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-- filename : l-io.lua
-- comment : split off from luat-lib
-- author : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license : see context related readme files
if not versions then versions = { } end versions['l-io'] = 1.001
if string.find(os.getenv("PATH"),";") then
io.fileseparator, io.pathseparator = "\\", ";"
else
io.fileseparator, io.pathseparator = "/" , ":"
end
function io.loaddata(filename)
local f = io.open(filename)
if f then
local data = f:read('*all')
f:close()
return data
else
return nil
end
end
function io.savedata(filename,data,joiner)
local f = io.open(filename, "wb")
if f then
if type(data) == "table" then
f:write(table.join(data,joiner or ""))
elseif type(data) == "function" then
data(f)
else
f:write(data)
end
f:close()
end
end
function io.exists(filename)
local f = io.open(filename)
if f == nil then
return false
else
assert(f:close())
return true
end
end
function io.size(filename)
local f = io.open(filename)
if f == nil then
return 0
else
local s = f:seek("end")
assert(f:close())
return s
end
end
function io.noflines(f)
local n = 0
for _ in f:lines() do
n = n + 1
end
f:seek('set',0)
return n
end
--~ t, f, n = os.clock(), io.open("testbed/sample-utf16-bigendian-big.txt",'rb'), 0
--~ for a in io.characters(f) do n = n + 1 end
--~ print(string.format("characters: %s, time: %s", n, os.clock()-t))
do
local nextchar = {
[ 4] = function(f)
return f:read(1), f:read(1), f:read(1), f:read(1)
end,
[ 2] = function(f)
return f:read(1), f:read(1)
end,
[ 1] = function(f)
return f:read(1)
end,
[-2] = function(f)
local a = f:read(1)
local b = f:read(1)
return b, a
end,
[-4] = function(f)
local a = f:read(1)
local b = f:read(1)
local c = f:read(1)
local c = f:read(1)
return d, c, b, a
end
}
function io.characters(f,n)
local sb = string.byte
if f then
return nextchar[n or 1], f
else
return nil, nil
end
end
end
do
local nextbyte = {
[4] = function(f)
local a = f:read(1)
local b = f:read(1)
local c = f:read(1)
local d = f:read(1)
if d then
return sb(a), sb(b), sb(c), sb(d)
else
return nil, nil, nil, nil
end
end,
[2] = function(f)
local a = f:read(1)
local b = f:read(1)
if b then
return sb(a), sb(b)
else
return nil, nil
end
end,
[1] = function (f)
local a = f:read(1)
if a then
return sb(a)
else
return nil
end
end,
[-2] = function (f)
local a = f:read(1)
local b = f:read(1)
if b then
return sb(b), sb(a)
else
return nil, nil
end
end,
[-4] = function(f)
local a = f:read(1)
local b = f:read(1)
local c = f:read(1)
local d = f:read(1)
if d then
return sb(d), sb(c), sb(b), sb(a)
else
return nil, nil, nil, nil
end
end
}
function io.bytes(f,n)
local sb = string.byte
if f then
return nextbyte[n or 1], f
else
return nil, nil
end
end
end
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