Organize backend into product executable and shared Go modules

backend/shared/database/internal/builder/field.go

@@ -0,0 +1,71 @@
+package builderimp
+
+import (
+	"strings"
+
+	"git.sendico.io/tech/sxchnge/shared/database/repository/builder"
+)
+
+type FieldImp struct {
+	fields []string
+}
+
+func (b *FieldImp) Dot(field string) builder.Field {
+	newFields := make([]string, len(b.fields), len(b.fields)+1)
+	copy(newFields, b.fields)
+	newFields = append(newFields, field)
+	return &FieldImp{fields: newFields}
+}
+
+func (b *FieldImp) CopyWith(field string) builder.Field {
+	copiedFields := make([]string, 0, len(b.fields)+1)
+	copiedFields = append(copiedFields, b.fields...)
+	copiedFields = append(copiedFields, field)
+	return &FieldImp{
+		fields: copiedFields,
+	}
+}
+
+func (b *FieldImp) Build() string {
+	return strings.Join(b.fields, ".")
+}
+
+func NewFieldImp(baseName string) builder.Field {
+	return &FieldImp{
+		fields: []string{baseName},
+	}
+}
+
+type RefField struct {
+	imp builder.Field
+}
+
+func (b *RefField) Build() string {
+	return "$" + b.imp.Build()
+}
+
+func (b *RefField) CopyWith(field string) builder.Field {
+	return &RefField{
+		imp: b.imp.CopyWith(field),
+	}
+}
+
+func (b *RefField) Dot(field string) builder.Field {
+	return &RefField{
+		imp: b.imp.Dot(field),
+	}
+}
+
+func NewRefFieldImp(field builder.Field) builder.Field {
+	return &RefField{
+		imp: field,
+	}
+}
+
+func NewRootRef() builder.Field {
+	return NewFieldImp("$$ROOT")
+}
+
+func NewRemoveRef() builder.Field {
+	return NewFieldImp("$$REMOVE")
+}