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/**
@constructor
@example
var _index = new Hash();
_index.set("a", "apple");
_index.set("b", "blue");
_index.set("c", "coffee");
for (var p = _index.first(); p; p = _index.next()) {
print(p.key+" is for "+p.value);
}
*/
var Hash = function() {
this._map = {};
this._keys = [];
this._vals = [];
this.reset();
}
Hash.prototype.set = function(k, v) {
if (k != "") {
this._keys.push(k);
this._map["="+k] = this._vals.length;
this._vals.push(v);
}
}
Hash.prototype.replace = function(k, k2, v) {
if (k == k2) return;
var offset = this._map["="+k];
this._keys[offset] = k2;
if (typeof v != "undefined") this._vals[offset] = v;
this._map["="+k2] = offset;
delete(this._map["="+k]);
}
Hash.prototype.drop = function(k) {
if (k != "") {
var offset = this._map["="+k];
this._keys.splice(offset, 1);
this._vals.splice(offset, 1);
delete(this._map["="+k]);
for (var p in this._map) {
if (this._map[p] >= offset) this._map[p]--;
}
if (this._cursor >= offset && this._cursor > 0) this._cursor--;
}
}
Hash.prototype.get = function(k) {
if (k != "") {
return this._vals[this._map["="+k]];
}
}
Hash.prototype.keys = function() {
return this._keys;
}
Hash.prototype.hasKey = function(k) {
if (k != "") {
return (typeof this._map["="+k] != "undefined");
}
}
Hash.prototype.values = function() {
return this._vals;
}
Hash.prototype.reset = function() {
this._cursor = 0;
}
Hash.prototype.first = function() {
this.reset();
return this.next();
}
Hash.prototype.next = function() {
if (this._cursor++ < this._keys.length)
return {key: this._keys[this._cursor-1], value: this._vals[this._cursor-1]};
}
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