Fix another ancient bug in parsing of BRE-mode regular expressions.
While poking at the regex code, I happened to notice that the bug
squashed in commit afcc8772e
had a sibling: next() failed to return
a specific value associated with the '}' token for a "\{m,n\}"
quantifier when parsing in basic RE mode. Again, this could result
in treating the quantifier as non-greedy, which it never should be in
basic mode. For that to happen, the last character before "\}" that
sets "nextvalue" would have to set it to zero, or it'd have to have
accidentally been zero from the start. The failure can be provoked
repeatably with, for example, a bound ending in digit "0".
Like the previous patch, back-patch all the way.
This commit is contained in:
parent
614b7f18b3
commit
b5a66e7353
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@ -389,7 +389,7 @@ next(struct vars *v)
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{
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v->now++;
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INTOCON(L_BRE);
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RET('}');
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RETV('}', 1);
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}
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else
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FAILW(REG_BADBR);
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@ -614,7 +614,7 @@ ERROR: invalid regular expression: quantifier operand invalid
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-- expectError 7.15 - a*+ BADRPT
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select * from test_regex('a*+', '', '-');
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ERROR: invalid regular expression: quantifier operand invalid
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-- test for ancient brenext() bug; not currently in Tcl
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-- tests for ancient brenext() bugs; not currently in Tcl
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select * from test_regex('.*b', 'aaabbb', 'b');
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test_regex
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------------
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@ -622,6 +622,13 @@ select * from test_regex('.*b', 'aaabbb', 'b');
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{aaabbb}
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(2 rows)
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select * from test_regex('.\{1,10\}', 'abcdef', 'bQ');
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test_regex
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-----------------
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{0,REG_UBOUNDS}
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{abcdef}
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(2 rows)
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-- doing 8 "braces"
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-- expectMatch 8.1 NQ "a{0,1}" "" ""
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select * from test_regex('a{0,1}', '', 'NQ');
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@ -214,8 +214,9 @@ select * from test_regex('a?*', '', '-');
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select * from test_regex('a+*', '', '-');
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-- expectError 7.15 - a*+ BADRPT
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select * from test_regex('a*+', '', '-');
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-- test for ancient brenext() bug; not currently in Tcl
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-- tests for ancient brenext() bugs; not currently in Tcl
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select * from test_regex('.*b', 'aaabbb', 'b');
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select * from test_regex('.\{1,10\}', 'abcdef', 'bQ');
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-- doing 8 "braces"
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