Displaying the Output
To display the output from the interpreter, we should write some codes. The code should first call the lexer, then the parser and then the interpreter and finally retrieves the output. The output in then displayed on to the shell.
Python3
if __name__ == '__main__': lexer = BasicLexer() parser = BasicParser() print('GFG Language') env = {} while True: try: text = input('GFG Language > ') except EOFError: break if text: tree = parser.parse(lexer.tokenize(text)) BasicExecute(tree, env) |
It is necessary to know that we haven’t handled any errors. So SLY is going to show it’s error messages whenever you do something that is not specified by the rules you have written.
Execute the program you have written using,
python you_program_name.py
How to Create a Programming Language using Python?
In this article, we are going to learn how to create your own programming language using SLY(Sly Lex Yacc) and Python. Before we dig deeper into this topic, it is to be noted that this is not a beginner’s tutorial and you need to have some knowledge of the prerequisites given below.
Prerequisites
- Rough knowledge about compiler design.
- Basic understanding of lexical analysis, parsing and other compiler design aspects.
- Understanding of regular expressions.
- Familiarity with Python programming language.
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