1 files changed, 43 insertions, 0 deletions
diff --git a/hugolib/doctree/dimensions.go b/hugolib/doctree/dimensions.go
new file mode 100644
index 000000000..bcc3cae00
--- /dev/null
+++ b/hugolib/doctree/dimensions.go
@@ -0,0 +1,43 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package doctree
+
+const (
+	// Language is currently the only dimension in the Hugo build matrix.
+	DimensionLanguage DimensionFlag = 1 << iota
+)
+
+// Dimension is a row in the Hugo build matrix which currently has one value: language.
+type Dimension [1]int
+
+// DimensionFlag is a flag in the Hugo build matrix.
+type DimensionFlag byte
+
+// Has returns whether the given flag is set.
+func (d DimensionFlag) Has(o DimensionFlag) bool {
+	return d&o == o
+}
+
+// Set sets the given flag.
+func (d DimensionFlag) Set(o DimensionFlag) DimensionFlag {
+	return d | o
+}
+
+// Index returns this flag's index in the Dimensions array.
+func (d DimensionFlag) Index() int {
+	if d == 0 {
+		panic("dimension flag not set")
+	}
+	return int(d - 1)
+}