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Updated regex derivative engine (#5567)

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* updated derivative engine

* some edit

* further improvements in derivative code

* more deriv code edits and re::to_str update

* optimized mk_deriv_accept

* fixed PR comments

* small syntax fix

* updated some simplifications

* bugfix:forgot to_re before reverse

* fixed PR comments

* more PR comment fixes

* more PR comment fixes

* forgot to delete

* deleting unused definition

* fixes

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* fixes

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Margus Veanes 2021-10-08 13:04:49 -07:00 • committed by GitHub
parent c0c3e685e7
commit 146f4621c5
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7 changed files with 893 additions and 280 deletions
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src/smt/seq_regex.h
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@ -158,12 +158,12 @@ namespace smt {
expr_ref symmetric_diff(expr* r1, expr* r2);
expr_ref is_nullable_wrapper(expr* r);
expr_ref derivative_wrapper(expr* hd, expr* r);
expr_ref mk_derivative_wrapper(expr* hd, expr* r);
// Various support for unfolding derivative expressions that are
// returned by derivative_wrapper
expr_ref mk_deriv_accept(expr* s, unsigned i, expr* r);
void get_all_derivatives(expr* r, expr_ref_vector& results);
void get_derivative_targets(expr* r, expr_ref_vector& targets);
void get_cofactors(expr* r, expr_ref_pair_vector& result);
void get_cofactors_rec(expr* r, expr_ref_vector& conds,
expr_ref_pair_vector& result);