59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
/** section: Language
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* class ObjectRange
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**/
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/** section: Language
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* $R(start, end[, exclusive = false]) -> ObjectRange
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*
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* Creates a new ObjectRange object.
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* This method is a convenience wrapper around the [[ObjectRange]] constructor,
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* but $R is the preferred alias.
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**/
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function $R(start, end, exclusive) {
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return new ObjectRange(start, end, exclusive);
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}
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var ObjectRange = Class.create(Enumerable, (function() {
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/**
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* new ObjectRange(start, end[, exclusive = false])
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*
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* Creates a new `ObjectRange`.
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*
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* The `exclusive` argument specifies whether `end` itself is a part of the
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* range.
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**/
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function initialize(start, end, exclusive) {
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this.start = start;
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this.end = end;
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this.exclusive = exclusive;
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}
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function _each(iterator) {
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var value = this.start;
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while (this.include(value)) {
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iterator(value);
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value = value.succ();
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}
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}
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/**
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* ObjectRange#include(value) -> Boolean
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*
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* Determines whether the value is included in the range.
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**/
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function include(value) {
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if (value < this.start)
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return false;
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if (this.exclusive)
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return value < this.end;
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return value <= this.end;
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}
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return {
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initialize: initialize,
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_each: _each,
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include: include
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};
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})());
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