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Made evaluation-printing more sophisticated

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greg 2017-01-11 22:29:38 -08:00
parent d9ab5a58cf
commit a46ede9395
1 changed files with 13 additions and 1 deletions
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14
src/eval.rs
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@ -133,13 +133,25 @@ impl<'a> Evaluator<'a> {
} }
fn step(&mut self, node: Statement) -> Statement { fn step(&mut self, node: Statement) -> Statement {
let mut trace = String::new();
if self.trace_evaluation { if self.trace_evaluation {
println!("Step: {:?}", node); trace.push_str(&format!("Step: {:?}", node));
} }
let (new_node, side_effect) = self.reduce_astnode(node); let (new_node, side_effect) = self.reduce_astnode(node);
if self.trace_evaluation {
trace.push_str(&format!(" ➜ {:?}", new_node));
}
if let Some(s) = side_effect { if let Some(s) = side_effect {
if self.trace_evaluation {
trace.push_str(&format!(" | side-effect: {:?}", s));
}
self.perform_side_effect(s); self.perform_side_effect(s);
} }
if self.trace_evaluation {
println!("{}", trace);
}
new_node new_node
} }