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The ANTLR 4 grammar compiler.
/*
* 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.tool;
import org.antlr.v4.misc.Utils;
import org.antlr.v4.runtime.atn.ATNConfig;
import org.antlr.v4.runtime.atn.ATNState;
import org.antlr.v4.runtime.atn.AbstractPredicateTransition;
import org.antlr.v4.runtime.atn.ActionTransition;
import org.antlr.v4.runtime.atn.AtomTransition;
import org.antlr.v4.runtime.atn.BlockEndState;
import org.antlr.v4.runtime.atn.BlockStartState;
import org.antlr.v4.runtime.atn.DecisionState;
import org.antlr.v4.runtime.atn.NotSetTransition;
import org.antlr.v4.runtime.atn.PlusBlockStartState;
import org.antlr.v4.runtime.atn.PlusLoopbackState;
import org.antlr.v4.runtime.atn.RangeTransition;
import org.antlr.v4.runtime.atn.RuleStartState;
import org.antlr.v4.runtime.atn.RuleStopState;
import org.antlr.v4.runtime.atn.RuleTransition;
import org.antlr.v4.runtime.atn.SetTransition;
import org.antlr.v4.runtime.atn.StarBlockStartState;
import org.antlr.v4.runtime.atn.StarLoopEntryState;
import org.antlr.v4.runtime.atn.StarLoopbackState;
import org.antlr.v4.runtime.atn.Transition;
import org.antlr.v4.runtime.dfa.DFA;
import org.antlr.v4.runtime.dfa.DFAState;
import org.antlr.v4.runtime.misc.IntegerList;
import org.stringtemplate.v4.ST;
import org.stringtemplate.v4.STGroup;
import org.stringtemplate.v4.STGroupFile;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/** The DOT (part of graphviz) generation aspect. */
public class DOTGenerator {
public static final boolean STRIP_NONREDUCED_STATES = false;
protected String arrowhead="normal";
protected String rankdir="LR";
/** Library of output templates; use {@code } format. */
public static STGroup stlib = new STGroupFile("org/antlr/v4/tool/templates/dot/graphs.stg");
protected Grammar grammar;
/** This aspect is associated with a grammar */
public DOTGenerator(Grammar grammar) {
this.grammar = grammar;
}
public String getDOT(DFA dfa, boolean isLexer) {
if ( dfa.s0==null ) return null;
ST dot = stlib.getInstanceOf("dfa");
dot.add("name", "DFA"+dfa.decision);
dot.add("startState", dfa.s0.stateNumber);
// dot.add("useBox", Tool.internalOption_ShowATNConfigsInDFA);
dot.add("rankdir", rankdir);
// define stop states first; seems to be a bug in DOT where doublecircle
for (DFAState d : dfa.states.keySet()) {
if ( !d.isAcceptState ) continue;
ST st = stlib.getInstanceOf("stopstate");
st.add("name", "s"+d.stateNumber);
st.add("label", getStateLabel(d));
dot.add("states", st);
}
for (DFAState d : dfa.states.keySet()) {
if ( d.isAcceptState ) continue;
if ( d.stateNumber == Integer.MAX_VALUE ) continue;
ST st = stlib.getInstanceOf("state");
st.add("name", "s"+d.stateNumber);
st.add("label", getStateLabel(d));
dot.add("states", st);
}
for (DFAState d : dfa.states.keySet()) {
if ( d.edges!=null ) {
for (int i = 0; i < d.edges.length; i++) {
DFAState target = d.edges[i];
if ( target==null) continue;
if ( target.stateNumber == Integer.MAX_VALUE ) continue;
int ttype = i-1; // we shift up for EOF as -1 for parser
String label = String.valueOf(ttype);
if ( isLexer ) label = "'"+getEdgeLabel(new StringBuilder().appendCodePoint(i).toString())+"'";
else if ( grammar!=null ) label = grammar.getTokenDisplayName(ttype);
ST st = stlib.getInstanceOf("edge");
st.add("label", label);
st.add("src", "s"+d.stateNumber);
st.add("target", "s"+target.stateNumber);
st.add("arrowhead", arrowhead);
dot.add("edges", st);
}
}
}
String output = dot.render();
return Utils.sortLinesInString(output);
}
protected String getStateLabel(DFAState s) {
if ( s==null ) return "null";
StringBuilder buf = new StringBuilder(250);
buf.append('s');
buf.append(s.stateNumber);
if ( s.isAcceptState ) {
buf.append("=>").append(s.prediction);
}
if ( s.requiresFullContext) {
buf.append("^");
}
if ( grammar!=null ) {
Set alts = s.getAltSet();
if ( alts!=null ) {
buf.append("\\n");
// separate alts
IntegerList altList = new IntegerList();
altList.addAll(alts);
altList.sort();
Set configurations = s.configs;
for (int altIndex = 0; altIndex < altList.size(); altIndex++) {
int alt = altList.get(altIndex);
if ( altIndex>0 ) {
buf.append("\\n");
}
buf.append("alt");
buf.append(alt);
buf.append(':');
// get a list of configs for just this alt
// it will help us print better later
List configsInAlt = new ArrayList();
for (ATNConfig c : configurations) {
if (c.alt != alt) continue;
configsInAlt.add(c);
}
int n = 0;
for (int cIndex = 0; cIndex < configsInAlt.size(); cIndex++) {
ATNConfig c = configsInAlt.get(cIndex);
n++;
buf.append(c.toString(null, false));
if ( (cIndex+1)3 ) {
buf.append("\\n");
}
}
}
}
}
String stateLabel = buf.toString();
return stateLabel;
}
public String getDOT(ATNState startState) {
return getDOT(startState, false);
}
public String getDOT(ATNState startState, boolean isLexer) {
Set ruleNames = grammar.rules.keySet();
String[] names = new String[ruleNames.size()+1];
int i = 0;
for (String s : ruleNames) names[i++] = s;
return getDOT(startState, names, isLexer);
}
/** Return a String containing a DOT description that, when displayed,
* will show the incoming state machine visually. All nodes reachable
* from startState will be included.
*/
public String getDOT(ATNState startState, String[] ruleNames, boolean isLexer) {
if ( startState==null ) return null;
// The output DOT graph for visualization
Set markedStates = new HashSet();
ST dot = stlib.getInstanceOf("atn");
dot.add("startState", startState.stateNumber);
dot.add("rankdir", rankdir);
List work = new LinkedList();
work.add(startState);
while ( !work.isEmpty() ) {
ATNState s = work.get(0);
if ( markedStates.contains(s) ) { work.remove(0); continue; }
markedStates.add(s);
// don't go past end of rule node to the follow states
if ( s instanceof RuleStopState) continue;
// special case: if decision point, then line up the alt start states
// unless it's an end of block
// if ( s instanceof BlockStartState ) {
// ST rankST = stlib.getInstanceOf("decision-rank");
// DecisionState alt = (DecisionState)s;
// for (int i=0; i 1) {
edgeST.add("transitionIndex", i);
}
else {
edgeST.add("transitionIndex", false);
}
dot.add("edges", edgeST);
work.add(edge.target);
}
}
// define nodes we visited (they will appear first in DOT output)
// this is an example of ST's lazy eval :)
// define stop state first; seems to be a bug in DOT where doublecircle
// shape only works if we define them first. weird.
// ATNState stopState = startState.atn.ruleToStopState.get(startState.rule);
// if ( stopState!=null ) {
// ST st = stlib.getInstanceOf("stopstate");
// st.add("name", "s"+stopState.stateNumber);
// st.add("label", getStateLabel(stopState));
// dot.add("states", st);
// }
for (ATNState s : markedStates) {
if ( !(s instanceof RuleStopState) ) continue;
ST st = stlib.getInstanceOf("stopstate");
st.add("name", "s"+s.stateNumber);
st.add("label", getStateLabel(s));
dot.add("states", st);
}
for (ATNState s : markedStates) {
if ( s instanceof RuleStopState ) continue;
ST st = stlib.getInstanceOf("state");
st.add("name", "s"+s.stateNumber);
st.add("label", getStateLabel(s));
st.add("transitions", s.getTransitions());
dot.add("states", st);
}
return dot.render();
}
/** Do a depth-first walk of the state machine graph and
* fill a DOT description template. Keep filling the
* states and edges attributes. We know this is an ATN
* for a rule so don't traverse edges to other rules and
* don't go past rule end state.
*/
// protected void walkRuleATNCreatingDOT(ST dot,
// ATNState s)
// {
// if ( markedStates.contains(s) ) {
// return; // already visited this node
// }
//
// markedStates.add(s.stateNumber); // mark this node as completed.
//
// // first add this node
// ST stateST;
// if ( s instanceof RuleStopState ) {
// stateST = stlib.getInstanceOf("stopstate");
// }
// else {
// stateST = stlib.getInstanceOf("state");
// }
// stateST.add("name", getStateLabel(s));
// dot.add("states", stateST);
//
// if ( s instanceof RuleStopState ) {
// return; // don't go past end of rule node to the follow states
// }
//
// // special case: if decision point, then line up the alt start states
// // unless it's an end of block
// if ( s instanceof DecisionState ) {
// GrammarAST n = ((ATNState)s).ast;
// if ( n!=null && s instanceof BlockEndState ) {
// ST rankST = stlib.getInstanceOf("decision-rank");
// ATNState alt = (ATNState)s;
// while ( alt!=null ) {
// rankST.add("states", getStateLabel(alt));
// if ( alt.transition(1) !=null ) {
// alt = (ATNState)alt.transition(1).target;
// }
// else {
// alt=null;
// }
// }
// dot.add("decisionRanks", rankST);
// }
// }
//
// // make a DOT edge for each transition
// ST edgeST = null;
// for (int i = 0; i < s.getNumberOfTransitions(); i++) {
// Transition edge = (Transition) s.transition(i);
// if ( edge instanceof RuleTransition ) {
// RuleTransition rr = ((RuleTransition)edge);
// // don't jump to other rules, but display edge to follow node
// edgeST = stlib.getInstanceOf("edge");
// if ( rr.rule.g != grammar ) {
// edgeST.add("label", "<"+rr.rule.g.name+"."+rr.rule.name+">");
// }
// else {
// edgeST.add("label", "<"+rr.rule.name+">");
// }
// edgeST.add("src", getStateLabel(s));
// edgeST.add("target", getStateLabel(rr.followState));
// edgeST.add("arrowhead", arrowhead);
// dot.add("edges", edgeST);
// walkRuleATNCreatingDOT(dot, rr.followState);
// continue;
// }
// if ( edge instanceof ActionTransition ) {
// edgeST = stlib.getInstanceOf("action-edge");
// }
// else if ( edge instanceof PredicateTransition ) {
// edgeST = stlib.getInstanceOf("edge");
// }
// else if ( edge.isEpsilon() ) {
// edgeST = stlib.getInstanceOf("epsilon-edge");
// }
// else {
// edgeST = stlib.getInstanceOf("edge");
// }
// edgeST.add("label", getEdgeLabel(edge.toString(grammar)));
// edgeST.add("src", getStateLabel(s));
// edgeST.add("target", getStateLabel(edge.target));
// edgeST.add("arrowhead", arrowhead);
// dot.add("edges", edgeST);
// walkRuleATNCreatingDOT(dot, edge.target); // keep walkin'
// }
// }
/** Fix edge strings so they print out in DOT properly;
* generate any gated predicates on edge too.
*/
protected String getEdgeLabel(String label) {
label = label.replace("\\", "\\\\");
label = label.replace("\"", "\\\"");
label = label.replace("\n", "\\\\n");
label = label.replace("\r", "");
return label;
}
protected String getStateLabel(ATNState s) {
if ( s==null ) return "null";
String stateLabel = "";
if (s instanceof BlockStartState) {
stateLabel += "→\\n";
}
else if (s instanceof BlockEndState) {
stateLabel += "←\\n";
}
stateLabel += String.valueOf(s.stateNumber);
if (s instanceof PlusBlockStartState || s instanceof PlusLoopbackState) {
stateLabel += "+";
}
else if (s instanceof StarBlockStartState || s instanceof StarLoopEntryState || s instanceof StarLoopbackState) {
stateLabel += "*";
}
if ( s instanceof DecisionState && ((DecisionState)s).decision>=0 ) {
stateLabel = stateLabel+"\\nd="+((DecisionState)s).decision;
}
return stateLabel;
}
}
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