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s.replace(/[[\\]\\\\-]/g, '\\\\$&')\n// escape all regexp magic characters\nconst regexpEscape = (s: string) =>\n s.replace(/[-[\\]{}()*+?.,\\\\^$|#\\s]/g, '\\\\$&')\n\n// everything has already been escaped, we just have to join\nconst rangesToString = (ranges: string[]): string => ranges.join('')\n\nexport type ParseClassResult = [\n src: string,\n uFlag: boolean,\n consumed: number,\n hasMagic: boolean\n]\n\n// takes a glob string at a posix brace expression, and returns\n// an equivalent regular expression source, and boolean indicating\n// whether the /u flag needs to be applied, and the number of chars\n// consumed to parse the character class.\n// This also removes out of order ranges, and returns ($.) if the\n// entire class just no good.\nexport const parseClass = (\n glob: string,\n position: number\n): ParseClassResult => {\n const pos = position\n /* c8 ignore start */\n if (glob.charAt(pos) !== '[') {\n throw new Error('not in a brace expression')\n }\n /* c8 ignore stop */\n const ranges: string[] = []\n const negs: string[] = []\n\n let i = pos + 1\n let sawStart = false\n let uflag = false\n let escaping = false\n let negate = false\n let endPos = pos\n let rangeStart = ''\n WHILE: while (i < glob.length) {\n const c = glob.charAt(i)\n if ((c === '!' || c === '^') && i === pos + 1) {\n negate = true\n i++\n continue\n }\n\n if (c === ']' && sawStart && !escaping) {\n endPos = i + 1\n break\n }\n\n sawStart = true\n if (c === '\\\\') {\n if (!escaping) {\n escaping = true\n i++\n continue\n }\n // escaped \\ char, fall through and treat like normal char\n }\n if (c === '[' && !escaping) {\n // either a posix class, a collation equivalent, or just a [\n for (const [cls, [unip, u, neg]] of Object.entries(posixClasses)) {\n if (glob.startsWith(cls, i)) {\n // invalid, [a-[] is fine, but not [a-[:alpha]]\n if (rangeStart) {\n return ['$.', false, glob.length - pos, true]\n }\n i += cls.length\n if (neg) negs.push(unip)\n else ranges.push(unip)\n uflag = uflag || u\n continue WHILE\n }\n }\n }\n\n // now it's just a normal character, effectively\n escaping = false\n if (rangeStart) {\n // throw this range away if it's not valid, but others\n // can still match.\n if (c > rangeStart) {\n ranges.push(braceEscape(rangeStart) + '-' + braceEscape(c))\n } else if (c === rangeStart) {\n ranges.push(braceEscape(c))\n }\n rangeStart = ''\n i++\n continue\n }\n\n // now might be the start of a range.\n // can be either c-d or c-] or c<more...>] or c] at this point\n if (glob.startsWith('-]', i + 1)) {\n ranges.push(braceEscape(c + '-'))\n i += 2\n continue\n }\n if (glob.startsWith('-', i + 1)) {\n rangeStart = c\n i += 2\n continue\n }\n\n // not the start of a range, just a single character\n ranges.push(braceEscape(c))\n i++\n }\n\n if (endPos < i) {\n // didn't see the end of the class, not a valid class,\n // but might still be valid as a literal match.\n return ['', false, 0, false]\n }\n\n // if we got no ranges and no negates, then we have a range that\n // cannot possibly match anything, and that poisons the whole glob\n if (!ranges.length && !negs.length) {\n return ['$.', false, glob.length - pos, true]\n }\n\n // if we got one positive range, and it's a single character, then that's\n // not actually a magic pattern, it's just that one literal character.\n // we should not treat that as \"magic\", we should just return the literal\n // character. [_] is a perfectly valid way to escape glob magic chars.\n if (\n negs.length === 0 &&\n ranges.length === 1 &&\n /^\\\\?.$/.test(ranges[0]) &&\n !negate\n ) {\n const r = ranges[0].length === 2 ? ranges[0].slice(-1) : ranges[0]\n return [regexpEscape(r), false, endPos - pos, false]\n }\n\n const sranges = '[' + (negate ? '^' : '') + rangesToString(ranges) + ']'\n const snegs = '[' + (negate ? '' : '^') + rangesToString(negs) + ']'\n const comb =\n ranges.length && negs.length\n ? '(' + sranges + '|' + snegs + ')'\n : ranges.length\n ? sranges\n : snegs\n\n return [comb, uflag, endPos - pos, true]\n}\n"]} |