We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
RustConf 2023 - Anything you can do, I can do worse with macro_rules!
Simplify complex macro development with Rust's `macro_rules!` by leveraging callbacks, token trees, and incremental parsing to transform syntax and parse large inputs.
- Macros can be complex and difficult to debug, but callbacks can simplify the process.
- Recursion is a key concept in macros, and it’s used to build a recursive tree of token matching.
-
Tokens can be parsed using repetitive patterns, such as
repetition specifierwhich includes?,*, and+. - Incremental token tree munchers are useful for parsing large inputs by breaking them down into smaller chunks.
- Pushdown accumulation allows for accumulating tokens in intermediate states.
- The XML parsing macros are a good example of how macros can be used to transform a syntax.
- Declarative macros are another type of macro that can be used, but they are difficult to debug.
- Macro rules cannot be recursive, ambiguous, or violate Rust parsing ambiguity rules.
- Descriptive names are important for macros, and using them can simplify debugging.
- Internal rules are necessary for creating a consistent framework for macros.
- Token tree bundling is a way to combine tokens into a single token tree.
- Fragments and token trees can be used to simplify complex parsing operations.
- Callbacks can be used to simplify the process of parsing complex inputs.
- Debugging macros can be challenging, but using descriptive names and a consistent framework can make it easier.