@sutton-signwriting/core/convert/convert.mjs

/**
* Sutton SignWriting Core Module v1.1.0
* https://github.com/Slevinski/SignWriting
* Copyright (c) 2007-2019, Steve Slevinski
* convert.mjs is released under the MIT License.
*/

/**
 * Object of regular expressions for FSW strings
 * 
 *   { symbol, coord, sort, box, prefix, spatial, signbox, sign, term }
 * @alias fsw.re
 * @type {object}
 */
let re = {
  'symbol': 'S[123][0-9a-f]{2}[0-5][0-9a-f]',
  'coord': '[0-9]{3}x[0-9]{3}',
  'sort': 'A',
  'box': '[BLMR]'
};
re.prefix = `(?:${re.sort}(?:${re.symbol})+)`;
re.spatial = `${re.symbol}${re.coord}`;
re.signbox = `${re.box}${re.coord}(?:${re.spatial})*`;
re.sign = `${re.prefix}?${re.signbox}`;
re.term = `${re.prefix}${re.signbox}`;

/**
 * Object of regular expressions for FSW strings
 * 
 *   { symbol, coord, sort, box, prefix, spatial, signbox, sign, term }
 * @alias swu.re
 * @type {object}
 */
let re$1 = {
  'symbol': '(?:(?:\uD8C0[\uDC01-\uDFFF])|(?:[\uD8C1-\uD8FC][\uDC00-\uDFFF])|(?:\uD8FD[\uDC00-\uDC80]))',
  'coord': '(?:\uD836[\uDC0C-\uDDFF]){2}',
  'sort': '\uD836\uDC00',
  'box': '\uD836[\uDC01-\uDC04]'
};
re$1.prefix = `(?:${re$1.sort}(?:${re$1.symbol})+)`;
re$1.spatial = `${re$1.symbol}${re$1.coord}`;
re$1.signbox = `${re$1.box}${re$1.coord}(?:${re$1.spatial})*`;
re$1.sign = `${re$1.prefix}?${re$1.signbox}`;
re$1.term = `${re$1.prefix}${re$1.signbox}`;

/** The convert module contains functions to convert between Formal SignWriitng in ASCII (FSW) and SignWriting in Unicode (SWU) characters, along with other types of data.
 * [Characters set definitions](https://tools.ietf.org/id/draft-slevinski-formal-signwriting-07.html#rfc.section.2.2)
 * @module convert
 */
/**
 * Function to convert an SWU structural marker to FSW equivalent
 * @function convert.swu2mark
 * @param {string} swuMark - character for SWU structural marker
 * @returns {string} FSW structural marker
 * @example
 * convert.swu2mark('𝠀')
 * 
 * return 'A'
 */

const swu2mark = swuMark => {
  return {
    '𝠀': 'A',
    '𝠁': 'B',
    '𝠂': 'L',
    '𝠃': 'M',
    '𝠄': 'R'
  }[swuMark];
};
/**
 * Function to convert an FSW structural marker to SWU equivalent
 * @function convert.mark2swu
 * @param {string} fswMark - character for FSW structural marker
 * @returns {string} SWU structural marker
 * @example
 * convert.mark2swu('A')
 * 
 * return '𝠀'
 */


const mark2swu = fswMark => {
  return {
    'A': '𝠀',
    'B': '𝠁',
    'L': '𝠂',
    'M': '𝠃',
    'R': '𝠄'
  }[fswMark];
};
/**
 * Function to convert an SWU number character to an integer
 * @function convert.swu2num
 * @param {string} swuNum - SWU number character
 * @returns {number} Integer value for number
 * @example
 * convert.swu2num('𝤆')
 * 
 * return 500
 */


const swu2num = swuNum => parseInt(swuNum.codePointAt(0)) - 0x1D80C + 250;
/**
 * Function to convert a number to an SWU number character
 * @function convert.num2swu
 * @param {number} num - Integer value for number
 * @returns {string} SWU number character
 * @example
 * convert.num2swu(500)
 * 
 * return '𝤆'
 */


const num2swu = num => String.fromCodePoint(0x1D80C + parseInt(num) - 250);
/**
 * Function to convert two SWU number characters to an array of x,y integers
 * @function convert.swu2coord
 * @param {string} swuCoord - Two SWU number character
 * @returns {number[]} Array of x,y integers
 * @example
 * convert.swu2coord('𝤆𝤆')
 * 
 * return [500, 500]
 */


const swu2coord = swuCoord => [swu2num(swuCoord.slice(0, 2)), swu2num(swuCoord.slice(2, 4))];
/**
 * Function to convert an array of x,y integers to two SWU number characters
 * @function convert.coord2swu
 * @param {number[]} coord - Array of x,y integers
 * @returns {string} Two SWU number character
 * @example
 * convert.coord2swu([500, 500])
 * 
 * return '𝤆𝤆'
 */


const coord2swu = coord => coord.map(num => num2swu(num)).join('');
/**
 * Function to convert an FSW coordinate string to an array of x,y integers
 * @function convert.fsw2coord
 * @param {string} fswCoord - An FSW coordinate string
 * @returns {number[]} Array of x,y integers
 * @example
 * convert.fsw2coord('500x500')
 * 
 * return [500, 500]
 */


const fsw2coord = fswCoord => fswCoord.split('x').map(num => parseInt(num));
/**
 * Function to convert an array of x,y integers to an FSW coordinate string
 * @function convert.coord2fsw
 * @param {number[]} coord - Array of x,y integers
 * @returns {string} An FSW coordinate string
 * @example
 * convert.coord2fsw([500, 500])
 * 
 * return '500x500'
 */


const coord2fsw = coord => coord.join('x');
/**
 * Function to convert an SWU symbol character to a code point on plane 4
 * @function convert.swu2code
 * @param {string} swuSym - SWU symbol character
 * @returns {number} Code point on plane 4
 * @example
 * convert.swu2code('񀀁')
 * 
 * return 0x40001
 */


const swu2code = swuSym => parseInt(swuSym.codePointAt(0));
/**
 * Function to convert a code point on plane 4 to an SWU symbol character
 * @function convert.code2swu
 * @param {number} code - Code point on plane 4
 * @returns {string} SWU symbol character
 * @example
 * convert.code2swu(0x40001)
 * 
 * return '񀀁'
 */


const code2swu = code => String.fromCodePoint(code);
/**
 * Function to convert an SWU symbol character to a 16-bit ID
 * @function convert.swu2id
 * @param {string} swuSym - SWU symbol character
 * @returns {number} 16-bit ID
 * @example
 * convert.swu2id('񀀁')
 * 
 * return 1
 */


const swu2id = swuSym => swu2code(swuSym) - 0x40000;
/**
 * Function to convert a 16-bit ID to an SWU symbol character
 * @function convert.id2swu
 * @param {number} id - 16-bit ID
 * @returns {string} SWU symbol character
 * @example
 * convert.id2swu(1)
 * 
 * return '񀀁'
 */


const id2swu = id => code2swu(id + 0x40000);
/**
 * Function to convert an FSW symbol key to a 16-bit ID
 * @function convert.key2id
 * @param {string} key - FSW symbol key
 * @returns {number} 16-bit ID
 * @example
 * convert.swu2id('S10000')
 * 
 * return 1
 */


const key2id = key => 1 + (parseInt(key.slice(1, 4), 16) - 256) * 96 + parseInt(key.slice(4, 5), 16) * 16 + parseInt(key.slice(5, 6), 16);
/**
 * Function to convert a 16-bit ID to an FSW symbol key
 * @function convert.id2key
 * @param {number} id - 16-bit ID
 * @returns {string} FSW symbol key
 * @example
 * convert.id2fsw(1)
 * 
 * return 'S10000'
 */


const id2key = id => {
  const symcode = id - 1;
  const base = parseInt(symcode / 96);
  const fill = parseInt((symcode - base * 96) / 16);
  const rotation = parseInt(symcode - base * 96 - fill * 16);
  return 'S' + (base + 0x100).toString(16) + fill.toString(16) + rotation.toString(16);
};
/**
 * Function to convert an SWU symbol character to an FSW symbol key
 * @function convert.swu2key
 * @param {string} swuSym - SWU symbol character
 * @returns {string} FSW symbol key
 * @example
 * convert.swu2key('񀀁')
 * 
 * return 'S10000'
 */


const swu2key = swuSym => {
  const symcode = swu2code(swuSym) - 0x40001;
  const base = parseInt(symcode / 96);
  const fill = parseInt((symcode - base * 96) / 16);
  const rotation = parseInt(symcode - base * 96 - fill * 16);
  return 'S' + (base + 0x100).toString(16) + fill.toString(16) + rotation.toString(16);
};
/**
 * Function to convert an FSW symbol key to an SWU symbol character
 * @function convert.key2swu
 * @param {string} key - FSW symbol key
 * @returns {string} SWU symbol character
 * @example
 * convert.key2swu('S10000')
 * 
 * return '񀀁'
 */


const key2swu = key => code2swu(0x40001 + (parseInt(key.slice(1, 4), 16) - 256) * 96 + parseInt(key.slice(4, 5), 16) * 16 + parseInt(key.slice(5, 6), 16));
/**
 * Function to convert SWU text to FSW text
 * @function convert.swu2fsw
 * @param {string} swuText - SWU text
 * @returns {string} FSW text
 * @example
 * convert.swu2fsw('𝠀񀀒񀀚񋚥񋛩𝠃𝤟𝤩񋛩𝣵𝤐񀀒𝤇𝣤񋚥𝤐𝤆񀀚𝣮𝣭')
 * 
 * return 'AS10011S10019S2e704S2e748M525x535S2e748483x510S10011501x466S2e704510x500S10019476x475'
 */


const swu2fsw = swuText => {
  if (!swuText) return '';
  let fsw = swuText.replace(/𝠀/g, "A").replace(/𝠁/g, "B").replace(/𝠂/g, "L").replace(/𝠃/g, "M").replace(/𝠄/g, "R");
  const syms = fsw.match(new RegExp(re$1.symbol, 'g'));

  if (syms) {
    syms.forEach(function (sym) {
      fsw = fsw.replace(sym, swu2key(sym));
    });
  }

  const coords = fsw.match(new RegExp(re$1.coord, 'g'));

  if (coords) {
    coords.forEach(function (coord) {
      fsw = fsw.replace(coord, swu2coord(coord).join('x'));
    });
  }

  return fsw;
};
/**
 * Function to convert FSW text to SWU text
 * @function convert.fsw2swu
 * @param {string} fswText - FSW text
 * @returns {string} SWU text
 * @example
 * convert.fsw2swu('AS10011S10019S2e704S2e748M525x535S2e748483x510S10011501x466S2e704510x500S10019476x475')
 * 
 * return '𝠀񀀒񀀚񋚥񋛩𝠃𝤟𝤩񋛩𝣵𝤐񀀒𝤇𝣤񋚥𝤐𝤆񀀚𝣮𝣭'
 */


const fsw2swu = fswText => {
  if (!fswText) return '';
  const prefixes = fswText.match(new RegExp(re.prefix, 'g'));

  if (prefixes) {
    prefixes.forEach(function (prefix) {
      fswText = fswText.replace(prefix, '𝠀' + prefix.slice(1).match(/.{6}/g).map(key => key2swu(key)).join(''));
    });
  }

  const boxes = fswText.match(new RegExp(re.box + re.coord, 'g'));

  if (boxes) {
    boxes.forEach(function (boxes) {
      fswText = fswText.replace(boxes, mark2swu(boxes.slice(0, 1)) + coord2swu(fsw2coord(boxes.slice(1, 8))));
    });
  }

  const spatials = fswText.match(new RegExp(re.spatial, 'g'));

  if (spatials) {
    spatials.forEach(function (spatial) {
      fswText = fswText.replace(spatial, key2swu(spatial.slice(0, 6)) + coord2swu(fsw2coord(spatial.slice(6, 13))));
    });
  }

  return fswText;
};

export { code2swu, coord2fsw, coord2swu, fsw2coord, fsw2swu, id2key, id2swu, key2id, key2swu, mark2swu, num2swu, swu2code, swu2coord, swu2fsw, swu2id, swu2key, swu2mark, swu2num };

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