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