Exemplo n.º 1
0
func difference(a, b, c interface{}) l.Goal {
	return l.AddC(l.Constraint{
		func(s l.S) (l.S, l.ConstraintResult) {
			fmt.Println("====")
			fmt.Println(a)
			fmt.Println(b)
			fmt.Println(c)

			xo := l.Project(a, s)
			x, xok := xo.(int)
			yo := l.Project(b, s)
			y, yok := yo.(int)
			zo := l.Project(c, s)
			z, zok := zo.(int)

			if xok && yok && zok && x-y == z {
				fmt.Println("a")
				return s, l.Yes
			} else if xok && yok && zok && x-y != z {
				fmt.Println("b")
				fmt.Println(x)
				fmt.Println(y)
				fmt.Println(z)
				return s, l.No
			} else if xok && yok {
				fmt.Println("c")
				ns, success := l.Unifi(c, x-y, s)
				fmt.Println(success)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else if xok && zok {
				fmt.Println("d")
				ns, success := l.Unifi(b, x-z, s)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else if yok && zok {
				fmt.Println("e")
				ns, success := l.Unifi(a, y+z, s)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else {
				return s, l.Maybe
			}

		}})
}
Exemplo n.º 2
0
func mult(a, b, c interface{}) l.Goal {
	return l.AddC(l.Constraint{
		func(s l.S) (l.S, l.ConstraintResult) {
			//fmt.Println("mult")
			xo := l.Project(a, s)
			x, xok := xo.(int)
			yo := l.Project(b, s)
			y, yok := yo.(int)
			zo := l.Project(c, s)
			z, zok := zo.(int)

			if xok && yok && zok && x*y == z {
				//fmt.Println("a")
				return s, l.Yes
			} else if xok && yok && zok && x*y != z {
				//fmt.Println("b")
				return s, l.No
			} else if xok && yok {
				//fmt.Println("c")
				ns, success := l.Unifi(c, x*y, s)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else if xok && zok {
				ns, success := l.Unifi(b, z/x, s)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else if yok && zok {
				ns, success := l.Unifi(a, z/y, s)
				if success {
					return ns, l.Yes
				} else {
					return ns, l.No
				}
			} else {
				return s, l.Maybe
			}

		}})
}