feat: added way to print binary values.

tengo.go

@@ -43,13 +43,6 @@ func (tengo *Tengo) SetPreCompile(fn func(*Script)) *Tengo {
 	return tengo
 }
 
-func (pp *Tengo) Tags() [2]string {
-	return [2]string{
-		"{{",
-		"}}",
-	}
-}
-
 // Simple Evaler implementation for the Tengo language
 func (pp *Tengo) Eval(
 	ctx context.Context,
@@ -59,22 +52,27 @@ func (pp *Tengo) Eval(
 ) ([][]byte, error) {
 	var fullCodeBuf bytes.Buffer
 	const retHead = `
-		__ret_one__ := ""
-		printf := func(format, ...vals) {
-			__ret_one__ += sprintf(format, vals...)
+		__ret_one__ := bytes("")
+		pp := {
+			printf : func(format, ...vals) {
+				__ret_one__ += __sprintf__(format, vals...)
+			},
+
+			print : func(...vals) {
+				__ret_one__ += __sprint__(vals...)
+			},
+			println : func(...vals) {
+				__ret_one__ += __sprintln__(vals...)
+			},
+			write_raw : func(bts) {
+				__ret_one__ += bytes(bts)
+			}
 		}
 
-		print := func(...vals) {
-			__ret_one__ += sprint(vals...)
-		}
-
-		println := func(...vals) {
-			__ret_one__ += sprintln(vals...)
-		}
 	`
 
 	const retSeparator = `
-		__separate(__ret_one__)
+		__separate__(__ret_one__)
 		__ret_one__ = ""
 	`
 	rets := [][]byte{}
@@ -96,7 +94,7 @@ func (pp *Tengo) Eval(
 		pp.preCompile(script)
 	}
 
-	err := script.Add("sprintf", &tengo.UserFunction{
+	err := script.Add("__sprintf__", &tengo.UserFunction{
 			Value: func(args ...tengo.Object) (tengo.Object, error){
 				if len(args) < 1 {
 					return nil, tengo.ErrWrongNumArguments
@@ -113,52 +111,52 @@ func (pp *Tengo) Eval(
 					//fmt.Printf("shit: %q\n", gargs[i])
 				}
 				str := fmt.Sprintf(format, gargs...)
-				return tengo.FromInterface(str)
+				return tengo.FromInterface([]byte(str))
 			},
 		},
 	)
 	if err != nil {
 		return nil, err
 	}
-	err = script.Add("sprint", &tengo.UserFunction{
+	err = script.Add("__sprint__", &tengo.UserFunction{
 			Value: func(args ...tengo.Object) (tengo.Object, error){
 				gargs := make([]any, len(args))
 				for i := range gargs {
 					gargs[i] = tengo.ToInterface(args[i])
 				}
 				str := fmt.Sprint(gargs...)
-				return tengo.FromInterface(str)
+				return tengo.FromInterface([]byte(str))
 			},
 		},
 	)
 	if err != nil {
 		return nil, err
 	}
-	err = script.Add("sprintln", &tengo.UserFunction{
+	err = script.Add("__sprintln__", &tengo.UserFunction{
 			Value: func(args ...tengo.Object) (tengo.Object, error){
 				gargs := make([]any, len(args))
 				for i := range gargs {
 					gargs[i] = tengo.ToInterface(args[i])
 				}
 				str := fmt.Sprintln(gargs...)
-				return tengo.FromInterface(str)
+				return tengo.FromInterface([]byte(str))
 			},
 		},
 	)
 	if err != nil {
 		return nil, err
 	}
-	err = script.Add("__separate", &tengo.UserFunction{
+	err = script.Add("__separate__", &tengo.UserFunction{
 			Value: func(args ...tengo.Object) (tengo.Object, error){
 				if len(args) < 1 {
 					return nil, tengo.ErrWrongNumArguments
 				}
-				str, ok := tengo.ToByteSlice(args[0])
+				bts, ok := tengo.ToByteSlice(args[0])
 				if !ok {
 					return nil, tengo.ErrInvalidArgumentType{
 					}
 				}
-				rets = append(rets, str)
+				rets = append(rets, bts)
 				return nil, nil
 			},
 		},

tests/cat.jpg.tpp

@@ -0,0 +1,9 @@
+{{
+	// The example shows the way to write
+	// binary files
+	// so it makes possible to make templates
+	// for them or for dynamic content.
+	os := import("os")
+	bts := os.read_file("tests/cat.webp")
+	pp.write_raw(bts)
+}}

tests/index.md.pp

@@ -2,19 +2,19 @@
 	os := import("os")
 	shit := import("./tests/shit.tengo")
 	newVar := "'this is gen shita'"
-	println(shit.some_func())
+	pp.println(shit.some_func())
 }}# The index testing
-	1 + 1 = {{ print(1+1) }}
-	cock {{ print(newVar, "and cock") }}
+	1 + 1 = {{ pp.print(1+1) }}
+	cock {{ pp.print(newVar, "and cock") }}
 
 ## The shit after
 
-checking {{ printf(newVar) }}
+checking {{ pp.printf(newVar) }}
 
 ## File contents
 
 {{
 	bts := os.read_file("tests/somefile")
-	printf("%v\n%s", bts, bts)
+	pp.printf("%v\n%s", bts, bts)
 }}