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ANTLR Tool Source Code
ANTLR is a powerful parser generator for multiple programming languages including Java.
ANTLR contains 2 major modules:
ANTLR Tool 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/automata/TailEpsilonRemover.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.automata; import org.antlr.v4.runtime.atn.ATN; import org.antlr.v4.runtime.atn.ATNState; import org.antlr.v4.runtime.atn.BlockEndState; import org.antlr.v4.runtime.atn.EpsilonTransition; import org.antlr.v4.runtime.atn.PlusLoopbackState; import org.antlr.v4.runtime.atn.RuleTransition; import org.antlr.v4.runtime.atn.StarLoopbackState; import org.antlr.v4.runtime.atn.Transition; /** * * @author Terence Parr */ public class TailEpsilonRemover extends ATNVisitor { private final ATN _atn; public TailEpsilonRemover(ATN atn) { this._atn = atn; } @Override public void visitState(ATNState p) { if (p.getStateType() == ATNState.BASIC && p.getNumberOfTransitions() == 1) { ATNState q = p.transition(0).target; if (p.transition(0) instanceof RuleTransition) { q = ((RuleTransition) p.transition(0)).followState; } if (q.getStateType() == ATNState.BASIC) { // we have p-x->q for x in {rule, action, pred, token, ...} // if edge out of q is single epsilon to block end // we can strip epsilon p-x->q-eps->r Transition trans = q.transition(0); if (q.getNumberOfTransitions() == 1 && trans instanceof EpsilonTransition) { ATNState r = trans.target; if (r instanceof BlockEndState || r instanceof PlusLoopbackState || r instanceof StarLoopbackState) { // skip over q if (p.transition(0) instanceof RuleTransition) { ((RuleTransition) p.transition(0)).followState = r; } else { p.transition(0).target = r; } _atn.removeState(q); } } } } } }
⏎ org/antlr/v4/automata/TailEpsilonRemover.java
Or download all of them as a single archive file:
File name: antlr-tool-4.10.1-sources.jar File size: 347718 bytes Release date: 2022-04-15 Download
2022-04-24, 26801👍, 0💬
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