fix: escape paths on JSONPointer

Author: kylef

Sources/JSONPointer.swift

@@ -17,7 +17,13 @@ struct JSONPointer {
   }
 
   var path: String {
-    return components.joined(separator: "/")
+    return components
+      .map {
+        $0
+          .replacingOccurrences(of: "~", with: "~0")
+          .replacingOccurrences(of: "/", with: "~1")
+      }
+      .joined(separator: "/")
   }
 
   func resolve(document: Any) -> Any? {

Tests/JSONSchemaTests/JSONPointerTests.swift

@@ -115,4 +115,16 @@ class JSONPointerTests: XCTestCase {
 
     XCTAssertNil(pointer.resolve(document: document))
   }
+
+  // MARK: - #path
+
+  func testPath() {
+    let pointer = JSONPointer(path: "/foo")
+    XCTAssertEqual(pointer.path, "/foo")
+  }
+
+  func testPathWithSlash() {
+    let pointer = JSONPointer(path: "/a~1b")
+    XCTAssertEqual(pointer.path, "/a~1b")
+  }
 }