1 files changed, 32 insertions, 0 deletions
diff --git a/Map/MapParser/Strategies/EdgeParserStrategy.swift b/Map/MapParser/Strategies/EdgeParserStrategy.swift
new file mode 100644
index 0000000..0df1ff4
--- /dev/null
+++ b/Map/MapParser/Strategies/EdgeParserStrategy.swift
@@ -0,0 +1,32 @@
+import Foundation
+
+struct EdgeParserStrategy: MapParserStrategy {
+  private let regex = MapParsingPatterns.edge
+
+  func canHandle(line: String) -> Bool {
+    let range = NSRange(location: 0, length: line.utf16.count)
+    let matches = regex.matches(in: String(line), options: [], range: range)
+    return matches.count > 0 && matches[0].numberOfRanges == 4
+  }
+
+  func handle(index: Int, line: String, vertices: [String: Vertex]) -> (Any.Type, Any) {
+    let range = NSRange(location: 0, length: line.utf16.count)
+    let matches = regex.matches(in: String(line), options: [], range: range)
+
+    let match = matches[0]
+    let arrowhead = String(line[Range(match.range(at: 2), in: line)!]) == ">"
+    let vertexA = String(line[Range(match.range(at: 1), in: line)!])
+    let vertexB = String(line[Range(match.range(at: 3), in: line)!])
+
+    if let origin = vertices[vertexA] {
+      if let destination = vertices[vertexB] {
+        let edge = MapEdge(
+          id: index, origin: origin.position, destination: destination.position,
+          arrowhead: arrowhead)
+        return (MapEdge.self, edge)
+      }
+    }
+
+    return (NSObject.self, NSObject())  // No matching object
+  }
+}