replaced Token with Lexeme protocol on TemplateSyntaxError

Sources/Node.swift

@@ -1,32 +1,5 @@
 import Foundation
 
-
-public struct TemplateSyntaxError : Error, Equatable, CustomStringConvertible {
-  public let description:String
-  public var token: Token?
-
-  public init(_ description:String) {
-    self.description = description
-  }
-  
-  public func contextAwareError(templateName: String?, templateContent: String) -> TemplateSyntaxError? {
-    guard let token = token, token.range != .unknown else { return nil }
-    let templateName = templateName.map({ "\($0):" }) ?? ""
-    let (line, lineNumber, offset) = templateContent.lineAndPosition(at: token.range)
-    let tokenContent = templateContent.substring(with: token.range)
-    let highlight = "\(String(Array(repeating: " ", count: offset)))^\(String(Array(repeating: "~", count: max(tokenContent.count - 1, 0))))"
-    let description = "\(templateName)\(lineNumber):\(offset): error: " + self.description + "\n\(line)\n\(highlight)\n"
-    return TemplateSyntaxError(description)
-  }
-  
-}
-
-
-public func ==(lhs:TemplateSyntaxError, rhs:TemplateSyntaxError) -> Bool {
-  return lhs.description == rhs.description
-}
-
-
 public protocol NodeType {
   /// Render the node in the given context
   func render(_ context:Context) throws -> String