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add python API for newly exposed regex constructors

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-12-09 09:09:03 +01:00
parent 976fadf771
commit 8e6600c6be
3 changed files with 47 additions and 9 deletions
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44
src/api/python/z3/z3.py
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@ -9384,6 +9384,7 @@ class SeqSortRef(SortRef):
False
"""
return Z3_is_string_sort(self.ctx_ref(), self.ast)
def StringSort(ctx=None):
"""Create a string sort
@ -9507,8 +9508,29 @@ def Empty(s):
>>> e3 = Empty(SeqSort(IntSort()))
>>> print(e3)
seq.empty
>>> e4 = Empty(ReSort(SeqSort(IntSort())))
>>> print(e4)
re.empty
"""
return SeqRef(Z3_mk_seq_empty(s.ctx_ref(), s.ast), s.ctx)
if isinstance(s, SeqSortRef):
return SeqRef(Z3_mk_seq_empty(s.ctx_ref(), s.ast), s.ctx)
if isinstance(s, ReSortRef):
return ReRef(Z3_mk_re_empty(s.ctx_ref(), s.ast), s.ctx)
raise Z3Exception("Non-sequence, non-regular expression sort passed to Empty")
def Full(s):
"""Create the regular expression that accepts the universal langauge
>>> e = Full(ReSort(SeqSort(IntSort())))
>>> print(e)
re.all
>>> e1 = Full(ReSort(StringSort()))
>>> print(e1)
re.allchar
"""
if isinstance(s, ReSortRef):
return ReRef(Z3_mk_re_full(s.ctx_ref(), s.ast), s.ctx)
raise Z3Exception("Non-sequence, non-regular expression sort passed to Full")
def Unit(a):
"""Create a singleton sequence"""
@ -9624,10 +9646,10 @@ class ReSortRef(SortRef):
def ReSort(s):
if is_ast(s):
return ReSortRef(Z3_mk_re_sort(s.ctx.ref(), s.as_ast()), ctx)
return ReSortRef(Z3_mk_re_sort(s.ctx.ref(), s.ast), s.ctx)
if s is None or isinstance(s, Context):
ctx = _get_ctx(s)
return ReSortRef(Z3_mk_re_sort(ctx.ref(), Z3_mk_string_sort(ctx.ref())), ctx)
return ReSortRef(Z3_mk_re_sort(ctx.ref(), Z3_mk_string_sort(ctx.ref())), s.ctx)
raise Z3Exception("Regular expression sort constructor expects either a string or a context or no argument")
@ -9698,6 +9720,10 @@ def Option(re):
"""
return ReRef(Z3_mk_re_option(re.ctx_ref(), re.as_ast()), re.ctx)
def Complement(re):
"""Create the complement regular expression."""
return ReRef(Z3_mk_re_complement(re.ctx_ref(), re.as_ast()), re.ctx)
def Star(re):
"""Create the regular expression accepting zero or more repetitions of argument.
>>> re = Star(Re("a"))
@ -9709,3 +9735,15 @@ def Star(re):
True
"""
return ReRef(Z3_mk_re_star(re.ctx_ref(), re.as_ast()), re.ctx)
def Loop(re, lo, hi=0):
"""Create the regular expression accepting between a lower and upper bound repetitions
>>> re = Loop(Re("a"), 1, 3)
>>> print(simplify(InRe("aa", re)))
True
>>> print(simplify(InRe("aaaa", re)))
False
>>> print(simplify(InRe("", re)))
False
"""
return ReRef(Z3_mk_re_loop(re.ctx_ref(), re.as_ast(), lo, hi), re.ctx)