Brace expansion: Difference between revisions

=={{header|Kotlin}}==

{{trans|Java}}

<lang scala>// version 1.1.1

object BraceExpansion {

fun expand(s: String) = expandR("", s, "")

private val r = Regex("""([\\]{2}|[\\][,}{])""")

private fun expandR(pre: String, s: String, suf: String) {

val noEscape = s.replace(r, " ")

var sb = StringBuilder("")

var i1 = noEscape.indexOf('{')

var i2 = 0

outer@ while (i1 != -1) {

sb = StringBuilder(s)

var depth = 1

i2 = i1 + 1

while (i2 < s.length && depth > 0) {

val c = noEscape[i2]

if (c == '{')

depth++

else if (c == '}')

depth--

if (c == ',' && depth == 1)

sb[i2] = '\u0000'

else if (c == '}' && depth == 0 && sb.indexOf("\u0000") != -1)

break@outer

i2++

}

i1 = noEscape.indexOf('{', i1 + 1)

}

if (i1 == -1) {

if (suf.length > 0)

expandR(pre + s, suf, "")

else

println("$pre$s$suf")

}

else {

for (m in sb.substring(i1 + 1, i2).split('\u0000'))

expandR(pre + s.substring(0, i1), m, s.substring(i2 + 1) + suf)

}

}

}

fun main(args: Array<String>) {

val strings = arrayOf(

"""~/{Downloads,Pictures}/*.{jpg,gif,png}""",

"""It{{em,alic}iz,erat}e{d,}, please.""",

"""{,{,gotta have{ ,\, again\, }}more }cowbell!""",

"""{}} some }{,{\\{ edge, edge} \,}{ cases, {here} \\\\\}"""

)

for (s in strings) {

println()

BraceExpansion.expand(s)

}

}</lang>

{{out}}

<pre>

~/Downloads/*.jpg

~/Downloads/*.gif

~/Downloads/*.png

~/Pictures/*.jpg

~/Pictures/*.gif

~/Pictures/*.png

Itemized, please.

Itemize, please.

Italicized, please.

Italicize, please.

Iterated, please.

Iterate, please.

cowbell!

more cowbell!

gotta have more cowbell!

gotta have\, again\, more cowbell!

{}} some }{,{\\ edge \,}{ cases, {here} \\\\\}

{}} some }{,{\\ edge \,}{ cases, {here} \\\\\}

</pre>