Petrichor_Interpreter

A NEW Programming language, that was created by combining the best of C++ and Python 3. Totally built from scratch wihout using any dependecies or libraries. You can check it out in action here: https://repl.it/@vrishinvv/Petrichor-Programming-language#main.py

~Still under development.

Interpeter can understand:

• Basic statments
• Complex mathematical expressions
• If-Elseif-Else construct
• For-Loop construct
• Methods/Function
• Parameterised Functions
• Return Values

Unique Features:

• Local NameSpace handling is inbuilt
• 'Recursion is possible', as you may have already guessed
• 'Error Description Package' built into the tool
• Comes with a sleek 'Auto-Indendation' feature

Features in future udpates:

1. Expanding numbers to hold more than just an integer
2. Key Words will be allowed to be given in small-letter as well

DrawBacks:

1. Error finding tool, is'nt as finished and complete as one we see in modern interpreters, but does a good enough job to impress
2. Arrays/ classes/ have not yet been implemented

GRAMMAR

Currenly looks similar to the C++ style of code, however, the no data type feature of Python has been integrated. I might update syntax of language in future versions

'''

  program:
      FUNC*
  func : 
      FUNC ID (param) compound_statement

  return:
      RETURN exp|empty 

  param: 
      empty|(expr COMMA)*

  compound_statement: 
      BEGIN statement_list END

  statement_list : 
      (
            assignment_statement 
          | empty
          | if_block
          | print 
          | for_block
          |expr
          |return 
      )*

  assignment_statement : 
      variable ASSIGN expr 

  empty :

  print : 
      PRINT( ((str|expr)COMMA)*  )  

  call : 
      CALL ID (param)

  if_block: 
      IF expr 
          compound_statement 
      | (ELSEIF
          compound_statement)*
      | ELSE
          compount_statement
      | empty


  elseif_block:
      ELSEIF expr 
          compound_statement 

  for_block: 
      FOR(assignment_statement; cond; change) 
          compounf_statement


  factor :
       PLUS factor
     | MINUS factor
     | INTEGER
     | LPAREN expr RPAREN
     | variable
     | call

  term: 
      factor (
                  (
                       MUL 
                      | DIV 
                      | LESS_THAN 
                      | LESS_THAN_EQUAL 
                      | EQUALS 
                      | GREATER_THAN 
                      | GREATER_THAN_EQUAL
                  ) 
              factor  
              )*

  expr: 
      term (
              (
                    PLUS 
                  | MINUS
              ) 
           term
           )*


  variable: 
      ID 

'''

RULES

• Variables declared within a 'compound_statement' are local to that compound_statement
• redeclaring / aka reinitialising a variable inside a compound_statement(CS) will be considered as updation ONLY
• As of now, string objects cannot be assigned to variables, they take up ONLY integers
• There must be a "MAIN" function, Yes in caps, in your program