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add str.prefixof, str.suffixof in theory_str

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This commit is contained in:
Murphy Berzish 2017-01-27 16:26:30 -05:00
parent 09ac5645e4
commit a879b24011
4 changed files with 49 additions and 0 deletions
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18
src/ast/rewriter/str_rewriter.cpp
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@ -375,6 +375,18 @@ br_status str_rewriter::mk_str_Replace(expr * base, expr * source, expr * target
}
}
br_status str_rewriter::mk_str_prefixof(expr * pre, expr * full, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (str.prefixof " << mk_pp(pre, m()) << " " << mk_pp(full, m()) << ")" << std::endl;);
result = m_strutil.mk_str_StartsWith(full, pre);
return BR_REWRITE_FULL;
}
br_status str_rewriter::mk_str_suffixof(expr * post, expr * full, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (str.suffixof" << mk_pp(post, m()) << " " << mk_pp(full, m()) << ")" << std::endl;);
result = m_strutil.mk_str_EndsWith(full, post);
return BR_REWRITE_FULL;
}
br_status str_rewriter::mk_str_to_int(expr * arg0, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (str.to-int " << mk_pp(arg0, m()) << ")" << std::endl;);
@ -623,6 +635,12 @@ 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_STR_PREFIXOF:
SASSERT(num_args == 2);
return mk_str_prefixof(args[0], args[1], result);
case OP_STR_SUFFIXOF:
SASSERT(num_args == 2);
return mk_str_suffixof(args[0], args[1], result);
case OP_STR_STR2INT:
SASSERT(num_args == 1);
return mk_str_to_int(args[0], result);

2
src/ast/rewriter/str_rewriter.h
View file

@ -53,6 +53,8 @@ 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_str_Substr(expr * base, expr * start, expr * len, expr_ref & result);
br_status mk_str_prefixof(expr * pre, expr * full, expr_ref & result);
br_status mk_str_suffixof(expr * post, expr * full, expr_ref & result);
br_status mk_str_to_int(expr * arg0, expr_ref & result);
br_status mk_str_from_int(expr * arg0, expr_ref & result);