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refactor DFASerializer and LexerDFASerializer to ES6 classes

This commit is contained in:
Camilo Roca 2020-02-10 21:54:23 +01:00
parent e5910c3019
commit 772286cf00
1 changed files with 57 additions and 56 deletions
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113
runtime/JavaScript/src/antlr4/dfa/DFASerializer.js
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@ -6,73 +6,74 @@
// A DFA walker that knows how to dump them to serialized strings.#/ // A DFA walker that knows how to dump them to serialized strings.#/
function DFASerializer(dfa, literalNames, symbolicNames) { class DFASerializer {
this.dfa = dfa; constructor(dfa, literalNames, symbolicNames) {
this.literalNames = literalNames || []; this.dfa = dfa;
this.symbolicNames = symbolicNames || []; this.literalNames = literalNames || [];
return this; this.symbolicNames = symbolicNames || [];
} }
DFASerializer.prototype.toString = function() { toString() {
if(this.dfa.s0 === null) { if(this.dfa.s0 === null) {
return null; return null;
}
var buf = "";
var states = this.dfa.sortedStates();
for(var i=0;i<states.length;i++) {
var s = states[i];
if(s.edges!==null) {
var n = s.edges.length;
for(var j=0;j<n;j++) {
var t = s.edges[j] || null;
if(t!==null && t.stateNumber !== 0x7FFFFFFF) {
buf = buf.concat(this.getStateString(s));
buf = buf.concat("-");
buf = buf.concat(this.getEdgeLabel(j));
buf = buf.concat("->");
buf = buf.concat(this.getStateString(t));
buf = buf.concat('\n');
}
}
} }
} var buf = "";
return buf.length===0 ? null : buf; var states = this.dfa.sortedStates();
}; for(var i=0;i<states.length;i++) {
var s = states[i];
DFASerializer.prototype.getEdgeLabel = function(i) { if(s.edges!==null) {
if (i===0) { var n = s.edges.length;
return "EOF"; for(var j=0;j<n;j++) {
} else if(this.literalNames !==null || this.symbolicNames!==null) { var t = s.edges[j] || null;
return this.literalNames[i-1] || this.symbolicNames[i-1]; if(t!==null && t.stateNumber !== 0x7FFFFFFF) {
} else { buf = buf.concat(this.getStateString(s));
return String.fromCharCode(i-1); buf = buf.concat("-");
buf = buf.concat(this.getEdgeLabel(j));
buf = buf.concat("->");
buf = buf.concat(this.getStateString(t));
buf = buf.concat('\n');
}
}
}
}
return buf.length===0 ? null : buf;
} }
};
DFASerializer.prototype.getStateString = function(s) { getEdgeLabel(i) {
var baseStateStr = ( s.isAcceptState ? ":" : "") + "s" + s.stateNumber + ( s.requiresFullContext ? "^" : ""); if (i===0) {
if(s.isAcceptState) { return "EOF";
if (s.predicates !== null) { } else if(this.literalNames !==null || this.symbolicNames!==null) {
return baseStateStr + "=>" + s.predicates.toString(); return this.literalNames[i-1] || this.symbolicNames[i-1];
} else { } else {
return baseStateStr + "=>" + s.prediction.toString(); return String.fromCharCode(i-1);
} }
} else {
return baseStateStr;
} }
};
function LexerDFASerializer(dfa) { getStateString(s) {
DFASerializer.call(this, dfa, null); var baseStateStr = ( s.isAcceptState ? ":" : "") + "s" + s.stateNumber + ( s.requiresFullContext ? "^" : "");
return this; if(s.isAcceptState) {
if (s.predicates !== null) {
return baseStateStr + "=>" + s.predicates.toString();
} else {
return baseStateStr + "=>" + s.prediction.toString();
}
} else {
return baseStateStr;
}
}
} }
LexerDFASerializer.prototype = Object.create(DFASerializer.prototype); class LexerDFASerializer extends DFASerializer {
LexerDFASerializer.prototype.constructor = LexerDFASerializer; constructor(dfa) {
super(dfa, null);
return this;
}
getEdgeLabel(i) {
return "'" + String.fromCharCode(i) + "'";
}
}
LexerDFASerializer.prototype.getEdgeLabel = function(i) {
return "'" + String.fromCharCode(i) + "'";
};
exports.DFASerializer = DFASerializer; exports.DFASerializer = DFASerializer;
exports.LexerDFASerializer = LexerDFASerializer; exports.LexerDFASerializer = LexerDFASerializer;