refactor DFASerializer and LexerDFASerializer to ES6 classes
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@ -6,73 +6,74 @@
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// A DFA walker that knows how to dump them to serialized strings.#/
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function DFASerializer(dfa, literalNames, symbolicNames) {
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this.dfa = dfa;
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this.literalNames = literalNames || [];
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this.symbolicNames = symbolicNames || [];
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return this;
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}
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class DFASerializer {
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constructor(dfa, literalNames, symbolicNames) {
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this.dfa = dfa;
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this.literalNames = literalNames || [];
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this.symbolicNames = symbolicNames || [];
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}
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DFASerializer.prototype.toString = function() {
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if(this.dfa.s0 === null) {
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return null;
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}
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var buf = "";
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var states = this.dfa.sortedStates();
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for(var i=0;i<states.length;i++) {
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var s = states[i];
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if(s.edges!==null) {
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var n = s.edges.length;
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for(var j=0;j<n;j++) {
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var t = s.edges[j] || null;
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if(t!==null && t.stateNumber !== 0x7FFFFFFF) {
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buf = buf.concat(this.getStateString(s));
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buf = buf.concat("-");
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buf = buf.concat(this.getEdgeLabel(j));
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buf = buf.concat("->");
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buf = buf.concat(this.getStateString(t));
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buf = buf.concat('\n');
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}
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}
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toString() {
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if(this.dfa.s0 === null) {
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return null;
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}
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}
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return buf.length===0 ? null : buf;
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};
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DFASerializer.prototype.getEdgeLabel = function(i) {
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if (i===0) {
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return "EOF";
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} else if(this.literalNames !==null || this.symbolicNames!==null) {
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return this.literalNames[i-1] || this.symbolicNames[i-1];
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} else {
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return String.fromCharCode(i-1);
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var buf = "";
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var states = this.dfa.sortedStates();
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for(var i=0;i<states.length;i++) {
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var s = states[i];
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if(s.edges!==null) {
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var n = s.edges.length;
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for(var j=0;j<n;j++) {
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var t = s.edges[j] || null;
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if(t!==null && t.stateNumber !== 0x7FFFFFFF) {
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buf = buf.concat(this.getStateString(s));
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buf = buf.concat("-");
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buf = buf.concat(this.getEdgeLabel(j));
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buf = buf.concat("->");
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buf = buf.concat(this.getStateString(t));
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buf = buf.concat('\n');
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}
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}
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}
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}
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return buf.length===0 ? null : buf;
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}
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};
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DFASerializer.prototype.getStateString = function(s) {
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var baseStateStr = ( s.isAcceptState ? ":" : "") + "s" + s.stateNumber + ( s.requiresFullContext ? "^" : "");
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if(s.isAcceptState) {
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if (s.predicates !== null) {
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return baseStateStr + "=>" + s.predicates.toString();
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getEdgeLabel(i) {
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if (i===0) {
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return "EOF";
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} else if(this.literalNames !==null || this.symbolicNames!==null) {
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return this.literalNames[i-1] || this.symbolicNames[i-1];
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} else {
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return baseStateStr + "=>" + s.prediction.toString();
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return String.fromCharCode(i-1);
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}
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} else {
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return baseStateStr;
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}
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};
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function LexerDFASerializer(dfa) {
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DFASerializer.call(this, dfa, null);
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return this;
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getStateString(s) {
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var baseStateStr = ( s.isAcceptState ? ":" : "") + "s" + s.stateNumber + ( s.requiresFullContext ? "^" : "");
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if(s.isAcceptState) {
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if (s.predicates !== null) {
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return baseStateStr + "=>" + s.predicates.toString();
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} else {
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return baseStateStr + "=>" + s.prediction.toString();
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}
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} else {
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return baseStateStr;
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}
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}
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}
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LexerDFASerializer.prototype = Object.create(DFASerializer.prototype);
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LexerDFASerializer.prototype.constructor = LexerDFASerializer;
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class LexerDFASerializer extends DFASerializer {
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constructor(dfa) {
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super(dfa, null);
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return this;
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}
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getEdgeLabel(i) {
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return "'" + String.fromCharCode(i) + "'";
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}
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}
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LexerDFASerializer.prototype.getEdgeLabel = function(i) {
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return "'" + String.fromCharCode(i) + "'";
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};
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exports.DFASerializer = DFASerializer;
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exports.LexerDFASerializer = LexerDFASerializer;
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