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module.exports = exports = abbrev.abbrev = abbrev
abbrev.monkeyPatch = monkeyPatch
function monkeyPatch () {
Array.prototype.abbrev = function () { return abbrev(this) }
Object.prototype.abbrev = function () { return abbrev(Object.keys(this)) }
}
function abbrev (list) {
if (arguments.length !== 1 || !Array.isArray(list)) {
list = Array.prototype.slice.call(arguments, 0)
}
for (var i = 0, l = list.length, args = [] ; i < l ; i ++) {
args[i] = typeof list[i] === "string" ? list[i] : String(list[i])
}
// sort them lexicographically, so that they're next to their nearest kin
args = args.sort(lexSort)
// walk through each, seeing how much it has in common with the next and previous
var abbrevs = {}
, prev = ""
for (var i = 0, l = args.length ; i < l ; i ++) {
var current = args[i]
, next = args[i + 1] || ""
, nextMatches = true
, prevMatches = true
if (current === next) continue
for (var j = 0, cl = current.length ; j < cl ; j ++) {
var curChar = current.charAt(j)
nextMatches = nextMatches && curChar === next.charAt(j)
prevMatches = prevMatches && curChar === prev.charAt(j)
if (nextMatches || prevMatches) continue
else {
j ++
break
}
}
prev = current
if (j === cl) {
abbrevs[current] = current
continue
}
for (var a = current.substr(0, j) ; j <= cl ; j ++) {
abbrevs[a] = current
a += current.charAt(j)
}
}
return abbrevs
}
function lexSort (a, b) {
return a === b ? 0 : a > b ? 1 : -1
}
// tests
if (module === require.main) {
var assert = require("assert")
, sys
sys = require("util")
console.log("running tests")
function test (list, expect) {
var actual = abbrev(list)
assert.deepEqual(actual, expect,
"abbrev("+sys.inspect(list)+") === " + sys.inspect(expect) + "\n"+
"actual: "+sys.inspect(actual))
actual = abbrev.apply(exports, list)
assert.deepEqual(abbrev.apply(exports, list), expect,
"abbrev("+list.map(JSON.stringify).join(",")+") === " + sys.inspect(expect) + "\n"+
"actual: "+sys.inspect(actual))
}
test([ "ruby", "ruby", "rules", "rules", "rules" ],
{ rub: 'ruby'
, ruby: 'ruby'
, rul: 'rules'
, rule: 'rules'
, rules: 'rules'
})
test(["fool", "foom", "pool", "pope"],
{ fool: 'fool'
, foom: 'foom'
, poo: 'pool'
, pool: 'pool'
, pop: 'pope'
, pope: 'pope'
})
test(["a", "ab", "abc", "abcd", "abcde", "acde"],
{ a: 'a'
, ab: 'ab'
, abc: 'abc'
, abcd: 'abcd'
, abcde: 'abcde'
, ac: 'acde'
, acd: 'acde'
, acde: 'acde'
})
console.log("pass")
}
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