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package main
type PrintValueCommand struct {}
func (cmd PrintValueCommand) exec(state *ProgramState) {
for _, item := range state.space {
state.out <- item
}
}
type ToggleTerminalCommand struct {}
func (cmd ToggleTerminalCommand) exec(state *ProgramState) {
toggled := map[TerminalValue]TerminalValue {
ArrayBegin: MapBegin,
ArrayEnd: MapEnd,
MapBegin: ArrayBegin,
MapEnd: ArrayEnd,
}
for i := range state.space {
terminal, isTerminal := state.space[i].value.(TerminalValue)
if !isTerminal {
continue
}
state.space[i].value = toggled[terminal]
}
}
type FilteredCommand struct {
filter Filter
command Command
}
func (cmd FilteredCommand) exec(state *ProgramState) {
for _, item := range state.space {
if cmd.filter.exec(item) {
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 []WalkValue
}
func (cmd AppendLiteralCommand) exec(state *ProgramState) {
for _, value := range cmd.values {
state.space = append(state.space, WalkItem {
path: nil,
value: value,
})
}
}
type PrependLiteralCommand struct {
values []WalkValue
}
func (cmd PrependLiteralCommand) exec(state *ProgramState) {
var newItems []WalkItem
for _, value := range cmd.values {
newItems = append(newItems, WalkItem {
path: nil,
value: value,
})
}
state.space = append(newItems, state.space...)
}
type NextCommand struct {}
func (cmd NextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.space = []WalkItem{nextItem}
}
type AppendNextCommand struct {}
func (cmd AppendNextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.space = append(state.space, nextItem)
}
type PrintLiteralsCommand struct {
items []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.space = nil
}
type Command interface {
exec(*ProgramState)
}
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