tvalentyn commented on a change in pull request #15901:
URL: https://github.com/apache/beam/pull/15901#discussion_r745961276
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File path: sdks/python/apache_beam/io/textio.py
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@@ -362,6 +391,15 @@ def _is_self_overlapping(delimiter):
return True
return False
+ def _is_escaped(self, read_buffer, position):
+ # Returns True if byte at position is preceded with an odd number
+ # of escapechar bytes or False if preceded by 0 or even escapes
+ # (the even number means that all the escapes are escaped themselves).
+ for current_pos in reversed(range(-1, position)):
+ if read_buffer.data[current_pos:current_pos + 1] != self._escapechar:
Review comment:
This logic is a little tricky to follow:
1. why do we go to -1 ?
2. can we compare a single byte at a position instead of a 1-character range?
why not to count `preceding_escape_chars` in a loop and then `return
preceding_escape_chars % 2 == 1` ?
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