stack setup and integer expression parser

.gitignore

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+.stack-work/
+*~

CHANGELOG.md

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+# Changelog for `hc`
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to the
+[Haskell Package Versioning Policy](https://pvp.haskell.org/).
+
+## Unreleased
+
+## 0.1.0.0 - YYYY-MM-DD

LICENSE

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+Copyright 2024 Author name here
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1.  Redistributions of source code must retain the above copyright notice, this
+    list of conditions and the following disclaimer.
+
+2.  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.
+
+3.  Neither the name of the copyright holder nor the names of its 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 HOLDER 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.

README.md

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+# hc

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main (main) where
+
+import Lib
+
+main :: IO ()
+main = someFunc

hc.cabal

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+cabal-version: 2.2
+
+-- This file has been generated from package.yaml by hpack version 0.35.2.
+--
+-- see: https://github.com/sol/hpack
+
+name:           hc
+version:        0.1.0.0
+description:    Please see the README on GitHub at <https://github.com/githubuser/hc#readme>
+homepage:       https://github.com/githubuser/hc#readme
+bug-reports:    https://github.com/githubuser/hc/issues
+author:         Author name here
+maintainer:     example@example.com
+copyright:      2024 Author name here
+license:        BSD-3-Clause
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    CHANGELOG.md
+
+source-repository head
+  type: git
+  location: https://github.com/githubuser/hc
+
+library
+  exposed-modules:
+      Lib
+  other-modules:
+      Paths_hc
+  autogen-modules:
+      Paths_hc
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
+  build-depends:
+      base >=4.7 && <5
+    , parsec
+  default-language: Haskell2010
+
+executable hc-exe
+  main-is: Main.hs
+  other-modules:
+      Paths_hc
+  autogen-modules:
+      Paths_hc
+  hs-source-dirs:
+      app
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , hc
+    , parsec
+  default-language: Haskell2010
+
+test-suite hc-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_hc
+  autogen-modules:
+      Paths_hc
+  hs-source-dirs:
+      test
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , hc
+    , parsec
+  default-language: Haskell2010

package.yaml

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+name:                hc
+version:             0.1.0.0
+github:              "githubuser/hc"
+license:             BSD-3-Clause
+author:              "Author name here"
+maintainer:          "example@example.com"
+copyright:           "2024 Author name here"
+
+extra-source-files:
+- README.md
+- CHANGELOG.md
+
+# Metadata used when publishing your package
+# synopsis:            Short description of your package
+# category:            Web
+
+# To avoid duplicated efforts in documentation and dealing with the
+# complications of embedding Haddock markup inside cabal files, it is
+# common to point users to the README.md file.
+description:         Please see the README on GitHub at <https://github.com/githubuser/hc#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+- parsec
+
+ghc-options:
+- -Wall
+- -Wcompat
+- -Widentities
+- -Wincomplete-record-updates
+- -Wincomplete-uni-patterns
+- -Wmissing-export-lists
+- -Wmissing-home-modules
+- -Wpartial-fields
+- -Wredundant-constraints
+
+library:
+  source-dirs: src
+
+executables:
+  hc-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - hc
+
+tests:
+  hc-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - hc

src/Lib.hs

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+module Lib
+    ( 
+    ) where
+import Control.Applicative((<*))
+
+import Data.Ratio
+
+import Text.Parsec
+import Text.Parsec.Char
+import Text.Parsec.String
+import Text.Parsec.Expr
+import Text.Parsec.Token
+import Text.Parsec.Language
+
+data Expr = Var String | Constant Integer | Unary UnaryOperator Expr | Binary BinaryOperator Expr Expr
+    deriving Show
+data UnaryOperator = Not
+    deriving Show
+data BinaryOperator = Plus | Minus | Multiply | Divide
+    deriving Show
+
+naturalRatio a = a % 1
+
+def = emptyDef{ commentStart = ""
+              , commentEnd = ""
+              , identStart = letter <|> char '_'
+              , identLetter = alphaNum <|> char '_'
+              , opStart = oneOf "+-/*"
+              , opLetter = oneOf "+-/*"
+              , reservedOpNames = ["+", "-", "/", "*"]
+              , reservedNames = ["pi", "e"]
+              }
+
+TokenParser{ parens = m_parens
+           , identifier = m_identifier
+           , reservedOp = m_reservedOp
+           , reserved   = m_reserved
+           , semiSep1   = m_semiSep1
+           , natural    = m_natural
+           , whiteSpace = m_whiteSpace } = makeTokenParser def
+
+exprparser :: Parser Expr
+exprparser = buildExpressionParser table term <?> "expression"
+
+table = [
+            [
+                Infix (m_reservedOp "*" >> return (Binary Multiply)) AssocLeft,
+                Infix (m_reservedOp "/" >> return (Binary Divide)) AssocLeft
+            ],
+            [
+                Infix (m_reservedOp "+" >> return (Binary Plus)) AssocLeft,
+                Infix (m_reservedOp "-" >> return (Binary Minus)) AssocLeft
+            ]
+        ]
+
+term = m_parens exprparser
+       <|> fmap Var m_identifier
+       <|> fmap Constant m_natural

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:
+# https://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
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/34.yaml
+
+# 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
+#   subdirs:
+#   - auto-update
+#   - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# 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: ">=2.9"
+#
+# 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

stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    sha256: edbd50d7e7c85c13ad5f5835ae2db92fab1e9cf05ecf85340e2622ec0a303df1
+    size: 720020
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/34.yaml
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/34.yaml

test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"