Automatic generation produced by ISE Eiffel
indexing
description: "Objects that provide a simple encryption engine"
author: "CSARDAS TEAM"
date: "May 2007"
revision: "$1.0$"
class
ENIGMA
create
make
feature {NONE} -- Initialization
default_create
-- Process instances of classes with no creation clause.
-- (Default: do nothing.)
-- (from ANY)
do
end
feature -- Access
generating_type: STRING_8
-- Name of current object's generating type
-- (type of which it is a direct instance)
-- (from ANY)
external
"built_in"
ensure -- from ANY
generating_type_not_void: Result /= Void
generating_type_not_empty: not Result.is_empty
end
generator: STRING_8
-- Name of current object's generating class
-- (base class of the type of which it is a direct instance)
-- (from ANY)
external
"built_in"
ensure -- from ANY
generator_not_void: Result /= Void
generator_not_empty: not Result.is_empty
end
feature -- Comparison
frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
-- Are `some' and `other' either both void
-- or attached to isomorphic object structures?
-- (from ANY)
do
if some = Void then
Result := other = Void
else
Result := other /= Void and then some.is_deep_equal (other)
end
ensure -- from ANY
shallow_implies_deep: standard_equal (some, other) implies Result
both_or_none_void: (some = Void) implies (Result = (other = Void))
same_type: (Result and (some /= Void)) implies some.same_type (other)
symmetric: Result implies deep_equal (other, some)
end
frozen equal (some: ANY; other: like arg #1): BOOLEAN
-- Are `some' and `other' either both void or attached
-- to objects considered equal?
-- (from ANY)
do
if some = Void then
Result := other = Void
else
Result := other /= Void and then some.is_equal (other)
end
ensure -- from ANY
definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))
end
frozen is_deep_equal (other: like Current): BOOLEAN
-- Are `Current' and `other' attached to isomorphic object structures?
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
external
"built_in"
ensure -- from ANY
shallow_implies_deep: standard_is_equal (other) implies Result
same_type: Result implies same_type (other)
symmetric: Result implies other.is_deep_equal (Current)
end
is_equal (other: like Current): BOOLEAN
-- Is `other' attached to an object considered
-- equal to current object?
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
do
Result := standard_is_equal (other)
ensure -- from ANY
symmetric: Result implies other.is_equal (Current)
consistent: standard_is_equal (other) implies Result
end
frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
-- Are `some' and `other' either both void or attached to
-- field-by-field identical objects of the same type?
-- Always uses default object comparison criterion.
-- (from ANY)
do
if some = Void then
Result := other = Void
else
Result := other /= Void and then some.standard_is_equal (other)
end
ensure -- from ANY
definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))
end
frozen standard_is_equal (other: like Current): BOOLEAN
-- Is `other' attached to an object of the same type
-- as current object, and field-by-field identical to it?
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
external
"built_in"
ensure -- from ANY
same_type: Result implies same_type (other)
symmetric: Result implies other.standard_is_equal (Current)
end
feature -- Status report
conforms_to (other: ANY): BOOLEAN
-- Does type of current object conform to type
-- of `other' (as per Eiffel: The Language, chapter 13)?
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
external
"built_in"
end
same_type (other: ANY): BOOLEAN
-- Is type of current object identical to type of `other'?
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
external
"built_in"
ensure -- from ANY
definition: Result = (conforms_to (other) and other.conforms_to (Current))
end
feature -- Duplication
frozen clone (other: ANY): like other
obsolete "Use `twin' instead."
-- Void if `other' is void; otherwise new object
-- equal to `other'
--
-- For non-void `other', clone calls copy;
-- to change copying/cloning semantics, redefine copy.
-- (from ANY)
do
if other /= Void then
Result := other.twin
end
ensure -- from ANY
equal: equal (Result, other)
end
copy (other: like Current)
-- Update current object using fields of object attached
-- to `other', so as to yield equal objects.
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
type_identity: same_type (other)
external
"built_in"
ensure -- from ANY
is_equal: is_equal (other)
end
frozen deep_clone (other: ANY): like other
obsolete "Use `deep_twin' instead."
-- Void if `other' is void: otherwise, new object structure
-- recursively duplicated from the one attached to `other'
-- (from ANY)
do
if other /= Void then
Result := other.deep_twin
end
ensure -- from ANY
deep_equal: deep_equal (other, Result)
end
frozen deep_copy (other: like Current)
-- Effect equivalent to that of:
-- copy (`other' . deep_twin)
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
do
copy (other.deep_twin)
ensure -- from ANY
deep_equal: deep_equal (Current, other)
end
frozen deep_twin: like Current
-- New object structure recursively duplicated from Current.
-- (from ANY)
external
"built_in"
ensure -- from ANY
deep_twin_not_void: Result /= Void
deep_equal: deep_equal (Current, Result)
end
frozen standard_clone (other: ANY): like other
obsolete "Use `standard_twin' instead."
-- Void if `other' is void; otherwise new object
-- field-by-field identical to `other'.
-- Always uses default copying semantics.
-- (from ANY)
do
if other /= Void then
Result := other.standard_twin
end
ensure -- from ANY
equal: standard_equal (Result, other)
end
frozen standard_copy (other: like Current)
-- Copy every field of `other' onto corresponding field
-- of current object.
-- (from ANY)
require -- from ANY
other_not_void: other /= Void
type_identity: same_type (other)
external
"built_in"
ensure -- from ANY
is_standard_equal: standard_is_equal (other)
end
frozen standard_twin: like Current
-- New object field-by-field identical to `other'.
-- Always uses default copying semantics.
-- (from ANY)
local
l_temp: BOOLEAN
do
l_temp := {ISE_RUNTIME}.check_assert (False)
Result ?= {ISE_RUNTIME}.c_standard_clone ($Current)
Result.standard_copy (Current)
l_temp := {ISE_RUNTIME}.check_assert (l_temp)
ensure -- from ANY
standard_twin_not_void: Result /= Void
equal: standard_equal (Result, Current)
end
frozen twin: like Current
-- New object equal to `Current'
-- twin calls copy; to change copying/twining semantics, redefine copy.
-- (from ANY)
local
l_temp: BOOLEAN
do
l_temp := {ISE_RUNTIME}.check_assert (False)
Result ?= {ISE_RUNTIME}.c_standard_clone ($Current)
Result.copy (Current)
l_temp := {ISE_RUNTIME}.check_assert (l_temp)
ensure -- from ANY
twin_not_void: Result /= Void
is_equal: Result.is_equal (Current)
end
feature -- Basic operations
frozen default: like Current
-- Default value of object's type
-- (from ANY)
do
end
frozen default_pointer: POINTER
-- Default value of type `POINTER'
-- (Avoid the need to write `p'.default for
-- some `p' of type `POINTER'.)
-- (from ANY)
do
end
default_rescue
-- Process exception for routines with no Rescue clause.
-- (Default: do nothing.)
-- (from ANY)
do
end
frozen do_nothing
-- Execute a null action.
-- (from ANY)
do
end
feature -- Output
io: STD_FILES
-- Handle to standard file setup
-- (from ANY)
once
create Result
Result.set_output_default
ensure -- from ANY
io_not_void: Result /= Void
end
out: STRING_8
-- New string containing terse printable representation
-- of current object
-- (from ANY)
do
Result := tagged_out
ensure -- from ANY
out_not_void: Result /= Void
end
print (some: ANY)
-- Write terse external representation of `some'
-- on standard output.
-- (from ANY)
do
if some /= Void then
io.put_string (some.out)
end
end
frozen tagged_out: STRING_8
-- New string containing terse printable representation
-- of current object
-- (from ANY)
external
"built_in"
ensure -- from ANY
tagged_out_not_void: Result /= Void
end
feature -- Platform
operating_environment: OPERATING_ENVIRONMENT
-- Objects available from the operating system
-- (from ANY)
once
create Result
ensure -- from ANY
operating_environment_not_void: Result /= Void
end
feature {NONE} -- Retrieval
frozen internal_correct_mismatch
-- Called from runtime to perform a proper dynamic dispatch on `correct_mismatch'
-- from MISMATCH_CORRECTOR.
-- (from ANY)
local
l_corrector: MISMATCH_CORRECTOR
l_msg: STRING_8
l_exc: EXCEPTIONS
do
l_corrector ?= Current
if l_corrector /= Void then
l_corrector.correct_mismatch
else
create l_msg.make_from_string ("Mismatch: ")
create l_exc
l_msg.append (generating_type)
l_exc.raise_retrieval_exception (l_msg)
end
end
feature {NONE} -- attributes
char_from: HASH_TABLE [CHARACTER_8, CHARACTER_8]
char_to: HASH_TABLE [CHARACTER_8, CHARACTER_8]
key: INTEGER_32
feature -- creation
make (k: INTEGER_32)
-- Initialize `Current'.
require else
k > -1 and k < 10
do
key := k \\ 3
create char_to.make (40)
create char_from.make (40)
char_to.put ('a', 'q')
char_from.put ('q', 'a')
char_to.put ('b', 'w')
char_from.put ('w', 'b')
char_to.put ('c', 'e')
char_from.put ('e', 'c')
char_to.put ('d', 'r')
char_from.put ('r', 'd')
char_to.put ('e', 't')
char_from.put ('t', 'e')
char_to.put ('f', 'y')
char_from.put ('y', 'f')
char_to.put ('g', 'u')
char_from.put ('u', 'g')
char_to.put ('h', 'i')
char_from.put ('i', 'h')
char_to.put ('i', 'o')
char_from.put ('o', 'i')
char_to.put ('j', 'p')
char_from.put ('p', 'j')
char_to.put ('k', 'a')
char_from.put ('a', 'k')
char_to.put ('l', 's')
char_from.put ('s', 'l')
char_to.put ('m', 'd')
char_from.put ('d', 'm')
char_to.put ('n', 'f')
char_from.put ('f', 'n')
char_to.put ('o', 'g')
char_from.put ('g', 'o')
char_to.put ('p', 'h')
char_from.put ('h', 'p')
char_to.put ('q', 'j')
char_from.put ('j', 'q')
char_to.put ('r', 'k')
char_from.put ('k', 'r')
char_to.put ('s', 'l')
char_from.put ('l', 's')
char_to.put ('t', 'z')
char_from.put ('z', 't')
char_to.put ('u', 'x')
char_from.put ('x', 'u')
char_to.put ('v', 'c')
char_from.put ('c', 'v')
char_to.put ('x', 'v')
char_from.put ('v', 'x')
char_to.put ('w', 'b')
char_from.put ('b', 'w')
char_to.put ('y', 'n')
char_from.put ('n', 'y')
char_to.put ('z', 'm')
char_from.put ('m', 'z')
char_to.put ('!', '@')
char_from.put ('@', '!')
char_to.put ('%%', '.')
char_from.put ('.', '%%')
char_to.put ('^', ' ')
char_from.put (' ', '^')
end
feature -- operation
decrypt (str: STRING_8): STRING_8
--
require -- from ENCRYPTOR
True
require else
str /= Void
local
size: INTEGER_32
i: INTEGER_32
e_str: STRING_8
do
create e_str.make_from_string (str)
e_str.to_lower
size := e_str.count
create Result.make_empty
from
i := 1
until
i > size
loop
if char_from.has (e_str.item (i) - key) then
Result.append_character (char_from.item (e_str.item (i) - key))
else
Result.append_character (e_str.item (i))
end
i := i + 1
end
end
encrypt (str: STRING_8): STRING_8
-- IT ONLY STORE LOWER CASE STRING
require -- from ENCRYPTOR
True
require else
str /= Void
local
size: INTEGER_32
i: INTEGER_32
e_str: STRING_8
do
create e_str.make_from_string (str)
e_str.to_lower
size := e_str.count
create Result.make_empty
from
i := 1
until
i > size
loop
if char_to.has (e_str.item (i)) then
Result.append_character (char_to.item (e_str.item (i)) + key)
else
Result.append_character (e_str.item (i))
end
i := i + 1
end
end
invariant
-- from ANY
reflexive_equality: standard_is_equal (Current)
reflexive_conformance: conforms_to (Current)
end -- class ENIGMA
-- Generated by ISE Eiffel --
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