Commitce77879

Boudhayan Biswas

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Add encode decode strings

1 parent1b1cd4d commitce77879Copy full SHA for ce77879

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+30

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Lines changed: 30 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,30 @@`
	`1`	`+`
	`2`	`+classCodec{`
	`3`	`+func encode(_ strs:[String])->String{`
	`4`	`+if strs.isEmpty{return"#"}`
	`5`	`+varcounts=[String]()`
	`6`	`+forstrin strs{`
	`7`	`+ counts.append("\(str.count)")`
	`8`	`+}`
	`9`	`+return counts.joined(separator:",")+"#"+ strs.joined()`
	`10`	`+}`
	`11`	`+`
	`12`	`+func decode(_ s:String)->[String]{`
	`13`	`+if s=="#"{return[]}`
	`14`	`+letindex= s.firstIndex(of:"#")!`
	`15`	`+letcounts=String(s[s.startIndex...s.index(before: index)]).components(separatedBy:",")`
	`16`	`+varsIndex= s.index(after: index)`
	`17`	`+vardecodedStrings=[String]()`
	`18`	`+forcountin counts{`
	`19`	`+letendIndex= s.index(sIndex, offsetBy:Int(count)!-1)`
	`20`	`+if sIndex> endIndex{`
	`21`	`+ decodedStrings.append("")`
	`22`	`+continue`
	`23`	`+}`
	`24`	`+ decodedStrings.append(String(s[sIndex...endIndex]))`
	`25`	`+ sIndex= s.index(after: endIndex)`
	`26`	`+}`
	`27`	`+return decodedStrings`
	`28`	`+`
	`29`	`+}`
	`30`	`+}`

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