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Make it easier to define high-level ASTs? #136

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oxalica opened this issue Jul 21, 2022 · 0 comments

oxalica commented Jul 21, 2022

Currently we provides traits and auxiliary functions in rowan::ast, but it's still difficult to use.

In the example, we define ASTs using a custom macro.

rowan/examples/s_expressions.rs

Lines 268 to 270 in 6a94212

ast_node!(Root, ROOT);

ast_node!(Atom, ATOM);

ast_node!(List, LIST);
In rust-analyzer, we even use code generation to produce a 4.8k lines file crates/syntax/src/ast/generated/nodes.rs.

Could we make it easier to define ASTs and child extractors?
Maybe using some DSL with proc-macros or build.rs for generation?

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