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import std::ivec;
import std::uint;
import std::str;
import std::termivec;
import std::ioivec;
import std::option;
import std::option::some;
import std::option::none;
type filename = str;
type file_pos = rec(uint ch, uint byte);
/* A codemap is a thing that maps uints to file/line/column positions
* in a crate. This to make it possible to represent the positions
* with single-word things, rather than passing records all over the
* compiler.
*/
type filemap = @rec(filename name, file_pos start_pos,
mutable file_pos[] lines);
type codemap = @rec(mutable filemap[] files);
type loc = rec(filename filename, uint line, uint col);
fn new_codemap() -> codemap {
ret @rec(mutable files=~[]);
}
fn new_filemap(filename filename, uint start_pos_ch, uint start_pos_byte)
-> filemap {
ret @rec(name=filename, start_pos=rec(ch=start_pos_ch,
byte=start_pos_byte),
mutable lines=~[rec(ch=start_pos_ch, byte=start_pos_byte)]);
}
fn next_line(filemap file, uint chpos, uint byte_pos) {
file.lines += ~[rec(ch=chpos, byte=byte_pos)];
}
type lookup_fn = fn (file_pos pos) -> uint;
fn lookup_pos(codemap map, uint pos, lookup_fn lookup) -> loc {
auto a = 0u;
auto b = ivec::len(map.files);
while (b - a > 1u) {
auto m = (a + b) / 2u;
if (lookup(map.files.(m).start_pos) > pos) { b = m; } else { a = m; }
}
auto f = map.files.(a);
a = 0u;
b = ivec::len(f.lines);
while (b - a > 1u) {
auto m = (a + b) / 2u;
if (lookup(f.lines.(m)) > pos) { b = m; } else { a = m; }
}
ret rec(filename=f.name, line=a + 1u, col=pos - lookup(f.lines.(a)));
}
fn lookup_char_pos(codemap map, uint pos) -> loc {
fn lookup(file_pos pos) -> uint { ret pos.ch; }
ret lookup_pos(map, pos, lookup);
}
fn lookup_byte_pos(codemap map, uint pos) -> loc {
fn lookup(file_pos pos) -> uint { ret pos.byte; }
ret lookup_pos(map, pos, lookup);
}
type span = rec(uint lo, uint hi);
fn span_to_str(&span sp, &codemap cm) -> str {
auto lo = lookup_char_pos(cm, sp.lo);
auto hi = lookup_char_pos(cm, sp.hi);
ret #fmt("%s:%u:%u:%u:%u", lo.filename, lo.line, lo.col, hi.line, hi.col);
}
fn emit_diagnostic(&option::t[span] sp, &str msg, &str kind, u8 color,
&codemap cm) {
auto ss = "<input>:0:0:0:0";
let option::t[@file_lines] maybe_lines = none;
alt (sp) {
case (some(?ssp)) {
ss = span_to_str(ssp, cm);
maybe_lines = some(span_to_lines(ssp, cm));
}
case (none) { }
}
ioivec::stdout().write_str(ss + ": ");
if (termivec::color_supported()) {
termivec::fg(ioivec::stdout().get_buf_writer(), color);
}
ioivec::stdout().write_str(#fmt("%s:", kind));
if (termivec::color_supported()) {
termivec::reset(ioivec::stdout().get_buf_writer());
}
ioivec::stdout().write_str(#fmt(" %s\n", msg));
alt (maybe_lines) {
case (some(?lines)) {
// FIXME: reading in the entire file is the worst possible way to
// get access to the necessary lines.
auto rdr = ioivec::file_reader(lines.name);
auto file = str::unsafe_from_bytes_ivec(rdr.read_whole_stream());
auto fm = get_filemap(cm, lines.name);
// arbitrarily only print up to six lines of the error
auto max_lines = 6u;
auto elided = false;
auto display_lines = lines.lines;
if (ivec::len(display_lines) > max_lines) {
display_lines = ivec::slice(display_lines, 0u, max_lines);
elided = true;
}
// Print the offending lines
for (uint line in display_lines) {
ioivec::stdout().write_str(#fmt("%s:%u ", fm.name,
line + 1u));
auto s = get_line(fm, line as int, file);
if (!str::ends_with(s, "\n")) {
s += "\n";
}
ioivec::stdout().write_str(s);
}
if (elided) {
auto last_line = display_lines.(ivec::len(display_lines) -
1u);
auto s = #fmt("%s:%u ", fm.name, last_line + 1u);
auto indent = str::char_len(s);
auto out = "";
while (indent > 0u) { out += " "; indent -= 1u; }
out += "...\n";
ioivec::stdout().write_str(out);
}
// If there's one line at fault we can easily point to the problem
if (ivec::len(lines.lines) == 1u) {
auto lo = lookup_char_pos(cm, option::get(sp).lo);
auto digits = 0u;
auto num = lines.lines.(0) / 10u;
// how many digits must be indent past?
while (num > 0u) { num /= 10u; digits += 1u; }
// indent past |name:## | and the 0-offset column location
auto left = str::char_len(fm.name) + digits + lo.col + 3u;
auto s = "";
while (left > 0u) { str::push_char(s, ' '); left -= 1u; }
s += "^";
auto hi = lookup_char_pos(cm, option::get(sp).hi);
if (hi.col != lo.col) {
// the ^ already takes up one space
auto width = hi.col - lo.col - 1u;
while (width > 0u) {
str::push_char(s, '~');
width -= 1u;
}
}
ioivec::stdout().write_str(s + "\n");
}
}
case (_) {}
}
}
fn emit_warning(&option::t[span] sp, &str msg, &codemap cm) {
emit_diagnostic(sp, msg, "warning", 11u8, cm);
}
fn emit_error(&option::t[span] sp, &str msg, &codemap cm) {
emit_diagnostic(sp, msg, "error", 9u8, cm);
}
fn emit_note(&option::t[span] sp, &str msg, &codemap cm) {
emit_diagnostic(sp, msg, "note", 10u8, cm);
}
type file_lines = rec(str name, uint[] lines);
fn span_to_lines(span sp, codemap::codemap cm) -> @file_lines {
auto lo = lookup_char_pos(cm, sp.lo);
auto hi = lookup_char_pos(cm, sp.hi);
auto lines = ~[];
for each (uint i in uint::range(lo.line - 1u, hi.line as uint)) {
lines += ~[i];
}
ret @rec(name=lo.filename, lines=lines);
}
fn get_line(filemap fm, int line, &str file) -> str {
let uint begin = fm.lines.(line).byte - fm.start_pos.byte;
let uint end;
if (line as uint < ivec::len(fm.lines) - 1u) {
end = fm.lines.(line + 1).byte - fm.start_pos.byte;
} else {
// If we're not done parsing the file, we're at the limit of what's
// parsed. If we just slice the rest of the string, we'll print out
// the remainder of the file, which is undesirable.
end = str::byte_len(file);
auto rest = str::slice(file, begin, end);
auto newline = str::index(rest, '\n' as u8);
if (newline != -1) {
end = begin + (newline as uint);
}
}
ret str::slice(file, begin, end);
}
fn get_filemap(codemap cm, str filename) -> filemap {
for (filemap fm in cm.files) {
if (fm.name == filename) {
ret fm;
}
}
//XXjdm the following triggers a mismatched type bug
// (or expected function, found _|_)
fail;// ("asking for " + filename + " which we don't know about");
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
|
