-------------------------------------------
Yunus Can Bilge [email protected] 
version 1.0
This compiler is implemented as a Programming Languages and Compilers Course project.
-------------------------------------------
 VC is a Variant of C. It consists of mostly a subset of C plus some language features from Java. 

This project, which consists of a sequence of five programming assignments, can be challenging but fun. It is probably the first time that you write a compiler and run a program that you compiled! In exchange for your hard work, you will learn a lot about programming languages, compilers, software development and how to use programming language expertise to make a large project work better. 

VC grammar : 
program             ->  ( func-decl | var-decl )*

// declarations
func-decl           -> type identifier para-list compound-stmt
var-decl            -> type init-declarator-list ";"
init-declarator-list-> init-declarator ( "," init-declarator )*
init-declarator     -> declarator ( "=" initialiser )? 
declarator          -> identifier 
                    |  identifier "[" INTLITERAL? "]"
initialiser         -> expr 
                    |  "{" expr ( "," expr )* "}"

// primitive types
type                -> void | boolean | int | float

// identifiers
identifier          -> ID 

// statements 
compound-stmt       -> "{" var-decl* stmt* "}" 
stmt                -> compound-stmt
                    |  if-stmt 
                    |  for-stmt
                    |  while-stmt 
                    |  break-stmt
                    |  continue-stmt
                    |  return-stmt
                    |  expr-stmt
if-stmt             -> if "(" expr ")" stmt ( else stmt )?
for-stmt            -> for "(" expr? ";" expr? ";" expr? ")" stmt
while-stmt          -> while "(" expr ")" stmt
break-stmt          -> break ";"
continue-stmt       -> continue ";"
return-stmt         -> return expr? ";"
expr-stmt           -> expr? ";"


// expressions 
expr                -> assignment-expr
assignment-expr     -> ( cond-or-expr "=" )* cond-or-expr
cond-or-expr        -> cond-and-expr 
                    |  cond-or-expr "||" cond-and-expr
cond-and-expr       -> equality-expr 
                    |  cond-and-expr "&&" equality-expr
equality-expr       -> rel-expr
                    |  equality-expr "==" rel-expr
                    |  equality-expr "!=" rel-expr
rel-expr            -> additive-expr
                    |  rel-expr "<" additive-expr
                    |  rel-expr "<=" additive-expr
                    |  rel-expr ">" additive-expr
                    |  rel-expr ">=" additive-expr
additive-expr       -> multiplicative-expr
                    |  additive-expr "+" multiplicative-expr
                    |  additive-expr "-" multiplicative-expr
multiplicative-expr -> unary-expr
                    |  multiplicative-expr "*" unary-expr
                    |  multiplicative-expr "/" unary-expr
unary-expr          -> "+" unary-expr
                    |  "-" unary-expr
                    |  "!" unary-expr
                    |  primary-expr

primary-expr        -> identifier arg-list?
                    | identifier "[" expr "]"
                    | "(" expr ")"
                    | INTLITERAL
                    | FLOATLITERAL
                    | BOOLLITERAL
                    | STRINGLITERAL

// parameters
para-list           -> "(" proper-para-list? ")"
proper-para-list    -> para-decl ( "," para-decl )*
para-decl           -> type declarator
arg-list            -> "(" proper-arg-list? ")"
proper-arg-list     -> arg ( "," arg )*
arg                 -> expr