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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/IterativeParseTreeWalker.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.misc.IntegerStack; import java.util.ArrayDeque; import java.util.Deque; /** * An iterative (read: non-recursive) pre-order and post-order tree walker that * doesn't use the thread stack but heap-based stacks. Makes it possible to * process deeply nested parse trees. */ public class IterativeParseTreeWalker extends ParseTreeWalker { @Override public void walk(ParseTreeListener listener, ParseTree t) { final Deque<ParseTree> nodeStack = new ArrayDeque<ParseTree>(); final IntegerStack indexStack = new IntegerStack(); ParseTree currentNode = t; int currentIndex = 0; while (currentNode != null) { // pre-order visit if (currentNode instanceof ErrorNode) { listener.visitErrorNode((ErrorNode) currentNode); } else if (currentNode instanceof TerminalNode) { listener.visitTerminal((TerminalNode) currentNode); } else { final RuleNode r = (RuleNode) currentNode; enterRule(listener, r); } // Move down to first child, if exists if (currentNode.getChildCount() > 0) { nodeStack.push(currentNode); indexStack.push(currentIndex); currentIndex = 0; currentNode = currentNode.getChild(0); continue; } // No child nodes, so walk tree do { // post-order visit if (currentNode instanceof RuleNode) { exitRule(listener, (RuleNode) currentNode); } // No parent, so no siblings if (nodeStack.isEmpty()) { currentNode = null; currentIndex = 0; break; } // Move to next sibling if possible currentNode = nodeStack.peek().getChild(++currentIndex); if (currentNode != null) { break; } // No next, sibling, so move up currentNode = nodeStack.pop(); currentIndex = indexStack.pop(); } while (currentNode != null); } } }
⏎ org/antlr/v4/runtime/tree/IterativeParseTreeWalker.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, 31317👍, 0💬
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