feat: implemented basic log package.

logx/main.go

@@ -0,0 +1,65 @@
+package logx
+
+import "github.com/d5/tengo/v2"
+import "log"
+
+var Module = map[string]tengo.Object{
+	"printf": &tengo.BuiltinFunction{
+		Name: "printf",
+		Value: func(
+			args ...tengo.Object,
+		) (tengo.Object, error) {
+			if len(args) < 1 {
+				return nil, tengo.ErrWrongNumArguments
+			}
+
+			formatObject := args[0]
+			format, hasFormat := tengo.ToString(
+				formatObject,
+			)
+			if !hasFormat {
+				return nil, tengo.ErrInvalidArgumentType{
+					Name: "first",
+					Expected: "string",
+					Found: formatObject.TypeName(),
+				}
+			}
+
+			v := make([]any, len(args[1:]))
+			for i, o := range args[1:] {
+				v[i] = tengo.ToInterface(o)
+			}
+
+			log.Printf(format, v...)
+
+			return nil, nil
+		},
+	},
+	"print": &tengo.BuiltinFunction{
+		Name: "print",
+		Value: func(
+			args ...tengo.Object,
+		) (tengo.Object, error){
+			v := make([]any, len(args))
+			for i, o := range args {
+				v[i] = tengo.ToInterface(o)
+			}
+			log.Print(v...)
+			return nil, nil
+		},
+	},
+	"println": &tengo.BuiltinFunction{
+		Name: "println",
+		Value: func(
+			args ...tengo.Object,
+		) (tengo.Object, error){
+			v := make([]any, len(args))
+			for i, o := range args {
+				v[i] = tengo.ToInterface(o)
+			}
+			log.Println(v...)
+			return nil, nil
+		},
+	},
+}
+

tests/cjson.xgo

@@ -1,9 +1,12 @@
 cjson := import("cjson")
 fmt := import("fmt")
-fmt.println(cjson.__check())
-
+log := import("log")
 dec := cjson.new_decoder("tests/data.cjson")
 
+log.print("cock")
+log.print("die")
+
+log.println("some log")
 for {
 	v := dec.decode()
 	if is_error(v) {
@@ -12,5 +15,6 @@ for {
 	if !v {
 		break
 	}
+	log.println("got one more value")
 	fmt.println(v)
 }

xtool/main.go

@@ -20,6 +20,7 @@ import (
 
 import "surdeus.su/core/cli/mtool"
 import "surdeus.su/core/xgo/cjson"
+import "surdeus.su/core/xgo/logx"
 
 const (
 	sourceFileExt = ".xgo"
@@ -54,6 +55,7 @@ func Run(flags *mtool.Flags) {
 	}
 	modules := stdlib.GetModuleMap(stdlib.AllModuleNames()...)
 	modules.AddBuiltinModule("cjson", cjson.Module)
+	modules.AddBuiltinModule("log", logx.Module)
 	if len(iargs) == 0 {
 		// REPL
 		RunREPL(modules, os.Stdin, os.Stdout)