rhai/examples/rhai_runner.rs

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use rhai::{Engine, EvalAltResult};
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#[cfg(not(feature = "no_optimize"))]
use rhai::OptimizationLevel;
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use std::{env, fs::File, io::Read, process::exit};
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fn eprint_error(input: &str, err: EvalAltResult) {
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fn eprint_line(lines: &[&str], line: usize, pos: usize, err: &str) {
let line_no = format!("{}: ", line);
let pos_text = format!(" (line {}, position {})", line, pos);
eprintln!("{}{}", line_no, lines[line - 1]);
eprintln!(
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"{:>1$} {2}",
"^",
line_no.len() + pos,
err.replace(&pos_text, "")
);
eprintln!("");
}
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let lines: Vec<_> = input.split('\n').collect();
// Print error
let pos = err.position();
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match pos {
p if p.is_none() => {
// No position
eprintln!("{}", err);
}
p => {
// Specific position
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let err_text = match err {
EvalAltResult::ErrorRuntime(err, _) if !err.is_empty() => {
format!("Runtime error: {}", err)
}
err => err.to_string(),
};
eprint_line(&lines, p.line().unwrap(), p.position().unwrap(), &err_text)
}
}
}
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fn main() {
for filename in env::args().skip(1) {
let mut engine = Engine::new();
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#[cfg(not(feature = "no_optimize"))]
engine.set_optimization_level(OptimizationLevel::Full);
let mut f = match File::open(&filename) {
Err(err) => {
eprintln!("Error reading script file: {}\n{}", filename, err);
exit(1);
}
Ok(f) => f,
};
let mut contents = String::new();
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if let Err(err) = f.read_to_string(&mut contents) {
eprintln!("Error reading script file: {}\n{}", filename, err);
exit(1);
}
if let Err(err) = engine.consume(&contents) {
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eprintln!("{:=<1$}", "", filename.len());
eprintln!("{}", filename);
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eprintln!("{:=<1$}", "", filename.len());
eprintln!("");
eprint_error(&contents, *err);
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}
}
}