77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
/*jslint vars: true, plusplus: true, maxerr: 50, indent: 4 */
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// 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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'use strict';
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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 property;
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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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// Helper to deal with the argument-passing of primitives. Call f
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// with arguments bound from MACHINE.e, assuming
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// MACHINE.a has been initialized with the number of
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// arguments on the stack. vs provides optional values for the
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// arguments that go beyond those of the mandatoryArgCount.
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var withArguments = function (MACHINE, mandatoryArgCount, vs, f) {
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var args = [], i;
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for (i = 0; i < MACHINE.a; i++) {
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if (i < mandatoryArgCount) {
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args.push(MACHINE.e[MACHINE.e.length - 1 - i]);
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} else {
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if (i < MACHINE.a) {
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args.push(MACHINE.e[MACHINE.e.length - 1 - i]);
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} else {
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args.push(vs[mandatoryArgCount - i]);
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}
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}
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}
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return f.apply(null, args);
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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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baselib.withArguments = withArguments;
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}(this.plt));
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