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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/semantics/UseDefAnalyzer.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.semantics; import org.antlr.runtime.ANTLRStringStream; import org.antlr.runtime.Token; import org.antlr.v4.parse.ANTLRParser; import org.antlr.v4.parse.ActionSplitter; import org.antlr.v4.parse.ActionSplitterListener; import org.antlr.v4.tool.Alternative; import org.antlr.v4.tool.Grammar; import org.antlr.v4.tool.LexerGrammar; import org.antlr.v4.tool.Rule; import org.antlr.v4.tool.ast.ActionAST; import org.antlr.v4.tool.ast.GrammarAST; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; /** Look for errors and deadcode stuff */ public class UseDefAnalyzer { // side-effect: updates Alternative with refs in actions public static void trackTokenRuleRefsInActions(Grammar g) { for (Rule r : g.rules.values()) { for (int i=1; i<=r.numberOfAlts; i++) { Alternative alt = r.alt[i]; for (ActionAST a : alt.actions) { ActionSniffer sniffer = new ActionSniffer(g, r, alt, a, a.token); sniffer.examineAction(); } } } } public static boolean actionIsContextDependent(ActionAST actionAST) { ANTLRStringStream in = new ANTLRStringStream(actionAST.token.getText()); in.setLine(actionAST.token.getLine()); in.setCharPositionInLine(actionAST.token.getCharPositionInLine()); final boolean[] dependent = new boolean[] {false}; // can't be simple bool with anon class ActionSplitterListener listener = new BlankActionSplitterListener() { @Override public void nonLocalAttr(String expr, Token x, Token y) { dependent[0] = true; } @Override public void qualifiedAttr(String expr, Token x, Token y) { dependent[0] = true; } @Override public void setAttr(String expr, Token x, Token rhs) { dependent[0] = true; } @Override public void setExprAttribute(String expr) { dependent[0] = true; } @Override public void setNonLocalAttr(String expr, Token x, Token y, Token rhs) { dependent[0] = true; } @Override public void attr(String expr, Token x) { dependent[0] = true; } }; ActionSplitter splitter = new ActionSplitter(in, listener); // forces eval, triggers listener methods splitter.getActionTokens(); return dependent[0]; } /** Find all rules reachable from r directly or indirectly for all r in g */ public static Map<Rule, Set<Rule>> getRuleDependencies(Grammar g) { return getRuleDependencies(g, g.rules.values()); } public static Map<Rule, Set<Rule>> getRuleDependencies(LexerGrammar g, String modeName) { return getRuleDependencies(g, g.modes.get(modeName)); } public static Map<Rule, Set<Rule>> getRuleDependencies(Grammar g, Collection<Rule> rules) { Map<Rule, Set<Rule>> dependencies = new HashMap<Rule, Set<Rule>>(); for (Rule r : rules) { List<GrammarAST> tokenRefs = r.ast.getNodesWithType(ANTLRParser.TOKEN_REF); for (GrammarAST tref : tokenRefs) { Set<Rule> calls = dependencies.get(r); if ( calls==null ) { calls = new HashSet<Rule>(); dependencies.put(r, calls); } calls.add(g.getRule(tref.getText())); } } return dependencies; } }
⏎ org/antlr/v4/semantics/UseDefAnalyzer.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, 27317👍, 0💬
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