59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
import std._vec;
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/* A codemap is a thing that maps uints to file/line/column positions
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* in a crate. This to make it possible to represent the positions
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* with single-word things, rather than passing records all over the
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* compiler.
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*/
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type filemap = @rec(str name,
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uint start_pos,
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mutable vec[uint] lines);
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type codemap = @rec(mutable vec[filemap] files);
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type loc = rec(str filename, uint line, uint col);
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fn new_codemap() -> codemap {
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let vec[filemap] files = vec();
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ret @rec(mutable files=files);
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}
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fn new_filemap(str filename, uint start_pos) -> filemap {
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ret @rec(name=filename,
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start_pos=start_pos,
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mutable lines=vec(0u));
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}
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fn next_line(filemap file, uint pos) {
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_vec.push[uint](file.lines, pos);
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}
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fn lookup_pos(codemap map, uint pos) -> loc {
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auto a = 0u; auto b = _vec.len[filemap](map.files);
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while (b - a > 1u) {
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auto m = (a + b) / 2u;
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if (map.files.(m).start_pos > pos) { b = m; }
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else { a = m; }
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}
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auto f = map.files.(a);
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a = 0u; b = _vec.len[uint](f.lines);
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while (b - a > 1u) {
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auto m = (a + b) / 2u;
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if (f.lines.(m) > pos) { b = m; }
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else { a = m; }
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}
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ret rec(filename=f.name,
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line=a + 1u,
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col=pos - f.lines.(a));
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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//
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