Sha256: 962ff2f854ca40cc1d69bdcb318ecca2924ce49fb907a4ac91946b3685c35739
Contents?: true
Size: 791 Bytes
Versions: 42
Compression:
Stored size: 791 Bytes
Contents
# -*- coding: utf-8 -*-
require 'singleton'
class ColName
include Singleton
def initialize
@col_str_table = Hash.new
end
def col_str(col)
@col_str_table[col] = col_str_build(col) unless @col_str_table[col]
@col_str_table[col]
end
private
def col_str_build(col)
# Change from 0-indexed to 1 indexed.
col = col.to_i + 1
col_str = ''
while col > 0
# Set remainder from 1 .. 26
remainder = col % 26
remainder = 26 if remainder == 0
# Convert the remainder to a character. C-ishly.
col_letter = ("A".ord + remainder - 1).chr
# Accumulate the column letters, right to left.
col_str = col_letter + col_str
# Get the next order of magnitude.
col = (col - 1) / 26
end
col_str
end
end
Version data entries
42 entries across 42 versions & 1 rubygems