Fixed a number of bugs

- Fixed the non-opaque slice and struct types returned from builtins as pointers to be returned from eval as pointers
- Fixed syntax problems with empty blocks that contain new-lines

ucl/ast.go

@@ -40,8 +40,8 @@ type astListOrHash struct {
 }
 
 type astBlock struct {
-	Names      []string         `parser:"LC NL? (PIPE @Ident+ PIPE NL?)?"`
-	Statements []*astStatements `parser:"@@ NL? RC"`
+	Names      []string         `parser:"LC NL* (PIPE @Ident+ PIPE NL*)?"`
+	Statements []*astStatements `parser:"@@? NL* RC"`
 }
 
 type astMaybeSub struct {

ucl/objs.go

@@ -141,9 +141,9 @@ func toGoValue(obj object) (interface{}, bool) {
 	case proxyObject:
 		return v.p, true
 	case listableProxyObject:
-		return v.v.Interface(), true
+		return v.orig.Interface(), true
 	case structProxyObject:
-		return v.v.Interface(), true
+		return v.orig.Interface(), true
 	}
 
 	return nil, false
@@ -171,10 +171,17 @@ func fromGoReflectValue(resVal reflect.Value) (object, error) {
 
 	switch resVal.Kind() {
 	case reflect.Slice:
-		return listableProxyObject{resVal}, nil
+		return listableProxyObject{v: resVal, orig: resVal}, nil
 	case reflect.Struct:
-		return newStructProxyObject(resVal), nil
+		return newStructProxyObject(resVal, resVal), nil
 	case reflect.Pointer:
+		switch resVal.Elem().Kind() {
+		case reflect.Slice:
+			return listableProxyObject{v: resVal.Elem(), orig: resVal}, nil
+		case reflect.Struct:
+			return newStructProxyObject(resVal.Elem(), resVal), nil
+		}
+
 		return fromGoReflectValue(resVal.Elem())
 	}
 
@@ -400,6 +407,7 @@ func (p proxyObject) Truthy() bool {
 
 type listableProxyObject struct {
 	v    reflect.Value
+	orig reflect.Value
 }
 
 func (p listableProxyObject) String() string {
@@ -424,12 +432,14 @@ func (p listableProxyObject) Index(i int) object {
 
 type structProxyObject struct {
 	v    reflect.Value
+	orig reflect.Value
 	vf   []reflect.StructField
 }
 
-func newStructProxyObject(v reflect.Value) structProxyObject {
+func newStructProxyObject(v reflect.Value, orig reflect.Value) structProxyObject {
 	return structProxyObject{
 		v:    v,
+		orig: orig,
 		vf:   slices.Filter(reflect.VisibleFields(v.Type()), func(t reflect.StructField) bool { return t.IsExported() }),
 	}
 }

ucl/testbuiltins_test.go

@@ -389,6 +389,36 @@ func TestBuiltins_Return(t *testing.T) {
 		expr string
 		want string
 	}{
+		// syntax tests
+		{desc: "empty proc 1", expr: `
+			proc greet {}
+			greet
+		`, want: "(nil)\n"},
+		{desc: "empty proc 2", expr: `
+			proc greet {
+			}
+
+			greet
+		`, want: "(nil)\n"},
+		{desc: "empty proc 3", expr: `
+			proc greet {
+
+
+			}
+
+			greet
+		`, want: "(nil)\n"},
+		{desc: "empty proc 4", expr: `
+			proc greet {
+				# bla
+				
+				# di
+				# bla!
+			}
+
+			greet
+		`, want: "(nil)\n"},
+
 		{desc: "nil return", expr: `
 			proc greet {
 				echo "Hello"
@@ -398,6 +428,27 @@ func TestBuiltins_Return(t *testing.T) {
 
 			greet
 			`, want: "Hello\n(nil)\n"},
+
+		{desc: "simple arg 1", expr: `
+			proc greet { |x|
+				return (cat "Hello, " $x)
+			}
+
+			greet "person"
+			`, want: "Hello, person\n"},
+		{desc: "simple arg 2", expr: `
+			proc greet { 
+				# This will greet someone
+				# here are the args:
+				|x|
+
+				# And here is the code
+				return (cat "Hello, " $x)
+			}
+
+			greet "person"
+			`, want: "Hello, person\n"},
+
 		{desc: "simple return", expr: `
 			proc greet {
 				return "Hello, world"
@@ -406,6 +457,7 @@ func TestBuiltins_Return(t *testing.T) {
 
 			greet
 			`, want: "Hello, world\n"},
+
 		{desc: "only return current frame", expr: `
 			proc greetWhat {
 				echo "Greet the"

ucl/userbuiltin_test.go

@@ -3,6 +3,7 @@ package ucl_test
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 	"testing"
@@ -113,6 +114,27 @@ func TestInst_SetBuiltin(t *testing.T) {
 		assert.Equal(t, pair{"Hello", "World"}, res)
 	})
 
+	t.Run("builtin return proxy object ptr", func(t *testing.T) {
+		type pair struct {
+			x, y string
+		}
+
+		inst := ucl.New()
+		inst.SetBuiltin("add2", func(ctx context.Context, args ucl.CallArgs) (any, error) {
+			var x, y string
+
+			if err := args.Bind(&x, &y); err != nil {
+				return nil, err
+			}
+
+			return &pair{x, y}, nil
+		})
+
+		res, err := inst.Eval(context.Background(), `add2 "Hello" "World"`)
+		assert.NoError(t, err)
+		assert.Equal(t, &pair{"Hello", "World"}, res)
+	})
+
 	t.Run("builtin operating on and returning proxy object", func(t *testing.T) {
 		type pair struct {
 			x, y string
@@ -235,10 +257,12 @@ func TestInst_SetBuiltin(t *testing.T) {
 			descr   string
 			expr    string
 			want    opaqueThingType
+			wantErr bool
 		}{
 			{descr: "return as is", expr: `getOpaque`, want: *opaqueThing},
 			{descr: "update pointer 1", expr: `set x (getOpaque) ; setProp $x -x "do" -y "touch" -z "this"`, want: opaqueThingType{x: "do", y: "touch", z: "this"}},
 			{descr: "update pointer 2", expr: `set x (getOpaque) ; setProp $x -x "yes" ; setProp $x -y "this" -z "too"`, want: opaqueThingType{x: "yes", y: "this", z: "too"}},
+			{descr: "bad args", expr: `set x (getOpaque) ; setProp $t -x "yes" ; setProp $bla -y "this" -z "too"`, want: *opaqueThing, wantErr: true},
 		}
 
 		for _, tt := range tests {
@@ -255,6 +279,8 @@ func TestInst_SetBuiltin(t *testing.T) {
 
 					if err := args.Bind(&o); err != nil {
 						return nil, err
+					} else if o == nil {
+						return nil, errors.New("is nil")
 					}
 
 					if args.HasSwitch("x") {
@@ -277,8 +303,12 @@ func TestInst_SetBuiltin(t *testing.T) {
 				})
 
 				_, err := inst.Eval(context.Background(), tt.expr)
+				if tt.wantErr {
+					assert.Error(t, err)
+				} else {
 					assert.NoError(t, err)
 					assert.Equal(t, tt.want, *opaqueThing)
+				}
 			})
 		}
 	})