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'use strict';
// Built-in types
var types = [
'object',
'number',
'string',
'symbol',
'boolean',
'date',
'function', // Weird to expose this
];
function normalize(coercer, value) {
var coercers = coercer;
if (!Array.isArray(coercers)) {
coercers = [coercer];
}
var ctx = this;
var args = slice(arguments, 2);
// Try in order until one returns a non-undefined value
var result;
coercers.some(function (coercer) {
var val = value;
if (typeof value === 'function' && coercer !== 'function') {
val = value.apply(ctx, args);
}
result = coerce(ctx, coercer, val);
return result !== undefined;
});
return result;
}
function coerce(ctx, coercer, value) {
// Handle built-in types
if (typeof coercer === 'string') {
if (coerce[coercer]) {
return coerce[coercer].call(ctx, value);
}
return typeOf(coercer, value);
}
// Handle custom coercer
if (typeof coercer === 'function') {
return coercer.call(ctx, value);
}
throw new Error('Invalid coercer. Can only be a string or function.');
}
coerce.string = function (value) {
if (
value != null &&
typeof value === 'object' &&
typeof value.toString === 'function'
) {
value = value.toString();
}
return typeOf('string', primitive(value));
};
coerce.number = function (value) {
return typeOf('number', primitive(value));
};
coerce.boolean = function (value) {
return typeOf('boolean', primitive(value));
};
coerce.date = function (value) {
value = primitive(value);
if (typeof value === 'number' && !isNaN(value) && isFinite(value)) {
return new Date(value);
}
};
function typeOf(type, value) {
if (typeof value === type) {
return value;
}
}
function primitive(value) {
if (
value != null &&
typeof value === 'object' &&
typeof value.valueOf === 'function'
) {
value = value.valueOf();
}
return value;
}
function slice(value, from) {
return Array.prototype.slice.call(value, from);
}
// Add methods for each type
types.forEach(function (type) {
// Make it an array for easier concat
var typeArg = [type];
normalize[type] = function () {
var args = slice(arguments);
return normalize.apply(this, typeArg.concat(args));
};
});
module.exports = normalize;
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