From 1aa08f927c7043a643e847c434399fc76d053df0 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Wed, 26 Apr 2023 14:41:25 +0100
Subject: Store stred programs as a flat list of commands with no nesting,
 using a new jump command to simulate command blocks

---
 main/command.go | 100 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 83 insertions(+), 17 deletions(-)

(limited to 'main/command.go')

diff --git a/main/command.go b/main/command.go
index 296ad69..44fd9eb 100644
--- a/main/command.go
+++ b/main/command.go
@@ -3,10 +3,12 @@ package main
 import (
 	"main/walk"
 	"main/subex"
+	"fmt"
 )
 
 type Command interface {
 	exec(*ProgramState)
+	String() string
 }
 
 type PrintValueCommand struct {}
@@ -17,15 +19,10 @@ func (cmd PrintValueCommand) exec(state *ProgramState) {
 	}
 	path := walk.PathFromWalkValues(pathValues)
 	state.out.Print(path, state.value)
+	state.pc++
 }
-
-type SequenceCommand struct {
-	commands []Command
-}
-func (cmd SequenceCommand) exec(state *ProgramState) {
-	for _, command := range cmd.commands {
-		command.exec(state)
-	}
+func (cmd PrintValueCommand) String() string {
+	return "p"
 }
 
 type NextCommand struct {}
@@ -36,6 +33,10 @@ func (cmd NextCommand) exec(state *ProgramState) {
 	}
 	state.value = nextItem.Value
 	state.path = nextItem.Path
+	state.pc++
+}
+func (cmd NextCommand) String() string {
+	return "n"
 }
 
 type AppendNextCommand struct {}
@@ -46,16 +47,28 @@ func (cmd AppendNextCommand) exec(state *ProgramState) {
 	}
 	state.value = walk.ConcatData(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.Atom) (out []walk.Atom, error bool) {
@@ -68,43 +81,62 @@ func runSubex(state subex.Transducer, in []walk.Atom) (out []walk.Atom, error bo
 
 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.pc++
+	} else {
+		state.pc += 2
+		state.value = newValue
 	}
-	state.value = newValue
-	cmd.next.exec(state)
+}
+func (cmd SubstituteValueCommand) String() string {
+	return "s/.../"
 }
 
 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.pc++
+	} else {
+		state.pc += 2
+		state.path = newPath
 	}
-	state.path = newPath
-	cmd.next.exec(state)
+}
+func (cmd SubstitutePathCommand) String() string {
+	return "S/.../"
 }
 
 type NoopCommand struct {}
-func (cmd NoopCommand) exec(state *ProgramState) {}
+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 {}
@@ -112,11 +144,19 @@ 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 {}
@@ -124,11 +164,19 @@ 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 {}
@@ -136,9 +184,27 @@ 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 = walk.ConcatData(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)
 }
\ No newline at end of file
-- 
cgit v1.2.3