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starting regex support, rewriter

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This commit is contained in:
Murphy Berzish 2016-06-21 21:13:16 -04:00
parent a808a8c587
commit 4c34629806
4 changed files with 63 additions and 0 deletions
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27
src/ast/rewriter/str_rewriter.cpp
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@ -198,6 +198,27 @@ br_status str_rewriter::mk_str_Replace(expr * base, expr * source, expr * target
}
}
br_status str_rewriter::mk_re_Str2Reg(expr * str, expr_ref & result) {
// the argument to Str2Reg *must* be a string constant
// TODO is an assertion error too strict here? this basically crashes the solver
VERIFY(m_strutil.is_string(str));
return BR_FAILED;
}
br_status str_rewriter::mk_re_RegexIn(expr * str, expr * re, expr_ref & result) {
// fast path:
// (RegexIn E (Str2Reg S)) --> (= E S)
if (m_strutil.is_re_Str2Reg(re)) {
TRACE("t_str_rw", tout << "RegexIn fast path: " << mk_pp(str, m()) << " in " << mk_pp(re, m()) << std::endl;);
expr * regexStr = to_app(re)->get_arg(0);
VERIFY(m_strutil.is_string(regexStr));
result = m().mk_eq(str, regexStr);
return BR_REWRITE_FULL;
}
return BR_FAILED;
}
br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
SASSERT(f->get_family_id() == get_fid());
@ -229,6 +250,12 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_REPLACE:
SASSERT(num_args == 3);
return mk_str_Replace(args[0], args[1], args[2], result);
case OP_RE_STR2REGEX:
SASSERT(num_args == 1);
return mk_re_Str2Reg(args[0], result);
case OP_RE_REGEXIN:
SASSERT(num_args == 2);
return mk_re_RegexIn(args[0], args[1], result);
default:
return BR_FAILED;
}

3
src/ast/rewriter/str_rewriter.h
View file

@ -49,6 +49,9 @@ public:
br_status mk_str_LastIndexof(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_Replace(expr * base, expr * source, expr * target, expr_ref & result);
br_status mk_re_Str2Reg(expr * str, expr_ref & result);
br_status mk_re_RegexIn(expr * str, expr * re, expr_ref & result);
bool reduce_eq(expr * l, expr * r, expr_ref_vector & lhs, expr_ref_vector & rhs, bool & change);
bool reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_vector& lhs, expr_ref_vector& rhs, bool& change);