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-rw-r--r--tex/context/third/enigma/enigma.lua196
1 files changed, 133 insertions, 63 deletions
diff --git a/tex/context/third/enigma/enigma.lua b/tex/context/third/enigma/enigma.lua
index 79aadc6..371ddd9 100644
--- a/tex/context/third/enigma/enigma.lua
+++ b/tex/context/third/enigma/enigma.lua
@@ -67,6 +67,7 @@ libraries.
\stopparagraph
--ichd]]--
+local ioread = io.read
local iowrite = io.write
local mathfloor = math.floor
local mathrandom = math.random
@@ -272,6 +273,8 @@ local pprint_new_machine
local pprint_rotor
local pprint_rotor_scheme
local pprint_step
+local polite_key_request
+local key_invalid
do
local eol = "\n"
@@ -463,9 +466,47 @@ and only then pushes the output.
end
return 0
end
+--[[ichd--
+\startparagraph
+The \luafunction{polite_key_request} will be called in case the
+\identifier{day_key} field of the machine setup is empty at the time of
+initialization.
+\stopparagraph
+--ichd]]--
+ local s_request = "\n\n "
+ .. underline"This is an encrypted document." .. [[
+
+
+ Please enter the document key for enigma machine
+ “%s”.
+
+ Key Format:
+
+Ref R1 R2 R3 I1 I2 I3 [P1 ..] Ref: reflector A/B/C
+ Rn: rotor, I through V
+ In: ring position, 01 through 26
+ Pn: optional plugboard wiring, upto 32
+
+>]]
+ polite_key_request = function (name)
+ return stringformat(s_request, colorize(name, 33))
+ end
+
+ local s_invalid_key = colorize"Warning!"
+ .. " The specified key is invalid."
+ key_invalid = function ()
+ return s_invalid_key
+ end
end
+--[[ichd--
+\startparagraph
+The functions \luafunction{new} and \luafunction{ask_for_day_key} are
+used outside their scope, so we declare them beforehand.
+\stopparagraph
+--ichd]]--
local new
+local ask_for_day_key
do
--[[ichd--
\stopdocsection
@@ -756,7 +797,6 @@ extraction of successive characters from the sequence.
result[#result+1] = tmp
end
end
- print(str)
machine:processed_chars()
return tableconcat(result)
end
@@ -812,25 +852,25 @@ extraction of successive characters from the sequence.
local p_init = P{
"init",
- init = Ct(V"do_init"),
+ init = V"whitespace"^-1 * Ct(V"do_init"),
do_init = V"reflector" * V"whitespace"
- * V"rotors" * V"whitespace"
- * V"ring"
- * (V"whitespace" * V"plugboard")^-1
- ,
+ * V"rotors" * V"whitespace"
+ * V"ring"
+ * (V"whitespace" * V"plugboard")^-1
+ ,
reflector = Cg(C(R("ac","AC")) / stringlower, "reflector"),
rotors = Cg(Ct(V"rotor" * V"whitespace"
- * V"rotor" * V"whitespace"
- * V"rotor"),
- "rotors")
- ,
+ * V"rotor" * V"whitespace"
+ * V"rotor"),
+ "rotors")
+ ,
rotor = Cs(V"roman_five" / roman_digits
+ V"roman_four" / roman_digits
+ V"roman_three" / roman_digits
+ V"roman_two" / roman_digits
+ V"roman_one" / roman_digits)
- ,
+ ,
roman_one = P"I" + P"i",
roman_two = P"II" + P"ii",
roman_three = P"III" + P"iii",
@@ -838,10 +878,10 @@ extraction of successive characters from the sequence.
roman_five = P"V" + P"v",
ring = Cg(Ct(V"double_digit" * V"whitespace"
- * V"double_digit" * V"whitespace"
- * V"double_digit"),
+ * V"double_digit" * V"whitespace"
+ * V"double_digit"),
"ring")
- ,
+ ,
double_digit = C(R"02" * R"09"),
plugboard = Cg(V"do_plugboard", "plugboard"),
@@ -858,7 +898,7 @@ extraction of successive characters from the sequence.
-- * V"letter_combination")
do_plugboard = Ct(V"letter_combination"
* (V"whitespace" * V"letter_combination")^0)
- ,
+ ,
letter_combination = C(R("az", "AZ") * R("az", "AZ")),
whitespace = S" \n\t\v"^1,
@@ -1027,14 +1067,27 @@ consists of three elements:
local processed_chars = function (machine)
emit(1, pprint_machine_step, machine.step, machine.name)
end
- new = function (setup_string, pattern)
- local raw_settings = lpegmatch(p_init, setup_string)
+
+ local handle_day_key handle_day_key = function (dk, name, old)
+ local result
+ if not dk or dk == "" then
+ dk = ask_for_day_key(name, old)
+ end
+ result = lpegmatch(p_init, dk)
+ -- If we don’t like the key we’re going to ask again. And again....
+ return result or handle_day_key(nil, name, dk)
+ end
+
+ new = function (name, setup_string, pattern)
+ --local raw_settings = lpegmatch(p_init, setup_string)
+ local raw_settings = handle_day_key(setup_string, name)
local rotors, ring =
get_rotors(raw_settings.rotors, raw_settings.ring)
local plugboard = raw_settings.plugboard
and get_plugboard_substitution(raw_settings.plugboard)
or get_plugboard_substitution{ }
local machine = {
+ name = name,
step = 0, -- n characters encoded
init = {
rotors = raw_settings.rotors,
@@ -1068,6 +1121,7 @@ consists of three elements:
emit(1, pprint_new_machine, machine)
return machine
end
+
end
--[[ichd--
\stopdocsection
@@ -1078,7 +1132,9 @@ end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\startdocsection[title=Setup Argument Handling]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
+--ichd]]--
+do
+--[[ichd--
\startparagraph
As the module is intended to work both with the Plain and \LATEX\
formats as well as \CONTEXT, we can’t rely on format dependent setups.
@@ -1087,47 +1143,47 @@ as all the functionality resides in Lua.
\stopparagraph
--ichd]]--
-local p_args = P{
- "args",
- args = Cf(Ct"" * (V"kv_pair" + V"emptyline")^0, rawset),
- kv_pair = Cg(V"key"
- * V"separator"
- * (V"value" * V"final"
- + V"empty"))
- * V"rest_of_line"^-1
- ,
- key = V"whitespace"^0 * C(V"key_char"^1),
- key_char = (1 - V"whitespace" - V"eol" - V"equals")^1,
- separator = V"whitespace"^0 * V"equals" * V"whitespace"^0,
- empty = V"whitespace"^0 * V"comma" * V"rest_of_line"^-1
- * Cc(false)
- ,
- value = C((V"balanced" + (1 - V"final"))^1),
- final = V"whitespace"^0 * V"comma" + V"rest_of_string",
- rest_of_string = V"whitespace"^0 * V"eol_comment"^-1 * V"eol"^0 * V"eof",
- rest_of_line = V"whitespace"^0 * V"eol_comment"^-1 * V"eol",
- eol_comment = V"comment_string" * (1 - (V"eol" + V"eof"))^0,
- comment_string = V"lua_comment" + V"TeX_comment",
- TeX_comment = V"percent",
- lua_comment = V"double_dash",
- emptyline = V"rest_of_line",
-
- balanced = V"balanced_brk" + V"balanced_brc",
- balanced_brk = V"lbrk" * (V"balanced" + (1 - V"rbrk"))^0 * V"rbrk",
- balanced_brc = V"lbrc" * (V"balanced" + (1 - V"rbrc"))^0 * V"rbrc",
-
- -- Terminals
- eol = P"\n\r" + P"\r\n" + P"\n" + P"\r", -- users do strange things
- eof = -P(1),
- whitespace = S" \t\v",
- equals = P"=",
- dot = P".",
- comma = P",",
- dash = P"-", double_dash = V"dash" * V"dash",
- percent = P"%",
- lbrk = P"[", rbrk = P"]",
- lbrc = P"{", rbrc = P"}",
-}
+ local p_args = P{
+ "args",
+ args = Cf(Ct"" * (V"kv_pair" + V"emptyline")^0, rawset),
+ kv_pair = Cg(V"key"
+ * V"separator"
+ * (V"value" * V"final"
+ + V"empty"))
+ * V"rest_of_line"^-1
+ ,
+ key = V"whitespace"^0 * C(V"key_char"^1),
+ key_char = (1 - V"whitespace" - V"eol" - V"equals")^1,
+ separator = V"whitespace"^0 * V"equals" * V"whitespace"^0,
+ empty = V"whitespace"^0 * V"comma" * V"rest_of_line"^-1
+ * Cc(false)
+ ,
+ value = C((V"balanced" + (1 - V"final"))^1),
+ final = V"whitespace"^0 * V"comma" + V"rest_of_string",
+ rest_of_string = V"whitespace"^0 * V"eol_comment"^-1 * V"eol"^0 * V"eof",
+ rest_of_line = V"whitespace"^0 * V"eol_comment"^-1 * V"eol",
+ eol_comment = V"comment_string" * (1 - (V"eol" + V"eof"))^0,
+ comment_string = V"lua_comment" + V"TeX_comment",
+ TeX_comment = V"percent",
+ lua_comment = V"double_dash",
+ emptyline = V"rest_of_line",
+
+ balanced = V"balanced_brk" + V"balanced_brc",
+ balanced_brk = V"lbrk" * (V"balanced" + (1 - V"rbrk"))^0 * V"rbrk",
+ balanced_brc = V"lbrc" * (V"balanced" + (1 - V"rbrc"))^0 * V"rbrc",
+
+ -- Terminals
+ eol = P"\n\r" + P"\r\n" + P"\n" + P"\r", -- users do strange things
+ eof = -P(1),
+ whitespace = S" \t\v",
+ equals = P"=",
+ dot = P".",
+ comma = P",",
+ dash = P"-", double_dash = V"dash" * V"dash",
+ percent = P"%",
+ lbrk = P"[", rbrk = P"]",
+ lbrc = P"{", rbrc = P"}",
+ }
--[[ichd--
@@ -1138,7 +1194,6 @@ a sanitizer routine and, if so, apply it to its value.
\stopparagraph
--ichd]]--
-do
local boolean_synonyms = {
["1"] = true,
doit = true,
@@ -1155,7 +1210,7 @@ do
local ans = alpha + digit + space
local p_ans = Cs((ans + (1 - ans / ""))^1)
local alphanum_or_space = function (str)
- if type(str) ~= "string" then return "" end
+ if type(str) ~= "string" then return nil end
return lpegmatch(p_ans, str)
end
local ensure_int = function (n)
@@ -1188,6 +1243,21 @@ do
end
return args
end
+--[[ichd--
+\startparagraph
+If the machine setting lacks key settings then we’ll go ahead and ask
+the user directly, hence the function \luafunction{ask_for_day_key}.
+\stopparagraph
+--ichd]]--
+ ask_for_day_key = function (name, old)
+ if old then
+ emit(0, key_invalid)
+ end
+ emit(0, polite_key_request, name)
+ local result = ioread()
+ iowrite("\n")
+ return alphanum_or_space(result) or ask_for_day_key(name)
+ end
end
--[[ichd--
@@ -1279,10 +1349,10 @@ end
enigma.save_raw_args = save_raw_args
enigma.retrieve_raw_args = retrieve_raw_args
+
local new_machine = function (args, name)
verbose_level = args.verbose
- local machine = new(args.day_key, args.rotor_setting)
- machine.name = name
+ local machine = new(name, args.day_key, args.rotor_setting)
return machine
end
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