[#40] Support for verifying TEX address charset

closes #40

Sources/zcash-swift-payment-uri/Parser.swift

@@ -99,9 +99,6 @@ enum Parser {
         "="
         CharacterSet.qchar.eraseToAnyParser()
     }
-
-    /// Parser that reads any character included in the Base58 charset.
-    static let transparentEncodingCharsetParser = CharacterSet.base58.eraseToAnyParser()
 
     /// Parser that splits a sapling address human readable and Bech32 parts and verifies that
     /// HRP is any of the accepted networks (main, test, regtest) and that the supposedly Bech32
@@ -127,6 +124,21 @@ enum Parser {
         CharacterSet.bech32.eraseToAnyParser()
     }
 
+    static let texEncodingCharsetParser = Parse {
+        OneOf {
+            "tex1"
+            "textest1"
+        }
+        CharacterSet.bech32.eraseToAnyParser()
+    }
+
+    static let transparentEncodingCharsetParser = Parse {
+        OneOf {
+            texEncodingCharsetParser
+            CharacterSet.base58.eraseToAnyParser()
+        }
+    }
+
     /// maps a parsed Query Parameter key and value into an `IndexedParameter`
     /// providing validation of Query keys and values. An address validation can be provided.
     static func zcashParameter(
@@ -408,7 +420,7 @@ extension Parser {
         case "u":
             return (try? Parser.unifiedEncodingCharsetParser.parse(address)) != nil
         case "t":
-            return (try? CharacterSet.base58.eraseToAnyParser().parse(address)) != nil
+            return (try? Parser.transparentEncodingCharsetParser.parse(address)) != nil
         default:
             return false
         }

Tests/zcash-swift-payment-uriTests/ParsingTests.swift

@@ -944,5 +944,11 @@ final class ParsingTests: XCTestCase {
             }
         }
     }
+
+    func testThatTEXAddressCharsetIsValidated() throws {
+        let tex = "tex1s2rt77ggv6q989lr49rkgzmh5slsksa9khdgte"
+
+        XCTAssertNotNil(RecipientAddress(value: tex, validating: Parser.onlyCharsetValidation))
+    }
 }