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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
local map = require('acf.util').map
local up = {}
wildcard = {}
local special = {['..']=up, ['*']=wildcard}
function is_absolute(path)
return string.sub(path, 1, 1) == '/'
end
function escape(comp)
for symbol, item in pairs(special) do
if comp == item then return symbol end
end
if type(comp) == 'number' then return tostring(comp) end
local res = string.gsub(comp, '([\\/])', '\\%1')
return (special[res] or tonumber(res)) and '\\'..res or res
end
function rawjoin(p1, p2, ...)
if not p2 then return p1 end
if not is_absolute(p2) then p2 = '/'..p2 end
return rawjoin((p1 == '/' and '' or p1)..p2, ...)
end
function join(parent, ...)
return rawjoin(parent, unpack(map(escape, {...})))
end
function split(path)
local res = {}
local comp = ''
local escaped
local function merge(s)
if s > '' then
table.insert(res, not escaped and (special[s] or tonumber(s)) or s)
end
end
while true do
local prefix, sep, suffix = string.match(path, '([^\\/]*)([\\/])(.*)')
if not prefix then
merge(comp..path)
return res
end
comp = comp..prefix
if sep == '\\' then
comp = comp..string.sub(suffix, 1, 1)
escaped = true
path = string.sub(suffix, 2, -1)
else
merge(comp)
comp = ''
escaped = false
path = suffix
end
end
end
function is_unique(path)
for _, comp in ipairs(split(path)) do
if comp == wildcard then return false end
end
return true
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] == up 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 join('/', unpack(comps))
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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