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add way to access range bounds directly #6186

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-07-22 09:35:25 -07:00
parent 87dd837b55
commit 1e0f71c971
2 changed files with 26 additions and 0 deletions
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25
src/ast/seq_decl_plugin.cpp
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@ -1107,6 +1107,31 @@ unsigned seq_util::rex::max_length(expr* r) const {
return UINT_MAX;
}
/**
\brief determine if \c n is a range regular expression where the lower and upper bounds
are given by single characters.
Range expressions where lower and upper bounds are not single characters are either
the empty language (when a bound is a string but not a single character) or symbolic
(when both bounds are not ground strings). The general is_range can be used to process
range expressions for these cases, but they don't correspond to mainstream regex usage.
*/
bool seq_util::rex::is_range(expr const* n, unsigned& lo, unsigned& hi) const {
expr* _lo, *_hi;
zstring los, his;
if (!is_range(n, _lo, _hi))
return false;
if (!u.str.is_string(_lo, los))
return false;
if (!u.str.is_string(_hi, his))
return false;
if (los.length() != 1 || his.length() != 1)
return false;
lo = los[0];
hi = his[0];
return true;
}
sort* seq_util::rex::to_seq(sort* re) {
(void)u;
SASSERT(u.is_re(re));