git.r.bdr.sh - rbdr/map/blob - Map/Logic/MapParser/Strategies/GroupParserStrategy.swift

   1 // Copyright (C) 2024 Rubén Beltrán del Río
   2
   3 // This program is free software: you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License as published by
   5 // the Free Software Foundation, either version 3 of the License, or
   6 // (at your option) any later version.
   7
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program. If not, see https://map.tranquil.systems.
  15 import Foundation
  16
  17 struct GroupParserStrategy: MapParserStrategy {
  18   private let regex = MapParsingPatterns.group
  19
  20   func canHandle(line: String) -> Bool {
  21     let range = NSRange(location: 0, length: line.utf16.count)
  22     let matches = regex.matches(in: String(line), options: [], range: range)
  23     return matches.count > 0 && matches[0].numberOfRanges == 3
  24   }
  25
  26   func handle(index: Int, line: String, vertices: [String: Vertex]) -> (Any.Type, Any) {
  27     let range = NSRange(location: 0, length: line.utf16.count)
  28     let matches = regex.matches(in: String(line), options: [], range: range)
  29
  30     let match = matches[0]
  31     var groupVertices: [Vertex] = []
  32     let vertexIdString = String(line[Range(match.range(at: 2), in: line)!])
  33     let vertexIds = vertexIdString.split(separator: ",", omittingEmptySubsequences: true).map(
  34       String.init
  35     ).map({ vertexId in
  36       vertexId.trimmingCharacters(in: .whitespacesAndNewlines)
  37     })
  38
  39     for vertexId in vertexIds {
  40       if let vertex = vertices[vertexId] {
  41         groupVertices.append(vertex)
  42       }
  43     }
  44
  45     if groupVertices.count > 0 {
  46       return ([Vertex].self, groupVertices)
  47     }
  48
  49     return (NSObject.self, NSObject())
  50   }
  51 }