Ch 14: Test WordNumber

Author: dwayne

ch14/chex/.gitignore

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+.stack-work/

ch14/chex/LICENSE

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+Copyright Dwayne Crooks (c) 2016
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Dwayne Crooks nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

ch14/chex/Setup.hs

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+import Distribution.Simple
+main = defaultMain

ch14/chex/WordNumber.hs

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+module WordNumber where
+
+import Data.List (intersperse)
+import Data.Maybe (fromJust)
+
+digitToWord :: Int -> Maybe String
+digitToWord 0 = Just "zero"
+digitToWord 1 = Just "one"
+digitToWord 2 = Just "two"
+digitToWord 3 = Just "three"
+digitToWord 4 = Just "four"
+digitToWord 5 = Just "five"
+digitToWord 6 = Just "six"
+digitToWord 7 = Just "seven"
+digitToWord 8 = Just "eight"
+digitToWord 9 = Just "nine"
+digitToWord _ = Nothing
+
+digits :: Int -> [Int]
+digits n
+  | n == 0    = []
+  | otherwise = digits (div n 10) ++ [mod n 10]
+
+wordNumber :: Int -> String
+wordNumber = concat . intersperse "-" . map (fromJust . digitToWord) . digits

ch14/chex/WordNumberTest.hs

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+module WordNumberTest where
+
+import Test.Hspec
+import WordNumber (digitToWord, digits, wordNumber)
+
+main :: IO ()
+main = hspec $ do
+  describe "digitToWord" $ do
+    it "returns Just zero for 0" $ do
+      digitToWord 0 `shouldBe` Just "zero"
+    it "returns Just one for 1" $ do
+      digitToWord 1 `shouldBe` Just "one"
+
+  describe "digits" $ do
+    it "returns [1] for 1" $ do
+      digits 1 `shouldBe` [1]
+    it "returns [1, 0, 0] for 100" $ do
+      digits 100 `shouldBe` [1, 0, 0]
+
+  describe "wordNumber" $ do
+    it "returns one-zero-zero for 100" $ do
+      wordNumber 100 `shouldBe` "one-zero-zero"
+    it "returns nine-zero-zero-one for 9001" $ do
+      wordNumber 9001 `shouldBe` "nine-zero-zero-one"

ch14/chex/chex.cabal

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+name:                chex
+version:             0.1.0.0
+synopsis:            Initial project template from stack
+description:         Please see README.md
+homepage:            https://github.com/dwayne/chex#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Dwayne Crooks
+maintainer:          me@dwaynecrooks.com
+copyright:           2016 Dwayne Crooks
+category:            Text
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:       .
+  default-language:     Haskell2010
+  ghc-options:          -Wall -fwarn-tabs
+  exposed-modules:      WordNumberTest
+  build-depends:        base >= 4.7 && < 5
+                      , hspec

ch14/chex/stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# http://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+#  name: custom-snapshot
+#  location: "./custom-snapshot.yaml"
+resolver: lts-5.17
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#   extra-dep: true
+#  subdirs:
+#  - auto-update
+#  - wai
+#
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- '.'
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.1"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor