New quirk: imports.sequencedlist

Closes #80

tosca/QUIRKS.md

@@ -13,6 +13,9 @@ These are activated via the `--quirk/-x` switch for
 * **imports.topology_template.ignore**: Allows imported units to contain a `topology_template`
   section, which is ignored.
 
+* **imports.sequencedlist**: Allows the "import" syntax to be a sequenced list, in which the
+  name is ignored.
+
 * **data_types.string.permissive**: By default Puccini is strict about "string"-typed values
   and will consider integers, floats, and boolean values to be problems. This quirk will accept
   such values and convert them as sensibly as possible to strings. This includes accepting floats
@@ -45,4 +48,3 @@ These are activated via the `--quirk/-x` switch for
 
 * **annotations.ignore**: Ignores the "annotation_types" keyword in service templates and the
   "annotations" keyword in parameter definitions.
-

tosca/grammars/tosca_v1_3/import.go

@@ -24,6 +24,18 @@ func ReadImport(context *tosca.Context) tosca.EntityPtr {
 	self := tosca_v2_0.NewImport(context)
 
 	if context.Is(ard.TypeMap) {
+		if context.HasQuirk(tosca.QuirkImportsSequencedList) {
+			map_ := context.Data.(ard.Map)
+			if len(map_) == 1 {
+				for _, data := range map_ {
+					if data_, ok := data.(ard.Map); ok {
+						context.Data = data_
+					}
+					break
+				}
+			}
+		}
+
 		// Long notation
 		context.ValidateUnsupportedFields(context.ReadFields(self))
 	} else if context.ValidateType(ard.TypeMap, ard.TypeString) {

tosca/grammars/tosca_v2_0/import.go

@@ -40,6 +40,18 @@ func ReadImport(context *tosca.Context) tosca.EntityPtr {
 	self := NewImport(context)
 
 	if context.Is(ard.TypeMap) {
+		if context.HasQuirk(tosca.QuirkImportsSequencedList) {
+			map_ := context.Data.(ard.Map)
+			if len(map_) == 1 {
+				for _, data := range map_ {
+					if data_, ok := data.(ard.Map); ok {
+						context.Data = data_
+					}
+					break
+				}
+			}
+		}
+
 		// Long notation
 		context.ValidateUnsupportedFields(context.ReadFields(self))
 	} else if context.ValidateType(ard.TypeMap, ard.TypeString) {

tosca/quirk.go

@@ -18,6 +18,10 @@ const QuirkImportsTopologyTemplateIgnore Quirk = "imports.topology_template.igno
 // another unit with an incompatible grammar. This quirk will disable the check.
 const QuirkImportsVersionPermissive Quirk = "imports.version.permissive"
 
+// Allows the "import" syntax to be a sequenced list, in which the
+// name is ignored.
+const QuirkImportsSequencedList Quirk = "imports.sequencedlist"
+
 // By default Puccini is strict about "string"-typed values
 // and will consider integers, floats, and boolean values to be problems. This quirk will accept
 // such values and convert them as sensibly as possible to strings. This includes accepting floats