48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
// Basic library functions. This will include a few simple functions,
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// but be augmented with several namespaces for the other libraries in
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// the base library.
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if (! this['plt']) { this['plt'] = {}; }
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(function (plt) {
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var baselib = {};
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plt['baselib'] = baselib;
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// Simple object inheritance.
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var heir = function(parentPrototype) {
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var f = function() {}
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f.prototype = parentPrototype;
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return new f();
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};
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// clone: object -> object
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// Copies an object. The new object should respond like the old
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// object, including to things like instanceof.
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var clone = function(obj) {
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var C = function() {}
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C.prototype = obj;
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var c = new C();
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for (property in obj) {
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if (obj.hasOwnProperty(property)) {
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c[property] = obj[property];
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}
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}
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return c;
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};
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// Consumes a class and creates a predicate that recognizes subclasses.
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var makeClassPredicate = function(aClass) {
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return function(x) { return x instanceof aClass; };
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};
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baselib.heir = heir;
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baselib.clone = clone;
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baselib.makeClassPredicate = makeClassPredicate;
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})(this['plt']);
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