A Pen by Kevin

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Kevin
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  1. A Pen by Kevin Previews
  2. A Pen by Kevin HTML Codes
  3. A Pen by Kevin JS Codes

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What is a a pen by kevin? How do you make a a pen by kevin? This script and codes were developed by Kevin on 28 August 2022, Sunday.

A Pen by Kevin Previews
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A Pen by Kevin - Script Codes HTML Codes

<!DOCTYPE html>
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<head> <meta charset="UTF-8"> <title>A Pen by Kevin</title>
</head>
<body> <script src="js/index.js"></script>
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A Pen by Kevin - Script Codes JS Codes

// this function is taken from Acorn [1], written by Marijn Haverbeke
// [1] https://github.com/marijnh/acorn
function makePredicate(words) { if (!(words instanceof Array)) words = words.split(" "); var f = "", cats = []; out: for (var i = 0; i < words.length; ++i) { for (var j = 0; j < cats.length; ++j) if (cats[j][0].length == words[i].length) { cats[j].push(words[i]); continue out; } cats.push([words[i]]); } function compareTo(arr) { if (arr.length == 1) return f += "return str === " + JSON.stringify(arr[0]) + ";"; f += "switch(str){"; for (var i = 0; i < arr.length; ++i) f += "case " + JSON.stringify(arr[i]) + ":"; f += "return true}return false;"; } // When there are more than three length categories, an outer // switch first dispatches on the lengths, to save on comparisons. if (cats.length > 3) { cats.sort(function(a, b) {return b.length - a.length;}); f += "switch(str.length){"; for (var i = 0; i < cats.length; ++i) { var cat = cats[i]; f += "case " + cat[0].length + ":"; compareTo(cat); } f += "}"; // Otherwise, simply generate a flat `switch` statement. } else { compareTo(words); } return new Function("str", f);
};
var KEYWORDS = 'break case catch const continue debugger default delete do else finally for function if in instanceof new return switch throw try typeof var void while with';
var KEYWORDS_ATOM = 'false null true';
var RESERVED_WORDS = 'abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized this throws transient volatile yield' + " " + KEYWORDS_ATOM + " " + KEYWORDS;
var KEYWORDS_BEFORE_EXPRESSION = 'return new delete throw else case';
KEYWORDS = makePredicate(KEYWORDS);
RESERVED_WORDS = makePredicate(RESERVED_WORDS);
KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION);
KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM);
//操作符
var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^"));
var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;//十六进制
var RE_OCT_NUMBER = /^0[0-7]+$/;//八进制
//操作符
var OPERATORS = makePredicate([ "in", "instanceof", "typeof", "new", "void", "delete", "++", "--", "+", "-", "!", "~", "&", "|", "^", "*", "/", "%", ">>", "<<", ">>>", "<", ">", "<=", ">=", "==", "===", "!=", "!==", "?", "=", "+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=", "&&", "||"
]);
//空白字符
var WHITESPACE_CHARS = makePredicate(characters(" \u00a0\n\r\t\f\u000b\u200b\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\uFEFF"));
var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,.;:"));
//PUNC符号
var PUNC_CHARS = makePredicate(characters("[]{}(),;:"));
//正则修正符
var REGEXP_MODIFIERS = makePredicate(characters("gmsiy"));
// regexps adapted from http://xregexp.com/plugins/#unicode
var UNICODE = { letter: new RegExp("[\\u0041-\\u005A\\u0061-\\u007A\\u00AA\\u00B5\\u00BA\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05D0-\\u05EA\\u05F0-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u08A0-\\u08B2\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58\\u0C59\\u0C60\\u0C61\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D05-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D60\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E87\\u0E88\\u0E8A\\u0E8D\\u0E94-\\u0E97\\u0E99-\\u0E9F\\u0EA1-\\u0EA3\\u0EA5\\u0EA7\\u0EAA\\u0EAB\\u0EAD-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F4\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1877\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19C1-\\u19C7\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1CE9-\\u1CEC\\u1CEE-\\u1CF1\\u1CF5\\u1CF6\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2119-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u212D\\u212F-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2E2F\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309D-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312D\\u3131-\\u318E\\u31A0-\\u31BA\\u31F0-\\u31FF\\u3400-\\u4DB5\\u4E00-\\u9FCC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA78E\\uA790-\\uA7AD\\uA7B0\\uA7B1\\uA7F7-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB5F\\uAB64\\uAB65\\uABC0-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]"), digit: new RegExp("[\\u0030-\\u0039\\u0660-\\u0669\\u06F0-\\u06F9\\u07C0-\\u07C9\\u0966-\\u096F\\u09E6-\\u09EF\\u0A66-\\u0A6F\\u0AE6-\\u0AEF\\u0B66-\\u0B6F\\u0BE6-\\u0BEF\\u0C66-\\u0C6F\\u0CE6-\\u0CEF\\u0D66-\\u0D6F\\u0DE6-\\u0DEF\\u0E50-\\u0E59\\u0ED0-\\u0ED9\\u0F20-\\u0F29\\u1040-\\u1049\\u1090-\\u1099\\u17E0-\\u17E9\\u1810-\\u1819\\u1946-\\u194F\\u19D0-\\u19D9\\u1A80-\\u1A89\\u1A90-\\u1A99\\u1B50-\\u1B59\\u1BB0-\\u1BB9\\u1C40-\\u1C49\\u1C50-\\u1C59\\uA620-\\uA629\\uA8D0-\\uA8D9\\uA900-\\uA909\\uA9D0-\\uA9D9\\uA9F0-\\uA9F9\\uAA50-\\uAA59\\uABF0-\\uABF9\\uFF10-\\uFF19]"), non_spacing_mark: new RegExp("[\\u0300-\\u036F\\u0483-\\u0487\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u0610-\\u061A\\u064B-\\u065E\\u0670\\u06D6-\\u06DC\\u06DF-\\u06E4\\u06E7\\u06E8\\u06EA-\\u06ED\\u0711\\u0730-\\u074A\\u07A6-\\u07B0\\u07EB-\\u07F3\\u0816-\\u0819\\u081B-\\u0823\\u0825-\\u0827\\u0829-\\u082D\\u0900-\\u0902\\u093C\\u0941-\\u0948\\u094D\\u0951-\\u0955\\u0962\\u0963\\u0981\\u09BC\\u09C1-\\u09C4\\u09CD\\u09E2\\u09E3\\u0A01\\u0A02\\u0A3C\\u0A41\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A70\\u0A71\\u0A75\\u0A81\\u0A82\\u0ABC\\u0AC1-\\u0AC5\\u0AC7\\u0AC8\\u0ACD\\u0AE2\\u0AE3\\u0B01\\u0B3C\\u0B3F\\u0B41-\\u0B44\\u0B4D\\u0B56\\u0B62\\u0B63\\u0B82\\u0BC0\\u0BCD\\u0C3E-\\u0C40\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C62\\u0C63\\u0CBC\\u0CBF\\u0CC6\\u0CCC\\u0CCD\\u0CE2\\u0CE3\\u0D41-\\u0D44\\u0D4D\\u0D62\\u0D63\\u0DCA\\u0DD2-\\u0DD4\\u0DD6\\u0E31\\u0E34-\\u0E3A\\u0E47-\\u0E4E\\u0EB1\\u0EB4-\\u0EB9\\u0EBB\\u0EBC\\u0EC8-\\u0ECD\\u0F18\\u0F19\\u0F35\\u0F37\\u0F39\\u0F71-\\u0F7E\\u0F80-\\u0F84\\u0F86\\u0F87\\u0F90-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u102D-\\u1030\\u1032-\\u1037\\u1039\\u103A\\u103D\\u103E\\u1058\\u1059\\u105E-\\u1060\\u1071-\\u1074\\u1082\\u1085\\u1086\\u108D\\u109D\\u135F\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17B7-\\u17BD\\u17C6\\u17C9-\\u17D3\\u17DD\\u180B-\\u180D\\u18A9\\u1920-\\u1922\\u1927\\u1928\\u1932\\u1939-\\u193B\\u1A17\\u1A18\\u1A56\\u1A58-\\u1A5E\\u1A60\\u1A62\\u1A65-\\u1A6C\\u1A73-\\u1A7C\\u1A7F\\u1B00-\\u1B03\\u1B34\\u1B36-\\u1B3A\\u1B3C\\u1B42\\u1B6B-\\u1B73\\u1B80\\u1B81\\u1BA2-\\u1BA5\\u1BA8\\u1BA9\\u1C2C-\\u1C33\\u1C36\\u1C37\\u1CD0-\\u1CD2\\u1CD4-\\u1CE0\\u1CE2-\\u1CE8\\u1CED\\u1DC0-\\u1DE6\\u1DFD-\\u1DFF\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2CEF-\\u2CF1\\u2DE0-\\u2DFF\\u302A-\\u302F\\u3099\\u309A\\uA66F\\uA67C\\uA67D\\uA6F0\\uA6F1\\uA802\\uA806\\uA80B\\uA825\\uA826\\uA8C4\\uA8E0-\\uA8F1\\uA926-\\uA92D\\uA947-\\uA951\\uA980-\\uA982\\uA9B3\\uA9B6-\\uA9B9\\uA9BC\\uAA29-\\uAA2E\\uAA31\\uAA32\\uAA35\\uAA36\\uAA43\\uAA4C\\uAAB0\\uAAB2-\\uAAB4\\uAAB7\\uAAB8\\uAABE\\uAABF\\uAAC1\\uABE5\\uABE8\\uABED\\uFB1E\\uFE00-\\uFE0F\\uFE20-\\uFE26]"), space_combining_mark: new RegExp("[\\u0903\\u093E-\\u0940\\u0949-\\u094C\\u094E\\u0982\\u0983\\u09BE-\\u09C0\\u09C7\\u09C8\\u09CB\\u09CC\\u09D7\\u0A03\\u0A3E-\\u0A40\\u0A83\\u0ABE-\\u0AC0\\u0AC9\\u0ACB\\u0ACC\\u0B02\\u0B03\\u0B3E\\u0B40\\u0B47\\u0B48\\u0B4B\\u0B4C\\u0B57\\u0BBE\\u0BBF\\u0BC1\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCC\\u0BD7\\u0C01-\\u0C03\\u0C41-\\u0C44\\u0C82\\u0C83\\u0CBE\\u0CC0-\\u0CC4\\u0CC7\\u0CC8\\u0CCA\\u0CCB\\u0CD5\\u0CD6\\u0D02\\u0D03\\u0D3E-\\u0D40\\u0D46-\\u0D48\\u0D4A-\\u0D4C\\u0D57\\u0D82\\u0D83\\u0DCF-\\u0DD1\\u0DD8-\\u0DDF\\u0DF2\\u0DF3\\u0F3E\\u0F3F\\u0F7F\\u102B\\u102C\\u1031\\u1038\\u103B\\u103C\\u1056\\u1057\\u1062-\\u1064\\u1067-\\u106D\\u1083\\u1084\\u1087-\\u108C\\u108F\\u109A-\\u109C\\u17B6\\u17BE-\\u17C5\\u17C7\\u17C8\\u1923-\\u1926\\u1929-\\u192B\\u1930\\u1931\\u1933-\\u1938\\u19B0-\\u19C0\\u19C8\\u19C9\\u1A19-\\u1A1B\\u1A55\\u1A57\\u1A61\\u1A63\\u1A64\\u1A6D-\\u1A72\\u1B04\\u1B35\\u1B3B\\u1B3D-\\u1B41\\u1B43\\u1B44\\u1B82\\u1BA1\\u1BA6\\u1BA7\\u1BAA\\u1C24-\\u1C2B\\u1C34\\u1C35\\u1CE1\\u1CF2\\uA823\\uA824\\uA827\\uA880\\uA881\\uA8B4-\\uA8C3\\uA952\\uA953\\uA983\\uA9B4\\uA9B5\\uA9BA\\uA9BB\\uA9BD-\\uA9C0\\uAA2F\\uAA30\\uAA33\\uAA34\\uAA4D\\uAA7B\\uABE3\\uABE4\\uABE6\\uABE7\\uABE9\\uABEA\\uABEC]"), connector_punctuation: new RegExp("[\\u005F\\u203F\\u2040\\u2054\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFF3F]")
};
function is_identifier_start(code) {return code == 36 || code == 95 || is_letter(code);}
function is_digit(code) {return code >= 48 && code <= 57;}
function is_unicode_combining_mark(ch) {return UNICODE.non_spacing_mark.test(ch) || UNICODE.space_combining_mark.test(ch);}
function is_unicode_connector_punctuation(ch) {return UNICODE.connector_punctuation.test(ch);}
function is_unicode_digit(code) {return UNICODE.digit.test(String.fromCharCode(code));}
function is_alphanumeric_char(code) {return is_digit(code) || is_letter(code);}
/** * 是否符合标识符字符 * 1.标识符起始符 $、_ * 2.数字 * 3.unicode字符 * * @param {char} ch */
function is_identifier_char( ch ){	var code = ch.charCodeAt(0);	return is_identifier_start(code) || is_digit(code) || code == 8204 // \u200c: zero-width non-joiner <ZWNJ> || code == 8205 // \u200d: zero-width joiner <ZWJ> (in my ECMA-262 PDF, this is also 200c) || is_unicode_combining_mark(ch) || is_unicode_connector_punctuation(ch) || is_unicode_digit(code);
}
function JS_Parse_Error(message, filename, line, col, pos) { this.message = message; this.filename = filename; this.line = line; this.col = col; this.pos = pos; this.stack = new Error().stack;
}
JS_Parse_Error.prototype.toString = function() { return this.message + " (line: " + this.line + ", col: " + this.col + ", pos: " + this.pos + ")" + "\n\n" + this.stack;
}
function js_error(message, filename, line, col, pos){	throw new JS_Parse_Error(message, filename, line, col, pos);
}
var EX_EOF = {};
function tokenizer($TEXT, filename, html5_comments, shebang){	var S = {	text: $TEXT,	filename: filename,	pos: 0,	tokpos: 0,	line: 1,	tokline: 0,	col: 0,	tokcol: 0,	newline_before: false,	regex_allowed: false,	comments_before: []	};	//--- 状态机函数 -------------------	//一瞥，查看一个字符	function peek(){return S.text.charAt(S.pos);}	/** * 获取下一个字符 *	@step	1)判断字符是否EOF * @step	2)判断字符是否在字符串中 * @step	3)按规则，修改`S`的 [pos|col|line] * * @param {Object} signal_eof eof开关 * @param {Boolean} in_string * * @return {String} ch 返回下一个字符 */	function next(signal_eof, in_string){	var ch = S.text.charAt(S.pos++);	if(signal_eof && !ch)throw EX_EOF;	//TODO: 行|段落 分隔符	if("\r\n\u2028\u2029".indexOf(ch) >= 0){	S.newline_before = S.newline_before || !in_string;	++S.line;	S.col = 0;	if(!in_string && ch == "\r" && peek() == "\n"){	//treat a \r\n sequence as a single \n	++S.pos;	ch = "\n";	}	}else{	++S.col;	}	return ch;	}	//查看当前位置是否指定字符	function looking_at(str){return S.text.substr(S.pos, str.length) == str;}	//跳过指定字符数字符	function forward(i){while(i-- > 0)next();}	//查找指定字符位置	function find(what, signal_eof) { var pos = S.text.indexOf(what, S.pos); if (signal_eof && pos == -1) throw EX_EOF; return pos; }	var prev_was_dot = false;	/** * token构造器 * * @param {Object} type * @param {Object} value * @param {Object} is_comment * * @return AST_Token */	function token(type, value, is_comment){	S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) || (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) || (type == "punc" && PUNC_BEFORE_EXPRESSION(value))); prev_was_dot = (type == "punc" && value == "."); var ret = { type : type, value : value, line : S.tokline, col : S.tokcol, pos : S.tokpos, endline : S.line, endcol : S.col, endpos : S.pos, nlb : S.newline_before, file : filename }; if (/^(?:num|string|regexp)$/i.test(type)) { ret.raw = $TEXT.substring(ret.pos, ret.endpos); } if (!is_comment) { ret.comments_before = S.comments_before; S.comments_before = []; // make note of any newlines in the comments that came before for (var i = 0, len = ret.comments_before.length; i < len; i++) { ret.nlb = ret.nlb || ret.comments_before[i].nlb; } } S.newline_before = false; return new AST_Token(ret);	}	//--- helper -------------------	//JS错误解析函数	function parse_error(err){	js_error(err, filename, S.tokline, S.tokcol, S.tokpos);	}	//闭包，传入eof_error，形成带错误信息处理函数	function with_eof_error(eof_error, cont){	return function(x){	try{	return cont(x);	}catch(ex){	if (ex === EX_EOF) parse_error(eof_error); else throw ex;	}	};	}	// 连续read，回调	function read_while(pred){	var ret = "", ch, i = 0;	while ((ch = peek()) && pred(ch, i++))	ret += next();	return ret;	}	//解析数值	function parse_js_number(num) { if (RE_HEX_NUMBER.test(num)) { return parseInt(num.substr(2), 16); } else if (RE_OCT_NUMBER.test(num)) { return parseInt(num.substr(1), 8); } else { var val = parseFloat(num); if (val == num) return val; }	}	//解析转义字符	function read_escaped_char(in_string){	var ch = next(true, in_string);	switch () {	case 110: return "\n";	case 114: return "\r";	case 116: return "\t";	case 98: return "\b";	case 118: return "\u000b"; // \v	case 102: return "\f";	case 48: return "\0";	case 120: return String.fromCharCode(hex_bytes(2)); // \x	case 117: return String.fromCharCode(hex_bytes(4)); // \u	case 10: return ""; // newline	case 13: // \r	if (peek() == "\n") { // DOS newline	next(true, in_string);	return "";	}	}	return ch;	}	//解析表达式	function read_name(){	var backslash = false, name = "", ch, escaped = false, hex;	while((ch = peek()) != null){	if(!backslash){	if(ch == "\\") escaped = backslash = true, next();	else if(is_identifier_char(ch)) name += next();	else break;	}else{	if(ch != "u") parse_error("Expecting UnicodeEscapeSequence -- uXXXX");	ch = read_escaped_char();	if (!is_identifier_char(ch)) parse_error("Unicode char: " + ch.charCodeAt(0) + " is not valid in identifier");	name += ch;	backslash = false	}	}	if( KEYWORDS(name) && escaped){	hex = name.charCodeAt(0).toString(16).toUpperCase();	name = "\\u" + "0000".substr(hex.length) + hex + name.slice(1);	}	return name;	}	//--- 具体解析方法 -------------------	//解析正则表达式	var read_regexp = with_eof_error("Unterminated regular expression", function(regexp){	var prev_backslash = false, ch, in_class = false;	while((ch = next(true))){	if(prev_backslash){//已出现过反斜线	regexp += "\\" + ch;	prev_backslash = false;	}else if(ch == "["){//是 [	in_class = true;	regexp += ch;	}else if (ch == "]" && in_class) {	in_class = false;	regexp += ch;	}else if (ch == "/" && !in_class) {//退出	break;	}else if (ch == "\\") {	prev_backslash = true;	}else{	regexp += ch;	}	}	var mods = read_name();	try{	return token("regexp", new RegExp(regexp, mods));	}catch(e){	parse_error(e.message);	}	});	//解析字符串	var read_string = with_eof_error("Unterminated string constant", function(quote_char){ var quote = next(), ret = ""; for (;;) { var ch = next(true, true); if (ch == "\\") { // read OctalEscapeSequence (XXX: deprecated if "strict mode") // https://github.com/mishoo/UglifyJS/issues/178 var octal_len = 0, first = null; ch = read_while(function(ch){ if (ch >= "0" && ch <= "7") { if (!first) { first = ch; return ++octal_len; } else if (first <= "3" && octal_len <= 2) return ++octal_len; else if (first >= "4" && octal_len <= 1) return ++octal_len; } return false; }); if (octal_len > 0) ch = String.fromCharCode(parseInt(ch, 8)); else ch = read_escaped_char(true); } else if (ch == quote) break; ret += ch; } var tok = token("string", ret); tok.quote = quote_char; return tok; });	//解析 .	function handle_dot(){	next();	return is_digit(peek().charCodeAt(0)) ? read_num(".") : token("punc", ".");	}	//解析 /	function handle_slash(){	next(); //吃掉 第一个 /	switch(peek()){	case "/":	next();	return skip_line_comment("comment1");	case "*":	next();	return skip_multiline_comment();	}	return S.regex_allowed ? read_regexp("") : read_operator("/");	}	//解析数字	function read_num(prefix) { var has_e = false, after_e = false, has_x = false, has_dot = prefix == "."; var num = read_while(function(ch, i){ var code = ch.charCodeAt(0); switch (code) { case 120: case 88: // xX return has_x ? false : (has_x = true); case 101: case 69: // eE return has_x ? true : has_e ? false : (has_e = after_e = true); case 45: // - return after_e || (i == 0 && !prefix); case 43: // + return after_e; case (after_e = false, 46): // . return (!has_dot && !has_x && !has_e) ? (has_dot = true) : false; } return is_alphanumeric_char(code); }); if (prefix) num = prefix + num; var valid = parse_js_number(num); if (!isNaN(valid)) { return token("num", valid); } else { parse_error("Invalid syntax: " + num); } }	//解析操作符	function read_operator(prefix) { function grow(op) { if (!peek()) return op; var bigger = op + peek(); if (OPERATORS(bigger)) { next(); return grow(bigger); } else { return op; } }; return token("operator", grow(prefix || next())); }	//解析 命名表达式	function read_word() { var word = read_name(); if (prev_was_dot) return token("name", word); return KEYWORDS_ATOM(word) ? token("atom", word) : !KEYWORDS(word) ? token("name", word) : OPERATORS(word) ? token("operator", word) : token("keyword", word); }	//--- 解析主流程 -------------------	//跳过空白	function skip_whitespace(){	var ch;	while (WHITESPACE_CHARS(ch = peek()) || ch == "\u2028" || ch == "\u2029"){	next();	}	}	//记录有效token起始位置，行|列|位置	function start_token(){	S.tokline = S.line; S.tokcol = S.col; S.tokpos = S.pos;	}	/** * 获取下一个 Token * @param {Object} force_regexp */	function next_token(force_regexp){	if(force_regexp != null)return read_regexp(force_regexp);	skip_whitespace();	start_token();	if (html5_comments) { if (looking_at("<!--")) { forward(4); return skip_line_comment("comment3"); } if (looking_at("-->") && S.newline_before) { forward(3); return skip_line_comment("comment4"); } }	var ch = peek();	if(!ch)return token("eof");	var code = ch.charCodeAt(0);	switch (code) {	case 34://"	case 39://'	return read_string(ch);	case 46://.	return handle_dot();	case 47:///	return handle_slash();	}	if (is_digit(code)) return read_num(); if (PUNC_CHARS(ch)) return token("punc", next()); if (OPERATOR_CHARS(ch)) return read_operator(); if (code == 92/** \ **/ || is_identifier_start(code)) return read_word();	if (shebang) { if (S.pos == 0 && looking_at("#!")) { forward(2); return skip_line_comment("comment5"); } }	parse_error("Unexpected character '" + ch + "'");	}	next_token.context = function(nc){	if(nc)S.nc = nc;	return S;	}	return next_token;
}
A Pen by Kevin - Script Codes
A Pen by Kevin - Script Codes
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Developer Kevin
Username chenming142
Uploaded August 28, 2022
Rating 3
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Views 30,360
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Kevin (chenming142) Script Codes
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NgTouchSpin
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Vue Transition
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