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BasicParser.hs
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BasicParser.hs
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module BasicParser
where
import Monstupar.Core
import Monstupar.Derived
data BasicExpr = Ignored Expression
| Assigned Variable Expression
| While Expression [BasicExpr]
| If Expression [BasicExpr] [BasicExpr] deriving (Show, Read, Eq)
data Expression = Var Variable | Const Integer deriving (Show, Read, Eq)
type Variable = String
constant :: Monstupar Char Expression
constant = (do
e <- many1 digit
return (Const (read e))
)
variable :: Monstupar Char Variable
variable = (do
e <- letter
es <- many (notOneOf " ;")
return (e : es)
)
onspace = many (oneOf " \n")
expression :: Monstupar Char Expression
expression = (do
e <- variable
return (Var e)
) <|> constant
assignedBasicExpr :: Monstupar Char BasicExpr
assignedBasicExpr = ( do
onspace
e <- variable
onspace
char '='
onspace
es <- expression
onspace
char ';'
return (Assigned e es)
)
ignoredBasicExpr :: Monstupar Char BasicExpr
ignoredBasicExpr = ( do
onspace
e <- expression
onspace
char ';'
return (Ignored e)
)
whileBasicExpr :: Monstupar Char BasicExpr
whileBasicExpr = ( do
onspace
string "while"
onspace
char '('
onspace
e <- expression
onspace
char ')'
onspace
char '{'
onspace
es <- separated basicExpr onspace
onspace
char '}'
return (While e es)
)
ifBasicExpr :: Monstupar Char BasicExpr
ifBasicExpr = (do
onspace
string "if"
onspace
char '('
onspace
e <- expression
onspace
char ')'
onspace
string "then"
onspace
char '{'
onspace
a <- separated basicExpr onspace
onspace
char '}'
onspace
string "else"
onspace
char '{'
onspace
b <- separated basicExpr onspace
onspace
char '}'
onspace
return (If e a b)
)
basicExpr = assignedBasicExpr <|> ignoredBasicExpr <|> whileBasicExpr <|> ifBasicExpr
programmExpr :: Monstupar Char [BasicExpr]
programmExpr = separated basicExpr onspace
testParser s = runParser programmExpr s
tests = [t1,t2,t3, t4, t5, t6, t7, t8]
check = (filter (== False) tests) == []
t1 = runParser constant "1" == Right ("",Const 1)
t2 = runParser variable "abcd1 " == Right (" ","abcd1")
t3 = runParser expression "22342352 3" == Right (" 3",Const 22342352)
t4 = runParser assignedBasicExpr " a = 1;" == Right ("",Assigned "a" (Const 1))
t5 = runParser ignoredBasicExpr " 2345 ;" == Right ("",Ignored (Const 2345))
t6 = runParser whileBasicExpr " while ( 3) { 2; 5; a=4;}" == Right ("",While (Const 3) [Ignored (Const 2),Ignored (Const 5),Ignored (Var "a=4")])
t7 = testParser "a=4; 4; 7; while (6) { i = 3; }" == Right ("",[Ignored (Var "a=4"),Ignored (Const 4),Ignored (Const 7),While (Const 6) [Assigned "i" (Const 3)]])
t8 = runParser ifBasicExpr " if ( 3) then { a =5; c =2;} else {} " == Right ("",If (Const 3) [Assigned "a" (Const 5),Assigned "c" (Const 2)] [])
--new = runParser " if ( 3) then { a =5; c =2;} else {} "