Add nomove state transition option, session partitioned interactive example

Makefile

@@ -1,6 +1,9 @@
-examples: profile
+examples: profile session
 
-.PHONY: profile
+.PHONY: examples
 
 profile:
 	bash examples/compile.bash examples/profile
+
+session:
+	bash examples/compile.bash examples/session

asm/asm.go

@@ -260,7 +260,7 @@ var (
 		{"Comment", `(?:#)[^\n]*`},
 		{"Ident", `^[A-Z]+`},
 		{"Size", `[0-9]+`},
-		{"Sym", `[a-zA-Z_\*][a-zA-Z0-9_]*`},
+		{"Sym", `[a-zA-Z_\*\.][a-zA-Z0-9_]*`},
 		{"Whitespace", `[ \t]+`},
 		{"EOL", `[\n\r]+`},
 		{"Quote", `["']`},

dev/interactive/main.go

@@ -22,12 +22,8 @@ func main() {
 	fmt.Fprintf(os.Stderr, "starting session at symbol '%s' using resource dir: %s\n", root, dir)
 
 	ctx := context.Background()
-	en, err := engine.NewSizedEngine(dir, uint32(size))
+	en := engine.NewSizedEngine(dir, uint32(size))
-	if err != nil {
+	err := engine.Loop(&en, os.Stdin, os.Stdout, ctx)
-		fmt.Fprintf(os.Stderr, "engine create fail: %v\n", err)
-		os.Exit(1)
-	}
-	err = engine.Loop(&en, os.Stdin, os.Stdout, ctx)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "loop exited with error: %v\n", err)
 		os.Exit(1)

engine/default.go

@@ -9,7 +9,7 @@ import (
 )
 
 // NewDefaultEngine is a convenience function to instantiate a filesystem-backed engine with no output constraints.
-func NewDefaultEngine(dir string) (Engine, error) {
+func NewDefaultEngine(dir string) Engine {
 	st := state.NewState(0)
 	rs := resource.NewFsResource(dir)
 	ca := cache.NewCache()
@@ -21,7 +21,7 @@ func NewDefaultEngine(dir string) (Engine, error) {
 }
 
 // NewSizedEngine is a convenience function to instantiate a filesystem-backed engine with a specified output constraint.
-func NewSizedEngine(dir string, size uint32) (Engine, error) {
+func NewSizedEngine(dir string, size uint32) Engine {
 	st := state.NewState(0)
 	rs := resource.NewFsResource(dir)
 	ca := cache.NewCache()

engine/engine.go

@@ -33,7 +33,7 @@ type Engine struct {
 }
 
 // NewEngine creates a new Engine
-func NewEngine(cfg Config, st *state.State, rs resource.Resource, ca cache.Memory, ctx context.Context) (Engine, error) {
+func NewEngine(cfg Config, st *state.State, rs resource.Resource, ca cache.Memory, ctx context.Context) Engine {
 	var szr *render.Sizer
 	if cfg.OutputSize > 0 {
 		szr = render.NewSizer(cfg.OutputSize)
@@ -46,17 +46,19 @@ func NewEngine(cfg Config, st *state.State, rs resource.Resource, ca cache.Memor
 		vm: vm.NewVm(st, rs, ca, szr),
 	}
 	engine.root = cfg.Root	
-	return engine, nil
+
+	return engine
 }
 
 // Init must be explicitly called before using the Engine instance.
 //
 // It loads and executes code for the start node.
-func(en *Engine) Init(sym string, ctx context.Context) error {
+func(en *Engine) Init(ctx context.Context) error {
 	if en.initd {
 		log.Printf("already initialized")
 		return nil
 	}
+	sym := en.root
 	if sym == "" {
 		return fmt.Errorf("start sym empty")
 	}
@@ -97,7 +99,7 @@ func(en *Engine) Init(sym string, ctx context.Context) error {
 func (en *Engine) Exec(input []byte, ctx context.Context) (bool, error) {
 	var err error
 	if en.st.Moves == 0 {
-		err = en.Init(en.root, ctx)
+		err = en.Init(ctx)
 		if err != nil {
 			return false, err
 		}
@@ -165,6 +167,7 @@ func(en *Engine) WriteResult(w io.Writer, ctx context.Context) (int, error) {
 	return io.WriteString(w, r)
 }
 
+// start execution over at top node while keeping current state of client error flags.
 func(en *Engine) reset(ctx context.Context) error {
 	var err error
 	var isTop bool
@@ -181,5 +184,5 @@ func(en *Engine) reset(ctx context.Context) error {
 	}
 	en.st.Restart()
 	en.initd = false
-	return en.Init(en.root, ctx)
+	return en.Init(ctx)
 }

engine/engine_test.go

@@ -81,14 +81,11 @@ func TestEngineInit(t *testing.T) {
 	rs := NewFsWrapper(dataDir, &st)
 	ca := cache.NewCache().WithCacheSize(1024)
 	
-	en, err := NewEngine(Config{
+	en := NewEngine(Config{
 		Root: "root",
 	}, &st, &rs, ca, ctx)
-	if err != nil {
-		t.Fatal(err)
-	}
 
-	err = en.Init("root", ctx)
+	err = en.Init(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -141,13 +138,10 @@ func TestEngineExecInvalidInput(t *testing.T) {
 	ca := cache.NewCache().WithCacheSize(1024)
 
 	
-	en, err := NewEngine(Config{
+	en := NewEngine(Config{
 		Root: "root",
 	}, &st, &rs, ca, ctx)
-	if err != nil {
+	err := en.Init(ctx)
-		t.Fatal(err)
-	}
-	err = en.Init("root", ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -164,13 +158,10 @@ func TestEngineResumeTerminated(t *testing.T) {
 	rs := NewFsWrapper(dataDir, &st)
 	ca := cache.NewCache().WithCacheSize(1024)
 
-	en, err := NewEngine(Config{
+	en := NewEngine(Config{
 		Root: "root",
 	}, &st, &rs, ca, ctx)
-	if err != nil {
+	err := en.Init(ctx)
-		t.Fatal(err)
-	}
-	err = en.Init("root", ctx)
 	if err != nil {
 		t.Fatal(err)
 	}

engine/loop_test.go

@@ -23,11 +23,8 @@ func TestLoopTop(t *testing.T) {
 	cfg := Config{
 		Root: "root",
 	}
-	en, err := NewEngine(cfg, &st, &rs, ca, ctx)
+	en := NewEngine(cfg, &st, &rs, ca, ctx)
-	if err != nil {
+	err := en.Init(ctx)
-		t.Fatal(err)
-	}
-	err = en.Init("root", ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -62,11 +59,8 @@ func TestLoopBackForth(t *testing.T) {
 	cfg := Config{
 		Root: "root",
 	}
-	en, err := NewEngine(cfg, &st, &rs, ca, ctx)
+	en := NewEngine(cfg, &st, &rs, ca, ctx)
-	if err != nil {
+	err := en.Init(ctx)
-		t.Fatal(err)
-	}
-	err = en.Init("root", ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -99,11 +93,8 @@ func TestLoopBrowse(t *testing.T) {
 		OutputSize: 68,
 		Root: "root",
 	}
-	en, err := NewEngine(cfg, &st, &rs, ca, ctx)
+	en := NewEngine(cfg, &st, &rs, ca, ctx)
-	if err != nil {
+	err := en.Init(ctx)
-		t.Fatal(err)
-	}
-	err = en.Init("root", ctx)
 	if err != nil {
 		t.Fatal(err)
 	}

engine/persist.go

@@ -24,10 +24,7 @@ func RunPersisted(cfg Config, rs resource.Resource, pr persist.Persister, input
 		return err
 	}
 
-	en, err := NewEngine(cfg, pr.GetState(), rs, pr.GetMemory(), ctx)
+	en := NewEngine(cfg, pr.GetState(), rs, pr.GetMemory(), ctx)
-	if err != nil {
-		return err
-	}
 
 	c, err := en.WriteResult(w, ctx)
 	if err != nil {

examples/profile/main.go

@@ -122,9 +122,10 @@ func main() {
 		OutputSize: uint32(size),
 	}
 	ctx := context.Background()
-	en, err := engine.NewEngine(cfg, &st, rs, ca, ctx)
+	en := engine.NewEngine(cfg, &st, rs, ca, ctx)
+	err := en.Init(ctx)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "engine create fail: %v\n", err)
+		fmt.Fprintf(os.Stderr, "engine init fail: %v\n", err)
 		os.Exit(1)
 	}
 

examples/session/input

@@ -0,0 +1,2 @@
+hey hey hey
+your data is {{.do_save}}

examples/session/input.vis

@@ -0,0 +1,4 @@
+MAP do_save
+HALT
+RELOAD do_save
+INCMP * .

examples/session/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+
+	testdataloader "github.com/peteole/testdata-loader"
+
+	"git.defalsify.org/vise/cache"
+	"git.defalsify.org/vise/engine"
+	"git.defalsify.org/vise/resource"
+	"git.defalsify.org/vise/state"
+)
+
+var (
+	baseDir = testdataloader.GetBasePath()
+	scriptDir = path.Join(baseDir, "examples", "session")
+	emptyResult = resource.Result{}
+)
+
+func save(sym string, input []byte, ctx context.Context) (resource.Result, error) {
+	sessionId := ctx.Value("SessionId").(string)
+	sessionDir := path.Join(scriptDir, sessionId)
+	err := os.MkdirAll(sessionDir, 0700)
+	if err != nil {
+		return emptyResult, err
+	}
+	fp := path.Join(sessionDir, "data.txt")
+	if len(input) > 0 {
+		log.Printf("write data %s session %s", input, sessionId)
+		err = ioutil.WriteFile(fp, input, 0600)
+		if err != nil {
+			return emptyResult, err
+		}
+	}
+	r, err := ioutil.ReadFile(fp)
+	if err != nil {
+		err = ioutil.WriteFile(fp, []byte("(not set)"), 0600)
+		if err != nil {
+			return emptyResult, err
+		}
+	}
+	return resource.Result{
+		Content: string(r),	
+	}, nil
+}
+
+func main() {
+	var root string
+	var size uint
+	var sessionId string
+	flag.UintVar(&size, "s", 0, "max size of output")
+	flag.StringVar(&root, "root", "root", "entry point symbol")
+	flag.StringVar(&sessionId, "session-id", "default", "session id")
+	flag.Parse()
+	fmt.Fprintf(os.Stderr, "starting session at symbol '%s' using resource dir: %s\n", root, scriptDir)
+
+	st := state.NewState(0)
+	rs := resource.NewFsResource(scriptDir)
+	rs.AddLocalFunc("do_save", save)
+	ca := cache.NewCache()
+	cfg := engine.Config{
+		Root: "root",
+		SessionId: sessionId,
+		OutputSize: uint32(size),
+	}
+	ctx := context.Background()
+	ctx = context.WithValue(ctx, "SessionId", sessionId)
+	en := engine.NewEngine(cfg, &st, rs, ca, ctx)
+	err := en.Init(ctx)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "engine init fail: %v\n", err)
+		os.Exit(1)
+	}
+	err = engine.Loop(&en, os.Stdin, os.Stdout, ctx)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "loop exited with error: %v\n", err)
+		os.Exit(1)
+	}
+}

examples/session/root.vis

@@ -0,0 +1,2 @@
+LOAD do_save 0
+MOVE input

state/flag.go

@@ -1,11 +1,12 @@
 package state
 
 const (
-	FLAG_READIN = 1
+	FLAG_READIN = iota
-	FLAG_INMATCH = 2
+	FLAG_INMATCH 
-	FLAG_TERMINATE = 3
+	FLAG_TERMINATE 
-	FLAG_DIRTY = 4
+	FLAG_DIRTY
-	FLAG_LOADFAIL = 5
+	FLAG_WAIT
+	FLAG_LOADFAIL
 )
 
 func IsWriteableFlag(flag uint32) bool {
@@ -17,3 +18,6 @@ func IsWriteableFlag(flag uint32) bool {
 	//}
 	return false
 }
+
+type FlagDebugger struct {
+}

state/state.go

@@ -208,6 +208,10 @@ func(st *State) Next() (uint16, error) {
 	return st.SizeIdx, nil
 }
 
+func(st *State) Same() {
+	st.Moves += 1
+}
+
 // Previous moves to the next sink page index.
 //
 // Fails if try to move beyond index 0.
@@ -338,7 +342,7 @@ func(st *State) Restart() error {
 
 // String implements String interface
 func(st State) String() string {
-	return fmt.Sprintf("moves %v idx %v path: %s", st.Moves, st.SizeIdx, strings.Join(st.ExecPath, "/"))
+	return fmt.Sprintf("moves %v idx %v flags: 0x%x path: %s", st.Moves, st.SizeIdx, st.Flags, strings.Join(st.ExecPath, "/"))
 }
 
 // initializes all flags not in control of client.

vm/input.go

@@ -12,7 +12,7 @@ import (
 var (
 	inputRegexStr = "^[a-zA-Z0-9].*$"
 	inputRegex = regexp.MustCompile(inputRegexStr)
-	ctrlRegexStr = "^[><_^]$"
+	ctrlRegexStr = "^[><_^.]$"
 	ctrlRegex = regexp.MustCompile(ctrlRegexStr)
 	symRegexStr = "^[a-zA-Z0-9][a-zA-Z0-9_]+$"
 	symRegex = regexp.MustCompile(symRegexStr)
@@ -76,7 +76,7 @@ func CheckTarget(target []byte, st *state.State) (bool, error) {
 	switch target[0] {
 	case '_':
 		topOk, err := st.Top()
-		if err!= nil {
+		if err != nil {
 			return false, err
 		}
 		return topOk, nil
@@ -137,6 +137,10 @@ func applyTarget(target []byte, st *state.State, ca cache.Memory, ctx context.Co
 				return sym, idx, err
 			}
 		}
+	case '.':
+		st.Same()
+		location, idx := st.Where()
+		return location, idx, nil
 	default:
 		sym = string(target)
 		err := st.Down(sym)

vm/runner.go

@@ -31,6 +31,7 @@ func NewVm(st *state.State, rs resource.Resource, ca cache.Memory, sizer *render
 		sizer: sizer,
 	}
 	vmi.Reset()
+	log.Printf("vm created with state: %v", st)
 	return vmi
 }
 
@@ -65,6 +66,19 @@ func(vm *Vm) Run(b []byte, ctx context.Context) ([]byte, error) {
 		if err != nil {
 			panic(err)
 		}
+
+		waitChange, err := vm.st.ResetFlag(state.FLAG_WAIT)
+		if err != nil {
+			panic(err)
+		}
+		if waitChange {
+			log.Printf("waitchange")
+			_, err = vm.st.ResetFlag(state.FLAG_INMATCH)
+			if err != nil {
+				panic(err)
+			}
+		}
+
 		_, err = vm.st.SetFlag(state.FLAG_DIRTY)
 		if err != nil {
 			panic(err)
@@ -295,12 +309,7 @@ func(vm *Vm) RunInCmp(b []byte, ctx context.Context) ([]byte, error) {
 		panic(err)
 	}
 	if have {
-		if !reading {
+		if reading {
-			_, err = vm.st.ResetFlag(state.FLAG_INMATCH)
-			if err != nil {
-				panic(err)
-			}
-		} else {
 			log.Printf("ignoring input %s, already have match", sym)
 			return b, nil
 		}
@@ -320,11 +329,11 @@ func(vm *Vm) RunInCmp(b []byte, ctx context.Context) ([]byte, error) {
 		log.Printf("input wildcard match ('%s'), target '%s'", input, target)
 	} else {
 		if sym != string(input) {
+			log.Printf("foo")
 			return b, nil
 		} 
 		log.Printf("input match for '%s', target '%s'", input, target)
 	}
-
 	_, err = vm.st.SetFlag(state.FLAG_INMATCH)
 	if err != nil {
 		panic(err)
@@ -334,13 +343,10 @@ func(vm *Vm) RunInCmp(b []byte, ctx context.Context) ([]byte, error) {
 		panic(err)
 	}
 
-	target, _, err = applyTarget([]byte(target), vm.st, vm.ca, ctx)
+	newTarget, _, err := applyTarget([]byte(target), vm.st, vm.ca, ctx)
+	
 	_, ok := err.(*state.IndexError)
 	if ok {
-		_, err = vm.st.ResetFlag(state.FLAG_INMATCH)
-		if err != nil {
-			panic(err)
-		}
 		_, err = vm.st.SetFlag(state.FLAG_READIN)
 		if err != nil {
 			panic(err)
@@ -349,12 +355,16 @@ func(vm *Vm) RunInCmp(b []byte, ctx context.Context) ([]byte, error) {
 	} else if err != nil {
 		return b, err
 	}
+
+	target = newTarget
+
 	vm.Reset()
 
 	code, err := vm.rs.GetCode(target)
 	if err != nil {
 		return b, err
 	}
+	log.Printf("bar")
 	log.Printf("loaded additional code for target '%s': %x", target, code)
 	b = append(b, code...)
 	return b, err
@@ -368,7 +378,12 @@ func(vm *Vm) RunHalt(b []byte, ctx context.Context) ([]byte, error) {
 		return b, err
 	}
 	log.Printf("found HALT, stopping")
-	return b, err
+	
+	_, err = vm.st.SetFlag(state.FLAG_WAIT)
+	if err != nil {
+		panic(err)
+	}
+	return b, nil
 }
 
 // RunMSize executes the MSIZE opcode
@@ -454,6 +469,7 @@ func(vm *Vm) refresh(key string, rs resource.Resource, ctx context.Context) (str
 	input, _ := vm.st.GetInput()
 	r, err := fn(key, input, ctx)
 	if err != nil {
+		log.Printf("loadfail %v", err)
 		var perr error
 		_, perr = vm.st.SetFlag(state.FLAG_LOADFAIL)
 		if perr != nil {

vm/runner_test.go

@@ -541,6 +541,7 @@ func TestInputIgnore(t *testing.T) {
 
 	b := NewLine(nil, INCMP, []string{"foo", "one"}, nil, nil)
 	b = NewLine(b, INCMP, []string{"bar", "two"}, nil, nil)
+	b = NewLine(b, HALT, nil, nil, nil)
 
 	ctx := context.TODO()