/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation";
import Utils from "../Utils";
/**
* From HTML Entity operation
*/
class FromHTMLEntity extends Operation {
/**
* FromHTMLEntity constructor
*/
constructor() {
super();
this.name = "From HTML Entity";
this.module = "Default";
this.description = "Converts HTML entities back to characters
e.g. & becomes &";
this.infoURL = "https://wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references";
this.inputType = "string";
this.outputType = "string";
this.args = [];
this.patterns = [
{
match: "&(?:#\\d{2,3}|#x[\\da-f]{2}|[a-z]{2,6});",
flags: "i",
args: []
},
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const regex = /&(#?x?[a-zA-Z0-9]{1,8});/g;
let output = "",
m,
i = 0;
while ((m = regex.exec(input))) {
// Add up to match
for (; i < m.index;)
output += input[i++];
// Add match
const bite = entityToByte[m[1]];
if (bite) {
output += Utils.chr(bite);
} else if (!bite && m[1][0] === "#" && m[1].length > 1 && /^#\d{1,6}$/.test(m[1])) {
// Numeric entity (e.g.
)
const num = m[1].slice(1, m[1].length);
output += Utils.chr(parseInt(num, 10));
} else if (!bite && m[1][0] === "#" && m[1].length > 3 && /^#x[\dA-F]{2,8}$/i.test(m[1])) {
// Hex entity (e.g. :)
const hex = m[1].slice(2, m[1].length);
output += Utils.chr(parseInt(hex, 16));
} else {
// Not a valid entity, print as normal
for (; i < regex.lastIndex;)
output += input[i++];
}
i = regex.lastIndex;
}
// Add all after final match
for (; i < input.length;)
output += input[i++];
return output;
}
}
/**
* Lookup table to translate HTML entity codes to their byte values.
*/
const entityToByte = {
"quot": 34,
"amp": 38,
"apos": 39,
"lt": 60,
"gt": 62,
"nbsp": 160,
"iexcl": 161,
"cent": 162,
"pound": 163,
"curren": 164,
"yen": 165,
"brvbar": 166,
"sect": 167,
"uml": 168,
"copy": 169,
"ordf": 170,
"laquo": 171,
"not": 172,
"shy": 173,
"reg": 174,
"macr": 175,
"deg": 176,
"plusmn": 177,
"sup2": 178,
"sup3": 179,
"acute": 180,
"micro": 181,
"para": 182,
"middot": 183,
"cedil": 184,
"sup1": 185,
"ordm": 186,
"raquo": 187,
"frac14": 188,
"frac12": 189,
"frac34": 190,
"iquest": 191,
"Agrave": 192,
"Aacute": 193,
"Acirc": 194,
"Atilde": 195,
"Auml": 196,
"Aring": 197,
"AElig": 198,
"Ccedil": 199,
"Egrave": 200,
"Eacute": 201,
"Ecirc": 202,
"Euml": 203,
"Igrave": 204,
"Iacute": 205,
"Icirc": 206,
"Iuml": 207,
"ETH": 208,
"Ntilde": 209,
"Ograve": 210,
"Oacute": 211,
"Ocirc": 212,
"Otilde": 213,
"Ouml": 214,
"times": 215,
"Oslash": 216,
"Ugrave": 217,
"Uacute": 218,
"Ucirc": 219,
"Uuml": 220,
"Yacute": 221,
"THORN": 222,
"szlig": 223,
"agrave": 224,
"aacute": 225,
"acirc": 226,
"atilde": 227,
"auml": 228,
"aring": 229,
"aelig": 230,
"ccedil": 231,
"egrave": 232,
"eacute": 233,
"ecirc": 234,
"euml": 235,
"igrave": 236,
"iacute": 237,
"icirc": 238,
"iuml": 239,
"eth": 240,
"ntilde": 241,
"ograve": 242,
"oacute": 243,
"ocirc": 244,
"otilde": 245,
"ouml": 246,
"divide": 247,
"oslash": 248,
"ugrave": 249,
"uacute": 250,
"ucirc": 251,
"uuml": 252,
"yacute": 253,
"thorn": 254,
"yuml": 255,
"OElig": 338,
"oelig": 339,
"Scaron": 352,
"scaron": 353,
"Yuml": 376,
"fnof": 402,
"circ": 710,
"tilde": 732,
"Alpha": 913,
"Beta": 914,
"Gamma": 915,
"Delta": 916,
"Epsilon": 917,
"Zeta": 918,
"Eta": 919,
"Theta": 920,
"Iota": 921,
"Kappa": 922,
"Lambda": 923,
"Mu": 924,
"Nu": 925,
"Xi": 926,
"Omicron": 927,
"Pi": 928,
"Rho": 929,
"Sigma": 931,
"Tau": 932,
"Upsilon": 933,
"Phi": 934,
"Chi": 935,
"Psi": 936,
"Omega": 937,
"alpha": 945,
"beta": 946,
"gamma": 947,
"delta": 948,
"epsilon": 949,
"zeta": 950,
"eta": 951,
"theta": 952,
"iota": 953,
"kappa": 954,
"lambda": 955,
"mu": 956,
"nu": 957,
"xi": 958,
"omicron": 959,
"pi": 960,
"rho": 961,
"sigmaf": 962,
"sigma": 963,
"tau": 964,
"upsilon": 965,
"phi": 966,
"chi": 967,
"psi": 968,
"omega": 969,
"thetasym": 977,
"upsih": 978,
"piv": 982,
"ensp": 8194,
"emsp": 8195,
"thinsp": 8201,
"zwnj": 8204,
"zwj": 8205,
"lrm": 8206,
"rlm": 8207,
"ndash": 8211,
"mdash": 8212,
"lsquo": 8216,
"rsquo": 8217,
"sbquo": 8218,
"ldquo": 8220,
"rdquo": 8221,
"bdquo": 8222,
"dagger": 8224,
"Dagger": 8225,
"bull": 8226,
"hellip": 8230,
"permil": 8240,
"prime": 8242,
"Prime": 8243,
"lsaquo": 8249,
"rsaquo": 8250,
"oline": 8254,
"frasl": 8260,
"euro": 8364,
"image": 8465,
"weierp": 8472,
"real": 8476,
"trade": 8482,
"alefsym": 8501,
"larr": 8592,
"uarr": 8593,
"rarr": 8594,
"darr": 8595,
"harr": 8596,
"crarr": 8629,
"lArr": 8656,
"uArr": 8657,
"rArr": 8658,
"dArr": 8659,
"hArr": 8660,
"forall": 8704,
"part": 8706,
"exist": 8707,
"empty": 8709,
"nabla": 8711,
"isin": 8712,
"notin": 8713,
"ni": 8715,
"prod": 8719,
"sum": 8721,
"minus": 8722,
"lowast": 8727,
"radic": 8730,
"prop": 8733,
"infin": 8734,
"ang": 8736,
"and": 8743,
"or": 8744,
"cap": 8745,
"cup": 8746,
"int": 8747,
"there4": 8756,
"sim": 8764,
"cong": 8773,
"asymp": 8776,
"ne": 8800,
"equiv": 8801,
"le": 8804,
"ge": 8805,
"sub": 8834,
"sup": 8835,
"nsub": 8836,
"sube": 8838,
"supe": 8839,
"oplus": 8853,
"otimes": 8855,
"perp": 8869,
"sdot": 8901,
"vellip": 8942,
"lceil": 8968,
"rceil": 8969,
"lfloor": 8970,
"rfloor": 8971,
"lang": 9001,
"rang": 9002,
"loz": 9674,
"spades": 9824,
"clubs": 9827,
"hearts": 9829,
"diams": 9830,
};
export default FromHTMLEntity;