Fix Formatted parser (#301)

* Fix `Formatted` parser It should only consume the match range. * wip
pointfreeco · May 26, 2023 · 27c941b · 27c941b
1 parent 01ded17
commit 27c941b
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/Sources/Parsing/ParserPrinters/ParseableFormatStyle.swift b/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
     }
 

diff --git a/Tests/ParsingTests/ParseableFormatTests.swift b/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