80 lines
2.0 KiB
JavaScript
80 lines
2.0 KiB
JavaScript
if (typeof ot === 'undefined') {
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// Export for browsers
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var ot = {};
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}
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ot.WrappedOperation = (function (global) {
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'use strict';
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// A WrappedOperation contains an operation and corresponing metadata.
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function WrappedOperation (operation, meta) {
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this.wrapped = operation;
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this.meta = meta;
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}
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WrappedOperation.prototype.apply = function () {
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return this.wrapped.apply.apply(this.wrapped, arguments);
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};
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WrappedOperation.prototype.invert = function () {
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var meta = this.meta;
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return new WrappedOperation(
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this.wrapped.invert.apply(this.wrapped, arguments),
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meta && typeof meta === 'object' && typeof meta.invert === 'function' ?
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meta.invert.apply(meta, arguments) : meta
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);
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};
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// Copy all properties from source to target.
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function copy (source, target) {
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for (var key in source) {
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if (source.hasOwnProperty(key)) {
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target[key] = source[key];
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}
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}
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}
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function composeMeta (a, b) {
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if (a && typeof a === 'object') {
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if (typeof a.compose === 'function') { return a.compose(b); }
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var meta = {};
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copy(a, meta);
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copy(b, meta);
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return meta;
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}
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return b;
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}
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WrappedOperation.prototype.compose = function (other) {
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return new WrappedOperation(
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this.wrapped.compose(other.wrapped),
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composeMeta(this.meta, other.meta)
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);
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};
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function transformMeta (meta, operation) {
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if (meta && typeof meta === 'object') {
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if (typeof meta.transform === 'function') {
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return meta.transform(operation);
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}
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}
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return meta;
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}
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WrappedOperation.transform = function (a, b) {
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var transform = a.wrapped.constructor.transform;
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var pair = transform(a.wrapped, b.wrapped);
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return [
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new WrappedOperation(pair[0], transformMeta(a.meta, b.wrapped)),
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new WrappedOperation(pair[1], transformMeta(b.meta, a.wrapped))
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];
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};
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return WrappedOperation;
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}(this));
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// Export for CommonJS
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if (typeof module === 'object') {
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module.exports = ot.WrappedOperation;
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} |