Started work on hauswirth hw09

hw09/.gitignore

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+.stack-work/
+*~

hw09/ChangeLog.md

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+# Changelog for hw09
+
+## Unreleased changes

hw09/LICENSE

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+Copyright Author name here (c) 2020
+
+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 Author name here 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.

hw09/README.md

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+# hw09

hw09/Setup.hs

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+import Distribution.Simple
+main = defaultMain

hw09/app/Main.hs

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

hw09/hw09.cabal

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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.33.0.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 1c6863276828ebb115e333a5efb87447315a7c7d6871b21ef1a5b25f9b9e7e47
+
+name:           hw09
+version:        0.1.0.0
+description:    Please see the README on GitHub at <https://github.com/githubuser/hw09#readme>
+homepage:       https://github.com/githubuser/hw09#readme
+bug-reports:    https://github.com/githubuser/hw09/issues
+author:         Author name here
+maintainer:     example@example.com
+copyright:      2020 Author name here
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://github.com/githubuser/hw09
+
+library
+  exposed-modules:
+      AST
+      Parser
+  other-modules:
+      Paths_hw09
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+    , regex-tdfa
+  default-language: Haskell2010
+
+executable hw09-exe
+  main-is: Main.hs
+  other-modules:
+      Paths_hw09
+  hs-source-dirs:
+      app
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , hw09
+    , regex-tdfa
+  default-language: Haskell2010
+
+test-suite hw09-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_hw09
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , hw09
+    , regex-tdfa
+  default-language: Haskell2010

hw09/package.yaml

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+name:                hw09
+version:             0.1.0.0
+github:              "githubuser/hw09"
+license:             BSD3
+author:              "Author name here"
+maintainer:          "example@example.com"
+copyright:           "2020 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/hw09#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+- regex-tdfa
+
+library:
+  source-dirs: src
+
+executables:
+  hw09-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - hw09
+
+tests:
+  hw09-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - hw09

hw09/src/AST.hs

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+module AST where
+
+-- A variable in a function, like 'x' or 'y'
+newtype Variable = Var String
+
+-- The instructions in out IJVM AST
+data Instruction = IADD | ISUB | IMUL | IDIV | IEXP | INEG | BIPUSH Int | ILOAD Variable
+
+-- The program is just a list of instructions
+type Program = [Instruction]

hw09/src/Parser.hs

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+-- vim: set ts=2 sw=2 et tw=80:
+
+module Parser where
+
+import Data.List
+import Text.Regex.TDFA
+
+-- Types of tokens (sequences of characters with a meaning, e.g. '(')
+data TokenType = Exp | Plus | Minus | Star | Slash
+  | Percent | OpenParen | CloseParen | EOF
+
+-- A token has a type its string contents
+data Token = Symbol TokenType | Literal String | Identifier String
+
+-- Represents a newly scanned token and the remaining string to parse
+type ScanState = (Token, String)
+
+-- Returns the string representation of the token type
+tokenText :: TokenType -> String
+tokenText Exp = "%"
+tokenText Plus = "+"
+tokenText Minus = "-"
+tokenText Star = "*"
+tokenText Slash = "/"
+tokenText Percent = "%"
+tokenText OpenParen = "("
+tokenText CloseParen = ")"
+
+-- If the token is found at the start of the string, returns Just of the token
+-- and the remaining string, otherwise returns Nothing
+findTokenText :: TokenType -> String -> Maybe ScanState
+findTokenText EOF [] = Just (Symbol EOF, [])
+findTokenText _ [] = Nothing
+findTokenText tt s = if matches then Just (Symbol tt, rest) else Nothing
+  where text = tokenText tt
+        matches = text `isPrefixOf` s
+        rest = drop (length text) s
+
+matchesRegex :: (String -> Token) -> String -> String -> Maybe ScanState
+matchesRegex tokenConstr r s = case match of
+                                 [] -> Nothing
+                                 s -> Just (tokenConstr match, rest)
+  where match = s =~ r :: String
+        rest = drop (length match) s
+
+matchesIdentifier :: String -> Maybe ScanState
+matchesIdentifier = matchesRegex Identifier "[a-zA-Z][0-9a-zA-Z]+"
+
+matchesLiteral :: String -> Maybe ScanState
+matchesLiteral = matchesRegex Literal "[0-9]+"
+
+tokenFactories :: [String -> Maybe ScanState]
+tokenFactories = [
+  matchesIdentifier,
+  matchesLiteral,
+  findTokenText Plus,
+  findTokenText Exp,
+  findTokenText Minus,
+  findTokenText Star,
+  findTokenText Slash,
+  findTokenText Percent,
+  findTokenText OpenParen,
+  findTokenText CloseParen]
+
+scanToken :: String -> [Maybe ScanState]
+scanToken s = fmap ($s) tokenFactories
+
+-- TODO: make ScanState a monoid and implement <> as picking the token
+-- with minimum length

hw09/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: lts-16.3
+
+# 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: ">=2.3"
+#
+# 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

hw09/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:
+    size: 531696
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/3.yaml
+    sha256: 65e3a94c65ad07fa1913649e3f1e36c4af51bf528a5d9fd217bdc1b46d0477cc
+  original: lts-16.3

hw09/test/Spec.hs

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