# Code coverage report for lib/parsers/javascript.js

## Statements: 12.38% (13 / 105) Branches: 2.04% (1 / 49) Functions: 0% (0 / 8) Lines: 12.38% (13 / 105) Ignored: 1 statement, 1 branch

All files » lib/parsers/ » javascript.js

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     'use strict';

    var util   = require('util');

    function JavascriptReplyParser() {
        this.name = exports.name;
        this._buffer            = new Buffer(0);
        this._offset            = 0;
    }

    function IncompleteReadBuffer(message) {
        this.name = 'IncompleteReadBuffer';
        this.message = message;
    }
    util.inherits(IncompleteReadBuffer, Error);

    JavascriptReplyParser.prototype._parseResult = function (type) {
        var start = 0,
            end = 0,
            offset = 0,
            packetHeader = 0;

        if (type === 43 || type === 58 || type === 45) { // + or : or -
            // up to the delimiter
            end = this._packetEndOffset() - 1;
            start = this._offset;

            if (end > this._buffer.length) {
                throw new IncompleteReadBuffer('Wait for more data.');
            }

            // include the delimiter
            this._offset = end + 2;

            if (type === 43) {
                return this._buffer.slice(start, end);
            } else if (type === 58) {
                // return the coerced numeric value
                return +this._buffer.toString('ascii', start, end);
            }
            return new Error(this._buffer.toString('utf-8', start, end));
        } else if (type === 36) { // $
            // set a rewind point, as the packet could be larger than the
            // buffer in memory
            offset = this._offset - 1;

            packetHeader = this.parseHeader();

            // packets with a size of -1 are considered null
            if (packetHeader === -1) {
                return null;
            }

            end = this._offset + packetHeader;
            start = this._offset;

            if (end > this._buffer.length) {
                throw new IncompleteReadBuffer('Wait for more data.');
            }

            // set the offset to after the delimiter
            this._offset = end + 2;

            return this._buffer.slice(start, end);
        } else if (type === 42) { // *
            offset = this._offset;
            packetHeader = this.parseHeader();

            if (packetHeader === -1) {
                return null;
            }

            if (packetHeader > this._bytesRemaining()) {
                this._offset = offset - 1;
                throw new IncompleteReadBuffer('Wait for more data.');
            }

            var reply = [];
            var ntype, i, res;

            offset = this._offset - 1;

            for (i = 0; i < packetHeader; i++) {
                ntype = this._buffer[this._offset++];

                if (this._offset > this._buffer.length) {
                    throw new IncompleteReadBuffer('Wait for more data.');
                }
                res = this._parseResult(ntype);
                reply.push(res);
            }

            return reply;
        }
    };

    JavascriptReplyParser.prototype.execute = function (buffer) {
        this.append(buffer);

        var type, ret, offset;

        while (true) {
            offset = this._offset;
            // at least 4 bytes: :1\r\n
            if (this._bytesRemaining() < 4) {
                break;
            }

            try {
                type = this._buffer[this._offset++];

                if (type === 43) { // Strings +
                    ret = this._parseResult(type);

                    this.send_reply(ret);
                } else  if (type === 45) { // Errors -
                    ret = this._parseResult(type);

                    this.send_error(ret);
                } else if (type === 58) { // Integers :
                    ret = this._parseResult(type);

                    this.send_reply(ret);
                } else if (type === 36) { // Bulk strings $
                    ret = this._parseResult(type);

                    this.send_reply(ret);
                } else if (type === 42) { // Arrays *
                    // set a rewind point. if a failure occurs,
                    // wait for the next execute()/append() and try again
                    offset = this._offset - 1;

                    ret = this._parseResult(type);

                    this.send_reply(ret);
                } else if (type === 10 || type === 13) {
                    break;
                } else {
                    var err = new Error('Protocol error, got "' + String.fromCharCode(type) + '" as reply type byte');
                    this.send_error(err);
                }
            } catch (err) {
                // catch the error (not enough data), rewind, and wait
                // for the next packet to appear
                this._offset = offset;
                break;
            }
        }
    };

    JavascriptReplyParser.prototype.append = function (newBuffer) {

        // out of data
        if (this._offset >= this._buffer.length) {
            this._buffer = newBuffer;
            this._offset = 0;
            return;
        }

        this._buffer = Buffer.concat([this._buffer.slice(this._offset), newBuffer]);
        this._offset = 0;
    };

    JavascriptReplyParser.prototype.parseHeader = function () {
        var end   = this._packetEndOffset(),
            value = this._buffer.toString('ascii', this._offset, end - 1) | 0;

        this._offset = end + 1;

        return value;
    };

    JavascriptReplyParser.prototype._packetEndOffset = function () {
        var offset = this._offset;

        while (this._buffer[offset] !== 0x0d && this._buffer[offset + 1] !== 0x0a) {
            offset++;

            /* istanbul ignore if: activate the js parser out of memory test to test this */
            if (offset >= this._buffer.length) {
                throw new IncompleteReadBuffer('Did not see LF after NL reading multi bulk count (' + offset + ' => ' + this._buffer.length + ', ' + this._offset + ')');
            }
        }

        offset++;
        return offset;
    };

    JavascriptReplyParser.prototype._bytesRemaining = function () {
        return (this._buffer.length - this._offset) < 0 ? 0 : (this._buffer.length - this._offset);
    };

    exports.Parser = JavascriptReplyParser;
    exports.name = 'javascript';