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module examples::fun::Syntax

rascal-0.34.0
typepal-0.8.10

Usage​

import examples::fun::Syntax;

Source code​

http://github.com/usethesource/typepal/src/examples/fun/Syntax.rsc

Dependencies​

extend examples::CommonLex;

syntax Fun​

start syntax Fun
    = Expression
    ;

syntax Type​

syntax Type 
   = "bool"
   | "int"
   | "str"
   | left Type from "-\>" Type to
   ;

syntax Expression​

syntax Expression 
   = Id name
   | Integer intcon 
   | Boolean boolcon
   | String strcon
   | bracket "(" Expression e ")"                   
    > left Expression lhs "+" Expression rhs                                          
    > left Expression lhs "&&" Expression rhs  
   | "fun" Id name ":" Type tp "{" Expression exp "}"
   >  left Expression exp1 "(" Expression exp2  ")"
   | "let" Id name ":" Type tp "=" Expression exp1 "in" Expression exp2 "end"
   | "if" Expression cond "then" Expression thenPart "else" Expression elsePart "fi" 
   ;

syntax Reserved​

keyword Reserved 
    = "if" | "then" | "else" | "fi" | 
      "let" | "in" | "fun" | "end" |
      "int" | "bool"
    ;