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--[[
Copyright (c) 2012 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
require 'stringy'
local function filter(func, tbl)
local res = {}
for k, v in pairs(tbl) do if func(v) then res[k] = v end end
return res
end
function is_absolute(path)
return string.sub(path, 1, 1) == '/'
end
function to_absolute(path, base)
if not is_absolute(path) then
path = base..(base ~= '/' and '/' or '')..path
end
local comps = split(path)
local i = 1
while i <= #comps do
if comps[i] == '..' then
if i == 1 then error('Invalid path: '..path) end
table.remove(comps, i - 1)
table.remove(comps, i - 1)
i = i - 1
else i = i + 1 end
end
return '/'..table.concat(comps, '/')
end
function join(p1, p2, ...)
if not p2 then return p1 end
if not is_absolute(p2) then p2 = '/'..p2 end
return join((p1 == '/' and '' or p1)..p2, unpack(arg))
end
function split(path)
-- assume absolute paths
assert(is_absolute(path))
if path == '/' then return {} end
return filter(function(s) return s > '' end,
stringy.split(string.sub(path, 2, -1), '/'))
end
function parent(path)
local comps = split(path)
table.remove(comps)
return join('/', unpack(comps))
end
function name(path)
local comps = split(path)
return comps[#comps]
end
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