fix(#262): ignore the CRLF immediately following a multiple basic string opening

Fix #262

Signed-off-by: Frost Ming <[email protected]>

Author: frostming

tests/test_parser.py

@@ -39,3 +39,13 @@ def test_parser_should_raise_an_error_if_equal_not_found():
     parser = Parser(content)
     with pytest.raises(UnexpectedCharError):
         parser.parse()
+
+
+def test_parse_multiline_string_ignore_the_first_newline():
+    content = 'a = """\nfoo\n"""'
+    parser = Parser(content)
+    assert parser.parse() == {"a": "foo\n"}
+
+    content = 'a = """\r\nfoo\n"""'
+    parser = Parser(content)
+    assert parser.parse() == {"a": "foo\n"}

tomlkit/parser.py

@@ -799,9 +799,17 @@ def _parse_string(self, delim: StringType) -> String:
         value = ""
 
         # A newline immediately following the opening delimiter will be trimmed.
-        if delim.is_multiline() and self._current == "\n":
-            # consume the newline, EOF here is an issue (middle of string)
-            self.inc(exception=UnexpectedEofError)
+        if delim.is_multiline():
+            if self._current == "\n":
+                # consume the newline, EOF here is an issue (middle of string)
+                self.inc(exception=UnexpectedEofError)
+            else:
+                cur = self._current
+                with self._state(restore=True):
+                    if self.inc():
+                        cur += self._current
+                if cur == "\r\n":
+                    self.inc_n(2, exception=UnexpectedEofError)
 
         escaped = False  # whether the previous key was ESCAPE
         while True: