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use std::error::Error;
use std::io::{self, Read};
use term_painter::ToStyle;
const ERROR_STYLE: term_painter::Color = term_painter::Color::Red;
const BOLD: term_painter::Attr = term_painter::Attr::Bold;
fn print_error(message: &str, source: &str, start: usize, end: usize) {
let line_number = bytecount::count(source[..start].as_bytes(), b'\n');
let line_start = source[..start].rfind('\n').map(|i| i + 1).unwrap_or(0);
let line_end = source[end..].find('\n').unwrap_or(0) + end;
let context_prefix = &source[line_start..start];
let context_highlighted = &source[start..end];
let context_suffix = &source[end..line_end];
let line_number_str = line_number.to_string();
let line_number_width = line_number_str.len();
BOLD.with(|| {
ERROR_STYLE.with(|| {
print!("error: ");
});
println!("{}", message);
});
BOLD.with(|| {
print!(" -->");
});
println!(" (stdin):{}:0", line_number);
BOLD.with(|| {
println!("{:w$} |", "", w = line_number_width);
print!("{} |", line_number_str);
});
print!(" {}", context_prefix);
BOLD.with(|| {
ERROR_STYLE.with(|| {
print!("{}", context_highlighted);
});
});
println!("{}", context_suffix);
BOLD.with(|| {
print!("{:w$} |", "", w = line_number_width);
ERROR_STYLE.with(|| {
println!(
" {:so$}{:^>ew$}",
"",
"",
so = source[line_start..start].chars().count(),
ew = ::std::cmp::max(1, source[start..end].chars().count())
);
});
});
}
fn main() {
let mut buffer = String::new();
io::stdin().read_to_string(&mut buffer).unwrap();
let expr = match dhall::expr::Parsed::load_from_str(&buffer) {
Ok(expr) => expr,
Err(e) => {
print_error(&format!("Parse error {}", e), &buffer, 0, 0);
return;
}
};
let expr = expr.resolve().unwrap();
let expr = match expr.typecheck() {
Ok(expr) => expr,
Err(e) => {
let explain = ::std::env::args().any(|s| s == "--explain");
if !explain {
term_painter::Color::BrightBlack.with(|| {
println!("Use \"dhall --explain\" for detailed errors");
});
}
ERROR_STYLE.with(|| print!("Error: "));
println!("{}", e.type_message.description());
if explain {
println!("{}", e.type_message);
}
println!("{}", e.current);
// FIXME Print source position
return;
}
};
let expr = expr.normalize();
println!("{}", expr);
}
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