Fix Formatted parser (#301)

* Fix `Formatted` parser It should only consume the match range. * wip

Author: stephencelis

Sources/Parsing/ParserPrinters/ParseableFormatStyle.swift

@@ -24,7 +24,7 @@
  at: input
  )
  }
- input.removeFirst(input.distance(from: input.startIndex, to: input.endIndex))
+ input.removeFirst(input.distance(from: match.range.lowerBound, to: match.range.upperBound))
  return match.output
  }
 

Tests/ParsingTests/ParseableFormatTests.swift

@@ -19,5 +19,15 @@
  "TOTAL: $42.42"
  )
  }
+
+ func testFormatted_PartiallyConsumes() throws {
+ var input = "COORD: 12.34°N"[...]
+ let p = Parse {
+ "COORD: "
+ Formatted(.number)
+ }
+ XCTAssertEqual(12.34, try p.parse(&input))
+ XCTAssertEqual(String(input), "°N")
+ }
  }
 #endif