// Code generated by Speakeasy (https://speakeasyapi.dev). DO NOT EDIT.

import Foundation

enum StringSubstitutionError: Swift.Error {
    case `internal`
    case missingParameter(named: String, in: String)
}

extension String {
  typealias SubstitutionHandler = (_ key: String) throws -> String?

  func substituteComponents(using substitutionHandler: SubstitutionHandler) throws -> String {
      let regex = try NSRegularExpression(pattern: "\\{([^}]+)\\}")
      let range = NSRange(startIndex..<endIndex, in: self)
      let matches = regex.matches(in: self, range: range)

      var substitutedPath = self
      // Reverse matches so that we can replace substrings in place.
      for match in matches.reversed() {
          let templateRange = match.range
          guard let keyRange = Range(match.range(at: 1), in: self) else {
              throw StringSubstitutionError.internal
          }

          let key = String(self[keyRange])
          guard let serializedParameter = try substitutionHandler(key) else {
              throw StringSubstitutionError.missingParameter(named: key, in: self)
          }

          let startIndex = substitutedPath.index(substitutedPath.startIndex, offsetBy: templateRange.location)
          let endIndex = substitutedPath.index(startIndex, offsetBy: templateRange.length)
          substitutedPath.replaceSubrange(startIndex..<endIndex, with: serializedParameter)
      }
      return substitutedPath
  }
}