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Commit 96af91ae authored by pm3g19's avatar pm3g19
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Basic version of let works

parent 88cba6ba
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Interpreter.hs
View file @ 96af91ae
......@@ -16,7 +16,8 @@ main = do
args <- getArgs
case args of
(srcname:_) -> interpret srcname
_ -> interpret "solutions/pr2.cql"
--_ -> interpret "solutions/pr3.cql"
_ -> interpret "sampleprogram.txt"
interpret :: FilePath -> IO () -- the main function, takes in file name, prints out result
......
Lexer.x
View file @ 96af91ae
......@@ -21,6 +21,10 @@ isEmpty {\p s -> TokenIsEmpty p }
filter {\p s -> TokenFilter p }
true {\p s -> TokenTrue p }
false {\p s -> TokenFalse p }
let {\p s -> TokenLet p }
if {\p s -> TokenIf p }
else {\p s -> TokenElse p }
then {\p s -> TokenThen p }
\.in {\p s -> TokenInSet p }
\.out {\p s -> TokenOutSet p }
\[ {\p s -> TokenLeftSqBracket p }
......@@ -28,7 +32,8 @@ false {\p s -> TokenFalse p }
"->" {\p s -> TokenArrow p }
"==" {\p s -> TokenisEqual p }
"/=" {\p s -> TokenisNotEqual p }
"+" {\p s -> TokenPlus p }
"+" {\p s -> TokenPlus p }
\= {\p s -> TokenEqual p }
\( {\p s -> TokenLeftBracket p }
\) {\p s -> TokenRightBracket p }
\: {\p s -> TokenCol p }
......@@ -37,11 +42,11 @@ false {\p s -> TokenFalse p }
\, {\p s -> TokenComma p }
\. {\p s -> TokenFullStop p }
x {\p s -> TokenXProduct p }
xx {\p s -> TokenXXProduct p }
xx {\p s -> TokenXXProduct p }
map {\p s -> TokenMap p }
$lower [$lower $digit \_ \']* {\p s -> TokenVarName p s }
$upper[$alpha]* {\p s -> TokenSetName p s }
--$posDigit$digit* {\p s -> TokenPosNat p (read s) }
--$posDigit$digit* {\p s -> TokenPosNat p (read s) }
$digit+ {\p s -> TokenNat p (read s) }
\"[$alpha $digit]+\" {\p s -> TokenString p (init.tail $ s) }
......@@ -50,11 +55,11 @@ $digit+ {\p s -> TokenNat p (read s) }
--token type:
data Token =
TokenFilter AlexPosn |
TokenIsEmpty AlexPosn |
TokenContains AlexPosn |
TokenIsEmpty AlexPosn |
TokenContains AlexPosn |
TokenSetName AlexPosn String |
TokenNat AlexPosn Int |
TokenPosNat AlexPosn Int |
TokenPosNat AlexPosn Int |
TokenVarName AlexPosn String |
TokenTrue AlexPosn |
TokenFalse AlexPosn |
......@@ -64,19 +69,24 @@ data Token =
TokenArrow AlexPosn |
TokenisEqual AlexPosn |
TokenisNotEqual AlexPosn |
TokenPlus AlexPosn |
TokenPlus AlexPosn |
TokenLeftBracket AlexPosn |
TokenRightBracket AlexPosn |
TokenSemiCol AlexPosn |
TokenCol AlexPosn |
TokenCol AlexPosn |
TokenLambda AlexPosn |
TokenComma AlexPosn |
TokenFullStop AlexPosn |
TokenInSet AlexPosn |
TokenXProduct AlexPosn |
TokenXXProduct AlexPosn |
TokenXXProduct AlexPosn |
TokenOutSet AlexPosn |
TokenMap AlexPosn
TokenMap AlexPosn |
TokenLet AlexPosn |
TokenIf AlexPosn |
TokenElse AlexPosn |
TokenThen AlexPosn |
TokenEqual AlexPosn
deriving (Eq, Show)
......@@ -111,5 +121,9 @@ pos token = case token of
(TokenXXProduct p ) -> p
(TokenOutSet p ) -> p
(TokenMap p) -> p
(TokenLet p) -> p
(TokenElse p) -> p
(TokenIf p) -> p
(TokenThen p) -> p
(TokenEqual p) -> p
}
\ No newline at end of file
Parser.y
View file @ 96af91ae
......@@ -9,7 +9,6 @@ import CSV
%tokentype {Token}
%error {parseError}
--\\map(\r -> r[1,2,3])
%token
filter { TokenFilter _ }
......@@ -17,7 +16,7 @@ import CSV
out { TokenOutSet _ }
SetName { TokenSetName _ $$ }
Nat { TokenNat _ $$ }
PosNat { TokenPosNat _ $$ }
PosNat { TokenPosNat _ $$ }
VarName { TokenVarName _ $$ }
true { TokenTrue _ }
false { TokenFalse _ }
......@@ -44,16 +43,21 @@ import CSV
contains { TokenContains _ }
-- isSubstring { TokenIsSubstring _ }
isEmpty { TokenIsEmpty _ }
let { TokenLet _}
if { TokenIf _}
else { TokenElse _}
then { TokenThen _}
'=' { TokenEqual _}
%right "->"
%left "/=" "==" ';'
%right '+'
%nonassoc '('
%%
Prog : in SetDecls out SetFuncCalls {($2,$4)}
SetDecl : SetName':'PosNat {$1}
SetDecl : SetName':'Nat {$1}
SetDecls : SetDecl {[$1]}
| SetDecls','SetDecl {$3:$1}
......@@ -64,35 +68,38 @@ SetNames : SetName {[$1]}
VarNames : VarName {[$1]}
| VarName ',' VarNames {$1:$3}
SetFuncCalls : SetFuncCall';' {[$1]}
| SetFuncCall';' SetFuncCalls {$1:$3}
SetFuncCalls : SetFuncCall';' {[$1]}
| SetFuncCall';' SetFuncCalls {$1:$3}
SetFuncCall : filter '['SetName']' '('Func')' {FuncCall (PredefFunc Filter) [Var $3] [$6]}
| filter '('Func')' {FuncCall (PredefFunc Filter) [] [$3]}
--| map '['SetName']' '('Func')' {FuncCall (PredefFunc Map) [Var $3] [$6]}
| map '('Func')' {FuncCall (PredefFunc Map) [] [$3]}
SetFuncCall : filter '['SetName']' '('Expr')' {FuncCall (PredefFunc Filter) [Var $3] [$6]}
| filter '('Expr')' {FuncCall (PredefFunc Filter) [] [$3]}
--| map '['SetName']' '('Expr')' {FuncCall (PredefFunc Map) [Var $3] [$6]}
| map '('Expr')' {FuncCall (PredefFunc Map) [] [$3]}
| SetName x SetName {FuncCall (PredefFunc XProduct) (map Var [$1, $3]) []}
Func : '\\' '(' VarNames ')' "->" Expr { FuncDef [] $3 $6 }
Expr : Expr "==" Expr {FuncCall (PredefFunc IsEqual) [] [$1, $3]}
| Expr'['Nat']' {FuncCall (PredefFunc RecordIndex) [] [$1, Types.Int $3]}
| Expr'['Nat','Nats']' {FuncCall (PredefFunc RecordSelect) [] ($1:(map Types.Int ($3:$5))) }
| Function'('Exprs')' {FuncCall $1 [] $3}
| Str {Types.String $ stripWhitespace $1}
| VarName {Var $1}
| Record {$1}
| true {Boolean True}
| false {Boolean False}
| let VarName '=' Expr {Let $2 $4}
Expr : Expr "==" Expr {FuncCall (PredefFunc IsEqual) [] [$1, $3]}
| Expr'['Nat']' {FuncCall (PredefFunc RecordIndex) [] [$1, Types.Int $3]}
| Expr'['Nat','Nats']' {FuncCall (PredefFunc RecordSelect) [] ($1:(map Types.Int ($3:$5))) }
| Function'('Exprs')' {FuncCall $1 [] $3}
| '\\' '(' VarNames ')' "->" Expr { FuncDef [] $3 $6 }
| if Expr then Expr else Expr {If $2 $4 $6}
| Str {Types.String $ stripWhitespace $1}
| VarName {Var $1}
| Record {$1}
| true {Boolean True}
| false {Boolean False}
| '(' Expr ')' {$2}
--TODO brackets
Function : PredefFunc {PredefFunc $1}
| VarName { Var $1}
PredefFunc : isEmpty {IsEmpty}
-- | isSubstring {IsSubstring}
| contains {Contains}
| isEmpty {IsEmpty}
-- | zip {Zip}
-- | Map
-- | Mapr
......@@ -107,6 +114,7 @@ Nats : Nat {[$1]}
| Nat ',' Nats {$1:$3}
{
parseError :: [Token] -> a
parseError tokens = error $ "Parse error: " ++ (show.pos.head) tokens
......
Types.hs
View file @ 96af91ae
......@@ -12,6 +12,8 @@ data PredefFunc = XProduct | XXProduct | IsEqual | IsNotEqual | Plus --operators
| RecordIndex -- [] operator
| RecordSelect
| IsEmpty | NotEmpty | Contains -- string functions
| And
| Or
deriving (Show, Eq)
......@@ -24,7 +26,6 @@ data PredefFunc = XProduct | XXProduct | IsEqual | IsNotEqual | Plus --operators
data Expr = Control Expr [Expr] -- result of last computation, sequence of instructions
| FuncCall {func::Expr, inputSets::[Expr], args::[Expr]} -- args: function to call, input sets, extra argument. Applicable for all kinds of functions: the set functions e.g. filter, map or simple functions or even the operators e.g. ==, /= ! We don't define separate expr for each operator
| FuncDef {inputSetNames::[SymbolName], argsNames::[SymbolName], body::Expr} -- function definition
| If Expr Expr Expr
| Set [Expr]
......
sampleprogram.txt
View file @ 96af91ae
.in
SampleSet
SampleSet:4
.out
filter (\(r) -> r[0] == "hello")
\ No newline at end of file
let f = \(r) -> r[1] == "hello";
filter[SampleSet](f);
\ No newline at end of file
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