27 lines
702 B
Rust
27 lines
702 B
Rust
use std::cmp;
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use proc_macro::TokenStream;
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use quote::ToTokens;
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use syn::{Item, Meta};
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use crate::Result;
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pub(super) fn recursion_depth(item: Item, _args: &[Meta]) -> Result<TokenStream> {
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let mut best: usize = 0;
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let mut count: usize = 0;
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// think you'd find a fancy recursive ast visitor? think again
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let tree = format!("{item:#?}");
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for line in tree.lines() {
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let trim = line.trim_start_matches(' ');
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let diff = line.len().saturating_sub(trim.len());
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let level = diff / 4;
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best = cmp::max(level, best);
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count = count.saturating_add(1);
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}
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println!("--- Recursion Diagnostic ---");
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println!("DEPTH: {best}");
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println!("LENGTH: {count}");
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Ok(item.into_token_stream().into())
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}
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