Strip surrounding whitespace before parsing (#44)

docs/changes.rst

@@ -21,6 +21,8 @@ v0.3.0 (UNRELEASED)
   with both amounts payable and currency. This field is only set if the
   optional dependency ``py-moneyed`` is installed.
 
+- Strip surrounding whitespace before parsing.
+
 :mod:`biip.gtin`
 
 - Detect Restricted Circulation Numbers (RCN) and return a subclass of
@@ -38,6 +40,8 @@ v0.3.0 (UNRELEASED)
 
 - Add RCN rules for the Baltics, Great Britain, Norway, and Sweden.
 
+- Strip surrounding whitespace before parsing.
+
 - Bug fix: Keep all leading zeros in GTIN-8.
 
 - Bug fix: Convert GTIN-8 to GTIN-12 before extracting GS1 Prefix.

src/biip/gs1/_messages.py

@@ -57,6 +57,7 @@ def parse(
         Raises:
             ParseError: If a fixed-length field ends with a separator character.
         """
+        value = value.strip()
         element_strings = []
         rest = value[:]
 

src/biip/gtin/_gtin.py

@@ -66,6 +66,8 @@ def parse(
         """
         from biip.gtin import Rcn
 
+        value = value.strip()
+
         if len(value) not in (8, 12, 13, 14):
             raise ParseError(
                 f"Failed parsing {value!r} as GTIN: "

tests/gs1/test_messages.py

@@ -183,6 +183,12 @@ def test_parse_fails_if_fixed_length_field_ends_with_separator_char() -> None:
     )
 
 
+def test_parse_strips_surrounding_whitespace() -> None:
+    message = GS1Message.parse("  \t 800370713240010220085952 \n  ")
+
+    assert message.value == "800370713240010220085952"
+
+
 @pytest.mark.parametrize(
     "value, expected",
     [

tests/gtin/test_parse.py

@@ -37,6 +37,12 @@ def test_parse_gtin_13_with_invalid_check_digit() -> None:
     )
 
 
+def test_parse_strips_surrounding_whitespace() -> None:
+    gtin = Gtin.parse("  \t 5901234123457 \n  ")
+
+    assert gtin.value == "5901234123457"
+
+
 @pytest.mark.parametrize(
     "value",
     [