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package main
import (
"main/subex"
"main/walk"
"fmt"
)
type Command interface {
exec(*ProgramState)
String() string
}
type PrintValueCommand struct {}
func (cmd PrintValueCommand) exec(state *ProgramState) {
err := state.out.Write(walk.WalkItem {
Path: state.path,
Value: state.value,
})
if err != nil {
panic("Error while outputting")
}
state.pc++
}
func (cmd PrintValueCommand) String() string {
return "p"
}
type NextCommand struct {}
func (cmd NextCommand) exec(state *ProgramState) {
nextItem, err := state.in.Read()
if err != nil {
panic("Missing next value")
}
state.value = nextItem.Value
state.path = nextItem.Path
state.pc++
}
func (cmd NextCommand) String() string {
return "n"
}
type AppendNextCommand struct {}
func (cmd AppendNextCommand) exec(state *ProgramState) {
nextItem, err := state.in.Read()
if err != nil {
panic("Missing next value")
}
state.value = append(state.value, nextItem.Value...)
state.path = nextItem.Path
state.pc++
}
func (cmd AppendNextCommand) String() string {
return "N"
}
type DeleteValueCommand struct {}
func (cmd DeleteValueCommand) exec(state *ProgramState) {
state.value = nil
state.pc++
}
func (cmd DeleteValueCommand) String() string {
return "d"
}
type DeletePathCommand struct {}
func (cmd DeletePathCommand) exec(state *ProgramState) {
state.path = nil
state.pc++
}
func (cmd DeletePathCommand) String() string {
return "D"
}
func runSubex(state subex.Transducer, in walk.ValueList) (walk.ValueList, bool) {
out, error := subex.RunTransducer(state, in)
if error {
return nil, true
}
return out, false
}
type SubstituteValueCommand struct {
subex subex.Transducer
}
func (cmd SubstituteValueCommand) exec(state *ProgramState) {
newValue, err := runSubex(cmd.subex, state.value)
if err {
state.pc++
} else {
state.pc += 2
state.value = newValue
}
}
func (cmd SubstituteValueCommand) String() string {
return "s/.../"
}
type SubstitutePathCommand struct {
subex subex.Transducer
}
func (cmd SubstitutePathCommand) exec(state *ProgramState) {
newPath, err := runSubex(cmd.subex, state.path)
if err {
state.pc++
} else {
state.pc += 2
state.path = newPath
}
}
func (cmd SubstitutePathCommand) String() string {
return "S/.../"
}
type NoopCommand struct {}
func (cmd NoopCommand) exec(state *ProgramState) {
state.pc++
}
func (cmd NoopCommand) String() string {
return "o"
}
type SwapXRegCommand struct {}
func (cmd SwapXRegCommand) exec(state *ProgramState) {
v := state.value
state.value = state.xreg
state.xreg = v
state.pc++
}
func (cmd SwapXRegCommand) String() string {
return "x"
}
type AppendXRegCommand struct {}
func (cmd AppendXRegCommand) exec(state *ProgramState) {
state.xreg = append(state.xreg, state.value...)
state.pc++
}
func (cmd AppendXRegCommand) String() string {
return "X"
}
type SwapYRegCommand struct {}
func (cmd SwapYRegCommand) exec(state *ProgramState) {
v := state.value
state.value = state.yreg
state.yreg = v
state.pc++
}
func (cmd SwapYRegCommand) String() string {
return "y"
}
type AppendYRegCommand struct {}
func (cmd AppendYRegCommand) exec(state *ProgramState) {
state.yreg = append(state.yreg, state.value...)
state.pc++
}
func (cmd AppendYRegCommand) String() string {
return "Y"
}
type SwapZRegCommand struct {}
func (cmd SwapZRegCommand) exec(state *ProgramState) {
v := state.value
state.value = state.zreg
state.zreg = v
state.pc++
}
func (cmd SwapZRegCommand) String() string {
return "z"
}
type AppendZRegCommand struct {}
func (cmd AppendZRegCommand) exec(state *ProgramState) {
state.zreg = append(state.zreg, state.value...)
state.pc++
}
func (cmd AppendZRegCommand) String() string {
return "Z"
}
type SwapPathCommand struct {}
func (cmd SwapPathCommand) exec(state *ProgramState) {
v := state.value
state.value = state.path
state.path = v
state.pc++
}
func (cmd SwapPathCommand) String() string {
return "k"
}
type AppendPathCommand struct {}
func (cmd AppendPathCommand) exec(state *ProgramState) {
state.path = append(state.path, state.value...)
state.pc++
}
func (cmd AppendPathCommand) String() string {
return "K"
}
type JumpCommand struct {
destination int
}
func (cmd JumpCommand) exec(state *ProgramState) {
state.pc = cmd.destination
}
func (cmd JumpCommand) String() string {
return fmt.Sprintf("b%v", cmd.destination)
}
// Placeholder as the branch destination may not have been parsed when the branch command is
// Should never appear in a program to actually be run
type BranchPlaceholderCommand struct {
label rune
}
func (cmd BranchPlaceholderCommand) exec(state *ProgramState) {
panic("Tried to execute a BranchPlaceholderCommand!!!")
}
func (cmd BranchPlaceholderCommand) String() string {
return fmt.Sprintf("b%c", cmd.label)
}
|
