diff --git a/src/contexts/cli/cli.go b/src/contexts/cli/cli.go
index c8c6bb40..ca3bc6ee 100644
--- a/src/contexts/cli/cli.go
+++ b/src/contexts/cli/cli.go
@@ -140,6 +140,7 @@ func (cli *CLI) Start(m *ctx.Message, arg ...string) bool { // {{{
 	}
 
 	m.Options("scan_end", false)
+	m.Optionv("ps_target", cli.target)
 	m.Option("prompt", m.Conf("prompt"))
 	m.Cap("stream", m.Spawn(yac.Target()).Call(func(cmd *ctx.Message) *ctx.Message {
 		if !m.Caps("parse") {
@@ -160,6 +161,7 @@ func (cli *CLI) Start(m *ctx.Message, arg ...string) bool { // {{{
 			m.Options("scan_end", true)
 			m.Target().Close(m.Spawn())
 		}
+		m.Optionv("ps_target", cli.target)
 		return nil
 	}, "parse", arg[1]).Target().Name)
 
@@ -235,6 +237,10 @@ var Index = &ctx.Context{Name: "cli", Help: "管理中心",
 		}},
 		"target": &ctx.Command{Name: "target module", Help: "设置当前模块, module: 模块全名", Hand: func(m *ctx.Message, c *ctx.Context, key string, arg ...string) {
 			if cli, ok := m.Target().Server.(*CLI); m.Assert(ok) { // {{{
+				if len(arg) == 0 {
+					m.Echo("%s", m.Cap("ps_target"))
+					return
+				}
 				if msg := m.Find(arg[0]); msg != nil {
 					cli.target = msg.Target()
 					m.Cap("ps_target", cli.target.Name)
@@ -726,10 +732,6 @@ var Index = &ctx.Context{Name: "cli", Help: "管理中心",
 			}
 			// }}}
 		}},
-		"demo": &ctx.Command{Name: "demo word", Help: "", Hand: func(m *ctx.Message, c *ctx.Context, key string, arg ...string) {
-			m.Append("hi", "hello", "world")
-			m.Echo("nice")
-		}},
 	},
 }
 
diff --git a/src/contexts/lex/lex.go b/src/contexts/lex/lex.go
index 9b21ca4a..e894c137 100644
--- a/src/contexts/lex/lex.go
+++ b/src/contexts/lex/lex.go
@@ -225,50 +225,7 @@ func (lex *LEX) train(page int, hash int, seed []byte) int { // {{{
 }
 
 // }}}
-func (lex *LEX) parse(page int, line []byte) (hash int, rest []byte, word []byte) { // {{{
-
-	pos := 0
-	for star, s := 0, page; s != 0 && pos < len(line); pos++ {
-
-		c := line[pos]
-		if c == '\\' && pos < len(line)-1 { //跳过转义
-			pos++
-			c = lex.charset(line[pos])[0]
-		}
-		if c > 127 { //跳过中文
-			word = append(word, c)
-			continue
-		}
-
-		state := lex.mat[s][c]
-		lex.Log("debug", nil, "(%d,%d): %v", s, c, state)
-		if state == nil {
-			s, star, pos = star, 0, pos-1
-			continue
-		}
-
-		word = append(word, c)
-
-		if state.star {
-			star = s
-		} else if x, ok := lex.mat[star][c]; !ok || !x.star {
-			star = 0
-		}
-
-		if s, hash = state.next, state.hash; s == 0 {
-			s, star = star, 0
-		}
-	}
-
-	if hash == 0 {
-		pos, word = 0, word[:0]
-	}
-	rest = line[pos:]
-	return
-}
-
-// }}}
-func (lex *LEX) scan(m *ctx.Message, page int, line []byte) (hash int, rest []byte, word []byte) { // {{{
+func (lex *LEX) parse(m *ctx.Message, page int, line []byte) (hash int, rest []byte, word []byte) { // {{{
 
 	pos := 0
 	for star, s := 0, page; s != 0 && pos < len(line); pos++ {
@@ -378,7 +335,6 @@ func (lex *LEX) Close(m *ctx.Message, arg ...string) bool { // {{{
 	case m.Target():
 	case m.Source():
 	}
-	return false
 	return true
 }
 
@@ -415,19 +371,7 @@ var Index = &ctx.Context{Name: "lex", Help: "词法中心",
 					page = lex.index("npage", arg[1])
 				}
 
-				hash, rest, word := lex.parse(page, []byte(arg[0]))
-				m.Result(0, hash, string(rest), string(word))
-				lex.Log("debug", nil, "\033[31m[%v]\033[0m %d [%v]", string(word), hash, string(rest))
-			} // }}}
-		}},
-		"scan": &ctx.Command{Name: "scan line [page]", Help: "解析单词", Hand: func(m *ctx.Message, c *ctx.Context, key string, arg ...string) {
-			if lex, ok := m.Target().Server.(*LEX); m.Assert(ok) { // {{{
-				page := 1
-				if len(arg) > 1 {
-					page = lex.index("npage", arg[1])
-				}
-
-				hash, rest, word := lex.scan(m, page, []byte(arg[0]))
+				hash, rest, word := lex.parse(m, page, []byte(arg[0]))
 				m.Result(0, hash, string(rest), string(word))
 			} // }}}
 		}},
@@ -449,9 +393,9 @@ var Index = &ctx.Context{Name: "lex", Help: "词法中心",
 				}
 
 				rest := []byte(arg[0])
-				_, _, rest = lex.parse(help, []byte(rest))
-				_, _, rest = lex.parse(void, []byte(rest))
-				hash, word, rest := lex.parse(page, []byte(rest))
+				_, _, rest = lex.parse(m, help, []byte(rest))
+				_, _, rest = lex.parse(m, void, []byte(rest))
+				hash, word, rest := lex.parse(m, page, []byte(rest))
 				m.Add("result", fmt.Sprintf("%d", hash), string(word), string(rest))
 			} // }}}
 		}},
@@ -502,11 +446,6 @@ var Index = &ctx.Context{Name: "lex", Help: "词法中心",
 			} // }}}
 		}},
 	},
-	Index: map[string]*ctx.Context{
-		"void": &ctx.Context{Name: "void", Help: "void",
-			Commands: map[string]*ctx.Command{"parse": &ctx.Command{}},
-		},
-	},
 }
 
 func init() {
diff --git a/src/contexts/nfs/nfs.go b/src/contexts/nfs/nfs.go
index bd534e2e..b902967e 100644
--- a/src/contexts/nfs/nfs.go
+++ b/src/contexts/nfs/nfs.go
@@ -3,11 +3,11 @@ package nfs // {{{
 import ( // {{{
 	"contexts"
 	"encoding/json"
-	"errors"
 	"github.com/nsf/termbox-go"
 	"github.com/skip2/go-qrcode"
 
 	"bufio"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -25,11 +25,12 @@ import ( // {{{
 var FileNotExist = errors.New("file not exist")
 
 type NFS struct {
-	in            *os.File
-	out           *os.File
-	history       []string
-	pages         []string
-	width, height int
+	in      *os.File
+	out     *os.File
+	history []string
+	pages   []string
+	width   int
+	height  int
 
 	paths []string
 
@@ -470,8 +471,7 @@ func (nfs *NFS) Read(p []byte) (n int, err error) { // {{{
 
 			case termbox.KeyCtrlK:
 				if len(rest) > 0 {
-					back = back[:0]
-					back = append(back, rest...)
+					back = append([]rune{}, rest...)
 				}
 				rest = rest[:0]
 
@@ -487,16 +487,17 @@ func (nfs *NFS) Read(p []byte) (n int, err error) { // {{{
 				if len(tab) == 0 {
 					tabi = 0
 					prefix := string(buf)
-					msg := nfs.Message.Spawn(nfs.cli.Target())
-					target := msg.Cmd("target").Data["target"].(*ctx.Context)
-					msg.Spawn(target).BackTrace(func(msg *ctx.Message) bool {
-						for k, _ := range msg.Target().Commands {
+					target := nfs.Message.Target()
+					nfs.Message.Target(nfs.Optionv("ps_target").(*ctx.Context))
+					nfs.Message.BackTrace(func(m *ctx.Message) bool {
+						for k, _ := range m.Target().Commands {
 							if strings.HasPrefix(k, prefix) {
 								tab = append(tab, k[len(prefix):])
 							}
 						}
 						return true
 					})
+					nfs.Message.Target(target)
 				}
 
 				if tabi >= 0 && tabi < len(tab) {
@@ -619,8 +620,7 @@ func (nfs *NFS) Start(m *ctx.Message, arg ...string) bool { // {{{
 					nfs.print(v)
 				}
 				if msg.Append("file_pos0") != "" {
-					i = msg.Appendi("file_pos0")
-					i--
+					i = msg.Appendi("file_pos0") - 1
 				}
 			}
 			line = ""
@@ -1401,18 +1401,6 @@ var Index = &ctx.Context{Name: "nfs", Help: "存储中心",
 			} // }}}
 		}},
 	},
-	Index: map[string]*ctx.Context{
-		"void": &ctx.Context{Name: "void",
-			Commands: map[string]*ctx.Command{
-				"scan":  &ctx.Command{},
-				"open":  &ctx.Command{},
-				"save":  &ctx.Command{},
-				"load":  &ctx.Command{},
-				"genqr": &ctx.Command{},
-				"write": &ctx.Command{},
-			},
-		},
-	},
 }
 
 func init() {
diff --git a/src/contexts/yac/yac.go b/src/contexts/yac/yac.go
index 2f6ad7f9..ed5b54a6 100644
--- a/src/contexts/yac/yac.go
+++ b/src/contexts/yac/yac.go
@@ -192,7 +192,7 @@ func (yac *YAC) parse(m *ctx.Message, out *ctx.Message, page int, void int, line
 	for star, s := 0, page; s != 0 && len(line) > 0; {
 		//解析空白
 		lex := m.Sesss("lex")
-		lex.Cmd("scan", line, yac.name(void))
+		lex.Cmd("parse", line, yac.name(void))
 		if lex.Result(0) == "-1" {
 			break
 		}
@@ -200,7 +200,7 @@ func (yac *YAC) parse(m *ctx.Message, out *ctx.Message, page int, void int, line
 		//解析单词
 		line = lex.Result(1)
 		lex = m.Sesss("lex")
-		lex.Cmd("scan", line, yac.name(s))
+		lex.Cmd("parse", line, yac.name(s))
 		if lex.Result(0) == "-1" {
 			break
 		}
@@ -257,7 +257,6 @@ func (yac *YAC) parse(m *ctx.Message, out *ctx.Message, page int, void int, line
 
 func (yac *YAC) Spawn(m *ctx.Message, c *ctx.Context, arg ...string) ctx.Server { // {{{
 	yac.Message = m
-
 	c.Caches = map[string]*ctx.Cache{}
 	c.Configs = map[string]*ctx.Config{}
 
@@ -357,9 +356,7 @@ func (yac *YAC) Start(m *ctx.Message, arg ...string) (close bool) { // {{{
 func (yac *YAC) Close(m *ctx.Message, arg ...string) bool { // {{{
 	switch yac.Context {
 	case m.Target():
-		return true
 	case m.Source():
-		return false
 	}
 	return true
 }
@@ -373,15 +370,15 @@ var Index = &ctx.Context{Name: "yac", Help: "语法中心",
 	Configs: map[string]*ctx.Config{
 		"ncell": &ctx.Config{Name: "词法上限", Value: "128", Help: "词法集合的最大数量"},
 		"nlang": &ctx.Config{Name: "语法上限", Value: "32", Help: "语法集合的最大数量"},
-		"name": &ctx.Config{Name: "name", Value: "parse", Help: "模块名", Hand: func(m *ctx.Message, x *ctx.Config, arg ...string) string {
+		"label": &ctx.Config{Name: "嵌套标记", Value: "####################", Help: "嵌套层级日志的标记"},
+		"yac_name": &ctx.Config{Name: "yac_name", Value: "parse", Help: "模块名", Hand: func(m *ctx.Message, x *ctx.Config, arg ...string) string {
 			if len(arg) > 0 { // {{{
 				return arg[0]
 			}
 			return fmt.Sprintf("%s%d", x.Value, m.Capi("nparse", 1))
 			// }}}
 		}},
-		"help":  &ctx.Config{Name: "help", Value: "解析模块", Help: "模块帮助"},
-		"label": &ctx.Config{Name: "嵌套标记", Value: "####################", Help: "嵌套层级日志的标记"},
+		"yac_help": &ctx.Config{Name: "yac_help", Value: "解析模块", Help: "模块帮助"},
 	},
 	Commands: map[string]*ctx.Command{
 		"init": &ctx.Command{Name: "init [ncell [nlang]]", Help: "初始化语法矩阵", Hand: func(m *ctx.Message, c *ctx.Context, key string, arg ...string) {
@@ -455,22 +452,17 @@ var Index = &ctx.Context{Name: "yac", Help: "语法中心",
 			// }}}
 		}},
 		"parse": &ctx.Command{
-			Name: "parse filename [name [help]] [line line] [void void]",
-			Help: "解析文件, filename: name:模块名, help:模块帮助, 文件名, line: 默认语法, void: 默认空白",
+			Name: "parse filename [yac_name [help]] [line line] [void void]",
+			Help: "解析文件, filename: yac_name:模块名, yac_help:模块帮助, 文件名, line: 默认语法, void: 默认空白",
 			Hand: func(m *ctx.Message, c *ctx.Context, key string, arg ...string) {
 				if yac, ok := m.Target().Server.(*YAC); m.Assert(ok) { // {{{
 					m.Optioni("page", yac.page["line"])
 					m.Optioni("void", yac.page["void"])
-					m.Start(m.Confx("name", arg, 1), m.Confx("help", arg, 2), key, arg[0])
+					m.Start(m.Confx("yac_name", arg, 1), m.Confx("yac_help", arg, 2), key, arg[0])
 				}
 				// }}}
 			}},
 	},
-	Index: map[string]*ctx.Context{
-		"void": &ctx.Context{Name: "void", Help: "void",
-			Commands: map[string]*ctx.Command{"parse": &ctx.Command{}},
-		},
-	},
 }
 
 func init() {