// 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)
}