diff options
Diffstat (limited to 'tex/context/third')
| -rw-r--r-- | tex/context/third/enigma/enigma.lua | 164 |
1 files changed, 101 insertions, 63 deletions
diff --git a/tex/context/third/enigma/enigma.lua b/tex/context/third/enigma/enigma.lua index db2d032..73c481f 100644 --- a/tex/context/third/enigma/enigma.lua +++ b/tex/context/third/enigma/enigma.lua @@ -12,6 +12,44 @@ --[[ichd-- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\startsection[title=Format Dependent Code] +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +\startparagraph +Exported functionality will be collected in the table +\identifier{enigma}. +\stopparagraph +--ichd]]-- + +local enigma = { machines = { }, callbacks = { } } +local format_is_context_p = false + +--[[ichd +\startparagraph +Afaict, \LATEX\ for \LUATEX\ still lacks a globally accepted namespacing +convention. This is more than bad, but we’ll have to cope with that. For +this reason we brazenly introduce \identifier{packagedata} (in analogy +to \CONTEXT’s \identifier{thirddata}) table as a package namespace +proposal. If this module is called from a \LATEX\ or plain session, the +table \identifier{packagedata} will already have been created so we will +identify the format according to its presence or absence, respectively. +\stopparagraph +--ichd]]-- + +if packagedata then -- latex or plain + packagedata.enigma = enigma +elseif thirddata then -- context + format_is_context_p = true + thirddata.enigma = enigma +else -- external call, mtx-script or whatever + _G.enigma = enigma +end +--[[ichd +\stopsection +--ichd]]-- + +--[[ichd-- +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startsection[title=Prerequisites] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startparagraph @@ -28,31 +66,34 @@ the libraries. \stopparagraph --ichd]]-- -local iowrite = io.write -local mathfloor = math.floor -local mathrandom = math.random -local next = next -local nodecopy = node.copy -local nodeid = node.id -local nodeinsert_before = node.insert_before -local nodenew = node.new -local noderemove = node.remove -local nodetraverse = node.traverse -local stringfind = string.find -local stringformat = string.format -local stringlower = string.lower -local stringsub = string.sub -local stringupper = string.upper -local tableconcat = table.concat -local tonumber = tonumber -local utf8byte = unicode.utf8.byte -local utf8char = unicode.utf8.char -local utf8len = unicode.utf8.len -local utf8sub = unicode.utf8.sub -local utfcharacters = string.utfcharacters - -local glyph_node = nodeid"glyph" -local glue_node = nodeid"glue" + +local iowrite = io.write +local mathfloor = math.floor +local mathrandom = math.random +local next = next +local nodecopy = node.copy +local nodeid = node.id +local nodeinsert_before = node.insert_before +local nodenew = node.new +local noderemove = node.remove +local nodetraverse = node.traverse +local nodesinstallattributehandler = format_is_context_p and nodes.installattributehandler +local nodestasksappendaction = format_is_context_p and nodes.tasks.appendaction +local stringfind = string.find +local stringformat = string.format +local stringlower = string.lower +local stringsub = string.sub +local stringupper = string.upper +local tableconcat = table.concat +local tonumber = tonumber +local utf8byte = unicode.utf8.byte +local utf8char = unicode.utf8.char +local utf8len = unicode.utf8.len +local utf8sub = unicode.utf8.sub +local utfcharacters = string.utfcharacters + +local glyph_node = nodeid"glyph" +local glue_node = nodeid"glue" --[[ichd \startparagraph @@ -436,9 +477,9 @@ The latter is an essential prerequisite for double-stepping. --[[ichd-- \startparagraph -The \luafunction{rotate} function takes care of rotor ({\em Walze}) +The \luafunction{rotate} function takes care of rotor (\emph{Walze}) movement. This entails incrementing the next rotor whenever the notch -has been reached and covers the corner case {\em double stepping}. +has been reached and covers the corner case \emph{double stepping}. \stopparagraph --ichd]]-- local rotate = function (machine) @@ -624,7 +665,7 @@ some pretty printer hooks reside here. \startparagraph \luafunction{encode_char} contributes only one element of the encoding -procedure: the plugboard ({\em Steckerbrett}). +procedure: the plugboard (\emph{Steckerbrett}). Like the rotors described above, a character passed through this device twice; the plugboard marks the beginning and end of every step. For debugging purposes, the first substitution is stored in a separate @@ -1002,43 +1043,11 @@ consists of three elements: return machine end end - ---[[ichd-- -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -\startsection[title=Format Dependent Code] -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% - -\startparagraph -Exported functionality will be collected in the table -\identifier{enigma}. -\stopparagraph ---ichd]]-- - -local enigma = { machines = { }, callbacks = { } } - ---[[ichd -\startparagraph -Afaict, \LATEX\ for \LUATEX\ still lacks a globally accepted namespacing -convention. This is more than bad, but we’ll have to cope with that. For -this reason we brazenly introduce \identifier{packagedata} (in analogy -to \CONTEXT’s \identifier{thirddata}) table as a package namespace -proposal. If this module is called from a \LATEX\ or plain session, the -table \identifier{packagedata} will already have been created so we will -identify the format according to its presence or absence, respectively. -\stopparagraph ---ichd]]-- - -if packagedata then -- latex or plain - packagedata.enigma = enigma -elseif thirddata then -- context - packagedata.enigma = enigma -else -- external call, mtx-script or whatever - _G.enigma = enigma -end --[[ichd \stopsection --ichd]]-- + --[[ichd-- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \startsection[title=Setup Argument Handling] @@ -1162,13 +1171,28 @@ end --[[ichd \startsection[title=Callback] \startparagraph -This is the interface to \TEX. +This is the interface to \TEX. We generate a new callback handler for +each defined Enigma machine. \CONTEXT\ delivers the head as third +argument of a callback only (...‽), so we’ll have to do some variable +shuffling on the function side. +\stopparagraph + +\startparagraph +\useURL[khaled_hosny_texsx] [http://tex.stackexchange.com/a/11970] + [] [tex.sx] +Registering a callback (“node attribute”?, “node task”?, “task action”?) +in \CONTEXT\ is not straightforward, let alone documented. The trick is +to create, install and register a handler first in order to use it later +on \dots\ many thanks to Khaled Hosny, who posted an answer to +\from[khaled_hosny_texsx]. \stopparagraph --ichd]]-- enigma.new_callback = function (machine, name) enigma.machines [name] = machine - enigma.callbacks[name] = function (head) + local format_is_context_p = format_is_context_p + local cbk = function (a, _, c) + local head = format_is_context_p and c or a for n in nodetraverse(head) do --print(node, node.id) if n.id == glyph_node then @@ -1193,8 +1217,22 @@ enigma.new_callback = function (machine, name) noderemove(head, n) end end + --if context then return head, true end return head end + if format_is_context_p then + local cbk_id = "enigma_" .. name + enigma.callbacks[name] = nodesinstallattributehandler{ + name = cbk_id, + namespace = thirddata.enigma, + processor = cbk, + } + nodestasksappendaction("processors", + "characters", + "thirddata.enigma.callbacks." .. name) + else + enigma.callbacks[name] = cbk + end end --local teststring = [[B I II III 01 01 01]] |