@gorpacrate/core-graphics/lib/event-sourcing/event-sourcing.js

A core library for creating shape-based graphic editors

"use strict";
exports.__esModule = true;
function getUndoEvent(history, author) {
    if (history.length === 0) {
        return undefined;
    }
    for (var i = (history.length - 1); i >= 0; i--) {
        var ev = history[i];
        if ((ev.author === author) && (ev.applied === true)) {
            return ev;
        }
    }
    return undefined;
}
exports.getUndoEvent = getUndoEvent;
function getRedoEvent(history, author) {
    if (history.length === 0) {
        return undefined;
    }
    var lastUnappliedAuthorEvent;
    for (var i = (history.length - 1); i >= 0; i--) {
        var ev = history[i];
        if ((ev.author === author) && (ev.applied === false)) {
            lastUnappliedAuthorEvent = ev;
            continue;
        }
        if ((ev.author === author) && (ev.applied === true)) {
            return lastUnappliedAuthorEvent;
        }
    }
    return lastUnappliedAuthorEvent;
}
exports.getRedoEvent = getRedoEvent;
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