Datatype Class Reference

Public Member Functions
def	__init__
def	declare_core (self, name, rec_name, args)
def	declare (self, name, args)
def	__repr__ (self)
def	create (self)

Data Fields
	ctx
	name
	constructors

Detailed Description

Helper class for declaring Z3 datatypes. 

>>> List = Datatype('List')
>>> List.declare('cons', ('car', IntSort()), ('cdr', List))
>>> List.declare('nil')
>>> List = List.create()
>>> # List is now a Z3 declaration
>>> List.nil
nil
>>> List.cons(10, List.nil)
cons(10, nil)
>>> List.cons(10, List.nil).sort()
List
>>> cons = List.cons
>>> nil  = List.nil
>>> car  = List.car
>>> cdr  = List.cdr
>>> n = cons(1, cons(0, nil))
>>> n
cons(1, cons(0, nil))
>>> simplify(cdr(n))
cons(0, nil)
>>> simplify(car(n))
1

Definition at line 4116 of file z3py.py.

Constructor & Destructor Documentation

def __init__	(		self,
			name,
			ctx = None
	)

Definition at line 4142 of file z3py.py.

    def __init__(self, name, ctx=None):
        self.ctx          = _get_ctx(ctx)
        self.name         = name
        self.constructors = []

Member Function Documentation

def __repr__

(

self

)

Definition at line 4174 of file z3py.py.

    def __repr__(self):
        return "Datatype(%s, %s)" % (self.name, self.constructors)

def create

(

self

)

Create a Z3 datatype based on the constructors declared using the mehtod `declare()`.

The function `CreateDatatypes()` must be used to define mutually recursive datatypes.

>>> List = Datatype('List')
>>> List.declare('cons', ('car', IntSort()), ('cdr', List))
>>> List.declare('nil')
>>> List = List.create()
>>> List.nil
nil
>>> List.cons(10, List.nil)
cons(10, nil)

Definition at line 4177 of file z3py.py.

Referenced by Datatype.declare().

    def create(self):
        """Create a Z3 datatype based on the constructors declared using the mehtod `declare()`.
        
        The function `CreateDatatypes()` must be used to define mutually recursive datatypes.

        >>> List = Datatype('List')
        >>> List.declare('cons', ('car', IntSort()), ('cdr', List))
        >>> List.declare('nil')
        >>> List = List.create()
        >>> List.nil
        nil
        >>> List.cons(10, List.nil)
        cons(10, nil)
        """
        return CreateDatatypes([self])[0]

def declare	(		self,
			name,
			args
	)

Declare constructor named `name` with the given accessors `args`. 
Each accessor is a pair `(name, sort)`, where `name` is a string and `sort` a Z3 sort or a reference to the datatypes being declared. 

In the followin example `List.declare('cons', ('car', IntSort()), ('cdr', List))` 
declares the constructor named `cons` that builds a new List using an integer and a List. 
It also declares the accessors `car` and `cdr`. The accessor `car` extracts the integer of a `cons` cell, 
and `cdr` the list of a `cons` cell. After all constructors were declared, we use the method create() to create 
the actual datatype in Z3.

>>> List = Datatype('List')
>>> List.declare('cons', ('car', IntSort()), ('cdr', List))
>>> List.declare('nil')
>>> List = List.create()

Definition at line 4154 of file z3py.py.

Referenced by Datatype.create().

    def declare(self, name, *args):
        """Declare constructor named `name` with the given accessors `args`. 
        Each accessor is a pair `(name, sort)`, where `name` is a string and `sort` a Z3 sort or a reference to the datatypes being declared. 

        In the followin example `List.declare('cons', ('car', IntSort()), ('cdr', List))` 
        declares the constructor named `cons` that builds a new List using an integer and a List. 
        It also declares the accessors `car` and `cdr`. The accessor `car` extracts the integer of a `cons` cell, 
        and `cdr` the list of a `cons` cell. After all constructors were declared, we use the method create() to create 
        the actual datatype in Z3.
        
        >>> List = Datatype('List')
        >>> List.declare('cons', ('car', IntSort()), ('cdr', List))
        >>> List.declare('nil')
        >>> List = List.create()
        """
        if __debug__:
            _z3_assert(isinstance(name, str), "String expected")
            _z3_assert(name != "", "Constructor name cannot be empty")
        return self.declare_core(name, "is_" + name, *args)

def declare_core	(		self,
			name,
			rec_name,
			args
	)

Definition at line 4147 of file z3py.py.

Referenced by Datatype.declare().

    def declare_core(self, name, rec_name, *args):
        if __debug__:
            _z3_assert(isinstance(name, str), "String expected")
            _z3_assert(isinstance(rec_name, str), "String expected")
            _z3_assert(all([_valid_accessor(a) for a in args]), "Valid list of accessors expected. An accessor is a pair of the form (String, Datatype|Sort)")
        self.constructors.append((name, rec_name, args))

Field Documentation

constructors

Definition at line 4145 of file z3py.py.

Referenced by Datatype.__repr__().

ctx

Definition at line 4143 of file z3py.py.

Referenced by Probe.__eq__(), Probe.__ge__(), AstVector.__getitem__(), AstMap.__getitem__(), ApplyResult.__getitem__(), Probe.__gt__(), Probe.__le__(), Probe.__lt__(), Probe.__ne__(), Fixedpoint.add_rule(), Tactic.apply(), ApplyResult.as_expr(), Fixedpoint.assert_exprs(), ApplyResult.convert_model(), Fixedpoint.get_answer(), Fixedpoint.get_assertions(), Fixedpoint.get_cover_delta(), Fixedpoint.get_rules(), AstMap.keys(), Fixedpoint.param_descrs(), Tactic.param_descrs(), Fixedpoint.parse_file(), Fixedpoint.parse_string(), Fixedpoint.set(), Tactic.solver(), Fixedpoint.statistics(), Solver.to_smt2(), and Fixedpoint.update_rule().

name

Definition at line 4144 of file z3py.py.

Referenced by Datatype.__repr__().