTreeListener#exitEveryRule} * @param listener The listener responding to the trigger events * @param r The grammar rule containing the rule context */ protected void exitRule(ParseTreeListener listener, RuleNode r) { ParserRuleContext ctx = (ParserRuleContext)r.getRuleContext(); ctx.exitRule(listener); listener.exitEveryRule(ctx); } }
⏎ org/antlr/v4/runtime/tree/ParseTreeWalker.java
Or download all of them as a single archive file:
File name: antlr-runtime-4.10.1-sources.jar File size: 308953 bytes Release date: 2022-04-15 Download
⇐ What Is ANTLR Parser Generator
2018-10-21, 30994👍, 0💬
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