50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
package utils
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import (
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"errors"
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"fmt"
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"strconv"
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)
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const TotalRows = 1048576
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const MinColumns = 1
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const MaxColumns = 16384
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// ColumnNumberToName provides a function to convert the integer to Excel
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// sheet column title.
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//
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// Example:
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//
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// excelize.ColumnNumberToName(37) // returns "AK", nil
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func ColumnNumberToName(num int) (string, error) {
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if num < MinColumns || num > MaxColumns {
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return "", fmt.Errorf("the column number must be greater than or equal to %d and less than or equal to %d", MinColumns, MaxColumns)
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}
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var col string
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for num > 0 {
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col = string(rune((num-1)%26+65)) + col
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num = (num - 1) / 26
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}
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return col, nil
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}
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// CoordinatesToCellName converts [X, Y] coordinates to alpha-numeric cell
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// name or returns an error.
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//
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// Example:
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//
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// excelize.CoordinatesToCellName(1, 1) // returns "A1", nil
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// excelize.CoordinatesToCellName(1, 1, true) // returns "$A$1", nil
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func CoordinatesToCellName(col, row int, abs ...bool) (string, error) {
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if col < 1 || row < 1 {
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return "", errors.New("col row < 0")
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}
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if row > TotalRows {
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return "", errors.New("row number exceeds maximum limit")
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}
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colName, err := ColumnNumberToName(col)
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return colName + strconv.Itoa(row), err
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}
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