Pattern parsing fixes related to escape handling #87
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This also fixes an unrelated bug when parsing needles which contain non-ASCI Unicode.
alexrutar
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This PR implements three parsing fixes.
\inMultiPattern::reparse#66: we now check for a trailing backslash\when running 'reparse' to correctly force a complete rescore (rather than just an update).is_whitespacechecks (same behaviour as with the Unicode handling).\push that had to be deferred until the beginning of the subsequent loop. This was causing invalid handling of e.g.foö\ bar.I've also added quite a few tests to check that the parsing code behaves as expected.
This was previously #67 but now slightly better implementation and I'm making a new PR because the other one is filled with unnecessary details.