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intcode.go
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intcode.go
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package intcode
import "fmt"
// RunIntCodeProgram runs an intcode program
func RunIntCodeProgram(programInt []int, input chan int, output chan int, message chan Message) {
// Use maps instead of int arrays
program := make(map[int]int)
for i, val := range programInt {
program[i] = val
}
teriminate := false
relativeBase := 0
// Loop over opCodes, starting from zero
for opCodeI := 0; opCodeI < len(program); {
// Need to check what our opcode is, plus its param modes
opCode, paramModes := readOpCode(program[opCodeI])
//fmt.Println("Running", opCode, "with paramModes", paramModes)
switch opCode {
case 1:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Added to", program[opCodeI+3], "the numbers", param1, "and", param2)
placeParam(program, paramModes, 2, opCodeI, relativeBase, param1+param2)
opCodeI = opCodeI + 4
break
case 2:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Multiplied to", program[opCodeI+3], "the numbers", param1, "and", param2)
placeParam(program, paramModes, 2, opCodeI, relativeBase, param1*param2)
opCodeI = opCodeI + 4
break
case 3:
//fmt.Println("Waiting for input")
if message != nil {
message <- Message{MessageType: 0}
}
placeParam(program, paramModes, 0, opCodeI, relativeBase, <-input)
opCodeI = opCodeI + 2
break
case 4:
if message != nil {
message <- Message{MessageType: 1}
}
param1 := getOneParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("The output is", param1)
output <- param1
opCodeI = opCodeI + 2
break
case 5:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Checking if", param1, " is non zero, will place answer in", param2)
if param1 != 0 {
opCodeI = param2
} else {
opCodeI = opCodeI + 3
}
break
case 6:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Checking if", param1, " is zero, will place answer in", param2)
if param1 == 0 {
opCodeI = param2
} else {
opCodeI = opCodeI + 3
}
break
case 7:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Checking if", param1, " is less then", param2, " will place answer in", program[program[opCodeI+3]])
if param1 < param2 {
placeParam(program, paramModes, 2, opCodeI, relativeBase, 1)
} else {
placeParam(program, paramModes, 2, opCodeI, relativeBase, 0)
}
opCodeI = opCodeI + 4
break
case 8:
param1, param2 := getTwoParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("Checking if", param1, " is equal to", param2, " will place answer in", program[program[opCodeI+3]])
if param1 == param2 {
placeParam(program, paramModes, 2, opCodeI, relativeBase, 1)
} else {
placeParam(program, paramModes, 2, opCodeI, relativeBase, 0)
}
opCodeI = opCodeI + 4
break
case 9:
param1 := getOneParams(program, paramModes, opCodeI, relativeBase)
//fmt.Println("The output is", param1)
relativeBase += param1
opCodeI = opCodeI + 2
break
case 99:
//fmt.Println("teriminated")
teriminate = true
break
default:
fmt.Println("Error")
teriminate = true
break
}
if teriminate {
break
}
}
}
// RunIntCodeProgramWaitForTermination runs an intcode program then sends a true signal to the t channel
func RunIntCodeProgramWaitForTermination(program []int, input chan int, output chan int, t chan bool, message chan Message) {
RunIntCodeProgram(program, input, output, message)
t <- true
}
// ReadOpCode TODO: There has to be a better way to do this
func readOpCode(opCodeFull int) (int, [3]int) {
opCode := opCodeFull % 100
parameterModes := [3]int{0, 0, 0}
params := (opCodeFull - opCode) / 100
parameterModes[0] = params % 10
parameterModes[1] = (params / 10) % 10
parameterModes[2] = (params / 100) % 10
return opCode, parameterModes
}
func getOneParams(program map[int]int, paramModes [3]int, opCodeI int, relativeBase int) int {
param1 := 0
if paramModes[0] == 0 {
param1 = program[program[opCodeI+1]]
} else if paramModes[0] == 1 {
param1 = program[opCodeI+1]
} else if paramModes[0] == 2 {
param1 = program[program[opCodeI+1]+relativeBase]
}
return param1
}
func getTwoParams(program map[int]int, paramModes [3]int, opCodeI int, relativeBase int) (int, int) {
param1 := 0
if paramModes[0] == 0 {
param1 = program[program[opCodeI+1]]
} else if paramModes[0] == 1 {
param1 = program[opCodeI+1]
} else if paramModes[0] == 2 {
param1 = program[program[opCodeI+1]+relativeBase]
}
param2 := 0
if paramModes[1] == 0 {
param2 = program[program[opCodeI+2]]
} else if paramModes[1] == 1 {
param2 = program[opCodeI+2]
} else if paramModes[1] == 2 {
param2 = program[program[opCodeI+2]+relativeBase]
}
return param1, param2
}
// Place a parameter into the program based on relative or position mode
func placeParam(program map[int]int, paramModes [3]int, outputParam int, opCodeI int, relativeBase int, value int) {
if paramModes[outputParam] == 0 {
program[program[opCodeI+outputParam+1]] = value
} else if paramModes[outputParam] == 2 {
program[program[opCodeI+outputParam+1]+relativeBase] = value
}
}
// Message is used to signal whether the intcode computer is waiting for input or waiting for output
// We can use this to decide whether to send input or take output from the program
// MessageTypes are 0 for input, 1 for output
type Message struct {
MessageType int
}