from z3 import *

"""
In Z3, variables are caleld *uninterpreted* consts and 
variables are *interpreted* consts.
"""

def is_expr_var(v):
    """
    EXAMPLES:

    >>> is_expr_var(Int('7'))
    True
    >>> is_expr_var(IntVal('7'))
    False
    >>> is_expr_var(Bool('y'))
    True
    >>> is_expr_var(Int('x') + 7 == Int('y'))
    False
    >>> LOnOff, (On,Off) = EnumSort("LOnOff",['On','Off'])
    >>> Block,Reset,SafetyInjection=Consts("Block Reset SafetyInjection",LOnOff)
    >>> is_expr_var(LOnOff)
    False
    >>> is_expr_var(On)
    False
    >>> is_expr_var(Block)
    True
    >>> is_expr_var(SafetyInjection)
    True
    """

    return is_const(v) and v.decl().kind()==Z3_OP_UNINTERPRETED

def is_expr_val(v):
    """
    EXAMPLES:

    >>> is_expr_val(Int('7'))
    False
    >>> is_expr_val(IntVal('7'))
    True
    >>> is_expr_val(Bool('y'))
    False
    >>> is_expr_val(Int('x') + 7 == Int('y'))
    False
    >>> LOnOff, (On,Off) = EnumSort("LOnOff",['On','Off'])
    >>> Block,Reset,SafetyInjection=Consts("Block Reset SafetyInjection",LOnOff)
    >>> is_expr_val(LOnOff)
    False
    >>> is_expr_val(On)
    True
    >>> is_expr_val(Block)
    False
    >>> is_expr_val(SafetyInjection)
    False
    """        
    return is_const(v) and v.decl().kind()!=Z3_OP_UNINTERPRETED