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42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
var types = require("../lib/types");
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var Type = types.Type;
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var builtin = types.builtInTypes;
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var isNumber = builtin.number;
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// An example of constructing a new type with arbitrary constraints from
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// an existing type.
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exports.geq = function(than) {
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return new Type(function(value) {
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return isNumber.check(value) && value >= than;
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}, isNumber + " >= " + than);
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};
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// Default value-returning functions that may optionally be passed as a
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// third argument to Def.prototype.field.
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exports.defaults = {
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// Functions were used because (among other reasons) that's the most
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// elegant way to allow for the emptyArray one always to give a new
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// array instance.
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"null": function() { return null },
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"emptyArray": function() { return [] },
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"false": function() { return false },
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"true": function() { return true },
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"undefined": function() {}
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};
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var naiveIsPrimitive = Type.or(
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builtin.string,
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builtin.number,
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builtin.boolean,
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builtin.null,
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builtin.undefined
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);
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exports.isPrimitive = new Type(function(value) {
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if (value === null)
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return true;
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var type = typeof value;
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return !(type === "object" ||
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type === "function");
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}, naiveIsPrimitive.toString());
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