fix javascript semantic predicates

runtime/JavaScript/src/antlr4/Utils.js

@@ -4,7 +4,7 @@
  */
 
 function arrayToString(a) {
-    return "[" + a.join(", ") + "]";
+    return Array.isArray(a) ? ("[" + a.join(", ") + "]") : "null";
 }
 
 String.prototype.seed = String.prototype.seed || Math.round(Math.random() * Math.pow(2, 32));

runtime/JavaScript/src/antlr4/atn/ParserATNSimulator.js

@@ -712,7 +712,7 @@ class ParserATNSimulator extends ATNSimulator {
         // First figure out where we can reach on input t
         for (let i=0; i<closure.items.length;i++) {
             const c = closure.items[i];
-            if(this.debug_add) {
+            if(this.debug) {
                 console.log("testing " + this.getTokenName(t) + " at " + c);
             }
             if (c.state instanceof RuleStopState) {

runtime/JavaScript/src/antlr4/atn/SemanticContext.js

@@ -3,7 +3,7 @@
  * can be found in the LICENSE.txt file in the project root.
  */
 
-const {Set, Hash} = require('./../Utils');
+const { Set, Hash, equalArrays } = require('./../Utils');
 
 /**
  * A tree structure used to record the semantic context in which
@@ -14,6 +14,7 @@ const {Set, Hash} = require('./../Utils');
  * {@link SemanticContext} within the scope of this outer class.</p>
  */
 class SemanticContext {
+
 	hashCode() {
 		const hash = new Hash();
 		this.updateHashCode(hash);
@@ -93,6 +94,7 @@ class SemanticContext {
 
 
 class Predicate extends SemanticContext {
+
 	constructor(ruleIndex, predIndex, isCtxDependent) {
 		super();
 		this.ruleIndex = ruleIndex === undefined ? -1 : ruleIndex;
@@ -134,6 +136,7 @@ SemanticContext.NONE = new Predicate();
 
 
 class PrecedencePredicate extends SemanticContext {
+
 	constructor(precedence) {
 		super();
 		this.precedence = precedence === undefined ? 0 : precedence;
@@ -156,7 +159,7 @@ class PrecedencePredicate extends SemanticContext {
 	}
 
 	updateHashCode(hash) {
-		hash.update(31);
+		hash.update(this.precedence);
 	}
 
 	equals(other) {
@@ -170,7 +173,7 @@ class PrecedencePredicate extends SemanticContext {
 	}
 
 	toString() {
-		return "{"+this.precedence+">=prec}?";
+		return "{" + this.precedence + ">=prec}?";
 	}
 
 	static filterPrecedencePredicates(set) {
@@ -217,7 +220,7 @@ class AND extends SemanticContext {
 			});
 			operands.add(reduced);
 		}
-		this.opnds = operands.values();
+		this.opnds = Array.from(operands.values());
 	}
 
 	equals(other) {
@@ -226,7 +229,7 @@ class AND extends SemanticContext {
 		} else if (!(other instanceof AND)) {
 			return false;
 		} else {
-			return this.opnds === other.opnds;
+			return equalArrays(this.opnds, other.opnds);
 		}
 	}
 
@@ -280,11 +283,8 @@ class AND extends SemanticContext {
 	}
 
 	toString() {
-		let s = "";
-		this.opnds.map(function(o) {
-			s += "&& " + o.toString();
-		});
-		return s.length > 3 ? s.slice(3) : s;
+		const s = this.opnds.map(o => o.toString());
+		return (s.length > 3 ? s.slice(3) : s).join("&&");
 	}
 }
 
@@ -321,7 +321,7 @@ class OR extends SemanticContext {
 			const reduced = s[s.length-1];
 			operands.add(reduced);
 		}
-		this.opnds = operands.values();
+		this.opnds = Array.from(operands.values());
 	}
 
 	equals(other) {
@@ -330,7 +330,7 @@ class OR extends SemanticContext {
 		} else if (!(other instanceof OR)) {
 			return false;
 		} else {
-			return this.opnds === other.opnds;
+			return equalArrays(this.opnds, other.opnds);
 		}
 	}
 
@@ -382,11 +382,8 @@ class OR extends SemanticContext {
 	}
 
 	toString() {
-		let s = "";
-		this.opnds.map(function(o) {
-			s += "|| " + o.toString();
-		});
-		return s.length > 3 ? s.slice(3) : s;
+		const s = this.opnds.map(o => o.toString());
+		return (s.length > 3 ? s.slice(3) : s).join("||");
 	}
 }