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{ balanced } from '@isaacs/balanced-match'\n\nconst escSlash = '\\0SLASH' + Math.random() + '\\0'\nconst escOpen = '\\0OPEN' + Math.random() + '\\0'\nconst escClose = '\\0CLOSE' + Math.random() + '\\0'\nconst escComma = '\\0COMMA' + Math.random() + '\\0'\nconst escPeriod = '\\0PERIOD' + Math.random() + '\\0'\nconst escSlashPattern = new RegExp(escSlash, 'g')\nconst escOpenPattern = new RegExp(escOpen, 'g')\nconst escClosePattern = new RegExp(escClose, 'g')\nconst escCommaPattern = new RegExp(escComma, 'g')\nconst escPeriodPattern = new RegExp(escPeriod, 'g')\nconst slashPattern = /\\\\\\\\/g\nconst openPattern = /\\\\{/g\nconst closePattern = /\\\\}/g\nconst commaPattern = /\\\\,/g\nconst periodPattern = /\\\\./g\n\nfunction numeric(str: string) {\n return !isNaN(str as any) ? parseInt(str, 10) : str.charCodeAt(0)\n}\n\nfunction escapeBraces(str: string) {\n return str\n .replace(slashPattern, escSlash)\n .replace(openPattern, escOpen)\n .replace(closePattern, escClose)\n .replace(commaPattern, escComma)\n .replace(periodPattern, escPeriod)\n}\n\nfunction unescapeBraces(str: string) {\n return str\n .replace(escSlashPattern, '\\\\')\n .replace(escOpenPattern, '{')\n .replace(escClosePattern, '}')\n .replace(escCommaPattern, ',')\n .replace(escPeriodPattern, '.')\n}\n\n/**\n * Basically just str.split(\",\"), but handling cases\n * where we have nested braced sections, which should be\n * treated as individual members, like {a,{b,c},d}\n */\nfunction parseCommaParts(str: string) {\n if (!str) {\n return ['']\n }\n\n const parts: string[] = []\n const m = balanced('{', '}', str)\n\n if (!m) {\n return str.split(',')\n }\n\n const { pre, body, post } = m\n const p = pre.split(',')\n\n p[p.length - 1] += '{' + body + '}'\n const postParts = parseCommaParts(post)\n if (post.length) {\n ;(p[p.length - 1] as string) += postParts.shift()\n p.push.apply(p, postParts)\n }\n\n parts.push.apply(parts, p)\n\n return parts\n}\n\nexport function expand(str: string) {\n if (!str) {\n return []\n }\n\n // I don't know why Bash 4.3 does this, but it does.\n // Anything starting with {} will have the first two bytes preserved\n // but *only* at the top level, so {},a}b will not expand to anything,\n // but a{},b}c will be expanded to [a}c,abc].\n // One could argue that this is a bug in Bash, but since the goal of\n // this module is to match Bash's rules, we escape a leading {}\n if (str.slice(0, 2) === '{}') {\n str = '\\\\{\\\\}' + str.slice(2)\n }\n\n return expand_(escapeBraces(str), true).map(unescapeBraces)\n}\n\nfunction embrace(str: string) {\n return '{' + str + '}'\n}\n\nfunction isPadded(el: string) {\n return /^-?0\\d/.test(el)\n}\n\nfunction lte(i: number, y: number) {\n return i <= y\n}\n\nfunction gte(i: number, y: number) {\n return i >= y\n}\n\nfunction expand_(str: string, isTop?: boolean): string[] {\n /** @type {string[]} */\n const expansions: string[] = []\n\n const m = balanced('{', '}', str)\n if (!m) return [str]\n\n // no need to expand pre, since it is guaranteed to be free of brace-sets\n const pre = m.pre\n const post: string[] = m.post.length ? expand_(m.post, false) : ['']\n\n if (/\\$$/.test(m.pre)) {\n for (let k = 0; k < post.length; k++) {\n const expansion = pre + '{' + m.body + '}' + post[k]\n expansions.push(expansion)\n }\n } else {\n const isNumericSequence = /^-?\\d+\\.\\.-?\\d+(?:\\.\\.-?\\d+)?$/.test(m.body)\n const isAlphaSequence = /^[a-zA-Z]\\.\\.[a-zA-Z](?:\\.\\.-?\\d+)?$/.test(m.body)\n const isSequence = isNumericSequence || isAlphaSequence\n const isOptions = m.body.indexOf(',') >= 0\n if (!isSequence && !isOptions) {\n // {a},b}\n if (m.post.match(/,(?!,).*\\}/)) {\n str = m.pre + '{' + m.body + escClose + m.post\n return expand_(str)\n }\n return [str]\n }\n\n let n: string[]\n if (isSequence) {\n n = m.body.split(/\\.\\./)\n } else {\n n = parseCommaParts(m.body)\n if (n.length === 1 && n[0] !== undefined) {\n // x{{a,b}}y ==> x{a}y x{b}y\n n = expand_(n[0], false).map(embrace)\n //XXX is this necessary? Can't seem to hit it in tests.\n /* c8 ignore start */\n if (n.length === 1) {\n return post.map(p => m.pre + n[0] + p)\n }\n /* c8 ignore stop */\n }\n }\n\n // at this point, n is the parts, and we know it's not a comma set\n // with a single entry.\n let N: string[]\n\n if (isSequence && n[0] !== undefined && n[1] !== undefined) {\n const x = numeric(n[0])\n const y = numeric(n[1])\n const width = Math.max(n[0].length, n[1].length)\n let incr =\n n.length === 3 && n[2] !== undefined ? Math.abs(numeric(n[2])) : 1\n let test = lte\n const reverse = y < x\n if (reverse) {\n incr *= -1\n test = gte\n }\n const pad = n.some(isPadded)\n\n N = []\n\n for (let i = x; test(i, y); i += incr) {\n let c\n if (isAlphaSequence) {\n c = String.fromCharCode(i)\n if (c === '\\\\') {\n c = ''\n }\n } else {\n c = String(i)\n if (pad) {\n const need = width - c.length\n if (need > 0) {\n const z = new Array(need + 1).join('0')\n if (i < 0) {\n c = '-' + z + c.slice(1)\n } else {\n c = z + c\n }\n }\n }\n }\n N.push(c)\n }\n } else {\n N = []\n\n for (let j = 0; j < n.length; j++) {\n N.push.apply(N, expand_(n[j] as string, false))\n }\n }\n\n for (let j = 0; j < N.length; j++) {\n for (let k = 0; k < post.length; k++) {\n const expansion = pre + N[j] + post[k]\n if (!isTop || isSequence || expansion) {\n expansions.push(expansion)\n }\n }\n }\n }\n\n return expansions\n}\n"]}
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