Fix IndexError formatting a degenerate parenthesis group#862
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StripWhitespaceFilter._stripws_parenthesis indexes tokens[1] and tokens[-2] assuming a parenthesis always wraps inner content between an opening and closing token. Some inputs group otherwise: '(::)' becomes a single Identifier, so the enclosing Parenthesis holds one token and the index raises IndexError. Only strip inner whitespace when there is content to strip.
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StripWhitespaceFilter._stripws_parenthesisindexestokens[1]andtokens[-2], assuming a parenthesis always wraps content between an opening and closing token. Some inputs group otherwise:(::)is grouped as a single Identifier, so the enclosing Parenthesis holds one token and the index raisesIndexError.Repro:
sqlparse.format('(::)', reindent=True)(alsostrip_whitespace=True).Only strip inner whitespace when there is content between the delimiters. Normal parentheses are unaffected (
( a )->(a)).