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initial commit w/ lexer & parser

master
Amélia Liao 1 year ago
commit
6f0cef0065
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      Setup.hs
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      cubical.cabal
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      hie.yaml
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      src/Presyntax/Presyntax.hs
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.gitignore View File

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.stack-work/

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LICENSE View File

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Copyright Abigail Magalhães (c) 2021
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 Abigail Magalhães 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.

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README.md View File

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# cubical

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Setup.hs View File

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import Distribution.Simple
main = defaultMain

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cubical.cabal View File

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name: cubical
version: 0.1.0.0
-- synopsis:
-- description:
homepage: https://github.com/plt-hokusai/cubical#readme
license: BSD3
license-file: LICENSE
author: Abigail Magalhães
maintainer: [email protected]
copyright: 2021 Abigail Magalhães
category: Web
build-type: Simple
cabal-version: >=2.0
extra-source-files: README.md
executable cubical
hs-source-dirs: src
main-is: Main.hs
default-language: Haskell2010
build-depends: base ^>= 4.14
, text ^>= 1.2
, array ^>= 0.5.4
, bytestring ^>= 0.10
other-modules: Presyntax.Lexer
, Presyntax.Parser
, Presyntax.Tokens
, Presyntax.Presyntax
build-tool-depends: alex:alex >= 3.2.4 && < 4.0
, happy:happy >= 1.19.12 && < 2.0

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hie.yaml View File

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cradle:
stack:

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src/Main.hs View File

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module Main where
main :: IO ()
main = do
putStrLn "hello world"

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src/Presyntax/Lexer.x View File

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{
module Presyntax.Lexer where
import qualified Data.ByteString.Lazy as Lbs
import qualified Data.Text.Encoding as T
import qualified Data.ByteString as Sbs
import Presyntax.Tokens
}
%wrapper "monad-bytestring"
$alpha = [a-zA-Z]
$digit = [0-9]
tokens :-
$white+ ;
$alpha [$alpha $digit \_ \']* { yield TokVar }
\= { always TokEqual }
\: { always TokColon }
\\ { always TokLambda }
"->" { always TokArrow }
\( { always TokOParen }
\{ { always TokOBrace }
\) { always TokCParen }
\} { always TokCBrace }
{
alexEOF :: Alex Token
alexEOF = do
(AlexPn _ l c, _, _, _) <- alexGetInput
pure $ Token TokEof l c
yield k [email protected](AlexPn _ l c, _, s, _) i = pure (Token (k $! (T.decodeUtf8 (Lbs.toStrict (Lbs.take i s)))) l c)
always k x i = yield (const k) x i
}

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src/Presyntax/Parser.y View File

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{
module Presyntax.Parser where
import qualified Data.Text as T
import Data.Text (Text)
import Presyntax.Presyntax
import Presyntax.Tokens
import Presyntax.Lexer
}
%name parseExp Exp
%tokentype { Token }
%monad { Alex }
%lexer { lexer } { Token TokEof _ _ }
%errorhandlertype explist
%error { parseError }
%token
var { Token (TokVar $$) _ _ }
'(' { Token TokOParen _ _ }
')' { Token TokCParen _ _ }
'{' { Token TokOBrace _ _ }
'}' { Token TokCBrace _ _ }
'\\' { Token TokLambda _ _ }
'->' { Token TokArrow _ _ }
':' { Token TokColon _ _ }
'=' { Token TokEqual _ _ }
%%
Exp :: { Expr }
Exp
: ExpFun Exp { App Ex $1 $2 }
| ExpFun '{' Exp '}' { App Im $1 $3 }
| '\\' LambdaList '->' Exp { makeLams $2 $4 }
| '(' VarList ':' Exp ')' '->' Exp { makePis Ex $2 $4 $7 }
| '{' VarList ':' Exp '}' '->' Exp { makePis Im $2 $4 $7 }
| ExpFun '->' Exp { Pi Ex (T.singleton '_') $1 $3 }
| ExpFun { $1 }
LambdaList :: { [(Plicity, Text)] }
: var { [(Ex, $1)] }
| var LambdaList { (Ex, $1):$2 }
| '{'var'}' { [(Im, $2)] }
| '{'var'}' LambdaList { (Im, $2):$4 }
VarList :: { [Text] }
: var { [$1] }
| var VarList { $1:$2 }
ExpFun :: { Expr }
: Atom { $1 }
| '(' Exp ')' { $2 }
Atom :: { Expr }
: var { Var $1 }
{
lexer cont = alexMonadScan >>= cont
parseError x = alexError (show x)
makeLams xs b = foldr (uncurry Lam) b xs
makePis p xs t b = foldr (flip (Pi p) t) b xs
}

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src/Presyntax/Presyntax.hs View File

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module Presyntax.Presyntax where
import Data.Text (Text)
data Plicity
= Im | Ex
deriving (Eq, Show, Ord)
data Expr
= Var Text
| App Plicity Expr Expr
| Lam Plicity Text Expr
| Pi Plicity Text Expr Expr
deriving (Eq, Show, Ord)
data Statement
= Decl Text Expr
| Defn Text Expr
deriving (Eq, Show, Ord)

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src/Presyntax/Tokens.hs View File

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module Presyntax.Tokens where
import Data.Text (Text)
data TokenClass
= TokVar Text
| TokEof
| TokLambda
| TokArrow
| TokOParen
| TokOBrace
| TokCParen
| TokCBrace
| TokColon
| TokEqual
deriving (Eq, Show, Ord)
data Token
= Token { tokenClass :: TokenClass
, tokStartLine :: !Int
, tokStartCol :: !Int
}
deriving (Eq, Show, Ord)

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#
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# compiler-check: newer-minor

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