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109 lines
2.4 KiB
109 lines
2.4 KiB
4 years ago
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const types = require('./types');
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const sets = require('./sets');
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const CTRL = '@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ ?';
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const SLSH = { '0': 0, 't': 9, 'n': 10, 'v': 11, 'f': 12, 'r': 13 };
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/**
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* Finds character representations in str and convert all to
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* their respective characters
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*
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* @param {String} str
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* @return {String}
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*/
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exports.strToChars = function(str) {
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/* jshint maxlen: false */
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var chars_regex = /(\[\\b\])|(\\)?\\(?:u([A-F0-9]{4})|x([A-F0-9]{2})|(0?[0-7]{2})|c([@A-Z[\\\]^?])|([0tnvfr]))/g;
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str = str.replace(chars_regex, function(s, b, lbs, a16, b16, c8, dctrl, eslsh) {
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if (lbs) {
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return s;
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}
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var code = b ? 8 :
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a16 ? parseInt(a16, 16) :
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b16 ? parseInt(b16, 16) :
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c8 ? parseInt(c8, 8) :
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dctrl ? CTRL.indexOf(dctrl) :
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SLSH[eslsh];
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var c = String.fromCharCode(code);
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// Escape special regex characters.
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if (/[[\]{}^$.|?*+()]/.test(c)) {
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c = '\\' + c;
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}
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return c;
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});
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return str;
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};
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/**
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* turns class into tokens
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* reads str until it encounters a ] not preceeded by a \
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*
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* @param {String} str
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* @param {String} regexpStr
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* @return {Array.<Array.<Object>, Number>}
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*/
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exports.tokenizeClass = (str, regexpStr) => {
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/* jshint maxlen: false */
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var tokens = [];
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var regexp = /\\(?:(w)|(d)|(s)|(W)|(D)|(S))|((?:(?:\\)(.)|([^\]\\]))-(?:\\)?([^\]]))|(\])|(?:\\)?([^])/g;
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var rs, c;
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while ((rs = regexp.exec(str)) != null) {
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if (rs[1]) {
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tokens.push(sets.words());
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} else if (rs[2]) {
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tokens.push(sets.ints());
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} else if (rs[3]) {
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tokens.push(sets.whitespace());
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} else if (rs[4]) {
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tokens.push(sets.notWords());
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} else if (rs[5]) {
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tokens.push(sets.notInts());
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} else if (rs[6]) {
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tokens.push(sets.notWhitespace());
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} else if (rs[7]) {
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tokens.push({
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type: types.RANGE,
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from: (rs[8] || rs[9]).charCodeAt(0),
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to: rs[10].charCodeAt(0),
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});
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} else if ((c = rs[12])) {
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tokens.push({
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type: types.CHAR,
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value: c.charCodeAt(0),
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});
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} else {
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return [tokens, regexp.lastIndex];
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}
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}
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exports.error(regexpStr, 'Unterminated character class');
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};
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/**
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* Shortcut to throw errors.
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*
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* @param {String} regexp
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* @param {String} msg
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*/
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exports.error = (regexp, msg) => {
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throw new SyntaxError('Invalid regular expression: /' + regexp + '/: ' + msg);
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};
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