# All files / src/utils cea-608-parser.js

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     /**
     *
     * This code was ported from the dash.js project at:
     *   https://github.com/Dash-Industry-Forum/dash.js/blob/development/externals/cea608-parser.js
     *   https://github.com/Dash-Industry-Forum/dash.js/commit/8269b26a761e0853bb21d78780ed945144ecdd4d#diff-71bc295a2d6b6b7093a1d3290d53a4b2
     *
     * The original copyright appears below:
     *
     * The copyright in this software is being made available under the BSD License,
     * included below. This software may be subject to other third party and contributor
     * rights, including patent rights, and no such rights are granted under this license.
     *
     * Copyright (c) 2015-2016, DASH Industry Forum.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     *  1. Redistributions of source code must retain the above copyright notice, this
     *  list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright notice,
     *  this list of conditions and the following disclaimer in the documentation and/or
     *  other materials provided with the distribution.
     *  2. Neither the name of Dash Industry Forum nor the names of its
     *  contributors may be used to endorse or promote products derived from this software
     *  without specific prior written permission.
     *
     *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
     *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     *  POSSIBILITY OF SUCH DAMAGE.
     */
        /**
         *  Exceptions from regular ASCII. CodePoints are mapped to UTF-16 codes
         */

    var specialCea608CharsCodes = {
        0x2a : 0xe1, // lowercase a, acute accent
        0x5c : 0xe9, // lowercase e, acute accent
        0x5e : 0xed, // lowercase i, acute accent
        0x5f : 0xf3, // lowercase o, acute accent
        0x60 : 0xfa, // lowercase u, acute accent
        0x7b : 0xe7, // lowercase c with cedilla
        0x7c : 0xf7, // division symbol
        0x7d : 0xd1, // uppercase N tilde
        0x7e : 0xf1, // lowercase n tilde
        0x7f : 0x2588, // Full block
        // THIS BLOCK INCLUDES THE 16 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
        // THAT COME FROM HI BYTE=0x11 AND LOW BETWEEN 0x30 AND 0x3F
        // THIS MEANS THAT \x50 MUST BE ADDED TO THE VALUES
        0x80 : 0xae, // Registered symbol (R)
        0x81 : 0xb0, // degree sign
        0x82 : 0xbd, // 1/2 symbol
        0x83 : 0xbf, // Inverted (open) question mark
        0x84 : 0x2122, // Trademark symbol (TM)
        0x85 : 0xa2, // Cents symbol
        0x86 : 0xa3, // Pounds sterling
        0x87 : 0x266a, // Music 8'th note
        0x88 : 0xe0, // lowercase a, grave accent
        0x89 : 0x20, // transparent space (regular)
        0x8a : 0xe8, // lowercase e, grave accent
        0x8b : 0xe2, // lowercase a, circumflex accent
        0x8c : 0xea, // lowercase e, circumflex accent
        0x8d : 0xee, // lowercase i, circumflex accent
        0x8e : 0xf4, // lowercase o, circumflex accent
        0x8f : 0xfb, // lowercase u, circumflex accent
        // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
        // THAT COME FROM HI BYTE=0x12 AND LOW BETWEEN 0x20 AND 0x3F
        0x90 : 0xc1, // capital letter A with acute
        0x91 : 0xc9, // capital letter E with acute
        0x92 : 0xd3, // capital letter O with acute
        0x93 : 0xda, // capital letter U with acute
        0x94 : 0xdc, // capital letter U with diaresis
        0x95 : 0xfc, // lowercase letter U with diaeresis
        0x96 : 0x2018, // opening single quote
        0x97 : 0xa1, // inverted exclamation mark
        0x98 : 0x2a, // asterisk
        0x99 : 0x2019, // closing single quote
        0x9a : 0x2501, // box drawings heavy horizontal
        0x9b : 0xa9, // copyright sign
        0x9c : 0x2120, // Service mark
        0x9d : 0x2022, // (round) bullet
        0x9e : 0x201c, // Left double quotation mark
        0x9f : 0x201d, // Right double quotation mark
        0xa0 : 0xc0, // uppercase A, grave accent
        0xa1 : 0xc2, // uppercase A, circumflex
        0xa2 : 0xc7, // uppercase C with cedilla
        0xa3 : 0xc8, // uppercase E, grave accent
        0xa4 : 0xca, // uppercase E, circumflex
        0xa5 : 0xcb, // capital letter E with diaresis
        0xa6 : 0xeb, // lowercase letter e with diaresis
        0xa7 : 0xce, // uppercase I, circumflex
        0xa8 : 0xcf, // uppercase I, with diaresis
        0xa9 : 0xef, // lowercase i, with diaresis
        0xaa : 0xd4, // uppercase O, circumflex
        0xab : 0xd9, // uppercase U, grave accent
        0xac : 0xf9, // lowercase u, grave accent
        0xad : 0xdb, // uppercase U, circumflex
        0xae : 0xab, // left-pointing double angle quotation mark
        0xaf : 0xbb, // right-pointing double angle quotation mark
        // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
        // THAT COME FROM HI BYTE=0x13 AND LOW BETWEEN 0x20 AND 0x3F
        0xb0 : 0xc3, // Uppercase A, tilde
        0xb1 : 0xe3, // Lowercase a, tilde
        0xb2 : 0xcd, // Uppercase I, acute accent
        0xb3 : 0xcc, // Uppercase I, grave accent
        0xb4 : 0xec, // Lowercase i, grave accent
        0xb5 : 0xd2, // Uppercase O, grave accent
        0xb6 : 0xf2, // Lowercase o, grave accent
        0xb7 : 0xd5, // Uppercase O, tilde
        0xb8 : 0xf5, // Lowercase o, tilde
        0xb9 : 0x7b, // Open curly brace
        0xba : 0x7d, // Closing curly brace
        0xbb : 0x5c, // Backslash
        0xbc : 0x5e, // Caret
        0xbd : 0x5f, // Underscore
        0xbe : 0x7c, // Pipe (vertical line)
        0xbf : 0x223c, // Tilde operator
        0xc0 : 0xc4, // Uppercase A, umlaut
        0xc1 : 0xe4, // Lowercase A, umlaut
        0xc2 : 0xd6, // Uppercase O, umlaut
        0xc3 : 0xf6, // Lowercase o, umlaut
        0xc4 : 0xdf, // Esszett (sharp S)
        0xc5 : 0xa5, // Yen symbol
        0xc6 : 0xa4, // Generic currency sign
        0xc7 : 0x2503, // Box drawings heavy vertical
        0xc8 : 0xc5, // Uppercase A, ring
        0xc9 : 0xe5, // Lowercase A, ring
        0xca : 0xd8, // Uppercase O, stroke
        0xcb : 0xf8, // Lowercase o, strok
        0xcc : 0x250f, // Box drawings heavy down and right
        0xcd : 0x2513, // Box drawings heavy down and left
        0xce : 0x2517, // Box drawings heavy up and right
        0xcf : 0x251b // Box drawings heavy up and left
    };

    /**
     * Utils
     */
    var getCharForByte = function(byte) {
        var charCode = byte;
        if (specialCea608CharsCodes.hasOwnProperty(byte)) {
            charCode = specialCea608CharsCodes[byte];
        }
        return String.fromCharCode(charCode);
    };

    var NR_ROWS = 15,
        NR_COLS = 100;
    // Tables to look up row from PAC data
    var rowsLowCh1 = {0x11 : 1, 0x12 : 3, 0x15 : 5, 0x16 : 7, 0x17 : 9, 0x10 : 11, 0x13 : 12, 0x14 : 14};
    var rowsHighCh1 = {0x11 : 2, 0x12 : 4, 0x15 : 6, 0x16 : 8, 0x17 : 10, 0x13 : 13, 0x14 : 15};
    var rowsLowCh2 = {0x19 : 1, 0x1A : 3, 0x1D : 5, 0x1E : 7, 0x1F : 9, 0x18 : 11, 0x1B : 12, 0x1C : 14};
    var rowsHighCh2 = {0x19 : 2, 0x1A : 4, 0x1D : 6, 0x1E : 8, 0x1F : 10, 0x1B : 13, 0x1C : 15};

    var backgroundColors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'black', 'transparent'];

    /**
     * Simple logger class to be able to write with time-stamps and filter on level.
     */
    var logger = {
        verboseFilter : {'DATA' : 3, 'DEBUG' : 3, 'INFO' : 2, 'WARNING' : 2, 'TEXT' : 1, 'ERROR' : 0},
        time : null,
        verboseLevel : 0, // Only write errors
        setTime : function(newTime) {
            this.time = newTime;
        },
        log : function(severity, msg) {
            var minLevel = this.verboseFilter[severity];
            if (this.verboseLevel >= minLevel) {
                console.log(this.time + ' [' + severity + '] ' + msg);
            }
        }
    };

    var numArrayToHexArray = function(numArray) {
        var hexArray = [];
        for (var j = 0; j < numArray.length; j++) {
            hexArray.push(numArray[j].toString(16));
        }
        return hexArray;
    };

    class PenState {

        constructor(foreground, underline, italics, background, flash) {
            this.foreground = foreground || 'white';
            this.underline = underline || false;
            this.italics = italics || false;
            this.background = background || 'black';
            this.flash = flash || false;
        }

        reset() {
            this.foreground = 'white';
            this.underline = false;
            this.italics = false;
            this.background = 'black';
            this.flash = false;
        }

        setStyles(styles) {
            var attribs = ['foreground', 'underline', 'italics', 'background', 'flash'];
            for (var i = 0 ; i < attribs.length; i++) {
                var style = attribs[i];
                if (styles.hasOwnProperty(style)) {
                    this[style] = styles[style];
                }
            }
        }

        isDefault() {
            return (this.foreground === 'white' && !this.underline && !this.italics &&
                    this.background === 'black' && !this.flash);
        }

        equals(other) {
            return ( (this.foreground === other.foreground) &&
                     (this.underline === other.underline) &&
                     (this.italics === other.italics) &&
                     (this.background === other.background) &&
                     (this.flash === other.flash) );
        }

        copy(newPenState) {
            this.foreground = newPenState.foreground;
            this.underline = newPenState.underline;
            this.italics = newPenState.italics;
            this.background = newPenState.background;
            this.flash = newPenState.flash;
        }

        toString() {
            return ('color=' + this.foreground + ', underline=' + this.underline + ', italics=' + this.italics +
                ', background=' + this.background + ', flash=' + this.flash);
        }
    }

    /**
     * Unicode character with styling and background.
     * @constructor
     */
    class StyledUnicodeChar
    {

        constructor(uchar, foreground, underline, italics, background, flash) {
            this.uchar = uchar || ' '; // unicode character
            this.penState = new PenState(foreground, underline,italics, background, flash);
        }

        reset() {
            this.uchar = ' ';
            this.penState.reset();
        }

        setChar(uchar, newPenState) {
            this.uchar = uchar;
            this.penState.copy(newPenState);
        }

        setPenState(newPenState) {
            this.penState.copy(newPenState);
        }

        equals(other) {
            return this.uchar === other.uchar && this.penState.equals(other.penState);
        }

        copy(newChar) {
            this.uchar = newChar.uchar;
            this.penState.copy(newChar.penState);
        }

        isEmpty() {
            return this.uchar === ' ' && this.penState.isDefault();
        }
    }

    /**
     * CEA-608 row consisting of NR_COLS instances of StyledUnicodeChar.
     * @constructor
     */
    class Row {
        constructor() {
            this.chars = [];
            for (var i = 0 ; i < NR_COLS ; i++) {
                this.chars.push(new StyledUnicodeChar());
            }
            this.pos = 0;
            this.currPenState = new PenState();
        }

        equals(other) {
            var equal = true;
            for (var i = 0 ; i < NR_COLS; i ++) {
                if (!this.chars[i].equals(other.chars[i])) {
                    equal = false;
                    break;
                }
            }
            return equal;
        }

        copy(other) {
            for (var i = 0 ; i < NR_COLS; i ++) {
                this.chars[i].copy(other.chars[i]);
            }
        }

        isEmpty() {
            var empty = true;
            for (var i = 0 ; i < NR_COLS; i ++) {
                if (!this.chars[i].isEmpty()) {
                    empty = false;
                    break;
                }
            }
            return empty;
        }

        /**
         *  Set the cursor to a valid column.
         */
        setCursor(absPos) {
            if (this.pos !== absPos) {
                this.pos = absPos;
            }
            if (this.pos < 0) {
                logger.log('ERROR', 'Negative cursor position ' + this.pos);
                this.pos = 0;
            } else if (this.pos > NR_COLS) {
                logger.log('ERROR', 'Too large cursor position ' + this.pos);
                this.pos = NR_COLS;
            }
        }

        /**
         * Move the cursor relative to current position.
         */
        moveCursor(relPos) {
            var newPos = this.pos + relPos;
            if (relPos > 1) {
                for (var i = this.pos+1; i < newPos+1 ; i++) {
                    this.chars[i].setPenState(this.currPenState);
                }
            }
            this.setCursor(newPos);
        }

        /**
         * Backspace, move one step back and clear character.
         */
        backSpace() {
            this.moveCursor(-1);
            this.chars[this.pos].setChar(' ', this.currPenState);
        }

        insertChar(byte) {
            if (byte >= 0x90) { //Extended char
                this.backSpace();
            }
            var char = getCharForByte(byte);
            if (this.pos >= NR_COLS) {
                logger.log('ERROR', 'Cannot insert ' + byte.toString(16) +
                            ' (' + char + ') at position ' + this.pos + '. Skipping it!');
                return;
            }
            this.chars[this.pos].setChar(char, this.currPenState);
            this.moveCursor(1);
        }

        clearFromPos(startPos) {
            var i;
            for (i = startPos ; i < NR_COLS ; i++) {
                this.chars[i].reset();
            }
        }

        clear() {
            this.clearFromPos(0);
            this.pos = 0;
            this.currPenState.reset();
        }

        clearToEndOfRow() {
            this.clearFromPos(this.pos);
        }

        getTextString() {
            var chars = [];
            var empty = true;
            for (var i = 0 ; i < NR_COLS ; i++) {
                var char = this.chars[i].uchar;
                if (char !== ' ') {
                    empty = false;
                }
                chars.push(char);
            }
            if (empty) {
                return '';
            } else {
                return chars.join('');
            }
        }

        setPenStyles(styles) {
            this.currPenState.setStyles(styles);
            var currChar = this.chars[this.pos];
            currChar.setPenState(this.currPenState);
        }
    }

    /**
     * Keep a CEA-608 screen of 32x15 styled characters
     * @constructor
    */
    class CaptionScreen {

        constructor() {
            this.rows = [];
            for (var i = 0 ; i <  NR_ROWS; i++) {
                this.rows.push(new Row()); // Note that we use zero-based numbering (0-14)
            }
            this.currRow = NR_ROWS - 1;
            this.nrRollUpRows = null;
            this.reset();
        }

        reset() {
            for (var i = 0 ; i < NR_ROWS ; i++) {
                this.rows[i].clear();
            }
            this.currRow = NR_ROWS - 1;
        }

        equals(other) {
            var equal = true;
            for (var i = 0 ; i < NR_ROWS ; i++) {
                if (!this.rows[i].equals(other.rows[i])) {
                    equal = false;
                    break;
                }
            }
            return equal;
        }

        copy(other) {
            for (var i = 0 ; i < NR_ROWS ; i++) {
                this.rows[i].copy(other.rows[i]);
            }
        }

        isEmpty() {
            var empty = true;
            for (var i = 0 ; i < NR_ROWS ; i++) {
                if (!this.rows[i].isEmpty()) {
                    empty = false;
                    break;
                }
            }
            return empty;
        }

        backSpace() {
            var row = this.rows[this.currRow];
            row.backSpace();
        }

        clearToEndOfRow() {
            var row = this.rows[this.currRow];
            row.clearToEndOfRow();
        }

        /**
         * Insert a character (without styling) in the current row.
         */
        insertChar(char) {
            var row = this.rows[this.currRow];
            row.insertChar(char);
        }

        setPen(styles) {
            var row = this.rows[this.currRow];
            row.setPenStyles(styles);
        }

        moveCursor(relPos) {
            var row = this.rows[this.currRow];
            row.moveCursor(relPos);
        }

        setCursor(absPos) {
            logger.log('INFO', 'setCursor: ' + absPos);
            var row = this.rows[this.currRow];
            row.setCursor(absPos);
        }

        setPAC(pacData) {
            logger.log('INFO', 'pacData = ' + JSON.stringify(pacData));
            var newRow = pacData.row - 1;
            if (this.nrRollUpRows  && newRow < this.nrRollUpRows - 1) {
                    newRow = this.nrRollUpRows-1;
            }

            //Make sure this only affects Roll-up Captions by checking this.nrRollUpRows
            if (this.nrRollUpRows && this.currRow !== newRow) {
              //clear all rows first
              for (let i = 0; i < NR_ROWS; i++) {
                this.rows[i].clear();
              }

              //Copy this.nrRollUpRows rows from lastOutputScreen and place it in the newRow location
              //topRowIndex - the start of rows to copy (inclusive index)
              var topRowIndex = this.currRow + 1 - (this.nrRollUpRows);
              //We only copy if the last position was already shown.
              //We use the cueStartTime value to check this.
              const lastOutputScreen = this.lastOutputScreen;
              if (lastOutputScreen) {
                var prevLineTime = lastOutputScreen.rows[topRowIndex].cueStartTime;
                if(prevLineTime && prevLineTime < logger.time) {
                  for (let i = 0; i < this.nrRollUpRows; i++) {
                    this.rows[newRow-this.nrRollUpRows+i+1].copy(lastOutputScreen.rows[topRowIndex+i]);
                  }
                }
              }
            }

            this.currRow = newRow;
            var row = this.rows[this.currRow];
            if (pacData.indent !== null) {
                var indent = pacData.indent;
                var prevPos = Math.max(indent-1, 0);
                row.setCursor(pacData.indent);
                pacData.color = row.chars[prevPos].penState.foreground;
            }
            var styles = {foreground : pacData.color, underline : pacData.underline, italics : pacData.italics, background : 'black', flash : false};
            this.setPen(styles);
        }

        /**
         * Set background/extra foreground, but first do back_space, and then insert space (backwards compatibility).
         */
        setBkgData(bkgData) {

            logger.log('INFO', 'bkgData = ' + JSON.stringify(bkgData));
            this.backSpace();
            this.setPen(bkgData);
            this.insertChar(0x20); //Space
        }

        setRollUpRows(nrRows) {
            this.nrRollUpRows = nrRows;
        }

        rollUp() {
            if (this.nrRollUpRows === null) {
                logger.log('DEBUG', 'roll_up but nrRollUpRows not set yet');
                return; //Not properly setup
            }
            logger.log('TEXT', this.getDisplayText());
            var topRowIndex = this.currRow + 1 - this.nrRollUpRows;
            var topRow = this.rows.splice(topRowIndex, 1)[0];
            topRow.clear();
            this.rows.splice(this.currRow, 0, topRow);
            logger.log('INFO', 'Rolling up');
            //logger.log('TEXT', this.get_display_text())
        }

       /**
        * Get all non-empty rows with as unicode text.
        */
        getDisplayText(asOneRow) {
            asOneRow = asOneRow || false;
            var displayText = [];
            var text = '';
            var rowNr = -1;
            for (var i = 0 ; i < NR_ROWS ; i++) {
                var rowText = this.rows[i].getTextString();
                if (rowText) {
                    rowNr = i+1;
                    if (asOneRow) {
                        displayText.push('Row ' + rowNr + ': \'' + rowText + '\'');
                    } else {
                        displayText.push(rowText.trim());
                    }
                }
            }
            if (displayText.length > 0) {
                if (asOneRow) {
                    text = '[' + displayText.join(' | ') + ']';
                } else {
                    text = displayText.join('\n');
                }
            }
            return text;
        }

        getTextAndFormat() {
            return this.rows;
        }
    }

    //var modes = ['MODE_ROLL-UP', 'MODE_POP-ON', 'MODE_PAINT-ON', 'MODE_TEXT'];

    class Cea608Channel
    {
        constructor(channelNumber, outputFilter) {

            this.chNr = channelNumber;
            this.outputFilter = outputFilter;
            this.mode = null;
            this.verbose = 0;
            this.displayedMemory = new CaptionScreen();
            this.nonDisplayedMemory = new CaptionScreen();
            this.lastOutputScreen = new CaptionScreen();
            this.currRollUpRow = this.displayedMemory.rows[NR_ROWS-1];
            this.writeScreen = this.displayedMemory;
            this.mode = null;
            this.cueStartTime = null; // Keeps track of where a cue started.
        }

        reset() {
            this.mode = null;
            this.displayedMemory.reset();
            this.nonDisplayedMemory.reset();
            this.lastOutputScreen.reset();
            this.currRollUpRow = this.displayedMemory.rows[NR_ROWS-1];
            this.writeScreen = this.displayedMemory;
            this.mode = null;
            this.cueStartTime = null;
            this.lastCueEndTime = null;
        }

        getHandler() {
            return this.outputFilter;
        }

        setHandler(newHandler) {
            this.outputFilter = newHandler;
        }

        setPAC(pacData) {
            this.writeScreen.setPAC(pacData);
        }

        setBkgData(bkgData) {
            this.writeScreen.setBkgData(bkgData);
        }

        setMode(newMode) {
            if (newMode === this.mode) {
                return;
            }
            this.mode = newMode;
            logger.log('INFO', 'MODE=' + newMode);
            if (this.mode === 'MODE_POP-ON') {
                this.writeScreen = this.nonDisplayedMemory;
            } else {
                this.writeScreen = this.displayedMemory;
                this.writeScreen.reset();
            }
            if (this.mode !== 'MODE_ROLL-UP') {
                this.displayedMemory.nrRollUpRows = null;
                this.nonDisplayedMemory.nrRollUpRows = null;
            }
            this.mode = newMode;
        }

        insertChars(chars) {
            for (var i = 0 ; i < chars.length ; i++) {
                this.writeScreen.insertChar(chars[i]);
            }
            var screen = this.writeScreen === this.displayedMemory ? 'DISP' : 'NON_DISP';
            logger.log('INFO', screen + ': ' + this.writeScreen.getDisplayText(true));
            if (this.mode === 'MODE_PAINT-ON' || this.mode === 'MODE_ROLL-UP') {
                logger.log('TEXT', 'DISPLAYED: ' + this.displayedMemory.getDisplayText(true));
                this.outputDataUpdate();
            }
        }

        ccRCL() { // Resume Caption Loading (switch mode to Pop On)
            logger.log('INFO', 'RCL - Resume Caption Loading');
            this.setMode('MODE_POP-ON');
        }

        ccBS() { // BackSpace
            logger.log('INFO', 'BS - BackSpace');
            if (this.mode === 'MODE_TEXT') {
                return;
            }
            this.writeScreen.backSpace();
            if (this.writeScreen === this.displayedMemory) {
                this.outputDataUpdate();
            }
        }

        ccAOF() { // Reserved (formerly Alarm Off)
            return;
        }

        ccAON() { // Reserved (formerly Alarm On)
            return;
        }

        ccDER() { // Delete to End of Row
            logger.log('INFO', 'DER- Delete to End of Row');
            this.writeScreen.clearToEndOfRow();
            this.outputDataUpdate();
        }

        ccRU(nrRows) { //Roll-Up Captions-2,3,or 4 Rows
            logger.log('INFO', 'RU(' + nrRows +') - Roll Up');
            this.writeScreen = this.displayedMemory;
            this.setMode('MODE_ROLL-UP');
            this.writeScreen.setRollUpRows(nrRows);
        }

        ccFON() { //Flash On
            logger.log('INFO', 'FON - Flash On');
            this.writeScreen.setPen({flash : true});
        }

        ccRDC() { // Resume Direct Captioning (switch mode to PaintOn)
            logger.log('INFO', 'RDC - Resume Direct Captioning');
            this.setMode('MODE_PAINT-ON');
        }

        ccTR() { // Text Restart in text mode (not supported, however)
            logger.log('INFO', 'TR');
            this.setMode('MODE_TEXT');
        }

        ccRTD() { // Resume Text Display in Text mode (not supported, however)
            logger.log('INFO', 'RTD');
            this.setMode('MODE_TEXT');
        }

        ccEDM() { // Erase Displayed Memory
            logger.log('INFO', 'EDM - Erase Displayed Memory');
            this.displayedMemory.reset();
            this.outputDataUpdate();
        }

        ccCR() { // Carriage Return
            logger.log('CR - Carriage Return');
            this.writeScreen.rollUp();
            this.outputDataUpdate();
        }

        ccENM() { //Erase Non-Displayed Memory
            logger.log('INFO', 'ENM - Erase Non-displayed Memory');
            this.nonDisplayedMemory.reset();
        }

        ccEOC() { //End of Caption (Flip Memories)
            logger.log('INFO', 'EOC - End Of Caption');
            if (this.mode === 'MODE_POP-ON') {
                var tmp = this.displayedMemory;
                this.displayedMemory = this.nonDisplayedMemory;
                this.nonDisplayedMemory = tmp;
                this.writeScreen = this.nonDisplayedMemory;
                logger.log('TEXT', 'DISP: ' + this.displayedMemory.getDisplayText());
            }
            this.outputDataUpdate();
        }

        ccTO(nrCols) { // Tab Offset 1,2, or 3 columns
            logger.log('INFO', 'TO(' + nrCols + ') - Tab Offset');
            this.writeScreen.moveCursor(nrCols);
        }

        ccMIDROW(secondByte) { // Parse MIDROW command
            var styles = {flash : false};
            styles.underline = secondByte % 2 === 1;
            styles.italics = secondByte >= 0x2e;
            if (!styles.italics) {
                var colorIndex = Math.floor(secondByte/2) - 0x10;
                var colors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta'];
                styles.foreground = colors[colorIndex];
            } else {
                styles.foreground = 'white';
            }
            logger.log('INFO', 'MIDROW: ' + JSON.stringify(styles));
            this.writeScreen.setPen(styles);
        }

        outputDataUpdate() {
            var t = logger.time;
            if (t === null) {
                return;
            }
            if (this.outputFilter) {
                if (this.outputFilter.updateData) {
                    this.outputFilter.updateData(t, this.displayedMemory);
                }
                if (this.cueStartTime === null && !this.displayedMemory.isEmpty()) { // Start of a new cue
                    this.cueStartTime = t;
                } else {
                    if (!this.displayedMemory.equals(this.lastOutputScreen)) {
                        if (this.outputFilter.newCue) {
                            this.outputFilter.newCue(this.cueStartTime, t, this.lastOutputScreen);
                        }
                        this.cueStartTime = this.displayedMemory.isEmpty() ? null : t;
                    }
                }
                this.lastOutputScreen.copy(this.displayedMemory);
            }
        }

        cueSplitAtTime(t) {
            if (this.outputFilter) {
                if (!this.displayedMemory.isEmpty()) {
                    if (this.outputFilter.newCue) {
                        this.outputFilter.newCue(this.cueStartTime, t, this.displayedMemory);
                    }
                    this.cueStartTime = t;
                }
            }
        }
    }

    class Cea608Parser {

        constructor(field, out1, out2) {
            this.field = field || 1;
            this.outputs = [out1, out2];
            this.channels = [new Cea608Channel(1, out1), new Cea608Channel(2, out2)];
            this.currChNr = -1; // Will be 1 or 2
            this.lastCmdA = null; // First byte of last command
            this.lastCmdB = null; // Second byte of last command
            this.bufferedData = [];
            this.startTime = null;
            this.lastTime = null;
            this.dataCounters = {'padding' : 0, 'char' : 0, 'cmd' : 0, 'other' : 0};
        }

        getHandler(index) {
            return this.channels[index].getHandler();
        }

        setHandler(index, newHandler) {
            this.channels[index].setHandler(newHandler);
        }

        /**
         * Add data for time t in forms of list of bytes (unsigned ints). The bytes are treated as pairs.
         */
        addData(t, byteList) {
            var cmdFound, a, b,
            charsFound = false;

            this.lastTime = t;
            logger.setTime(t);

            for (var i = 0 ; i < byteList.length ; i+=2) {
                a = byteList[i] & 0x7f;
                b = byteList[i+1] & 0x7f;
                if (a === 0 && b === 0) {
                    this.dataCounters.padding += 2;
                    continue;
                } else {
                    logger.log('DATA', '[' + numArrayToHexArray([byteList[i], byteList[i+1]]) +'] -> (' + numArrayToHexArray([a, b]) + ')');
                }
                cmdFound = this.parseCmd(a, b);
                if (!cmdFound) {
                    cmdFound = this.parseMidrow(a, b);
                }
                if (!cmdFound) {
                    cmdFound = this.parsePAC(a, b);
                }
                if (!cmdFound) {
                    cmdFound = this.parseBackgroundAttributes(a, b);
                }
                if (!cmdFound) {
                    charsFound = this.parseChars(a, b);
                    if (charsFound) {
                        if (this.currChNr && this.currChNr >=0) {
                            var channel = this.channels[this.currChNr-1];
                            channel.insertChars(charsFound);
                        } else {
                            logger.log('WARNING', 'No channel found yet. TEXT-MODE?');
                        }
                    }
                }
                if (cmdFound) {
                    this.dataCounters.cmd += 2;
                } else if (charsFound) {
                    this.dataCounters.char += 2;
                } else {
                    this.dataCounters.other += 2;
                    logger.log('WARNING', 'Couldn\'t parse cleaned data ' + numArrayToHexArray([a, b]) +
                                ' orig: ' + numArrayToHexArray([byteList[i], byteList[i+1]]));
                }
            }
        }

        /**
         * Parse Command.
         * @returns {Boolean} Tells if a command was found
         */
        parseCmd(a, b) {
            var chNr = null;

            var cond1 = (a === 0x14 || a === 0x1C) && (0x20 <= b && b <= 0x2F);
            var cond2 = (a === 0x17 || a === 0x1F) && (0x21 <= b && b <= 0x23);
            if (!(cond1 || cond2)) {
                return false;
            }

            if (a === this.lastCmdA && b === this.lastCmdB) {
                this.lastCmdA = null;
                this.lastCmdB = null; // Repeated commands are dropped (once)
                logger.log('DEBUG', 'Repeated command (' + numArrayToHexArray([a, b]) + ') is dropped');
                return true;
            }

            if (a === 0x14 || a === 0x17) {
                chNr = 1;
            } else {
                chNr = 2; // (a === 0x1C || a=== 0x1f)
            }

            var channel = this.channels[chNr - 1];

            if (a === 0x14 || a === 0x1C) {
                if (b === 0x20) {
                    channel.ccRCL();
                } else if (b === 0x21) {
                    channel.ccBS();
                } else if (b === 0x22) {
                    channel.ccAOF();
                } else if (b === 0x23) {
                    channel.ccAON();
                } else if (b === 0x24) {
                    channel.ccDER();
                } else if (b === 0x25) {
                    channel.ccRU(2);
                } else if (b === 0x26) {
                    channel.ccRU(3);
                } else if (b === 0x27) {
                    channel.ccRU(4);
                } else if (b === 0x28) {
                    channel.ccFON();
                } else if (b === 0x29) {
                    channel.ccRDC();
                } else if (b === 0x2A) {
                    channel.ccTR();
                } else if (b === 0x2B) {
                    channel.ccRTD();
                } else if (b === 0x2C) {
                    channel.ccEDM();
                } else if (b === 0x2D) {
                    channel.ccCR();
                } else if (b === 0x2E) {
                    channel.ccENM();
                } else if (b === 0x2F) {
                    channel.ccEOC();
                }
            } else { //a == 0x17 || a == 0x1F
                channel.ccTO(b - 0x20);
            }
            this.lastCmdA = a;
            this.lastCmdB = b;
            this.currChNr = chNr;
            return true;
        }

        /**
         * Parse midrow styling command
         * @returns {Boolean}
         */
        parseMidrow(a, b) {
            var chNr = null;

            if ( ((a === 0x11) || (a === 0x19)) && 0x20 <= b && b <= 0x2f) {
                if (a === 0x11) {
                    chNr = 1;
                } else  {
                    chNr = 2;
                }
                if (chNr !== this.currChNr) {
                    logger.log('ERROR', 'Mismatch channel in midrow parsing');
                    return false;
                }
                var channel = this.channels[chNr-1];
                channel.ccMIDROW(b);
                logger.log('DEBUG', 'MIDROW (' + numArrayToHexArray([a, b]) + ')');
                return true;
            }
            return false;
        }
        /**
         * Parse Preable Access Codes (Table 53).
         * @returns {Boolean} Tells if PAC found
         */
        parsePAC(a, b) {

           var chNr = null;
           var row = null;

            var case1 = ((0x11 <= a  && a <= 0x17) || (0x19 <= a && a <= 0x1F)) && (0x40 <= b && b <= 0x7F);
            var case2 = (a === 0x10 || a === 0x18) && (0x40 <= b && b <= 0x5F);
            if (! (case1 || case2)) {
                return false;
            }

            if (a === this.lastCmdA && b === this.lastCmdB) {
                this.lastCmdA = null;
                this.lastCmdB = null;
                return true; // Repeated commands are dropped (once)
            }

            chNr = (a <= 0x17) ? 1 : 2;

            if (0x40 <= b && b <= 0x5F) {
                row = (chNr === 1) ? rowsLowCh1[a] : rowsLowCh2[a];
            } else { // 0x60 <= b <= 0x7F
                row = (chNr === 1) ? rowsHighCh1[a] : rowsHighCh2[a];
            }
            var pacData = this.interpretPAC(row, b);
            var channel = this.channels[chNr-1];
            channel.setPAC(pacData);
            this.lastCmdA = a;
            this.lastCmdB = b;
            this.currChNr = chNr;
            return true;
        }

        /**
         * Interpret the second byte of the pac, and return the information.
         * @returns {Object} pacData with style parameters.
         */
        interpretPAC(row, byte) {
            var pacIndex = byte;
            var pacData = {color : null, italics : false, indent : null, underline : false, row : row};

            if (byte > 0x5F) {
                pacIndex = byte - 0x60;
            } else {
                pacIndex = byte - 0x40;
            }
            pacData.underline = (pacIndex & 1) === 1;
            if (pacIndex <= 0xd) {
                pacData.color = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'white'][Math.floor(pacIndex/2)];
            } else if (pacIndex <= 0xf) {
                pacData.italics = true;
                pacData.color = 'white';
            } else {
                pacData.indent = (Math.floor((pacIndex-0x10)/2))*4;
            }
            return pacData; // Note that row has zero offset. The spec uses 1.
        }

        /**
         * Parse characters.
         * @returns An array with 1 to 2 codes corresponding to chars, if found. null otherwise.
         */
        parseChars(a, b) {

           var  channelNr = null,
                charCodes = null,
                charCode1 = null;

            if (a >= 0x19) {
                channelNr = 2;
                charCode1 = a - 8;
            } else {
                channelNr = 1;
                charCode1 = a;
            }
            if (0x11 <= charCode1 && charCode1 <= 0x13) {
                // Special character
                var oneCode = b;
                if (charCode1 === 0x11) {
                    oneCode = b + 0x50;
                } else if (charCode1 === 0x12) {
                    oneCode = b + 0x70;
                } else {
                    oneCode = b + 0x90;
                }
                logger.log('INFO', 'Special char \'' + getCharForByte(oneCode) + '\' in channel ' + channelNr);
                charCodes = [oneCode];
            } else if (0x20 <= a && a <= 0x7f) {
                charCodes = (b === 0) ? [a] : [a, b];
            }
            if (charCodes) {
                var hexCodes = numArrayToHexArray(charCodes);
                logger.log('DEBUG', 'Char codes =  ' + hexCodes.join(','));
                this.lastCmdA = null;
                this.lastCmdB = null;
            }
            return charCodes;
        }

        /**
        * Parse extended background attributes as well as new foreground color black.
        * @returns{Boolean} Tells if background attributes are found
        */
        parseBackgroundAttributes(a, b) {
           var  bkgData,
                index,
                chNr,
                channel;

            var case1 = (a === 0x10 || a === 0x18) && (0x20 <= b && b <= 0x2f);
            var case2 = (a === 0x17 || a === 0x1f) && (0x2d <=b && b <= 0x2f);
            if (!(case1 || case2)) {
                return false;
            }
            bkgData = {};
            if (a  === 0x10 || a === 0x18) {
                index = Math.floor((b-0x20)/2);
                bkgData.background = backgroundColors[index];
                if (b % 2 === 1) {
                    bkgData.background = bkgData.background + '_semi';
                }
            } else if (b === 0x2d) {
                bkgData.background = 'transparent';
            } else {
                bkgData.foreground = 'black';
                if (b === 0x2f) {
                    bkgData.underline = true;
                }
            }
            chNr = (a < 0x18) ? 1 : 2;
            channel = this.channels[chNr-1];
            channel.setBkgData(bkgData);
            this.lastCmdA = null;
            this.lastCmdB = null;
            return true;
        }

        /**
         * Reset state of parser and its channels.
         */
        reset() {
            for (var i=0 ; i < this.channels.length ; i++) {
                if (this.channels[i]) {
                    this.channels[i].reset();
                }
            }
            this.lastCmdA = null;
            this.lastCmdB = null;
        }

        /**
         * Trigger the generation of a cue, and the start of a new one if displayScreens are not empty.
         */
        cueSplitAtTime(t) {
            for (var i=0 ; i < this.channels.length ; i++) {
                if (this.channels[i]) {
                    this.channels[i].cueSplitAtTime(t);
                }
            }
        }
    }

    export default Cea608Parser;