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Tasks for Building a Transpiler

https://en.wikipedia.org/wiki/GW-BASIC

1. Lexical Analyzer (Tokenizer)

  • Implement a lexical analyzer to split the input code into "tokens" (also known as "lexemes").
    • Use a while loop with string comparisons or regular expressions for tokenization.
    • Define the token types (e.g., keywords, operators, identifiers, literals).

2. Parser

  • Implement a parser to process the list/stream of tokens.
    • Create an Abstract Syntax Tree (AST) based on a predefined grammar.
    • Use a parsing technique, such as recursive descent, to build the AST.
    • Ensure the AST accurately represents the semantics of the program.

3. Backend Code Generation

  • Implement the backend to translate the AST into your target language.
    • Option 1: Translate the AST into an intermediate AST that represents the target language.
    • Option 2: Directly generate code from the source AST and convert it into the target language.
    • Ensure the generated code is syntactically correct and can be compiled or interpreted by the target language's tools.

4. Testing and Debugging

  • Test the transpiler with simple example programs in the source language.
    • Verify that the tokenization, parsing, and code generation steps work as expected.
    • Debug any issues that arise during the translation process.
  • Validate the output code by running it in the target environment.
    • Ensure the behavior of the generated code matches the intended behavior of the original code.