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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')
--
-- See the aforementioned source file(s) for copyright and licensing information.
--
module('luatexbase', package.seeall)
local err, warning, info = luatexbase.provides_module({
name = "luatexbase-mcb",
version = 0.5,
date = "2013/04/13",
description = "register several functions in a callback",
author = "Hans Hagen, Elie Roux, Manuel Pegourie-Gonnard and Philipp Gesang",
copyright = "Hans Hagen, Elie Roux, Manuel Pegourie-Gonnard and Philipp Gesang",
license = "CC0",
})
local callbacklist = callbacklist or { }
local list, data, first, simple = 1, 2, 3, 4
local types = {
list = list,
data = data,
first = first,
simple = simple,
}
local callbacktypes = callbacktypes or {
find_read_file = first,
find_write_file = first,
find_font_file = data,
find_output_file = data,
find_format_file = data,
find_vf_file = data,
find_ocp_file = data,
find_map_file = data,
find_enc_file = data,
find_sfd_file = data,
find_pk_file = data,
find_data_file = data,
find_opentype_file = data,
find_truetype_file = data,
find_type1_file = data,
find_image_file = data,
open_read_file = first,
read_font_file = first,
read_vf_file = first,
read_ocp_file = first,
read_map_file = first,
read_enc_file = first,
read_sfd_file = first,
read_pk_file = first,
read_data_file = first,
read_truetype_file = first,
read_type1_file = first,
read_opentype_file = first,
process_input_buffer = data,
process_output_buffer = data,
token_filter = first,
buildpage_filter = simple,
pre_linebreak_filter = list,
linebreak_filter = list,
post_linebreak_filter = list,
hpack_filter = list,
vpack_filter = list,
pre_output_filter = list,
hyphenate = simple,
ligaturing = simple,
kerning = simple,
mlist_to_hlist = list,
start_run = simple,
stop_run = simple,
start_page_number = simple,
stop_page_number = simple,
show_error_hook = simple,
define_font = first,
}
local lua_callbacks_defaults = { }
local original_register = original_register or callback.register
callback.register = function ()
err("function callback.register has been trapped,\n"
.."please use luatexbase.add_to_callback instead.")
end
local function register_callback(...)
return assert(original_register(...))
end
local function listhandler (name)
return function(head,...)
local ret
local alltrue = true
for _, f in ipairs(callbacklist[name]) do
ret = f.func(head, ...)
if ret == false then
warning("function '%s' returned false\nin callback '%s'",
f.description, name)
break
end
if ret ~= true then
alltrue = false
head = ret
end
end
return alltrue and true or head
end
end
local function datahandler (name)
return function(data, ...)
for _, f in ipairs(callbacklist[name]) do
data = f.func(data, ...)
end
return data
end
end
local function firsthandler (name)
return function(...)
return callbacklist[name][1].func(...)
end
end
local function simplehandler (name)
return function(...)
for _, f in ipairs(callbacklist[name]) do
f.func(...)
end
end
end
local handlers = {
[list] = listhandler,
[data] = datahandler,
[first] = firsthandler,
[simple] = simplehandler,
}
function add_to_callback (name,func,description,priority)
if type(func) ~= "function" then
return err("unable to add function:\nno proper function passed")
end
if not name or name == "" then
err("unable to add function:\nno proper callback name passed")
return
elseif not callbacktypes[name] then
err("unable to add function:\n'%s' is not a valid callback", name)
return
end
if not description or description == "" then
err("unable to add function to '%s':\nno proper description passed",
name)
return
end
if priority_in_callback(name, description) then
err("function '%s' already registered\nin callback '%s'",
description, name)
return
end
local l = callbacklist[name]
if not l then
l = {}
callbacklist[name] = l
if not lua_callbacks_defaults[name] then
register_callback(name, handlers[callbacktypes[name]](name))
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
table.insert(l,priority,f)
if callbacktypes[name] == first and #l ~= 1 then
warning("several functions in '%s',\n"
.."only one will be active.", name)
end
info("inserting '%s'\nat position %s in '%s'",
description, priority, name)
end
function remove_from_callback (name, description)
if not name or name == "" then
err("unable to remove function:\nno proper callback name passed")
return
elseif not callbacktypes[name] then
err("unable to remove function:\n'%s' is not a valid callback", name)
return
end
if not description or description == "" then
err(
"unable to remove function from '%s':\nno proper description passed",
name)
return
end
local l = callbacklist[name]
if not l then
err("no callback list for '%s'",name)
return
end
local index = false
for k,v in ipairs(l) do
if v.description == description then
index = k
break
end
end
if not index then
err("unable to remove '%s'\nfrom '%s'", description, name)
return
end
table.remove(l, index)
info("removing '%s'\nfrom '%s'", description, name)
if #l == 0 then
callbacklist[name] = nil
if not lua_callbacks_defaults[name] then
register_callback(name, nil)
end
end
return
end
function reset_callback (name, make_false)
if not name or name == "" then
err("unable to reset:\nno proper callback name passed")
return
elseif not callbacktypes[name] then
err("unable to reset '%s':\nis not a valid callback", name)
return
end
info("resetting callback '%s'", name)
callbacklist[name] = nil
if not lua_callbacks_defaults[name] then
if make_false == true then
info("setting '%s' to false", name)
register_callback(name, false)
else
register_callback(name, nil)
end
end
end
function priority_in_callback (name, description)
if not name or name == ""
or not callbacktypes[name]
or not description then
return false
end
local l = callbacklist[name]
if not l then return false end
for p, f in pairs(l) do
if f.description == description then
return p
end
end
return false
end
function create_callback(name, ctype, default)
if not name then
err("unable to call callback:\nno proper name passed", name)
return nil
end
if not ctype or not default then
err("unable to create callback '%s':\n"
.."callbacktype or default function not specified", name)
return nil
end
if callbacktypes[name] then
err("unable to create callback '%s':\ncallback already exists", name)
return nil
end
ctype = types[ctype]
if not ctype then
err("unable to create callback '%s':\ntype '%s' undefined", name, ctype)
return nil
end
info("creating '%s' type %s", name, ctype)
lua_callbacks_defaults[name] = default
callbacktypes[name] = ctype
end
function call_callback(name, ...)
if not name then
err("unable to call callback:\nno proper name passed", name)
return nil
end
if not lua_callbacks_defaults[name] then
err("unable to call lua callback '%s':\nunknown callback", name)
return nil
end
local l = callbacklist[name]
local f
if not l then
f = lua_callbacks_defaults[name]
else
f = handlers[callbacktypes[name]](name)
if not f then
err("unknown callback type")
return
end
end
return f(...)
end
--
-- End of File `mcb.lua'.
|
