grammar/grammar.txt

   1 <Prog>         ::= <FunDecl>+
   2 <FunDecl>      ::= <id> '(' <Type>* ')' ['::' <FunType] '{' <VarDecl>* <Stmt>+ '}'
   3 <FunType>      ::= <VoidType> ['->' <FunType>]
   4 <Stmt>         ::= 'if' '(' <Expr> ')' '{' <Stmt>* '}' ['else' '{' <Stmt>* '}']
   5                  | 'while' '(' <Expr> ')' '{' <Stmt>* '}'
   6                  | <id> <FieldSels> '=' <Expr> ';'
   7                  | <FunCall> ';'
   8                  | 'return' [<Expr>] ';'
   9 <VarDecl>      ::= <Type> <id> '=' <Expr> ';'
  10 <Expr>         ::= <BinOrExpr> [':' <Expr>]
  11 <BinOrExpr>    ::= <BinAndExpr> ['||' <BinOrExpr>]
  12 <BinAndExpr>   ::= <CompareExpr> ['&&' <BinAndExpr>]
  13 <CompareExpr>  ::= <PlusMinExpr> [('==' | '<' | '>' | '<=' | '>=' | '!=') <CompareExpr>]
  14 <PlusMinExpr>  ::= <TimesDivExpr> (('+' | '-') <TimesDivExpr>)*
  15 <TimesDivExpr> ::= <BasicExpr> (['*' | '/' | '%'] <BasicExpr>)*
  16 <BasicExpr>    ::= <Op1> <Expr>
  17                  | <int>
  18                  | <char>
  19                  | 'False'
  20                  | 'True'
  21                  | '(' <Expr> ')'
  22                  | <FunCall> <FieldSels>
  23                  | '[]' <Expr>
  24                  | '(' <Expr> ',' <Expr> ')'
  25 <FieldSels>    ::= ('.' ('hd'|'tl'|'fst'|'snd))*
  26 <FunCall>      ::= <id> ['(' <ActArgs>+ ')']
  27 <ActArgs>      ::= <Expr> [',' ActArgs]
  28 <Type>         ::= 'Int'
  29                  | 'Bool'
  30                  | 'Char'
  31                  | '(' Type ',' Type ')'
  32                  | '[' Type ']'
  33                  | <id>
  34 <VoidType>     ::= 'Void' | Type