diffusion/src/node_modules/data/binary/binary-delta-impl.js

Diffusion JavaScript client

var _implements = require('util/interface')._implements;
var Tokeniser = require('cbor/tokeniser');

var BinaryDelta = require('../../../data/binary/binary-delta');

var util = require('data/util');

module.exports = _implements(BinaryDelta, function BinaryDeltaImpl(buffer, offset, length) {
    util.assignInternals(this, buffer, offset, length);

    this.visit = function(visitor) {
        if (this.hasChanges()) {
            var tokeniser = new Tokeniser(buffer, offset, length);

            while (tokeniser.hasRemaining()) {
                var token = tokeniser.nextToken();
                var isEnd = false;

                if (Buffer.isBuffer(token.value)) {
                    isEnd = !visitor.insert(token.value);
                } else {
                    var start = token.value;
                    var end = tokeniser.nextToken().value;

                    isEnd = !visitor.match(start, end);
                }

                if (isEnd) {
                    visitor.end();
                    return;
                }
            }

            visitor.end();
        } else {
            visitor.noChange();
        }
    };

    this.hasChanges = function() {
        return length !== 1;
    };

    this.equals = function(other) {
        if (other) {
            return this.$offset === other.$offset &&
                   this.$length === other.$length &&
                   this.$buffer.equals(other.$buffer);
        }

        return false;
    };
});