muMLE/examples/woods/models.py

# Design meta-model
woods_mm_cs = """
    Animal:Class {
        abstract = True;
    }

    Bear:Class
    :Inheritance (Bear -> Animal)

    Man:Class {
        lower_cardinality = 1;
        upper_cardinality = 2;
        constraint = `get_value(get_slot(this, "weight")) > 20`;
    }
    :Inheritance (Man -> Animal)


    Man_weight:AttributeLink (Man -> Integer) {
        name = "weight";
        optional = False;
    }

    afraidOf:Association (Man -> Animal) {
        source_upper_cardinality = 6;
        target_lower_cardinality = 1;
    }
"""
# Runtime meta-model
woods_rt_mm_cs = woods_mm_cs + """
    AnimalState:Class {
        abstract = True;
    }
    AnimalState_dead:AttributeLink (AnimalState -> Boolean) {
        name = "dead";
        optional = False;
    }    
    of:Association (AnimalState -> Animal) {
        source_lower_cardinality = 1;
        source_upper_cardinality = 1;
        target_lower_cardinality = 1;
        target_upper_cardinality = 1;
    }

    BearState:Class {
        constraint = `get_type_name(get_target(get_outgoing(this, "of")[0])) == "Bear"`;
    }
    :Inheritance (BearState -> AnimalState)
    BearState_hunger:AttributeLink (BearState -> Integer) {
        name = "hunger";
        optional = False;
        constraint = ```
            val = get_value(get_target(this))
            val >= 0 and val <= 100
        ```;
    }

    ManState:Class {
        constraint = `get_type_name(get_target(get_outgoing(this, "of")[0])) == "Man"`;
    }
    :Inheritance (ManState -> AnimalState)

    attacking:Association (AnimalState -> ManState) {
        # Animal can only attack one Man at a time
        target_upper_cardinality = 1;

        # Man can only be attacked by one Animal at a time
        source_upper_cardinality = 1;

        constraint = ```
            attacker = get_source(this)
            if get_type_name(attacker) == "BearState":
                # only BearState has 'hunger' attribute
                hunger = get_value(get_slot(attacker, "hunger"))
            else:
                hunger = 100 # Man can always attack
            attacker_dead = get_value(get_slot(attacker, "dead"))
            attacked_state = get_target(this)
            attacked_dead = get_value(get_slot(attacked_state, "dead"))
            (
                hunger >= 50 
                and not attacker_dead # cannot attack while dead
                and not attacked_dead # cannot attack whoever is dead
            )
        ```;
    }

    attacking_starttime:AttributeLink (attacking -> Integer) {
        name = "starttime";
        optional = False;
        constraint = ```
            val = get_value(get_target(this))
            _, clock = get_all_instances("Clock")[0]
            current_time = get_slot_value(clock, "time")
            val >= 0 and val <= current_time
        ```;
    }

    # Just a clock singleton for keeping the time
    Clock:Class {
        lower_cardinality = 1;
        upper_cardinality = 1;
    }
    Clock_time:AttributeLink (Clock -> Integer) {
        name = "time";
        optional = False;
        constraint = `get_value(get_target(this)) >= 0`;
    }
"""

# Our design model - the part that doesn't change
woods_m_cs = """
    george:Man {
        weight = 80;
    }
    bill:Man {
        weight = 70;
    }

    teddy:Bear
    mrBrown:Bear

    # george is afraid of both bears
    :afraidOf (george -> teddy)
    :afraidOf (george -> mrBrown)

    # the men are afraid of each other
    :afraidOf (bill -> george)
    :afraidOf (george -> bill)
"""

# Our runtime model - the part that changes with every execution step
woods_rt_initial_m_cs = woods_m_cs + """
    georgeState:ManState {
        dead = False;
    }
    :of (georgeState -> george)

    billState:ManState {
        dead = False;
    }
    :of (billState -> bill)

    teddyState:BearState {
        dead = False;
        hunger = 40;
    }
    :of (teddyState -> teddy)

    mrBrownState:BearState {
        dead = False;
        hunger = 80;
    }
    :of (mrBrownState -> mrBrown)

    clock:Clock {
        time = 0;
    }
"""