123 lines
3.8 KiB
JavaScript
123 lines
3.8 KiB
JavaScript
var assert = require('./assert');
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var isTypeName = require('./isTypeName');
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var String = require('./String');
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var Function = require('./Function');
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var isBoolean = require('./isBoolean');
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var isObject = require('./isObject');
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var isNil = require('./isNil');
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var create = require('./create');
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var getTypeName = require('./getTypeName');
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var dict = require('./dict');
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var getDefaultInterfaceName = require('./getDefaultInterfaceName');
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var extend = require('./extend');
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function getDefaultName(props) {
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return 'Struct' + getDefaultInterfaceName(props);
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}
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function extendStruct(mixins, name) {
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return extend(struct, mixins, name);
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}
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function getOptions(options) {
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if (!isObject(options)) {
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options = isNil(options) ? {} : { name: options };
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}
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if (!options.hasOwnProperty('strict')) {
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options.strict = struct.strict;
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}
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if (!options.hasOwnProperty('defaultProps')) {
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options.defaultProps = {};
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}
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return options;
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}
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function struct(props, options) {
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options = getOptions(options);
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var name = options.name;
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var strict = options.strict;
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var defaultProps = options.defaultProps;
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if (process.env.NODE_ENV !== 'production') {
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assert(dict(String, Function).is(props), function () { return 'Invalid argument props ' + assert.stringify(props) + ' supplied to struct(props, [options]) combinator (expected a dictionary String -> Type)'; });
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assert(isTypeName(name), function () { return 'Invalid argument name ' + assert.stringify(name) + ' supplied to struct(props, [options]) combinator (expected a string)'; });
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assert(isBoolean(strict), function () { return 'Invalid argument strict ' + assert.stringify(strict) + ' supplied to struct(props, [options]) combinator (expected a boolean)'; });
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assert(isObject(defaultProps), function () { return 'Invalid argument defaultProps ' + assert.stringify(defaultProps) + ' supplied to struct(props, [options]) combinator (expected an object)'; });
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}
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var displayName = name || getDefaultName(props);
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function Struct(value, path) {
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if (Struct.is(value)) { // implements idempotency
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return value;
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}
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if (process.env.NODE_ENV !== 'production') {
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path = path || [displayName];
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assert(isObject(value), function () { return 'Invalid value ' + assert.stringify(value) + ' supplied to ' + path.join('/') + ' (expected an object)'; });
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// strictness
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if (strict) {
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for (k in value) {
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if (value.hasOwnProperty(k)) {
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assert(props.hasOwnProperty(k), function () { return 'Invalid additional prop "' + k + '" supplied to ' + path.join('/'); });
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}
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}
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}
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}
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if (!(this instanceof Struct)) { // `new` is optional
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return new Struct(value, path);
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}
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for (var k in props) {
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if (props.hasOwnProperty(k)) {
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var expected = props[k];
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var actual = value[k];
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// apply defaults
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if (actual === undefined) {
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actual = defaultProps[k];
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}
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this[k] = create(expected, actual, ( process.env.NODE_ENV !== 'production' ? path.concat(k + ': ' + getTypeName(expected)) : null ));
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}
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}
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if (process.env.NODE_ENV !== 'production') {
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Object.freeze(this);
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}
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}
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Struct.meta = {
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kind: 'struct',
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props: props,
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name: name,
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identity: false,
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strict: strict,
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defaultProps: defaultProps
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};
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Struct.displayName = displayName;
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Struct.is = function (x) {
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return x instanceof Struct;
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};
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Struct.update = function (instance, patch) {
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return new Struct(assert.update(instance, patch));
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};
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Struct.extend = function (xs, name) {
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return extendStruct([Struct].concat(xs), name);
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};
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return Struct;
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}
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struct.strict = false;
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struct.getOptions = getOptions;
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struct.getDefaultName = getDefaultName;
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struct.extend = extendStruct;
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module.exports = struct;
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