/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.semantics;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.Token;
import org.antlr.v4.parse.ActionSplitter;
import org.antlr.v4.tool.Alternative;
import org.antlr.v4.tool.ErrorManager;
import org.antlr.v4.tool.Grammar;
import org.antlr.v4.tool.Rule;
import org.antlr.v4.tool.ast.ActionAST;
import org.antlr.v4.tool.ast.GrammarAST;
import org.antlr.v4.tool.ast.TerminalAST;
import java.util.List;
/** Find token and rule refs plus refs to them in actions;
* side-effect: update Alternatives
*/
public class ActionSniffer extends BlankActionSplitterListener {
public Grammar g;
public Rule r; // null if action outside of rule
public Alternative alt; // null if action outside of alt; could be in rule
public ActionAST node;
public Token actionToken; // token within action
public ErrorManager errMgr;
public ActionSniffer(Grammar g, Rule r, Alternative alt, ActionAST node, Token actionToken) {
this.g = g;
this.r = r;
this.alt = alt;
this.node = node;
this.actionToken = actionToken;
this.errMgr = g.tool.errMgr;
}
public void examineAction() {
//System.out.println("examine "+actionToken);
ANTLRStringStream in = new ANTLRStringStream(actionToken.getText());
in.setLine(actionToken.getLine());
in.setCharPositionInLine(actionToken.getCharPositionInLine());
ActionSplitter splitter = new ActionSplitter(in, this);
// forces eval, triggers listener methods
node.chunks = splitter.getActionTokens();
}
public void processNested(Token actionToken) {
ANTLRStringStream in = new ANTLRStringStream(actionToken.getText());
in.setLine(actionToken.getLine());
in.setCharPositionInLine(actionToken.getCharPositionInLine());
ActionSplitter splitter = new ActionSplitter(in, this);
// forces eval, triggers listener methods
splitter.getActionTokens();
}
@Override
public void attr(String expr, Token x) { trackRef(x); }
@Override
public void qualifiedAttr(String expr, Token x, Token y) { trackRef(x); }
@Override
public void setAttr(String expr, Token x, Token rhs) {
trackRef(x);
processNested(rhs);
}
@Override
public void setNonLocalAttr(String expr, Token x, Token y, Token rhs) {
processNested(rhs);
}
public void trackRef(Token x) {
List<TerminalAST> xRefs = alt.tokenRefs.get(x.getText());
if ( xRefs!=null ) {
alt.tokenRefsInActions.map(x.getText(), node);
}
List<GrammarAST> rRefs = alt.ruleRefs.get(x.getText());
if ( rRefs!=null ) {
alt.ruleRefsInActions.map(x.getText(), node);
}
}
}