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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 = vec();
ret @rec(mutable files=files);
}
fn new_filemap(str filename, uint start_pos) -> filemap {
let vec[uint] lines = vec();
ret @rec(name=filename,
start_pos=start_pos,
mutable lines=lines);
}
fn next_line(filemap file, uint pos) {
_vec.push[uint](file.lines, pos);
}
fn lookup_pos(codemap map, uint pos) -> loc {
for (filemap f in map.files) {
if (f.start_pos < pos) {
auto line_num = 1u;
auto line_start = 0u;
// FIXME this can be a binary search if we need to be faster
for (uint line_start_ in f.lines) {
// FIXME duplicate code due to lack of working break
if (line_start_ > pos) {
ret rec(filename=f.name,
line=line_num,
col=pos-line_start);
}
line_start = line_start_;
line_num += 1u;
}
ret rec(filename=f.name,
line=line_num,
col=pos-line_start);
}
}
log #fmt("Failed to find a location for character %u", pos);
fail;
}
//
// 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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