You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
2.4 KiB
109 lines
2.4 KiB
3 years ago
|
const types = require('./types');
|
||
|
|
const sets = require('./sets');
|
||
|
|
|
||
|
|
|
||
|
|
const CTRL = '@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ ?';
|
||
|
|
const SLSH = { '0': 0, 't': 9, 'n': 10, 'v': 11, 'f': 12, 'r': 13 };
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Finds character representations in str and convert all to
|
||
|
|
* their respective characters
|
||
|
|
*
|
||
|
|
* @param {String} str
|
||
|
|
* @return {String}
|
||
|
|
*/
|
||
|
|
exports.strToChars = function(str) {
|
||
|
|
/* jshint maxlen: false */
|
||
|
|
var chars_regex = /(\[\\b\])|(\\)?\\(?:u([A-F0-9]{4})|x([A-F0-9]{2})|(0?[0-7]{2})|c([@A-Z[\\\]^?])|([0tnvfr]))/g;
|
||
|
|
str = str.replace(chars_regex, function(s, b, lbs, a16, b16, c8, dctrl, eslsh) {
|
||
|
|
if (lbs) {
|
||
|
|
return s;
|
||
|
|
}
|
||
|
|
|
||
|
|
var code = b ? 8 :
|
||
|
|
a16 ? parseInt(a16, 16) :
|
||
|
|
b16 ? parseInt(b16, 16) :
|
||
|
|
c8 ? parseInt(c8, 8) :
|
||
|
|
dctrl ? CTRL.indexOf(dctrl) :
|
||
|
|
SLSH[eslsh];
|
||
|
|
|
||
|
|
var c = String.fromCharCode(code);
|
||
|
|
|
||
|
|
// Escape special regex characters.
|
||
|
|
if (/[[\]{}^$.|?*+()]/.test(c)) {
|
||
|
|
c = '\\' + c;
|
||
|
|
}
|
||
|
|
|
||
|
|
return c;
|
||
|
|
});
|
||
|
|
|
||
|
|
return str;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* turns class into tokens
|
||
|
|
* reads str until it encounters a ] not preceeded by a \
|
||
|
|
*
|
||
|
|
* @param {String} str
|
||
|
|
* @param {String} regexpStr
|
||
|
|
* @return {Array.<Array.<Object>, Number>}
|
||
|
|
*/
|
||
|
|
exports.tokenizeClass = (str, regexpStr) => {
|
||
|
|
/* jshint maxlen: false */
|
||
|
|
var tokens = [];
|
||
|
|
var regexp = /\\(?:(w)|(d)|(s)|(W)|(D)|(S))|((?:(?:\\)(.)|([^\]\\]))-(?:\\)?([^\]]))|(\])|(?:\\)?([^])/g;
|
||
|
|
var rs, c;
|
||
|
|
|
||
|
|
|
||
|
|
while ((rs = regexp.exec(str)) != null) {
|
||
|
|
if (rs[1]) {
|
||
|
|
tokens.push(sets.words());
|
||
|
|
|
||
|
|
} else if (rs[2]) {
|
||
|
|
tokens.push(sets.ints());
|
||
|
|
|
||
|
|
} else if (rs[3]) {
|
||
|
|
tokens.push(sets.whitespace());
|
||
|
|
|
||
|
|
} else if (rs[4]) {
|
||
|
|
tokens.push(sets.notWords());
|
||
|
|
|
||
|
|
} else if (rs[5]) {
|
||
|
|
tokens.push(sets.notInts());
|
||
|
|
|
||
|
|
} else if (rs[6]) {
|
||
|
|
tokens.push(sets.notWhitespace());
|
||
|
|
|
||
|
|
} else if (rs[7]) {
|
||
|
|
tokens.push({
|
||
|
|
type: types.RANGE,
|
||
|
|
from: (rs[8] || rs[9]).charCodeAt(0),
|
||
|
|
to: rs[10].charCodeAt(0),
|
||
|
|
});
|
||
|
|
|
||
|
|
} else if ((c = rs[12])) {
|
||
|
|
tokens.push({
|
||
|
|
type: types.CHAR,
|
||
|
|
value: c.charCodeAt(0),
|
||
|
|
});
|
||
|
|
|
||
|
|
} else {
|
||
|
|
return [tokens, regexp.lastIndex];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
exports.error(regexpStr, 'Unterminated character class');
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Shortcut to throw errors.
|
||
|
|
*
|
||
|
|
* @param {String} regexp
|
||
|
|
* @param {String} msg
|
||
|
|
*/
|
||
|
|
exports.error = (regexp, msg) => {
|
||
|
|
throw new SyntaxError('Invalid regular expression: /' + regexp + '/: ' + msg);
|
||
|
|
};
|