82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
var assert = require('./assert');
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var isTypeName = require('./isTypeName');
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var isFunction = require('./isFunction');
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var getTypeName = require('./getTypeName');
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var isIdentity = require('./isIdentity');
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var create = require('./create');
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var is = require('./is');
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var isArray = require('./isArray');
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function getDefaultName(type) {
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return 'Array<' + getTypeName(type) + '>';
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}
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function list(type, name) {
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if (process.env.NODE_ENV !== 'production') {
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assert(isFunction(type), function () { return 'Invalid argument type ' + assert.stringify(type) + ' supplied to list(type, [name]) combinator (expected a type)'; });
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assert(isTypeName(name), function () { return 'Invalid argument name ' + assert.stringify(name) + ' supplied to list(type, [name]) combinator (expected a string)'; });
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}
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var displayName = name || getDefaultName(type);
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var typeNameCache = getTypeName(type);
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var identity = isIdentity(type); // the list is identity iif type is identity
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function List(value, path) {
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if (process.env.NODE_ENV === 'production') {
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if (identity) {
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return value; // just trust the input if elements must not be hydrated
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}
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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(isArray(value), function () { return 'Invalid value ' + assert.stringify(value) + ' supplied to ' + path.join('/') + ' (expected an array of ' + typeNameCache + ')'; });
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}
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var idempotent = true; // will remain true if I can reutilise the input
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var ret = []; // make a temporary copy, will be discarded if idempotent remains true
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for (var i = 0, len = value.length; i < len; i++ ) {
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var actual = value[i];
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var instance = create(type, actual, ( process.env.NODE_ENV !== 'production' ? path.concat(i + ': ' + typeNameCache) : null ));
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idempotent = idempotent && ( actual === instance );
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ret.push(instance);
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}
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if (idempotent) { // implements idempotency
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ret = value;
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}
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if (process.env.NODE_ENV !== 'production') {
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Object.freeze(ret);
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}
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return ret;
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}
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List.meta = {
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kind: 'list',
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type: type,
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name: name,
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identity: identity
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};
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List.displayName = displayName;
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List.is = function (x) {
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return isArray(x) && x.every(function (e) {
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return is(e, type);
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});
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};
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List.update = function (instance, patch) {
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return List(assert.update(instance, patch));
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};
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return List;
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}
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list.getDefaultName = getDefaultName;
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module.exports = list;
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