crypto-square: initial commit

cpp/crypto-square/CMakeLists.txt

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+# Get the exercise name from the current directory
+get_filename_component(exercise ${CMAKE_CURRENT_SOURCE_DIR} NAME)
+
+# Basic CMake project
+cmake_minimum_required(VERSION 2.8.11)
+
+# Name the project after the exercise
+project(${exercise} CXX)
+
+# Locate Boost libraries: unit_test_framework, date_time and regex
+set(Boost_USE_STATIC_LIBS ON)
+set(Boost_USE_MULTITHREADED ON)
+set(Boost_USE_STATIC_RUNTIME OFF)
+find_package(Boost 1.55 REQUIRED COMPONENTS unit_test_framework date_time regex)
+
+# Enable C++11 features on gcc/clang
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)")
+    set(CMAKE_CXX_FLAGS "-std=c++11")
+endif()
+
+# Configure to run all the tests?
+if(${EXERCISM_RUN_ALL_TESTS})
+    add_definitions(-DEXERCISM_RUN_ALL_TESTS)
+endif()
+
+# Get a source filename from the exercise name by replacing -'s with _'s
+string(REPLACE "-" "_" file ${exercise})
+
+# Implementation could be only a header
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${file}.cpp)
+    set(exercise_cpp ${file}.cpp)
+else()
+    set(exercise_cpp "")
+endif()
+
+# Include a test helper header if it exists
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/require_equal_containers.h)
+    set(test_helper require_equal_containers.h)
+else()
+    set(test_helper "")
+endif()
+
+# Build executable from sources and headers
+add_executable(${exercise} ${file}_test.cpp ${test_helper} ${exercise_cpp} ${file}.h)
+
+# We need boost includes
+target_include_directories(${exercise} PRIVATE ${Boost_INCLUDE_DIRS})
+
+# We need boost libraries
+target_link_libraries(${exercise} ${Boost_LIBRARIES})
+
+# Tell MSVC not to warn us about unchecked iterators in debug builds
+if(${MSVC})
+    set_target_properties(${exercise} PROPERTIES
+        COMPILE_DEFINITIONS_DEBUG _SCL_SECURE_NO_WARNINGS)
+endif()
+
+# Run the tests on every build
+add_custom_command(TARGET ${exercise} POST_BUILD COMMAND ${exercise})

cpp/crypto-square/README.md

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+# Crypto Square
+
+Implement the classic method for composing secret messages called a square code.
+
+The input is first normalized: The spaces and punctuation are removed
+from the English text and the message is downcased.
+
+Then, the normalized characters are broken into rows.  These rows can be
+regarded as forming a rectangle when printed with intervening newlines.
+
+For example, the sentence
+
+> If man was meant to stay on the ground god would have given us roots
+
+is 54 characters long.
+
+Broken into 8-character columns, it yields 7 rows.
+
+Those 7 rows produce this rectangle when printed one per line:
+
+```plain
+ifmanwas
+meanttos
+tayonthe
+groundgo
+dwouldha
+vegivenu
+sroots
+```
+
+The coded message is obtained by reading down the columns going left to
+right.
+
+For example, the message above is coded as:
+
+```plain
+imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn sseoau
+```
+
+Write a program that, given an English text, outputs the encoded version
+of that text.
+
+The size of the square (number of columns) should be decided by the
+length of the message.
+
+If the message is a length that creates a perfect square (e.g. 4, 9, 16,
+25, 36, etc), use that number of columns.
+
+If the message doesn't fit neatly into a square, choose the number of
+columns that corresponds to the smallest square that is larger than the
+number of characters in the message.
+
+For example, a message 4 characters long should use a 2 x 2 square. A
+message that is 81 characters long would use a square that is 9 columns
+wide.
+
+A message between 5 and 8 characters long should use a rectangle 3
+characters wide.
+
+Output the encoded text grouped by column.
+
+For example:
+
+- "Have a nice day. Feed the dog & chill out!"
+  - Normalizes to: "haveanicedayfeedthedogchillout"
+  - Which has length: 30
+  - And splits into 5 6-character rows:
+    - "havean"
+    - "iceday"
+    - "feedth"
+    - "edogch"
+    - "illout"
+  - Which yields a ciphertext beginning: "hifei acedl v…"
+
+## Getting Started
+
+Make sure you have read [the C++ page](http://exercism.io/languages/cpp) on
+exercism.io.  This covers the basic information on setting up the development
+environment expected by the exercises.
+
+## Passing the Tests
+
+Get the first test compiling, linking and passing by following the [three
+rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
+Create just enough structure by declaring namespaces, functions, classes,
+etc., to satisfy any compiler errors and get the test to fail.  Then write
+just enough code to get the test to pass.  Once you've done that,
+uncomment the next test by moving the following line past the next test.
+
+```C++
+#if defined(EXERCISM_RUN_ALL_TESTS)
+```
+
+This may result in compile errors as new constructs may be invoked that
+you haven't yet declared or defined.  Again, fix the compile errors minimally
+to get a failing test, then change the code minimally to pass the test,
+refactor your implementation for readability and expressiveness and then
+go on to the next test.
+
+Try to use standard C++11 facilities in preference to writing your own
+low-level algorithms or facilities by hand.  [CppReference](http://en.cppreference.com/)
+is a wiki reference to the C++ language and standard library.  If you
+are new to C++, but have programmed in C, beware of
+[C traps and pitfalls](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers).
+
+## Source
+
+J Dalbey's Programming Practice problems [view source](http://users.csc.calpoly.edu/~jdalbey/103/Projects/ProgrammingPractice.html)

cpp/crypto-square/crypto_square_test.cpp

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+#include "crypto_square.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_CASE(normalize_strange_characters)
+{
+    BOOST_REQUIRE_EQUAL("splunk", crypto_square::cipher("s#$%^&plunk").normalize_plain_text());
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(normalize_numbers)
+{
+    BOOST_REQUIRE_EQUAL("123go", crypto_square::cipher("1, 2, 3 GO!").normalize_plain_text());
+}
+
+BOOST_AUTO_TEST_CASE(size_of_small_square)
+{
+    BOOST_REQUIRE_EQUAL(2U, crypto_square::cipher("1234").size());
+}
+
+BOOST_AUTO_TEST_CASE(size_of_slightly_larger_square)
+{
+    BOOST_REQUIRE_EQUAL(3U, crypto_square::cipher("123456789").size());
+}
+
+BOOST_AUTO_TEST_CASE(size_of_non_perfect_square)
+{
+    BOOST_REQUIRE_EQUAL(4U, crypto_square::cipher("123456789abc").size());
+}
+
+BOOST_AUTO_TEST_CASE(plain_text_segments_from_phrase)
+{
+    const std::vector<std::string> expected{"neverv", "exthin", "eheart", "withid", "lewoes"};
+
+    const auto actual = crypto_square::cipher("Never vex thine heart with idle woes").plain_text_segments();
+
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end());
+}
+
+BOOST_AUTO_TEST_CASE(plain_text_segments_from_complex_phrase)
+{
+    const std::vector<std::string> expected{"zomg", "zomb", "ies"};
+
+    const auto actual = crypto_square::cipher("ZOMG! ZOMBIES!!!").plain_text_segments();
+
+    BOOST_REQUIRE_EQUAL_COLLECTIONS(expected.begin(), expected.end(), actual.begin(), actual.end());
+}
+
+BOOST_AUTO_TEST_CASE(cipher_text_short_phrase)
+{
+    BOOST_REQUIRE_EQUAL("tasneyinicdsmiohooelntuillibsuuml",
+        crypto_square::cipher("Time is an illusion. Lunchtime doubly so.").cipher_text());
+}
+
+BOOST_AUTO_TEST_CASE(cipher_text_long_phrase)
+{
+    BOOST_REQUIRE_EQUAL("wneiaweoreneawssciliprerlneoidktcms",
+        crypto_square::cipher("We all know interspecies romance is weird.").cipher_text());
+}
+
+BOOST_AUTO_TEST_CASE(normalized_cipher_text1)
+{
+    BOOST_REQUIRE_EQUAL("msemoa anindn inndla etltsh ui",
+        crypto_square::cipher("Madness, and then illumination.").normalized_cipher_text());
+}
+
+BOOST_AUTO_TEST_CASE(normalized_cipher_text2)
+{
+    BOOST_REQUIRE_EQUAL("vrela epems etpao oirpo",
+        crypto_square::cipher("Vampires are people too!").normalized_cipher_text());
+}
+#endif