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HTML escape matching & sorting quizzes (#492)
* Remove unused * Add String+HTMLEscape * Add HTML-escaping for MatchingQuizViewController * Remove unused * Add HTML-escaping for SortingQuizViewController
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| import Foundation | ||
|
|
||
| extension String { | ||
| private static let requiredEscapes: Set<Character> = ["<", ">"] | ||
| private static let escapeMap: [Character: String] = [ | ||
| "<": "lt", | ||
| ">": "gt" | ||
| ] | ||
|
|
||
| func addingHTMLEntities() -> String { | ||
| var copy = self | ||
| copy.addHTMLEntities() | ||
| return copy | ||
| } | ||
|
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| mutating func addHTMLEntities() { | ||
| var position: String.Index? = self.startIndex | ||
|
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| while let cursorPosition = position { | ||
| guard cursorPosition != self.endIndex else { | ||
| break | ||
| } | ||
|
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| let character = self[cursorPosition] | ||
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| if String.requiredEscapes.contains(character), let entity = String.escapeMap[character] { | ||
| let escape = "&\(entity);" | ||
| position = self.positionAfterReplacingCharacter(at: cursorPosition, with: escape) | ||
| } else { | ||
| position = self.index(cursorPosition, offsetBy: 1, limitedBy: self.endIndex) | ||
| } | ||
| } | ||
| } | ||
|
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| /// Replaces the character at the given position with the escape and returns the new position. | ||
| private mutating func positionAfterReplacingCharacter( | ||
| at position: String.Index, | ||
| with escape: String | ||
| ) -> String.Index? { | ||
| let nextIndex = self.index(position, offsetBy: 1) | ||
|
|
||
| if let fittingPosition = self.index(position, offsetBy: escape.count, limitedBy: self.endIndex) { | ||
| // Check if we can fit the whole escape in the receiver | ||
| self.replaceSubrange(position..<nextIndex, with: escape) | ||
| return fittingPosition | ||
| } else { | ||
| // If we can't, remove the character and insert the escape to make it fit. | ||
| self.remove(at: position) | ||
| self.insert(contentsOf: escape, at: position) | ||
| return self.index(position, offsetBy: escape.count, limitedBy: self.endIndex) | ||
| } | ||
| } | ||
| } |