Rename librustsyntax to libsyntax

Per issue #2418.

src/libsyntax/codemap.rs

@@ -0,0 +1,236 @@
+import dvec::{dvec, extensions};
+
+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 lookup_char_pos_adj;
+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 = @{files: dvec<filemap>};
+
+type loc = {file: filemap, line: uint, col: uint};
+
+fn new_codemap() -> codemap { @{files: dvec()} }
+
+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 = map.files.len();
+    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<filemap>}
+{
+    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<span>}})
+}
+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 = [];
+    for 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:
+//