Gates and Wires

A gate is a brick that computes something from its inputs, like AND or addition. Wirescript writes gates as expressions: every operator becomes one gate, and every name you use becomes a wire to the gate that made it.

Contents

• Code
• Run
• Under the Hood
• Use it: a two-way hall light
• Make

switch1 Enabled -> chip a
switch2 Enabled -> chip b
chip both -> light1 Enabled
chip either -> light2 Enabled

Code

@left in a: bool
@left in b: bool
@right out both = a && b
@right out either = a || b

&& is AND: true when both sides are. || is OR: true when either is. With two switches wired to a and b, and two lights on both and either, which lights are on for each of the four switch positions?

Run

1. Compile the chip and paste it in-game. Place two Switches and two Point Lights.
2. Wire each Switch’s Enabled to a and b, and both and either to each light’s Enabled.
3. Try all four positions. both lights only with both switches on. either lights with any switch on.

Under the Hood

Open the chip. It holds one AND gate and one OR gate, each wired from both pins, and nothing else.

The same circuit built by hand is two gate bricks and six wires. Wirescript writes the bricks and wires for you, and the source stays readable as the circuit grows.

let gives a value a name without adding a gate. The name is a wire you can use again:

@left in a: bool
@left in b: bool
let both = a && b
@right out lit = both
@right out dark = !both

! is NOT. This chip has two gates (AND and NOT): both names the AND gate’s output, and both outputs read it.

Use it: a two-way hall light

A hallway light with a switch at each end should change whenever either switch is flipped. That is exclusive OR, written ^^: true when exactly one side is true.

@left in near: bool
@left in far: bool
@right out light = near ^^ far

Wire a Switch at each end to near and far, and light to a Point Light’s Enabled. Flipping either switch changes the light.

Make

Make a chip with three switch inputs whose light turns on when at least two of them are on.

switch1 Enabled -> chip a
switch2 Enabled -> chip b
switch3 Enabled -> chip c
chip lit -> light Enabled

Next: Pure and Exec.