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module examples::calc::Syntax

rascal-0.34.0
typepal-0.8.10

Usage​

import examples::calc::Syntax;

Source code​

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

Dependencies​

extend examples::CommonLex;

syntax Calc​

start syntax Calc
    = Decl+                     ❷  
    ;

syntax Decl​

syntax Decl
    = "var" Id "=" Exp ";"      ❸  
    ;

syntax Exp​

syntax Exp 
   = Id                                 ❹  
   | Integer                            ❺  
   | Boolean                            ❻  
   | bracket "(" Exp ")"                ❼  
   > left Exp "*" Exp                   ❽                                 
   > left Exp "+" Exp                   ❾  
   > "if" Exp "then" Exp "else" Exp     ❶⓿  
   ;

syntax Reserved​

keyword Reserved
    = "var" | "if" | "then" | "else"
    ;