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add regex support for reverse and left/right derivative rewriting (#4477)

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* partial work on adding 'reverse' (broken code)

* new op codes for derivative and reverse + associated rewrite rules

* incorporate reverses and derivatives in rewriter + some fixes

* enable rewriting str.in_re constraints with right derivative
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calebstanford-msr 2020-05-29 16:00:37 -04:00 • committed by GitHub
parent 3d9d52f742
commit c939195c10
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5 changed files with 254 additions and 110 deletions
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5
src/ast/rewriter/seq_rewriter.h
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@ -135,6 +135,7 @@ class seq_rewriter {
// Support for regular expression derivatives
bool get_head_tail(expr* e, expr_ref& head, expr_ref& tail);
bool get_head_tail_reversed(expr* e, expr_ref& head, expr_ref& tail);
expr_ref re_and(expr* cond, expr* r);
expr_ref re_predicate(expr* cond, sort* seq_sort);
@ -175,6 +176,8 @@ class seq_rewriter {
br_status mk_re_power(func_decl* f, expr* a, expr_ref& result);
br_status mk_re_loop(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result);
br_status mk_re_range(expr* lo, expr* hi, expr_ref& result);
br_status mk_re_reverse(expr* r, expr_ref& result);
br_status mk_re_derivative(expr* ele, expr* r, expr_ref& result);
br_status lift_ite(func_decl* f, unsigned n, expr* const* args, expr_ref& result);
br_status reduce_re_eq(expr* a, expr* b, expr_ref& result);
br_status reduce_re_is_empty(expr* r, expr_ref& result);
@ -265,8 +268,6 @@ public:
void add_seqs(expr_ref_vector const& ls, expr_ref_vector const& rs, expr_ref_pair_vector& new_eqs);
expr_ref derivative(expr* hd, expr* r);
expr_ref is_nullable(expr* r);
bool has_cofactor(expr* r, expr_ref& cond, expr_ref& th, expr_ref& el);