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|
--
-- This is file `mcb.lua',
-- generated with the docstrip utility.
--
-- The original source files were:
--
-- luatexbase-mcb.dtx (with options: `lua')
--
-- Copyright (C) 2009 by Elie Roux <elie.roux@telecom-bretagne.eu>
--
-- This work is under the CC0 license.
-- See source file 'luatexbase-mcb.dtx' for details.
--
module('luatexbase', package.seeall)
luatexbase.provides_module({
name = "luamcallbacks",
version = 0.2,
date = "2010/05/12",
description = "register several functions in a callback",
author = "Hans Hagen, Elie Roux and Manuel P^^c3^^a9gourie-Gonnard",
copyright = "Hans Hagen, Elie Roux and Manuel P^^c3^^a9gourie-Gonnard",
license = "CC0",
})
local log = log or function(...)
luatexbase.module_log('luamcallbacks', string.format(...))
end
local info = info or function(...)
luatexbase.module_info('luamcallbacks', string.format(...))
end
local warning = warning or function(...)
luatexbase.module_warning('luamcallbacks', string.format(...))
end
local err = err or function(...)
luatexbase.module_error('luamcallbacks', string.format(...))
end
local callbacklist = callbacklist or { }
local lua_callbacks_defaults = { }
local list = 1
local data = 2
local first = 3
local simple = 4
local callbacktypes = callbacktypes or {
buildpage_filter = simple,
token_filter = first,
pre_output_filter = list,
hpack_filter = list,
process_input_buffer = data,
mlist_to_hlist = list,
vpack_filter = list,
define_font = first,
open_read_file = first,
linebreak_filter = list,
post_linebreak_filter = list,
pre_linebreak_filter = list,
start_page_number = simple,
stop_page_number = simple,
start_run = simple,
show_error_hook = simple,
stop_run = simple,
hyphenate = simple,
ligaturing = simple,
kerning = data,
find_write_file = first,
find_read_file = first,
find_vf_file = data,
find_map_file = data,
find_format_file = data,
find_opentype_file = data,
find_output_file = data,
find_truetype_file = data,
find_type1_file = data,
find_data_file = data,
find_pk_file = data,
find_font_file = data,
find_image_file = data,
find_ocp_file = data,
find_sfd_file = data,
find_enc_file = data,
read_sfd_file = first,
read_map_file = first,
read_pk_file = first,
read_enc_file = first,
read_vf_file = first,
read_ocp_file = first,
read_opentype_file = first,
read_truetype_file = first,
read_font_file = first,
read_type1_file = first,
read_data_file = first,
}
if luatexbase.luatexversion > 42 then
callbacktypes["process_output_buffer"] = data
end
local internalregister = internalregister or callback.register
local function str_to_type(str)
if str == 'list' then
return list
elseif str == 'data' then
return data
elseif str == 'first' then
return first
elseif str == 'simple' then
return simple
else
return nil
end
end
-- local
function listhandler (name)
return function(head,...)
local l = callbacklist[name]
if l then
local done = true
for _, f in ipairs(l) do
-- the returned value is either true or a new head plus true
rtv1, rtv2 = f.func(head,...)
if type(rtv1) == 'boolean' then
done = rtv1
elseif type (rtv1) == 'userdata' then
head = rtv1
end
if type(rtv2) == 'boolean' then
done = rtv2
elseif type(rtv2) == 'userdata' then
head = rtv2
end
if done == false then
err("function \"%s\" returned false in callback '%s'",
f.description, name)
end
end
return head, done
else
return head, false
end
end
end
local function datahandler (name)
return function(data,...)
local l = callbacklist[name]
if l then
for _, f in ipairs(l) do
data = f.func(data,...)
end
end
return data
end
end
local function firsthandler (name)
return function(...)
local l = callbacklist[name]
if l then
local f = l[1].func
return f(...)
else
return nil, false
end
end
end
local function simplehandler (name)
return function(...)
local l = callbacklist[name]
if l then
for _, f in ipairs(l) do
f.func(...)
end
end
end
end
function add_to_callback (name,func,description,priority)
if type(func) ~= "function" then
err("unable to add function, no proper function passed")
return
end
if not name or name == "" then
err("unable to add function, no proper callback name passed")
return
elseif not callbacktypes[name] then
err("unable to add function, '%s' is not a valid callback", name)
return
end
if not description or description == "" then
err("unable to add function to '%s', no proper description passed",
name)
return
end
if priority_in_callback(name, description) ~= 0 then
warning("function '%s' already registered in callback '%s'",
description, name)
end
local l = callbacklist[name]
if not l then
l = {}
callbacklist[name] = l
if not lua_callbacks_defaults[name] then
if callbacktypes[name] == list then
internalregister(name, listhandler(name))
elseif callbacktypes[name] == data then
internalregister(name, datahandler(name))
elseif callbacktypes[name] == simple then
internalregister(name, simplehandler(name))
elseif callbacktypes[name] == first then
internalregister(name, firsthandler(name))
else
err("unknown callback type")
end
end
end
local f = {
func = func,
description = description,
}
priority = tonumber(priority)
if not priority or priority > #l then
priority = #l+1
elseif priority < 1 then
priority = 1
end
if callbacktypes[name] == first and (priority ~= 1 or #l ~= 0) then
warning("several callbacks registered in callback '%s', "
.."only the first function will be active.", name)
end
table.insert(l,priority,f)
log("inserting function '%s' at position %s in callback list for '%s'",
description, priority, name)
end
function remove_from_callback (name, description)
if not name or name == "" then
err("unable to remove function, no proper callback name passed")
return
elseif not callbacktypes[name] then
err("unable to remove function, '%s' is not a valid callback", name)
return
end
if not description or description == "" then
err(
"unable to remove function from '%s', no proper description passed",
name)
return
end
local l = callbacklist[name]
if not l then
err("no callback list for '%s'",name)
return
end
for k,v in ipairs(l) do
if v.description == description then
table.remove(l,k)
log("removing function '%s' from '%s'",description,name)
if not next(l) then
callbacklist[name] = nil
if not lua_callbacks_defaults[name] then
internalregister(name, nil)
end
end
return
end
end
warning("unable to remove function '%s' from '%s'",description,name)
end
function reset_callback (name)
if not name or name == "" then
err("unable to reset, no proper callback name passed")
return
elseif not callbacktypes[name] then
err("reset error, '%s' is not a valid callback", name)
return
end
if not lua_callbacks_defaults[name] then
internalregister(name, nil)
end
local l = callbacklist[name]
if l then
log("resetting callback list '%s'",name)
callbacklist[name] = nil
end
end
function create_callback(name, ctype, default)
if not name then
err("unable to call callback, no proper name passed", name)
return nil
end
if not ctype or not default then
err("unable to create callback '%s': "
.."callbacktype or default function not specified", name)
return nil
end
if callbacktypes[name] then
err("unable to create callback '%s', callback already exists", name)
return nil
end
local temp = str_to_type(ctype)
if not temp then
err("unable to create callback '%s', type '%s' undefined", name, ctype)
return nil
end
ctype = temp
lua_callbacks_defaults[name] = default
callbacktypes[name] = ctype
end
function call_callback(name, ...)
if not name then
err("unable to call callback, no proper name passed", name)
return nil
end
if not lua_callbacks_defaults[name] then
err("unable to call lua callback '%s', unknown callback", name)
return nil
end
local l = callbacklist[name]
local f
if not l then
f = lua_callbacks_defaults[name]
else
if callbacktypes[name] == list then
f = listhandler(name)
elseif callbacktypes[name] == data then
f = datahandler(name)
elseif callbacktypes[name] == simple then
f = simplehandler(name)
elseif callbacktypes[name] == first then
f = firsthandler(name)
else
err("unknown callback type")
end
end
return f(...)
end
function priority_in_callback (name, description)
if not name or name == ""
or not callbacktypes[name]
or not description then
return 0
end
local l = callbacklist[name]
if not l then return 0 end
for p, f in pairs(l) do
if f.description == description then
return p
end
end
return 0
end
callback.register = function ()
err("function callback.register has been deleted by luamcallbacks, "
.."please use callback.add instead.")
end
--
-- End of File `mcb.lua'.
|