rust/src/libsyntax/codemap.rs

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use dvec::DVec;
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export filename;
export filemap;
export span;
export file_substr;
export fss_none;
export fss_internal;
export fss_external;
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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;
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export adjust_span;
export span_to_str;
export span_to_filename;
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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;
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type file_pos = {ch: uint, byte: uint};
impl file_pos : cmp::Eq {
pure fn eq(other: &file_pos) -> bool {
self.ch == (*other).ch && self.byte == (*other).byte
}
pure fn ne(other: &file_pos) -> bool { !self.eq(other) }
}
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/* 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})
}
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type filemap =
@{name: filename, substr: file_substr, src: @~str,
start_pos: file_pos, mut lines: ~[file_pos]};
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type codemap = @{files: DVec<filemap>};
type loc = {file: filemap, line: uint, col: uint};
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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)
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-> filemap {
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return @{name: filename, substr: substr, src: src,
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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 {
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return 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);
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return fmt!("<%s:%u:%u>", pos.file.name, pos.line, pos.col);
}
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fn next_line(file: filemap, chpos: uint, byte_pos: uint) {
file.lines.push({ch: chpos, byte: byte_pos + file.start_pos.byte});
}
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type lookup_fn = pure fn(file_pos) -> uint;
fn lookup_line(map: codemap, pos: uint, lookup: lookup_fn)
-> {fm: filemap, line: uint}
{
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let len = map.files.len();
let mut a = 0u;
let mut b = len;
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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) {
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fail fmt!("position %u does not resolve to a source location", pos)
}
let f = map.files[a];
a = 0u;
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b = vec::len(f.lines);
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while b - a > 1u {
let m = (a + b) / 2u;
if lookup(f.lines[m]) > pos { b = m; } else { a = m; }
}
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return {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);
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return {file: f, line: a + 1u, col: pos - lookup(f.lines[a])};
}
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fn lookup_char_pos(map: codemap, pos: uint) -> loc {
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pure fn lookup(pos: file_pos) -> uint { return pos.ch; }
return lookup_pos(map, pos, lookup);
}
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fn lookup_byte_pos(map: codemap, pos: uint) -> loc {
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pure fn lookup(pos: file_pos) -> uint { return pos.byte; }
return lookup_pos(map, pos, lookup);
}
fn lookup_char_pos_adj(map: codemap, pos: uint)
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-> {filename: ~str, line: uint, col: uint, file: Option<filemap>}
{
let loc = lookup_char_pos(map, pos);
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match (loc.file.substr) {
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fss_none => {
{filename: /* FIXME (#2543) */ copy loc.file.name,
line: loc.line,
col: loc.col,
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file: Some(loc.file)}
}
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fss_internal(sp) => {
lookup_char_pos_adj(map, sp.lo + (pos - loc.file.start_pos.ch))
}
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fss_external(eloc) => {
{filename: /* FIXME (#2543) */ copy eloc.filename,
line: eloc.line + loc.line - 1u,
col: if loc.line == 1u {eloc.col + loc.col} else {loc.col},
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file: None}
}
}
}
fn adjust_span(map: codemap, sp: span) -> span {
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pure fn lookup(pos: file_pos) -> uint { return pos.ch; }
let line = lookup_line(map, sp.lo, lookup);
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match (line.fm.substr) {
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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})}
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fss_external(_) => sp
}
}
enum expn_info_ {
expanded_from({call_site: span,
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callie: {name: ~str, span: Option<span>}})
}
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type expn_info = Option<@expn_info_>;
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type span = {lo: uint, hi: uint, expn_info: expn_info};
impl span : cmp::Eq {
pure fn eq(other: &span) -> bool {
return self.lo == (*other).lo && self.hi == (*other).hi;
}
pure fn ne(other: &span) -> bool { !self.eq(other) }
}
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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);
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return 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);
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return 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);
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return /* FIXME (#2543) */ copy lo.file.name;
}
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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 = ~[];
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for uint::range(lo.line - 1u, hi.line as uint) |i| {
lines.push(i);
};
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return @{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;
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let end = match str::find_char_from(*fm.src, '\n', begin) {
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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} {
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pure fn lookup(pos: file_pos) -> uint { return pos.ch; }
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let {fm, line} = lookup_line(cm, chpos, lookup);
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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);
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assert begin.fm.start_pos == end.fm.start_pos;
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return 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];
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return str::slice(*fm.src, lo, hi)
}
fn get_filemap(cm: codemap, filename: ~str) -> filemap {
for cm.files.each |fm| { if fm.name == filename { return *fm; } }
//XXjdm the following triggers a mismatched type bug
// (or expected function, found _|_)
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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:
//