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import std::{io, term};
import io::writer_util;
import syntax::codemap;
import codemap::span;
export emitter, emit;
export level, fatal, error, warning, note;
export handler, mk_handler;
export ice_msg;
type emitter = fn@(cmsp: option<(codemap::codemap, span)>,
msg: str, lvl: level);
iface handler {
fn span_fatal(sp: span, msg: str) -> !;
fn fatal(msg: str) -> !;
fn span_err(sp: span, msg: str);
fn err(msg: str);
fn has_errors() -> bool;
fn abort_if_errors();
fn span_warn(sp: span, msg: str);
fn warn(msg: str);
fn span_note(sp: span, msg: str);
fn note(msg: str);
fn span_bug(sp: span, msg: str) -> !;
fn bug(msg: str) -> !;
fn span_unimpl(sp: span, msg: str) -> !;
fn unimpl(msg: str) -> !;
}
type codemap_t = @{
cm: codemap::codemap,
mutable err_count: uint,
emit: emitter
};
impl codemap_handler of handler for codemap_t {
fn span_fatal(sp: span, msg: str) -> ! {
self.emit(some((self.cm, sp)), msg, fatal);
fail;
}
fn fatal(msg: str) -> ! {
self.emit(none, msg, fatal);
fail;
}
fn span_err(sp: span, msg: str) {
self.emit(some((self.cm, sp)), msg, error);
self.err_count += 1u;
}
fn err(msg: str) {
self.emit(none, msg, error);
self.err_count += 1u;
}
fn has_errors() -> bool { self.err_count > 0u }
fn abort_if_errors() {
if self.err_count > 0u {
self.fatal("aborting due to previous errors");
}
}
fn span_warn(sp: span, msg: str) {
self.emit(some((self.cm, sp)), msg, warning);
}
fn warn(msg: str) {
self.emit(none, msg, warning);
}
fn span_note(sp: span, msg: str) {
self.emit(some((self.cm, sp)), msg, note);
}
fn note(msg: str) {
self.emit(none, msg, note);
}
fn span_bug(sp: span, msg: str) -> ! {
self.span_fatal(sp, ice_msg(msg));
}
fn bug(msg: str) -> ! {
self.fatal(ice_msg(msg));
}
fn span_unimpl(sp: span, msg: str) -> ! {
self.span_bug(sp, "unimplemented " + msg);
}
fn unimpl(msg: str) -> ! { self.bug("unimplemented " + msg); }
}
fn ice_msg(msg: str) -> str {
#fmt["internal compiler error %s", msg]
}
fn mk_handler(cm: codemap::codemap,
emitter: option<emitter>) -> handler {
let emit = alt emitter {
some(e) { e }
none {
let f = fn@(cmsp: option<(codemap::codemap, span)>,
msg: str, t: level) {
emit(cmsp, msg, t);
};
f
}
};
@{
cm: cm,
mutable err_count: 0u,
emit: emit
} as handler
}
enum level {
fatal,
error,
warning,
note,
}
fn diagnosticstr(lvl: level) -> str {
alt lvl {
fatal { "error" }
error { "error" }
warning { "warning" }
note { "note" }
}
}
fn diagnosticcolor(lvl: level) -> u8 {
alt lvl {
fatal { term::color_bright_red }
error { term::color_bright_red }
warning { term::color_bright_yellow }
note { term::color_bright_green }
}
}
fn print_diagnostic(topic: str, lvl: level, msg: str) {
if str::is_not_empty(topic) {
io::stdout().write_str(#fmt["%s ", topic]);
}
if term::color_supported() {
term::fg(io::stdout(), diagnosticcolor(lvl));
}
io::stdout().write_str(#fmt["%s:", diagnosticstr(lvl)]);
if term::color_supported() {
term::reset(io::stdout());
}
io::stdout().write_str(#fmt[" %s\n", msg]);
}
fn emit(cmsp: option<(codemap::codemap, span)>,
msg: str, lvl: level) {
alt cmsp {
some((cm, sp)) {
let ss = codemap::span_to_str(sp, cm);
let lines = codemap::span_to_lines(sp, cm);
print_diagnostic(ss, lvl, msg);
highlight_lines(cm, sp, lines);
}
none {
print_diagnostic("", lvl, msg);
}
}
}
fn highlight_lines(cm: codemap::codemap, sp: span,
lines: @codemap::file_lines) {
// If we're not looking at a real file then we can't re-open it to
// pull out the lines
if lines.name == "-" { ret; }
// FIXME: reading in the entire file is the worst possible way to
// get access to the necessary lines.
let file = alt io::read_whole_file_str(lines.name) {
result::ok(file) { file }
result::err(e) {
// Hard to report errors while reporting an error
ret;
}
};
let fm = codemap::get_filemap(cm, lines.name);
// arbitrarily only print up to six lines of the error
let max_lines = 6u;
let elided = false;
let display_lines = lines.lines;
if vec::len(display_lines) > max_lines {
display_lines = vec::slice(display_lines, 0u, max_lines);
elided = true;
}
// Print the offending lines
for line: uint in display_lines {
io::stdout().write_str(#fmt["%s:%u ", fm.name, line + 1u]);
let s = codemap::get_line(fm, line as int, file);
if !str::ends_with(s, "\n") { s += "\n"; }
io::stdout().write_str(s);
}
if elided {
let last_line = display_lines[vec::len(display_lines) - 1u];
let s = #fmt["%s:%u ", fm.name, last_line + 1u];
let indent = str::char_len(s);
let out = "";
while indent > 0u { out += " "; indent -= 1u; }
out += "...\n";
io::stdout().write_str(out);
}
// If there's one line at fault we can easily point to the problem
if vec::len(lines.lines) == 1u {
let lo = codemap::lookup_char_pos(cm, sp.lo);
let digits = 0u;
let num = (lines.lines[0] + 1u) / 10u;
// how many digits must be indent past?
while num > 0u { num /= 10u; digits += 1u; }
// indent past |name:## | and the 0-offset column location
let left = str::char_len(fm.name) + digits + lo.col + 3u;
let s = "";
while left > 0u { str::push_char(s, ' '); left -= 1u; }
s += "^";
let hi = codemap::lookup_char_pos(cm, sp.hi);
if hi.col != lo.col {
// the ^ already takes up one space
let width = hi.col - lo.col - 1u;
while width > 0u { str::push_char(s, '~'); width -= 1u; }
}
io::stdout().write_str(s + "\n");
}
}
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