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import std::vec;
/* 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(str name, uint start_pos, mutable vec[uint] lines);
type codemap = @rec(mutable vec[filemap] files);
type loc = rec(str filename, uint line, uint col);
fn new_codemap() -> codemap {
let vec[filemap] files = [];
ret @rec(mutable files=files);
}
fn new_filemap(str filename, uint start_pos) -> filemap {
ret @rec(name=filename, start_pos=start_pos, mutable lines=[0u]);
}
fn next_line(filemap file, uint pos) { vec::push[uint](file.lines, pos); }
fn lookup_pos(codemap map, uint pos) -> loc {
auto a = 0u;
auto b = vec::len[filemap](map.files);
while (b - a > 1u) {
auto m = (a + b) / 2u;
if (map.files.(m).start_pos > pos) { b = m; } else { a = m; }
}
auto f = map.files.(a);
a = 0u;
b = vec::len[uint](f.lines);
while (b - a > 1u) {
auto m = (a + b) / 2u;
if (f.lines.(m) > pos) { b = m; } else { a = m; }
}
ret rec(filename=f.name, line=a + 1u, col=pos - f.lines.(a));
}
//
// 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:
//
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