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--[[
Modify Leptonica's *.c file functions returning
"0 if OK, 1 on error" to use the l_ok typedef.
--]]
debug = false
---
-- copy a file src to dst
-- \param src source filename
-- \param dst destination filename
-- \param blocksize block size for copying (default 1M)
-- \return true on success; nil,error on error
function copyfile(src, dst, blocksize)
blocksize = blocksize or 1024*1024
local fs, fd, err
-- return after closing the file descriptors
local function ret(...)
if fs then fs:close() end
if fd then fd:close() end
return ...
end
fs, err = io.open(src)
if not fs then return ret(nil, err) end
fd, err = io.open(dst, "wb")
if not fd then return ret(nil, err) end
while true do
local ok, data
data = fs:read(blocksize)
if not data then break end
ok, err = fd:write(data)
if not ok then return ret(nil, err) end
end
return ret(true)
end
---
-- List the array table (t) contents to fd.
-- \param fd io file descriptor
-- \param t array table to list
function list(fd, t)
if t ~= nil then
for _,l in ipairs(t) do
fd:write(l .. '\n')
end
end
end
---
--- Modify the file fs and write the result to fd.
-- \param fs source file stream
-- \param fd destination file stream
-- \return true on success
function modify(fs, fd)
local state = 0 -- parsing state
local to_l_ok = false -- true, if the l_int32 return type should be changed
local b_file = false -- true, have seen a \file comment
while true do
line = fs:read()
if line == nil then
-- end of file
break
end
if line:match('^/%*[!*]$') then
-- start of Doxygen comment
-- introduces a new function
-- go to state 1 (inside doxygen comment)
state = 1
end
if state == 3 then
-- 2nd line after a comment
-- contains the name of the function
-- go to state 4 (skip until end of function)
state = 4
end
if state == 2 then
-- 1st line after a comment
-- contains the return type
if to_l_ok and line == 'l_int32' then
line = 'l_ok'
end
if b_file then
-- back to state 0 (look for doxygen comment)
state = 0
to_l_ok = false
b_file = false
else
-- go to state 3 (2nd line after doxygen comment)
state = 3
end
end
if line == ' */' then
-- end of Doxygen comment
-- go to state 2 (1st line after doxygen comment)
state = 2
end
if state == 1 then
-- inside doxygen comment
if line:match("%\\return%s+0 if OK") then
-- magic words that indicate l_ok return type
to_l_ok = true
end
if line:match("%\\file%s+") then
-- this is a file comment
b_file = true
end
end
if debug then
if to_l_ok then
print("[" .. state .. ";1] " .. line)
else
print("[" .. state .. ";0] " .. line)
end
end
if state == 4 and line == '}' then
-- end of a function
-- print("name='" .. name .. "'")
-- back to state 0 (look for doxygen comment)
state = 0
to_l_ok = false
b_file = false
end
fd:write(line .. '\n')
end
return true
end
---
-- Main function.
-- \param arg table array of command line parameters
script = arg[0] or ""
if #arg < 1 then
print("Usage: lua " .. script .." src/*.c")
end
for i = 1, #arg do
local input = arg[i]
local backup = input .. "~"
local ok, err = copyfile(input, backup)
if not ok then
print("Error copying " .. input .." to " .. backup .. ": " ..err)
end
local fs = io.open(backup)
local fd = io.open(input, "wb")
modify(fs, fd)
fd:close()
fs:close()
end
|
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