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-----------------------------------------------------------------------
-- FILE: xindex-baselib.lua
-- DESCRIPTION: baselibrary for xindex.lua
-- REQUIREMENTS:
-- AUTHOR: Herbert Voß
-- LICENSE: LPPL1.3
--
-- $Id: xindex-baselib.lua 22 2022-02-07 12:18:15Z hvoss $
-----------------------------------------------------------------------
if not modules then modules = { } end modules ['xindex-baselib'] = {
version = 0.41,
comment = "base library to xindex.lua",
author = "Herbert Voss",
copyright = "Herbert Voss",
license = "LPPL 1.3"
}
function dofile(filename)
local file = kpse.find_file(filename)
local f = assert(loadfile(file))
return f()
end
-- see if the file exists
function file_exists(file)
local f = io.open(file, "rb")
if f then f:close() end
return f ~= nil
end
function array_concat(...)
local t = {}
for n = 1,select("#",...) do
local arg = select(n,...)
if type(arg)=="table" then
for _,v in ipairs(arg) do
t[#t+1] = v
end
else
t[#t+1] = arg
end
end
return t
end
function IntegerOrString(str)
local x = tonumber(str)
if x == nil -- true, if str contains _not_ only digits -> integer
then return str
else return x
end
end
function getPathFileExt(str)
local filepath = str:match("(.*[/\\])")
local filename = str:match("^.+/(.+)$")
local fileext = str:match("^.+(%..+)$")
return filepath,filename,fileext
end
local romanMap = {
I = 1,
V = 5,
X = 10,
L = 50,
C = 100,
D = 500,
M = 1000,
}
local numbers = { 1, 5, 10, 50, 100, 500, 1000 }
local romanchars = { "I", "V", "X", "L", "C", "D", "M" }
local RomanNumerals = { }
function numberToRoman(s)
--s = tostring(s)
s = tonumber(s)
if not s or s ~= s then error"Unable to convert to number" end
if s == math.huge then error"Unable to convert infinity" end
s = math.floor(s)
if s <= 0 then return s end
local ret = ""
for i = #numbers, 1, -1 do
local num = numbers[i]
while s - num >= 0 and s > 0 do
ret = ret .. romanchars[i]
s = s - num
end
for j = 1, i - 1 do
local n2 = numbers[j]
if s - (num - n2) >= 0 and s < num and s > 0 and num - n2 ~= n2 then
ret = ret .. romanchars[j] .. romanchars[i]
s = s - (num - n2)
break
end
end
end
return ret
end
function romanToNumber(s)
-- if args_v then print("romanToNumber: "..tostring(s)) end
-- if not s then return end
s = s:upper()
local ret = 0
local i = 1
while i <= s:len() do
local c = s:sub(i, i)
if c ~= " " then -- allow spaces
local m = romanMap[c]
if not m then return nil end --error("Unknown Roman Numeral '" .. c .. "'")
local next = s:sub(i + 1, i + 1)
local nextm = romanMap[next]
if next and nextm then
if nextm > m then
ret = ret + (nextm - m)
i = i + 1
else
ret = ret + m
end
else
ret = ret + m
end
end
i = i + 1
end
return ret
end
function toNumber(s) -- number as string or a roman number to arabic number
if s == nil then return s end
if type(s) == "number" then return s end -- it is already a number
local rnum = romanToNumber(s) -- check if roman
if rnum then return rnum end -- if yes, return converted roman
return tonumber(s) -- return string to number
end
--[[
function string:split()
local sep, fields = " ", {}
local pattern = string.format("([^%s]+)", sep)
self:gsub(pattern, function(c) fields[#fields+1] = c end)
return fields
end
]]
function string:split(s)
local D
if not s then
D = '%s'
else
D = tostring(s)
end
local sep, fields = " ", {}
local pattern = string.format("([^"..D.."]+)", sep)
self:gsub(pattern, function(c) fields[#fields+1] = c end)
return fields
end
function shellsort(a)
local inc = math.ceil( #a / 2 )
while inc > 0 do
for i = inc, #a do
local tmp = a[i]
local j = i
while j > inc and not UTFCompare(a[j-inc],tmp) do
a[j] = a[j-inc]
j = j - inc
end
a[j] = tmp
end
inc = math.floor( 0.5 + inc / 2.2 )
end
return a
end
function stripLeadingSpaces(str)
return str:gsub("^%s*(.-)%s*$", "%1")
end
|
