Lexer: fix line & column for multiline BLOCK_STRING tokens

Replicates graphql/graphql-js@b262418

Author: Cito

src/graphql/language/lexer.py

@@ -380,6 +380,9 @@ def read_block_string(self, start: int) -> Token:
         """Read a block string token from the source file."""
         body = self.source.body
         body_length = len(body)
+        start_line = self.line
+        start_column = 1 + start - self.line_start
+
         position = start + 3
         chunk_start = position
         raw_value = []
@@ -389,10 +392,12 @@ def read_block_string(self, start: int) -> Token:
 
             if char == '"' and body[position + 1 : position + 3] == '""':
                 raw_value.append(body[chunk_start:position])
-                return self.create_token(
+                return Token(
                     TokenKind.BLOCK_STRING,
                     start,
                     position + 3,
+                    start_line,
+                    start_column,
                     dedent_block_string_value("".join(raw_value)),
                 )
 

tests/language/test_lexer.py

@@ -353,10 +353,10 @@ def lexes_block_strings():
             TokenKind.BLOCK_STRING, 0, 32, 1, 1, 'contains """ triple-quote'
         )
         assert lex_one('"""multi\nline"""') == Token(
-            TokenKind.BLOCK_STRING, 0, 16, 2, -8, "multi\nline"
+            TokenKind.BLOCK_STRING, 0, 16, 1, 1, "multi\nline"
         )
         assert lex_one('"""multi\rline\r\nnormalized"""') == Token(
-            TokenKind.BLOCK_STRING, 0, 28, 3, -14, "multi\nline\nnormalized"
+            TokenKind.BLOCK_STRING, 0, 28, 1, 1, "multi\nline\nnormalized"
         )
         assert lex_one('"""unescaped \\n\\r\\b\\t\\f\\u1234"""') == Token(
             TokenKind.BLOCK_STRING,
@@ -388,9 +388,7 @@ def lexes_block_strings():
         assert lex_one(
             '"""\n\n        spans\n          multiple\n'
             '            lines\n\n        """'
-        ) == Token(
-            TokenKind.BLOCK_STRING, 0, 68, 7, -56, "spans\n  multiple\n    lines"
-        )
+        ) == Token(TokenKind.BLOCK_STRING, 0, 68, 1, 1, "spans\n  multiple\n    lines")
 
     def advance_line_after_lexing_multiline_block_string():
         assert (