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988f2e3290
Create a spreadsheet/reference package and put these functions there. This prevents both duplication across the formula & spreadsheet packages and a cyclic reference.
42 lines
975 B
Go
42 lines
975 B
Go
// Copyright 2017 Baliance. All rights reserved.
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//
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// Use of this source code is governed by the terms of the Affero GNU General
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// Public License version 3.0 as published by the Free Software Foundation and
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// appearing in the file LICENSE included in the packaging of this file. A
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// commercial license can be purchased by contacting sales@baliance.com.
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package reference
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import (
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"strings"
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)
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// ColumnToIndex maps a column to a zero based index (e.g. A = 0, B = 1, AA = 26)
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func ColumnToIndex(col string) uint32 {
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col = strings.ToUpper(col)
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res := uint32(0)
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for _, c := range col {
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res *= 26
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res += uint32(c - 'A' + 1)
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}
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return res - 1
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}
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// IndexToColumn maps a column number to a coumn name (e.g. 0 = A, 1 = B, 26 = AA)
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func IndexToColumn(col uint32) string {
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var a [64 + 1]byte
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i := len(a)
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u := col
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const b = 26
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for u >= b {
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i--
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q := u / b
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a[i] = byte('A' + uint(u-q*b))
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u = q - 1
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}
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i--
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a[i] = byte('A' + uint(u))
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return string(a[i:])
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}
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