--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/github.com/yosssi/gcss/element_base.go	Sun Jul 23 13:18:53 2023 +0000
@@ -0,0 +1,104 @@
+package gcss
+
+import (
+	"bytes"
+	"io"
+)
+
+// elementBase holds the common fields of an element.
+type elementBase struct {
+	ln     *line
+	parent element
+	sels   []*selector
+	decs   []*declaration
+	mixins []*mixinInvocation
+	ctx    *context
+}
+
+// AppendChild appends a child element to the element.
+func (eBase *elementBase) AppendChild(child element) {
+	switch c := child.(type) {
+	case *mixinInvocation:
+		eBase.mixins = append(eBase.mixins, c)
+	case *declaration:
+		eBase.decs = append(eBase.decs, c)
+	case *selector:
+		eBase.sels = append(eBase.sels, c)
+	}
+}
+
+// Base returns the element base.
+func (eBase *elementBase) Base() *elementBase {
+	return eBase
+}
+
+// SetContext sets the context to the element.
+func (eBase *elementBase) SetContext(ctx *context) {
+	eBase.ctx = ctx
+}
+
+// Context returns the top element's context.
+func (eBase *elementBase) Context() *context {
+	if eBase.parent != nil {
+		return eBase.parent.Context()
+	}
+
+	return eBase.ctx
+}
+
+// hasMixinDecs returns true if the element has a mixin
+// which has declarations.
+func (eBase *elementBase) hasMixinDecs() bool {
+	for _, mi := range eBase.mixins {
+		if decs, _ := mi.decsParams(); len(decs) > 0 {
+			return true
+		}
+	}
+
+	return false
+}
+
+// hasMixinSels returns true if the element has a mixin
+// which has selectors.
+func (eBase *elementBase) hasMixinSels() bool {
+	for _, mi := range eBase.mixins {
+		if sels, _ := mi.selsParams(); len(sels) > 0 {
+			return true
+		}
+	}
+
+	return false
+}
+
+// writeDecsTo writes the element's declarations to w.
+func (eBase *elementBase) writeDecsTo(w io.Writer, params map[string]string) (int64, error) {
+	bf := new(bytes.Buffer)
+
+	// Write the declarations.
+	for _, dec := range eBase.decs {
+		// Writing to the bytes.Buffer never returns an error.
+		dec.writeTo(bf, params)
+	}
+
+	// Write the mixin's declarations.
+	for _, mi := range eBase.mixins {
+		decs, prms := mi.decsParams()
+
+		for _, dec := range decs {
+			// Writing to the bytes.Buffer never returns an error.
+			dec.writeTo(bf, prms)
+		}
+	}
+
+	n, err := w.Write(bf.Bytes())
+
+	return int64(n), err
+}
+
+// newElementBase creates and returns an element base.
+func newElementBase(ln *line, parent element) elementBase {
+	return elementBase{
+		ln:     ln,
+		parent: parent,
+	}
+}