JavaScript.src.antlr4.Utils.js Maven / Gradle / Ivy

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A collection of tests for ANTLR 4 Runtime libraries.

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function arrayToString(a) {
	return "[" + a.join(", ") + "]";
}

String.prototype.hashCode = function(s) {
	var hash = 0;
	if (this.length === 0) {
		return hash;
	}
	for (var i = 0; i < this.length; i++) {
		var character = this.charCodeAt(i);
		hash = ((hash << 5) - hash) + character;
		hash = hash & hash; // Convert to 32bit integer
	}
	return hash;
};

function standardEqualsFunction(a,b) {
	return a.equals(b);
}

function standardHashFunction(a) {
	return a.hashString();
}

function Set(hashFunction, equalsFunction) {
	this.data = {};
	this.hashFunction = hashFunction || standardHashFunction;
	this.equalsFunction = equalsFunction || standardEqualsFunction;
	return this;
}

Object.defineProperty(Set.prototype, "length", {
	get : function() {
		return this.values().length;
	}
});

Set.prototype.add = function(value) {
	var hash = this.hashFunction(value);
	var key = "hash_" + hash.hashCode();
	if(key in this.data) {
		var i;
		var values = this.data[key];
		for(i=0;i