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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) {
pathValues, err := walk.Compound(state.path)
if err != nil {
panic("Tried to convert invalid atoms to values")
}
path := walk.PathFromWalkValues(pathValues)
state.out.Print(path, state.value)
}
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, err := state.in.Read()
if err != nil {
panic("Missing next value")
}
state.value = nextItem.Value
state.path = nextItem.Path
}
type AppendNextCommand struct {}
func (cmd AppendNextCommand) exec(state *ProgramState) {
nextItem, err := state.in.Read()
if err != nil {
panic("Missing next value")
}
state.value = walk.ConcatData(state.value, nextItem.Value)
state.path = nextItem.Path
}
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.Transducer, in []walk.Atom) (out []walk.Atom, error bool) {
atomsOut, error := subex.RunTransducer(state, in)
if error {
return nil, true
}
return atomsOut, false
}
type SubstituteValueCommand struct {
subex subex.Transducer
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.Transducer
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 = walk.ConcatData(state.path, state.value)
}
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