382 lines
7.7 KiB
Go
382 lines
7.7 KiB
Go
package intcodeprocessor
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import (
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"errors"
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"fmt"
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helpers "git.bullercodeworks.com/brian/adventofcode/helpers"
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"io/ioutil"
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"math"
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"os"
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"strings"
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)
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const (
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OP_ADD = 1
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OP_MLT = 2
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OP_INP = 3
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OP_OUT = 4
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OP_JIT = 5
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OP_JIF = 6
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OP_ILT = 7
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OP_IEQ = 8
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OP_RBS = 9
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OP_EXT = 99
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)
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const (
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MODE_POS = iota
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MODE_IMM
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MODE_REL
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)
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const (
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RET_ERR = iota - 1
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RET_OK
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RET_DONE
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)
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type Program struct {
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originalCode []int
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code []int
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ptr int
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relBase int
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state int
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error error
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waitingForInput bool
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input chan int
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waitingForOutput bool
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output chan int
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debug bool
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}
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func ReadIntCodeFile(fn string) []int {
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dat, err := ioutil.ReadFile(fn)
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if err != nil {
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fmt.Println("Error reading program file:", err.Error())
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os.Exit(1)
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}
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var prog []int
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stringDat := strings.TrimSpace(string(dat))
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for _, v := range strings.Split(stringDat, ",") {
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prog = append(prog, helpers.Atoi(v))
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}
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return prog
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}
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func NewProgram(prog []int) *Program {
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p := new(Program)
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p.originalCode = make([]int, len(prog))
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p.code = make([]int, len(prog))
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copy(p.originalCode, prog)
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p.Reset()
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return p
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}
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func (p *Program) EnableDebug() {
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p.debug = true
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}
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func (p *Program) DisableDebug() {
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p.debug = false
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}
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func (p *Program) DebugLog(l string) {
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if p.debug {
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fmt.Print(l)
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}
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}
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func (p *Program) Reset() {
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copy(p.code, p.originalCode)
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p.ptr = 0
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p.state = RET_OK
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p.error = nil
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p.waitingForInput = false
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p.waitingForOutput = false
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p.input = make(chan int)
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p.output = make(chan int)
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p.relBase = 0
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}
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func (p *Program) GetCode() []int {
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return p.code
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}
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func (p *Program) State() int {
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return p.state
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}
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func (p *Program) Error() error {
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return p.error
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}
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func (p *Program) Run() int {
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for {
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p.state = p.Step()
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if p.state != RET_OK {
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return p.state
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}
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}
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}
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func (p *Program) Step() int {
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if len(p.code) < p.ptr {
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p.error = errors.New("Pointer Exception")
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return RET_ERR
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}
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p.DebugLog(p.String() + "\n")
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intcode := p.readNext()
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p.ptr++
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switch p.opCode(intcode) {
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case OP_ADD:
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v1, v2, v3 := p.readNextThree()
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p.DebugLog(fmt.Sprintf("ADD %d (%d, %d, %d)\n", intcode, v1, v2, v3))
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p.ptr = p.ptr + 3
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p.opAdd(intcode, v1, v2, v3)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_MLT:
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v1, v2, v3 := p.readNextThree()
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p.DebugLog(fmt.Sprintf("MLT %d (%d, %d, %d)\n", intcode, v1, v2, v3))
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p.ptr = p.ptr + 3
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p.opMult(intcode, v1, v2, v3)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_INP:
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v1 := p.readNext()
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p.DebugLog(fmt.Sprintf("INP %d (%d)\n", intcode, v1))
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p.ptr++
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p.opInp(intcode, v1)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_OUT:
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v1 := p.readNext()
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p.ptr++
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p.DebugLog(fmt.Sprintf("OUT %d (%d)\n", intcode, v1))
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p.opOut(intcode, v1)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_JIT:
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v1, v2 := p.readNextTwo()
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p.DebugLog(fmt.Sprintf("JIT %d (%d, %d)\n", intcode, v1, v2))
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p.ptr = p.ptr + 2
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p.opJumpIfTrue(intcode, v1, v2)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_JIF:
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v1, v2 := p.readNextTwo()
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p.DebugLog(fmt.Sprintf("JIF %d (%d, %d)\n", intcode, v1, v2))
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p.ptr = p.ptr + 2
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p.opJumpIfFalse(intcode, v1, v2)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_ILT:
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v1, v2, dest := p.readNextThree()
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p.DebugLog(fmt.Sprintf("ILT %d (%d, %d, %d)\n", intcode, v1, v2, dest))
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p.ptr = p.ptr + 3
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p.opIfLessThan(intcode, v1, v2, dest)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_IEQ:
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v1, v2, dest := p.readNextThree()
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p.DebugLog(fmt.Sprintf("IEQ %d (%d, %d, %d)\n", intcode, v1, v2, dest))
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p.ptr = p.ptr + 3
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p.opIfEqual(intcode, v1, v2, dest)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_RBS:
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v1 := p.readNext()
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p.DebugLog(fmt.Sprintf("RBS %d (%d)\n", intcode, v1))
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p.ptr = p.ptr + 1
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p.opModRelBase(intcode, v1)
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if p.error != nil {
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return RET_ERR
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}
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return RET_OK
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case OP_EXT:
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p.DebugLog(fmt.Sprintf("EXT %d\n", intcode))
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return RET_DONE
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}
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p.error = errors.New(fmt.Sprintf("Invalid OpCode (%d)", intcode))
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p.DebugLog(p.String())
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return RET_ERR
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}
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func (p *Program) GetCurrentOpCode() int {
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return p.code[p.ptr]
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}
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func (p *Program) GetProgramValueAt(idx int) int {
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p.ensureLength(idx)
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return p.code[idx]
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}
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func (p *Program) SetProgramValueAt(idx, val int) {
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p.ensureLength(idx)
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p.code[idx] = val
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}
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func (p *Program) NeedsInput() bool {
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return p.waitingForInput
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}
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func (p *Program) NeedsOutput() bool {
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return p.waitingForOutput
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}
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func (p *Program) opCode(intcode int) int {
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return intcode % 100
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}
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func (p *Program) paramMode(intcode, pNum int) int {
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plc := math.Pow10(pNum + 2)
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return ((intcode - p.opCode(intcode)) / int(plc)) % 10
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}
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func (p *Program) ensureLength(idx int) {
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for len(p.code) < idx+1 {
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p.code = append(p.code, 0)
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}
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}
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func (p *Program) readNext() int {
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p.ensureLength(p.ptr)
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return p.code[p.ptr]
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}
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func (p *Program) readNextTwo() (int, int) {
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p.ensureLength(p.ptr + 1)
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return p.code[p.ptr], p.code[p.ptr+1]
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}
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func (p *Program) readNextThree() (int, int, int) {
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p.ensureLength(p.ptr + 2)
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return p.code[p.ptr], p.code[p.ptr+1], p.code[p.ptr+2]
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}
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func (p *Program) get(mode, v int) int {
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if mode == MODE_POS {
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p.ensureLength(v)
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return p.code[v]
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} else if mode == MODE_REL {
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p.ensureLength(p.relBase + v)
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return p.code[p.relBase+v]
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}
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return v
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}
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func (p *Program) set(mode, idx, v int) {
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if mode == MODE_POS {
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p.ensureLength(idx)
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p.code[idx] = v
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} else if mode == MODE_REL {
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p.ensureLength(p.relBase + idx)
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p.code[p.relBase+idx] = v
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}
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}
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func (p *Program) Input(v int) {
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p.input <- v
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p.waitingForInput = false
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}
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func (p *Program) Output() int {
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v := <-p.output
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p.waitingForOutput = false
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return v
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}
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func (p *Program) opAdd(intcode, a1, a2, dest int) {
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a1md, a2md, destmd := p.paramMode(intcode, 0), p.paramMode(intcode, 1), p.paramMode(intcode, 2)
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p.set(destmd, dest, p.get(a1md, a1)+p.get(a2md, a2))
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}
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func (p *Program) opMult(intcode, a1, a2, dest int) {
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a1md, a2md, destmd := p.paramMode(intcode, 0), p.paramMode(intcode, 1), p.paramMode(intcode, 2)
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p.set(destmd, dest, p.get(a1md, a1)*p.get(a2md, a2))
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}
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func (p *Program) opInp(intcode, dest int) {
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destmd := p.paramMode(intcode, 0)
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p.waitingForInput = true
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p.set(destmd, dest, <-p.input)
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p.waitingForInput = false
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}
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func (p *Program) opOut(intcode, val int) {
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valmd := p.paramMode(intcode, 0)
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ret := p.get(valmd, val)
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p.waitingForOutput = true
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p.output <- ret
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}
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func (p *Program) opJumpIfTrue(intcode, v1, v2 int) {
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v1md, v2md := p.paramMode(intcode, 0), p.paramMode(intcode, 1)
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if p.get(v1md, v1) != 0 {
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p.ptr = p.get(v2md, v2)
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}
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}
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func (p *Program) opJumpIfFalse(intcode, v1, v2 int) {
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v1md, v2md := p.paramMode(intcode, 0), p.paramMode(intcode, 1)
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if p.get(v1md, v1) == 0 {
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p.ptr = p.get(v2md, v2)
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}
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}
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func (p *Program) opIfLessThan(intcode, v1, v2, dest int) {
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v1md, v2md, destmd := p.paramMode(intcode, 0), p.paramMode(intcode, 1), p.paramMode(intcode, 2)
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if p.get(v1md, v1) < p.get(v2md, v2) {
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p.set(destmd, dest, 1)
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} else {
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p.set(destmd, dest, 0)
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}
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}
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func (p *Program) opIfEqual(intcode, v1, v2, dest int) {
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v1md, v2md, destmd := p.paramMode(intcode, 0), p.paramMode(intcode, 1), p.paramMode(intcode, 2)
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if p.get(v1md, v1) == p.get(v2md, v2) {
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p.set(destmd, dest, 1)
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} else {
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p.set(destmd, dest, 0)
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}
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}
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func (p *Program) opModRelBase(intcode, v1 int) {
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v1md := p.paramMode(intcode, 0)
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p.relBase = p.relBase + p.get(v1md, v1)
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}
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func (p Program) String() string {
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var ret string
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ret = ret + fmt.Sprintf("(PTR: %d, RBS: %d)\n", p.ptr, p.relBase)
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for k := range p.code {
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if k == p.ptr {
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ret = fmt.Sprintf("%s [%d]", ret, p.code[k])
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} else {
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ret = fmt.Sprintf("%s %d", ret, p.code[k])
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}
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}
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return ret
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}
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