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package main
import (
"main/walk"
"main/subex"
)
type Command interface {
exec(*ProgramState)
}
type PrintValueCommand struct {}
func (cmd PrintValueCommand) exec(state *ProgramState) {
path := walk.PathFromWalkValues(state.path)
for _, value := range state.value {
state.out <- walk.WalkItem {
Value: value,
Path: path,
}
}
}
type SequenceCommand struct {
commands []Command
}
func (cmd SequenceCommand) exec(state *ProgramState) {
for _, command := range cmd.commands {
command.exec(state)
}
}
type NextCommand struct {}
func (cmd NextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.value = []walk.WalkValue{nextItem.Value}
state.path = nextItem.Path.ToWalkValues()
}
type AppendNextCommand struct {}
func (cmd AppendNextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.value = append(state.value, nextItem.Value)
state.path = nextItem.Path.ToWalkValues()
}
type DeleteValueCommand struct {}
func (cmd DeleteValueCommand) exec(state *ProgramState) {
state.value = nil
}
type DeletePathCommand struct {}
func (cmd DeletePathCommand) exec(state *ProgramState) {
state.path = nil
}
func runSubex(state subex.SubexState, in []walk.WalkValue) (out []walk.WalkValue, error bool) {
atomsIn := walk.Atomise(in)
atomsOut, error := subex.RunTransducer(state, atomsIn)
if error {
return nil, true
}
valuesOut, err := walk.Compound(atomsOut)
if err != nil {
return nil, true
}
return valuesOut, false
}
type SubstituteValueCommand struct {
subex subex.SubexState
next Command
}
func (cmd SubstituteValueCommand) exec(state *ProgramState) {
newValue, err := runSubex(cmd.subex, state.value)
if err {
return
}
state.value = newValue
cmd.next.exec(state)
}
type SubstitutePathCommand struct {
subex subex.SubexState
next Command
}
func (cmd SubstitutePathCommand) exec(state *ProgramState) {
newPath, err := runSubex(cmd.subex, state.path)
if err {
return
}
state.path = newPath
cmd.next.exec(state)
}
type NoopCommand struct {}
func (cmd NoopCommand) exec(state *ProgramState) {}
type SwapXRegCommand struct {}
func (cmd SwapXRegCommand) exec(state *ProgramState) {
v := state.value
state.value = state.xreg
state.xreg = v
}
type AppendXRegCommand struct {}
func (cmd AppendXRegCommand) exec(state *ProgramState) {
state.xreg = append(state.xreg, state.value...)
}
type SwapPathCommand struct {}
func (cmd SwapPathCommand) exec(state *ProgramState) {
v := state.value
state.value = state.path
state.path = v
}
type AppendPathCommand struct {}
func (cmd AppendPathCommand) exec(state *ProgramState) {
state.path = append(state.path, state.value...)
}
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