68 lines
2.2 KiB
JavaScript
68 lines
2.2 KiB
JavaScript
define([
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'/common/realtime-input.js'
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], function () {
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var ChainPad = window.ChainPad;
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var JsonOT = {};
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var validate = JsonOT.validate = function (text, toTransform, transformBy) {
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var DEBUG = window.REALTIME_DEBUG = window.REALTIME_DEBUG || {};
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var resultOp, text2, text3;
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try {
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// text = O (mutual common ancestor)
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// toTransform = A (the first incoming operation)
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// transformBy = B (the second incoming operation)
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// threeway merge (0, A, B)
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resultOp = ChainPad.Operation.transform0(text, toTransform, transformBy);
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/* if after operational transform we find that no op is necessary
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return null to ignore this patch */
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if (!resultOp) { return null; }
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text2 = ChainPad.Operation.apply(transformBy, text);
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text3 = ChainPad.Operation.apply(resultOp, text2);
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try {
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JSON.parse(text3);
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return resultOp;
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} catch (e) {
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console.error(e);
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var info = DEBUG.ot_parseError = {
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type: 'resultParseError',
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resultOp: resultOp,
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toTransform: toTransform,
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transformBy: transformBy,
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text1: text,
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text2: text2,
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text3: text3,
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error: e
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};
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console.log('Debugging info available at `window.REALTIME_DEBUG.ot_parseError`');
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}
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} catch (x) {
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console.error(x);
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window.DEBUG.ot_applyError = {
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type: 'resultParseError',
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resultOp: resultOp,
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toTransform: toTransform,
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transformBy: transformBy,
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text1: text,
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text2: text2,
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text3: text3,
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error: x
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};
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console.log('Debugging info available at `window.REALTIME_DEBUG.ot_applyError`');
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}
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// returning **null** breaks out of the loop
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// which transforms conflicting operations
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// in theory this should prevent us from producing bad JSON
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return null;
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};
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return JsonOT;
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});
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