export filename; export filemap; export span; export file_substr; export codemap; export expn_info; export expn_info_; export expanded_from; export new_filemap; export new_filemap_w_substr; export mk_substr_filename; export lookup_char_pos; export adjust_span; export span_to_str; export span_to_filename; export span_to_lines; export file_lines; export get_line; export next_line; export span_to_snippet; export loc; export get_filemap; export new_codemap; type filename = str; type file_pos = {ch: uint, byte: uint}; /* 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. */ enum file_substr { fss_none, fss_internal(span), fss_external({filename: str, line: uint, col: uint}) } type filemap = @{name: filename, substr: file_substr, src: @str, start_pos: file_pos, mut lines: [file_pos]}; type codemap = @{mut files: [filemap]}; type loc = {file: filemap, line: uint, col: uint}; fn new_codemap() -> codemap { @{mut files: [] } } fn new_filemap_w_substr(filename: filename, substr: file_substr, src: @str, start_pos_ch: uint, start_pos_byte: uint) -> filemap { ret @{name: filename, substr: substr, src: src, start_pos: {ch: start_pos_ch, byte: start_pos_byte}, mut lines: [{ch: start_pos_ch, byte: start_pos_byte}]}; } fn new_filemap(filename: filename, src: @str, start_pos_ch: uint, start_pos_byte: uint) -> filemap { ret new_filemap_w_substr(filename, fss_none, src, start_pos_ch, start_pos_byte); } fn mk_substr_filename(cm: codemap, sp: span) -> str { let pos = lookup_char_pos(cm, sp.lo); ret #fmt("<%s:%u:%u>", pos.file.name, pos.line, pos.col); } fn next_line(file: filemap, chpos: uint, byte_pos: uint) { file.lines += [{ch: chpos, byte: byte_pos + file.start_pos.byte}]; } type lookup_fn = fn@(file_pos) -> uint; fn lookup_line(map: codemap, pos: uint, lookup: lookup_fn) -> {fm: filemap, line: uint} { let len = vec::len(map.files); let mut a = 0u; let mut b = len; while b - a > 1u { let m = (a + b) / 2u; if lookup(map.files[m].start_pos) > pos { b = m; } else { a = m; } } if (a >= len) { fail #fmt("position %u does not resolve to a source location", pos) } let f = map.files[a]; a = 0u; b = vec::len(f.lines); while b - a > 1u { let m = (a + b) / 2u; if lookup(f.lines[m]) > pos { b = m; } else { a = m; } } ret {fm: f, line: a}; } fn lookup_pos(map: codemap, pos: uint, lookup: lookup_fn) -> loc { let {fm: f, line: a} = lookup_line(map, pos, lookup); ret {file: f, line: a + 1u, col: pos - lookup(f.lines[a])}; } fn lookup_char_pos(map: codemap, pos: uint) -> loc { fn lookup(pos: file_pos) -> uint { ret pos.ch; } ret lookup_pos(map, pos, lookup); } fn lookup_byte_pos(map: codemap, pos: uint) -> loc { fn lookup(pos: file_pos) -> uint { ret pos.byte; } ret lookup_pos(map, pos, lookup); } fn lookup_char_pos_adj(map: codemap, pos: uint) -> {filename: str, line: uint, col: uint, file: option} { let loc = lookup_char_pos(map, pos); alt (loc.file.substr) { fss_none { {filename: loc.file.name, line: loc.line, col: loc.col, file: some(loc.file)} } fss_internal(sp) { lookup_char_pos_adj(map, sp.lo + (pos - loc.file.start_pos.ch)) } fss_external(eloc) { {filename: eloc.filename, line: eloc.line + loc.line - 1u, col: if loc.line == 1u {eloc.col + loc.col} else {loc.col}, file: none} } } } fn adjust_span(map: codemap, sp: span) -> span { fn lookup(pos: file_pos) -> uint { ret pos.ch; } let line = lookup_line(map, sp.lo, lookup); alt (line.fm.substr) { fss_none {sp} fss_internal(s) { adjust_span(map, {lo: s.lo + (sp.lo - line.fm.start_pos.ch), hi: s.lo + (sp.hi - line.fm.start_pos.ch), expn_info: sp.expn_info})} fss_external(_) {sp} } } enum expn_info_ { expanded_from({call_site: span, callie: {name: str, span: option}}) } type expn_info = option<@expn_info_>; type span = {lo: uint, hi: uint, expn_info: expn_info}; fn span_to_str_no_adj(sp: span, cm: codemap) -> str { let lo = lookup_char_pos(cm, sp.lo); let hi = lookup_char_pos(cm, sp.hi); ret #fmt("%s:%u:%u: %u:%u", lo.file.name, lo.line, lo.col, hi.line, hi.col) } fn span_to_str(sp: span, cm: codemap) -> str { let lo = lookup_char_pos_adj(cm, sp.lo); let hi = lookup_char_pos_adj(cm, sp.hi); ret #fmt("%s:%u:%u: %u:%u", lo.filename, lo.line, lo.col, hi.line, hi.col) } type file_lines = {file: filemap, lines: [uint]}; fn span_to_filename(sp: span, cm: codemap::codemap) -> filename { let lo = lookup_char_pos(cm, sp.lo); ret lo.file.name; } fn span_to_lines(sp: span, cm: codemap::codemap) -> @file_lines { let lo = lookup_char_pos(cm, sp.lo); let hi = lookup_char_pos(cm, sp.hi); let mut lines = []; uint::range(lo.line - 1u, hi.line as uint) {|i| lines += [i]; }; ret @{file: lo.file, lines: lines}; } fn get_line(fm: filemap, line: int) -> str unsafe { let begin: uint = fm.lines[line].byte - fm.start_pos.byte; let end = alt str::find_char_from(*fm.src, '\n', begin) { some(e) { e } none { str::len(*fm.src) } }; str::slice(*fm.src, begin, end) } fn lookup_byte_offset(cm: codemap::codemap, chpos: uint) -> {fm: filemap, pos: uint} { let {fm, line} = lookup_line(cm, chpos, {|pos| pos.ch}); let line_offset = fm.lines[line].byte - fm.start_pos.byte; let col = chpos - fm.lines[line].ch; let col_offset = str::count_bytes(*fm.src, line_offset, col); {fm: fm, pos: line_offset + col_offset} } fn span_to_snippet(sp: span, cm: codemap::codemap) -> str { let begin = lookup_byte_offset(cm, sp.lo); let end = lookup_byte_offset(cm, sp.hi); assert begin.fm == end.fm; ret str::slice(*begin.fm.src, begin.pos, end.pos); } fn get_snippet(cm: codemap::codemap, fidx: uint, lo: uint, hi: uint) -> str { let fm = cm.files[fidx]; ret str::slice(*fm.src, lo, hi) } fn get_filemap(cm: codemap, filename: str) -> filemap { for cm.files.each {|fm| 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 // End: //