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

   1 /*
   2  Copyright (C) 2024 Rubén Beltrán del Río
   3
   4  This program is free software: you can redistribute it and/or modify
   5  it under the terms of the GNU General Public License as published by
   6  the Free Software Foundation, either version 3 of the License, or
   7  (at your option) any later version.
   8
   9  This program is distributed in the hope that it will be useful,
  10  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  GNU General Public License for more details.
  13
  14  You should have received a copy of the GNU General Public License
  15  along with this program. If not, see https://map.tranquil.systems.
  16  */
  17 import Foundation
  18
  19 struct EdgeParserStrategy: MapParserStrategy {
  20   private let regex = MapParsingPatterns.edge
  21
  22   func canHandle(line: String) -> Bool {
  23     let range = NSRange(location: 0, length: line.utf16.count)
  24     let matches = regex.matches(in: String(line), options: [], range: range)
  25     return matches.count > 0 && matches[0].numberOfRanges == 4
  26   }
  27
  28   func handle(index: Int, line: String, vertices: [String: Vertex]) -> (Any.Type, Any) {
  29     let range = NSRange(location: 0, length: line.utf16.count)
  30     let matches = regex.matches(in: String(line), options: [], range: range)
  31
  32     let match = matches[0]
  33     let arrowhead = String(line[Range(match.range(at: 2), in: line)!]) == ">"
  34     let vertexA = String(line[Range(match.range(at: 1), in: line)!])
  35     let vertexB = String(line[Range(match.range(at: 3), in: line)!])
  36
  37     if let origin = vertices[vertexA] {
  38       if let destination = vertices[vertexB] {
  39         let edge = MapEdge(
  40           id: index, origin: origin.position, destination: destination.position,
  41           arrowhead: arrowhead)
  42         return (MapEdge.self, edge)
  43       }
  44     }
  45
  46     return (NSObject.self, NSObject())  // No matching object
  47   }
  48 }