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Toy compiler performs basic mathematical calculations like addition, subtraction, multiplication and division.
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The code uses RPLY python package to implement lexer and Parser using LexerGenerator and ParserGenerator modules.
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Parsing also follows precedence rule defined by BODMAS and does not have any limitations on number of operands and digits in the operands. EBNF is used to define the grammar.
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The code is divided in 3 modules. Each module contains Parser, Lexer and AST tree builder.
- Any OS with Python 2 interpreter
- Python IDE (Pycharm)
- Run the program by executing
Main.pyfile in Pycharm - Provide the input in following format: Input follows the grammer "PRINT LEFT_PAREN expression RIGHT_PAREN EOL" and format should be followed.
print(45+22-9);print(4*2-1);print(2*8/4);print(6/3*2+12);