Skip to content

Instantly share code, notes, and snippets.

@sstadelman
Created November 19, 2019 21:32
Show Gist options
  • Save sstadelman/11bd7141222dbcf3942f343b756b24bc to your computer and use it in GitHub Desktop.
Save sstadelman/11bd7141222dbcf3942f343b756b24bc to your computer and use it in GitHub Desktop.
Matcher to find mustache placeholder keys and replacement ranges
extension Array where Element == NSRange {
func maxRange() -> Int {
return self.reduce(0) { (prev, next) in
let maxNext = NSMaxRange(next)
return Swift.max(prev, maxNext)
}
}
}
extension String {
private static let mustacheRegex = try! NSRegularExpression(pattern: #"\{\{?(?<mustache>(#[a-z])?[a-z]+.[a-z])*\}?\}"#, options: [])
private static let mustacheKeyname = "mustache"
func mustachePlaceholders() -> [(String, NSRange)] {
var shouldStop = false
var placeholders: [(keyname: String, replacementRange: NSRange)] = []
var counterIndex: Int = 0
while !shouldStop {
guard counterIndex < self.count else { shouldStop = true; break }
if let match = String.mustacheRegex.firstMatch(in: self, options: [], range: NSRange(counterIndex..<self.count)) {
let range = match.range(withName: String.mustacheKeyname)
if range.location != NSNotFound {
placeholders.append((keyname: NSString(string: self).substring(with: range), replacementRange: match.range))
}
} else { shouldStop = true; break }
counterIndex = placeholders.map({ $0.replacementRange }).maxRange() + 1
}
return placeholders
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment