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package main
import (
"main/walk"
"main/subex"
)
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 ToggleTerminalCommand struct {}
func (cmd ToggleTerminalCommand) exec(state *ProgramState) {
toggled := map[walk.TerminalValue]walk.TerminalValue {
walk.ArrayBegin: walk.MapBegin,
walk.ArrayEnd: walk.MapEnd,
walk.MapBegin: walk.ArrayBegin,
walk.MapEnd: walk.ArrayEnd,
}
for i := range state.value {
terminal, isTerminal := state.value[i].(walk.TerminalValue)
if !isTerminal {
continue
}
state.value[i] = toggled[terminal]
}
}
type FilteredCommand struct {
filter Filter
command Command
}
func (cmd FilteredCommand) exec(state *ProgramState) {
path := walk.PathFromWalkValues(state.path)
for _, value := range state.value {
if cmd.filter.exec(walk.WalkItem {
Value: value,
Path: path,
}) {
cmd.command.exec(state)
return
}
}
}
type SequenceCommand struct {
commands []Command
}
func (cmd SequenceCommand) exec(state *ProgramState) {
for _, command := range cmd.commands {
command.exec(state)
}
}
type AppendLiteralCommand struct {
values []walk.WalkValue
}
func (cmd AppendLiteralCommand) exec(state *ProgramState) {
state.value = append(state.value, cmd.values...)
}
type PrependLiteralCommand struct {
values []walk.WalkValue
}
func (cmd PrependLiteralCommand) exec(state *ProgramState) {
var newItems []walk.WalkValue
newItems = append(newItems, cmd.values...)
state.value = append(newItems, state.value...)
}
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 PrintLiteralsCommand struct {
items []walk.WalkItem
}
func (cmd PrintLiteralsCommand) exec(state *ProgramState) {
for _, item := range cmd.items {
state.out <- item
}
}
type DeleteAllCommand struct {}
func (cmd DeleteAllCommand) exec(state *ProgramState) {
state.path = nil
state.value = nil
}
type SubstituteCommand struct {
subex subex.SubexState
next Command
}
func (cmd SubstituteCommand) exec(state *ProgramState) {
valueStream := make(chan walk.WalkValue)
go func(in []walk.WalkValue, out chan<- walk.WalkValue) {
for _, value := range in {
out <- value
}
close(out)
}(state.value, valueStream)
atomStream := walk.Atomise(valueStream)
atomsOut, error := subex.RunTransducer(cmd.subex, atomStream)
if error {
return
}
valuesOut, err := walk.MemoryCompound(atomsOut)
if err != nil {
return
}
state.value = valuesOut
cmd.next.exec(state)
}
type Command interface {
exec(*ProgramState)
}
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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