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Provide Position to debug.

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This commit is contained in:
Stephen Chung
2020-12-12 11:47:18 +08:00
parent 5443368359
commit 40b6a014ae
7 changed files with 59 additions and 25 deletions
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12
doc/src/language/print-debug.md
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@@ -22,10 +22,12 @@ When embedding Rhai into an application, it is usually necessary to trap `print`
(for logging into a tracking log, for example) with the `Engine::on_print` and `Engine::on_debug` methods:
```rust
// Any function or closure that takes an '&str' argument can be used to override
// 'print' and 'debug'
// Any function or closure that takes an '&str' argument can be used to override 'print'.
engine.on_print(|x| println!("hello: {}", x));
engine.on_debug(|x| println!("DEBUG: {}", x));
// Any function or closure that takes a '&str' and a 'Position' argument can be used to
// override 'debug'.
engine.on_debug(|x, pos| println!("DEBUG at {:?}: {}", pos, x));
// Example: quick-'n-dirty logging
let logbook = Arc::new(RwLock::new(Vec::<String>::new()));
@@ -35,7 +37,9 @@ let log = logbook.clone();
engine.on_print(move |s| log.write().unwrap().push(format!("entry: {}", s)));
let log = logbook.clone();
engine.on_debug(move |s| log.write().unwrap().push(format!("DEBUG: {}", s)));
engine.on_debug(move |s, pos| log.write().unwrap().push(
format!("DEBUG at {:?}: {}", pos, s)
));
// Evaluate script
engine.eval::<()>(script)?;