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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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8
src/ast/seq_decl_plugin.h
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@ -75,6 +75,8 @@ enum seq_op_kind {
OP_RE_FULL_SEQ_SET,
OP_RE_FULL_CHAR_SET,
OP_RE_OF_PRED,
OP_RE_REVERSE,
OP_RE_DERIVATIVE, // Char -> RegEx -> RegEx
// string specific operators.
@ -427,6 +429,8 @@ public:
app* mk_full_seq(sort* s);
app* mk_empty(sort* s);
app* mk_of_pred(expr* p);
app* mk_reverse(expr* r) { return m.mk_app(m_fid, OP_RE_REVERSE, r); }
app* mk_derivative(expr* ele, expr* r) { return m.mk_app(m_fid, OP_RE_DERIVATIVE, ele, r); }
bool is_to_re(expr const* n) const { return is_app_of(n, m_fid, OP_SEQ_TO_RE); }
bool is_concat(expr const* n) const { return is_app_of(n, m_fid, OP_RE_CONCAT); }
@ -443,6 +447,8 @@ public:
bool is_full_char(expr const* n) const { return is_app_of(n, m_fid, OP_RE_FULL_CHAR_SET); }
bool is_full_seq(expr const* n) const { return is_app_of(n, m_fid, OP_RE_FULL_SEQ_SET); }
bool is_of_pred(expr const* n) const { return is_app_of(n, m_fid, OP_RE_OF_PRED); }
bool is_reverse(expr const* n) const { return is_app_of(n, m_fid, OP_RE_REVERSE); }
bool is_derivative(expr const* n) const { return is_app_of(n, m_fid, OP_RE_DERIVATIVE); }
MATCH_UNARY(is_to_re);
MATCH_BINARY(is_concat);
MATCH_BINARY(is_union);
@ -454,6 +460,8 @@ public:
MATCH_UNARY(is_plus);
MATCH_UNARY(is_opt);
MATCH_UNARY(is_of_pred);
MATCH_UNARY(is_reverse);
MATCH_BINARY(is_derivative);
bool is_loop(expr const* n, expr*& body, unsigned& lo, unsigned& hi);
bool is_loop(expr const* n, expr*& body, unsigned& lo);
bool is_loop(expr const* n, expr*& body, expr*& lo, expr*& hi);