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