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[rbdr/map] / Map / Logic / MapParser / Strategies / EdgeParserStrategy.swift
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be897af3 1// Copyright (C) 2024 Rubén Beltrán del Río
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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.
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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.
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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.
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15import Foundation
16
17struct EdgeParserStrategy: MapParserStrategy {
18 private let regex = MapParsingPatterns.edge
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 == 4
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 let arrowhead = String(line[Range(match.range(at: 2), in: line)!]) == ">"
32 let vertexA = String(line[Range(match.range(at: 1), in: line)!])
33 let vertexB = String(line[Range(match.range(at: 3), in: line)!])
34
35 if let origin = vertices[vertexA] {
36 if let destination = vertices[vertexB] {
37 let edge = MapEdge(
38 id: index, origin: origin.position, destination: destination.position,
39 arrowhead: arrowhead)
40 return (MapEdge.self, edge)
41 }
42 }
43
44 return (NSObject.self, NSObject()) // No matching object
45 }
46}