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61 lines
1.7 KiB
61 lines
1.7 KiB
module.exports = exports = abbrev.abbrev = abbrev |
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abbrev.monkeyPatch = monkeyPatch |
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function monkeyPatch () { |
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Object.defineProperty(Array.prototype, 'abbrev', { |
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value: function () { return abbrev(this) }, |
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enumerable: false, configurable: true, writable: true |
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}) |
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Object.defineProperty(Object.prototype, 'abbrev', { |
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value: function () { return abbrev(Object.keys(this)) }, |
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enumerable: false, configurable: true, writable: true |
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}) |
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} |
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function abbrev (list) { |
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if (arguments.length !== 1 || !Array.isArray(list)) { |
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list = Array.prototype.slice.call(arguments, 0) |
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} |
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for (var i = 0, l = list.length, args = [] ; i < l ; i ++) { |
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args[i] = typeof list[i] === "string" ? list[i] : String(list[i]) |
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} |
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// sort them lexicographically, so that they're next to their nearest kin |
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args = args.sort(lexSort) |
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// walk through each, seeing how much it has in common with the next and previous |
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var abbrevs = {} |
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, prev = "" |
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for (var i = 0, l = args.length ; i < l ; i ++) { |
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var current = args[i] |
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, next = args[i + 1] || "" |
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, nextMatches = true |
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, prevMatches = true |
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if (current === next) continue |
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for (var j = 0, cl = current.length ; j < cl ; j ++) { |
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var curChar = current.charAt(j) |
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nextMatches = nextMatches && curChar === next.charAt(j) |
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prevMatches = prevMatches && curChar === prev.charAt(j) |
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if (!nextMatches && !prevMatches) { |
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j ++ |
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break |
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} |
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} |
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prev = current |
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if (j === cl) { |
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abbrevs[current] = current |
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continue |
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} |
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for (var a = current.substr(0, j) ; j <= cl ; j ++) { |
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abbrevs[a] = current |
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a += current.charAt(j) |
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} |
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} |
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return abbrevs |
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} |
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function lexSort (a, b) { |
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return a === b ? 0 : a > b ? 1 : -1 |
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}
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