58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
const TR_CLASS = {
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'[:alnum:]':
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'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',
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'[:alpha:]': 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
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'[:blank:]': ' \t',
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'[:cntrl:]': [...Array(32).keys()].map((i) => String.fromCharCode(i)).join('') + '\x7f',
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'[:digit:]': '0123456789',
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'[:lower:]': 'abcdefghijklmnopqrstuvwxyz',
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'[:print:]': [...Array(95).keys()].map((i) => String.fromCharCode(i + 32)).join(''),
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'[:punct:]': '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~',
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'[:space:]': ' \t\n\r\v\f',
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'[:upper:]': 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
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'[:xdigit:]': '0123456789abcdefABCDEF'
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}
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/** @param {string} s */
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function trExpandClasses(s) {
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let out = s
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for (const [name, chars] of Object.entries(TR_CLASS)) {
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out = out.split(name).join(chars)
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}
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return out
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}
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async function run(ctx, argv) {
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let del = false
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const sets = []
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for (let i = 1; i < argv.length; i++) {
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if (argv[i] === '-d' || argv[i] === '--delete') del = true
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else if (argv[i] !== '--') sets.push(argv[i])
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}
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if (!sets.length || (!del && sets.length < 2)) {
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ctx.console.error('usage: tr [-d] SET1 [SET2]')
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ctx.exitCode = 1
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return
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}
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const s = bareStdin(ctx)
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if (del) {
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const kill = new Set(trExpandClasses(sets[0]).split(''))
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let o = ''
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for (const ch of s) if (!kill.has(ch)) o += ch
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ctx.console.log(o)
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return
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}
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const from = trExpandClasses(sets[0])
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const to = trExpandClasses(sets[1])
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const map = Object.create(null)
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const n = Math.max(from.length, to.length)
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for (let i = 0; i < n; i++) {
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const fc = from[i] || from[from.length - 1]
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const tc = to[i] != null ? to[i] : to[to.length - 1] || ''
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map[fc] = tc
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}
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let o = ''
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for (const ch of s) o += map[ch] != null ? map[ch] : ch
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ctx.console.log(o)
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}
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