module IBAF-Start
            
imports 
  IBAF-Statements
  IBAF-Expressions
  Funcons

// Language "IBAFlang"
    
lexical syntax // Language
  LEX-keyword = "else"
  LEX-keyword = "false"
  LEX-keyword = "if"
  LEX-keyword = "true"
  LEX-keyword = "while"
  LEX-keyword = "int"
  
syntax // Language
  
context-free syntax // Language
  L-start.L-start--L-statement-S =
    L-statement*
  
  L-keyword.LEX-keyword =
    LEX-keyword
  
context-free syntax // Semantics
  FCT.T-start =
    "start" "[:" L-start ":]"
  FCT-Quoted.LEX-keyword = LEX-keyword
  
context-free syntax // Desugaring
  
variables // Meta-variables
  L-start = "(:START" [1-9]? ":)" {prefer}
  L-start? = "(:START" [1-9]? "?:)" {prefer}
  L-start* = "(:START" [1-9]? "*:)" {prefer}
  L-start+ = "(:START" [1-9]? "+:)" {prefer}
  L-statement* = "..." [1-9]? {prefer}
  
// SDF comments
  
  lexical syntax 
    LEX-id = LEX-keyword {reject}
  lexical restrictions
    LEX-id -/- [A-Za-z0-9]
  
  context-free syntax
  L-exp.L-exp--L-exp-PLUS-L-exp =
    L-exp "+" L-exp
    {assoc}
  L-exp.L-exp--L-exp-AMPERSAND-AMPERSAND-L-exp =
    L-exp "&&" L-exp
   {assoc}
  
sorts // ASTs
  T-start