Added Lexer for the Language

Author: vijayphoenix

ChangeLog.md

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+# Changelog for Haskull
+
+## Unreleased changes

LICENSE

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+Copyright Author name here (c) 2019
+
+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.

README.md

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+# Implementing a JIT Compiled Language with Haskell 
+
+## About  
+
+### Built With  
+
+### Installing
+
+On Linux  
+
+### Documentation  
+
+This project is documented under [DOXYGEN](http://www.doxygen.nl/)  Documentation  
+
+### Authors  
+
+* [**Vijay Tadikamalla**](https://github.com/vijayphoenix)  
+* [**Anjani Kumar**](https://github.com/anjani-1)  
+* [**Anupam Saini**](https://github.com/anupamsaini98)  
+* [**Yogesh Singh**](https://github.com/yo5sh)  
+
+#### License  
+
+#### Acknowledgments  
+* [Haskell LLVM JIT Compiler Tutorial](http://www.stephendiehl.com/llvm)

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import Lexer
+
+main :: IO ()
+main = do
+    str <- getLine
+    putStrLn ("Input:" ++ str)
+    print $ parse ident "File1" str
+    main 
+    -- print $ parse ident "File1" str

package.yaml

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+name:                Haskull
+version:             0.1.0.0
+github:              "https://github.com/IITH-SBJoshi/haskell-11"
+license:             BSD3
+author:              "Anjani Kumar"
+maintainer:          "cs17btech11002@iith.ac.in"
+copyright:           "2019 Anjani Kumar"
+
+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/IITH-SBJoshi/haskell-11#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+- haskeline            >= 0.7.1.2
+- llvm-hs              >= 4.0.0.0
+- llvm-hs-pure         >= 4.0.0.0
+- parsec               >= 3.1
+- bytestring           >= 0.10
+- mtl                  >= 2.1.3
+- transformers         >= 0.3.0.0 && < 0.6
+- containers           >= 0.4
+
+library:
+  source-dirs: src
+
+executables:
+  Haskull-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - Haskull
+
+tests:
+  Haskull-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - Haskull

src/Language.hs

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+module Language ( 
+    haskullstyle, 
+    haskulldef
+) where 
+
+import Text.Parsec
+import Text.Parsec.Token
+import Text.Parsec.Language
+
+
+-- | This is a minimal token definition for Haskull style languages. It
+-- defines the style of comments, valid identifiers and case
+-- sensitivity. It does not define any reserved words or operators.
+
+haskullstyle :: LanguageDef st
+haskullstyle = emptyDef { 
+      commentStart      = "{-"
+    , commentEnd        = "-}"
+    , commentLine       = "//"
+    , nestedComments    = False
+    , reservedNames     = []
+    , reservedOpNames   = []
+    , caseSensitive     = True
+    , identStart        = letter <|> char '_'
+    , identLetter       = alphaNum <|> oneOf "_'"
+}
+
+
+-- | The language definition for the Haskull language.
+haskulldef = haskullstyle { 
+    reservedOpNames   = ["+", "/", "-", "*", ";"], 
+    reservedNames     = ["int", "char", "def", "extern"]
+}
+    

src/Lexer.hs

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+module Lexer (
+    lexer, 
+    ident,
+    reserved,
+    reservedOp,
+    charLiteral,
+    Parser(..),
+    parse
+) where 
+
+import Language
+import Text.Parsec
+import qualified Text.Parsec.Token as Tok
+import Text.Parsec.String (Parser)
+
+lexer :: Tok.TokenParser st
+lexer = Tok.makeTokenParser haskulldef
+
+ident :: Parser String
+ident = Tok.identifier lexer
+
+reserved :: String -> Parser ()
+reserved = Tok.reserved lexer 
+
+reservedOp :: String -> Parser () 
+reservedOp = Tok.reservedOp lexer 
+
+charLiteral :: Parser Char 
+charLiteral = Tok.charLiteral lexer 

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-8.13
+
+# 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
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+
+extra-deps:
+- llvm-hs-4.0.1.0
+- llvm-hs-pure-4.0.0.0
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (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: ">=1.9"
+#
+# 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

test/Spec.hs

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+import Lib
+
+main :: IO ()
+main 
+    | "Check" == "Check" = putStrLn "Test Passing"
+    | otherwise           = putStrLn "Test Failed"