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