Simplify reducers and add fast path to js reducer

main.go

@@ -135,6 +135,12 @@ func main() {
 			return
 		}
 		if lang == "js" {
+			simplePath, ok := SplitSimplePath(args)
+			if ok {
+				output := GetBySimplePath(object, simplePath)
+				Echo(output, theme)
+				os.Exit(0)
+			}
 			vm, fn, err := CreateJS(args, fxrc)
 			if err != nil {
 				fmt.Println(err)

pkg/reducer/js.go

@@ -19,13 +19,6 @@ func js(args []string, fxrc string) string {
 	for i, a := range args {
 		rs += "  try {"
 		switch {
-		case a == ".":
-			rs += `
-    x = function () 
-      { return this }
-    .call(x)
-`
-
 		case flatMapRegex.MatchString(a):
 			code := fold(strings.Split(a, "[]"))
 			rs += fmt.Sprintf(
@@ -100,6 +93,6 @@ func ReduceJS(vm *goja.Runtime, reduce goja.Callable, input interface{}, theme T
 		fmt.Print(output)
 		return 0
 	}
-	echo(object, theme)
+	Echo(object, theme)
 	return 0
 }

pkg/reducer/node.go

@@ -32,13 +32,6 @@ func nodejs(args []string, fxrc string) string {
 	for i, a := range args {
 		rs += "  try {"
 		switch {
-		case a == ".":
-			rs += `
-    x = function () 
-      { return this }
-    .call(x)
-`
-
 		case flatMapRegex.MatchString(a):
 			code := fold(strings.Split(a, "[]"))
 			rs += fmt.Sprintf(

pkg/reducer/python.go

@@ -17,20 +17,12 @@ var templatePython string
 func python(args []string) string {
 	rs := "\n"
 	for i, a := range args {
-		rs += "try:"
+		rs += fmt.Sprintf(
-		switch {
+			`try:
-		case a == ".":
-			rs += `
-    x = x
-`
-
-		default:
-			rs += fmt.Sprintf(
-				`
     f = (lambda x: (%v))(x)
     x = f(x) if callable(f) else f
 `, a)
-		}
+
 		// Generate a beautiful error message.
 		rs += "except Exception as e:\n"
 		pre, post, pointer := trace(args, i)

pkg/reducer/reduce.go

@@ -28,10 +28,10 @@ func GenerateCode(lang string, args []string, fxrc string) string {
 }
 
 func Reduce(input interface{}, lang string, args []string, theme Theme, fxrc string) int {
-	path, ok := splitPath(args)
+	path, ok := SplitSimplePath(args)
 	if ok {
-		output := getByPath(input, path)
+		output := GetBySimplePath(input, path)
-		echo(output, theme)
+		Echo(output, theme)
 		return 0
 	}
 	var cmd *exec.Cmd
@@ -68,7 +68,7 @@ func Reduce(input interface{}, lang string, args []string, theme Theme, fxrc str
 		fmt.Print(string(output))
 		return 0
 	}
-	echo(object, theme)
+	Echo(object, theme)
 	if dec.InputOffset() < int64(len(output)) {
 		fmt.Print(string(output[dec.InputOffset():]))
 	}

pkg/reducer/ruby.go

@@ -17,19 +17,10 @@ var templateRuby string
 func ruby(args []string) string {
 	rs := "\n"
 	for i, a := range args {
-		rs += "begin"
+		rs += fmt.Sprintf(
-		switch {
+			`begin
-		case a == ".":
-			rs += `
-    x = x
-`
-
-		default:
-			rs += fmt.Sprintf(
-				`
     x = lambda {|x| %v }.call(x)
 `, a)
-		}
 		// Generate a beautiful error message.
 		rs += "rescue Exception => e\n"
 		pre, post, pointer := trace(args, i)

pkg/reducer/simple.go

@@ -24,7 +24,7 @@ const (
 	singleQuoteEscape
 )
 
-func splitPath(args []string) ([]interface{}, bool) {
+func SplitSimplePath(args []string) ([]interface{}, bool) {
 	path := make([]interface{}, 0)
 	for _, arg := range args {
 		s := ""
@@ -180,7 +180,7 @@ func isProp(ch rune) bool {
 	return unicode.IsLetter(ch) || unicode.IsDigit(ch) || ch == '_' || ch == '$'
 }
 
-func getByPath(object interface{}, path []interface{}) interface{} {
+func GetBySimplePath(object interface{}, path []interface{}) interface{} {
 	for _, get := range path {
 		switch get := get.(type) {
 		case string:

pkg/reducer/simple_test.go

@@ -83,7 +83,7 @@ func Test_splitPath(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
-			path, ok := splitPath(tt.args)
+			path, ok := SplitSimplePath(tt.args)
 			require.Equal(t, tt.want, path)
 			require.True(t, ok)
 		})
@@ -130,7 +130,7 @@ func Test_splitPath_negative(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
-			path, ok := splitPath(tt.args)
+			path, ok := SplitSimplePath(tt.args)
 			require.False(t, ok, path)
 		})
 	}

pkg/reducer/utils.go

@@ -9,7 +9,7 @@ import (
 	. "github.com/antonmedv/fx/pkg/theme"
 )
 
-func echo(object interface{}, theme Theme) {
+func Echo(object interface{}, theme Theme) {
 	if s, ok := object.(string); ok {
 		fmt.Println(s)
 	} else {