updated compile multiple style method

d2ast/keywords.go

@@ -64,10 +64,9 @@ var StyleKeywords = map[string]struct{}{
 	"text-transform": {},
 
 	// Only for shapes
-	"shadow":           {},
-	"multiple":         {},
-	"multiple.opacity": {},
-	"double-border":    {},
+	"shadow":        {},
+	"multiple":      {},
+	"double-border": {},
 
 	// Only for squares
 	"3d": {},
@@ -77,6 +76,10 @@ var StyleKeywords = map[string]struct{}{
 	"filled":   {},
 }
 
+var CompositeStyleKeywords = map[string]string{
+	"multiple": "opacity",
+}
+
 // TODO maybe autofmt should allow other values, and transform them to conform
 // e.g. left-center becomes center-left
 var NearConstantsArray = []string{

d2compiler/compile.go

@@ -760,8 +760,7 @@ func (c *compiler) compileStyleField(styles *d2graph.Style, f *d2ir.Field) {
 		fields := f.Map().Fields
 		for i := 0; i < len(fields); i++ {
 			field := fields[i]
-			field.Name.SetString(f.Name.ScalarString() + "." + field.Name.ScalarString())
-			c.compileStyleField(styles, field)
+			c.compileCompositeStyle(styles, field, f.Name.ScalarString())
 		}
 	}
 	if f.Primary() == nil {
@@ -776,6 +775,31 @@ func (c *compiler) compileStyleField(styles *d2graph.Style, f *d2ir.Field) {
 	}
 }
 
+func (c *compiler) compileCompositeStyle(styles *d2graph.Style, f *d2ir.Field, parent string) {
+	if _, ok := d2ast.CompositeStyleKeywords[strings.ToLower(parent)]; !(ok && f.Name.IsUnquoted()) {
+		c.errorf(f.LastRef().AST(), `invalid composite style keyword: "%s"`, f.Name.ScalarString())
+		return
+	}
+
+	allowedStyle := d2ast.CompositeStyleKeywords[strings.ToLower(parent)]
+
+	if allowedStyle != strings.ToLower(f.Name.ScalarString()) {
+		c.errorf(f.LastRef().AST(), `invalid style "%s" for composite style keyword: "%s"`, f.Name.ScalarString(), parent)
+	}
+
+	if f.Primary() == nil {
+		return
+	}
+
+	compileCompositeStyleFieldInit(styles, f, parent)
+	scalar := f.Primary().Value
+	err := styles.ApplyComposite(f.Name.ScalarString(), scalar.ScalarString(), parent)
+	if err != nil {
+		c.errorf(scalar, err.Error())
+		return
+	}
+}
+
 func compileStyleFieldInit(styles *d2graph.Style, f *d2ir.Field) {
 	switch f.Name.ScalarString() {
 	case "opacity":
@@ -798,8 +822,6 @@ func compileStyleFieldInit(styles *d2graph.Style, f *d2ir.Field) {
 		styles.ThreeDee = &d2graph.Scalar{MapKey: f.LastPrimaryKey()}
 	case "multiple":
 		styles.Multiple = &d2graph.Scalar{MapKey: f.LastPrimaryKey()}
-	case "multiple.opacity":
-		styles.MultipleOpacity = &d2graph.Scalar{MapKey: f.LastPrimaryKey()}
 	case "font":
 		styles.Font = &d2graph.Scalar{MapKey: f.LastPrimaryKey()}
 	case "font-size":
@@ -823,6 +845,15 @@ func compileStyleFieldInit(styles *d2graph.Style, f *d2ir.Field) {
 	}
 }
 
+func compileCompositeStyleFieldInit(styles *d2graph.Style, f *d2ir.Field, parent string) {
+	switch f.Name.ScalarString() {
+	case "opacity":
+		if parent == "multiple" {
+			styles.MultipleOpacity = &d2graph.Scalar{MapKey: f.LastPrimaryKey()}
+		}
+	}
+}
+
 func (c *compiler) compileEdge(obj *d2graph.Object, e *d2ir.Edge) {
 	edge, err := obj.Connect(e.ID.SrcPath, e.ID.DstPath, e.ID.SrcArrow, e.ID.DstArrow, "")
 	if err != nil {

d2graph/d2graph.go

@@ -400,15 +400,6 @@ func (s *Style) Apply(key, value string) error {
 			return errors.New(`expected "multiple" to be true or false`)
 		}
 		s.Multiple.Value = value
-	case "multiple.opacity":
-		if s.MultipleOpacity == nil {
-			break
-		}
-		f, err := strconv.ParseFloat(value, 64)
-		if err != nil || (f < 0 || f > 1) {
-			return errors.New(`expected "opacity" to be a number between 0.0 and 1.0`)
-		}
-		s.MultipleOpacity.Value = value
 	case "font":
 		if s.Font == nil {
 			break
@@ -503,6 +494,25 @@ func (s *Style) Apply(key, value string) error {
 	return nil
 }
 
+func (s *Style) ApplyComposite(key, value, parent string) error {
+	switch key {
+	case "opacity":
+		f, err := strconv.ParseFloat(value, 64)
+		if err != nil || (f < 0 || f > 1) {
+			return errors.New(`expected "opacity" to be a number between 0.0 and 1.0`)
+		}
+		if parent == "multiple" {
+			if s.MultipleOpacity == nil {
+				break
+			}
+			s.MultipleOpacity.Value = value
+		}
+	default:
+		return fmt.Errorf("unknown style key: %s", key)
+	}
+	return nil
+}
+
 type ContainerLevel int
 
 func (l ContainerLevel) LabelSize() int {