rust/src/libsyntax/codemap.rs

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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.
*/
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use dvec::DVec;
use std::serialization::{Serializable,
Deserializable,
Serializer,
Deserializer};
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trait Pos {
static pure fn from_uint(n: uint) -> self;
pure fn to_uint(&self) -> uint;
}
pub enum BytePos = uint;
pub enum CharPos = uint;
impl BytePos: Pos {
static pure fn from_uint(n: uint) -> BytePos { BytePos(n) }
pure fn to_uint(&self) -> uint { **self }
}
impl BytePos: cmp::Eq {
pure fn eq(other: &BytePos) -> bool {
*self == **other
}
pure fn ne(other: &BytePos) -> bool { !self.eq(other) }
}
impl BytePos: cmp::Ord {
pure fn lt(other: &BytePos) -> bool { *self < **other }
pure fn le(other: &BytePos) -> bool { *self <= **other }
pure fn ge(other: &BytePos) -> bool { *self >= **other }
pure fn gt(other: &BytePos) -> bool { *self > **other }
}
impl BytePos: Num {
pure fn add(other: &BytePos) -> BytePos {
BytePos(*self + **other)
}
pure fn sub(other: &BytePos) -> BytePos {
BytePos(*self - **other)
}
pure fn mul(other: &BytePos) -> BytePos {
BytePos(*self * (**other))
}
pure fn div(other: &BytePos) -> BytePos {
BytePos(*self / **other)
}
pure fn modulo(other: &BytePos) -> BytePos {
BytePos(*self % **other)
}
pure fn neg() -> BytePos {
BytePos(-*self)
}
pure fn to_int() -> int { *self as int }
static pure fn from_int(+n: int) -> BytePos { BytePos(n as uint) }
}
impl BytePos: to_bytes::IterBytes {
pure fn iter_bytes(+lsb0: bool, f: to_bytes::Cb) {
(*self).iter_bytes(lsb0, f)
}
}
impl CharPos: Pos {
static pure fn from_uint(n: uint) -> CharPos { CharPos(n) }
pure fn to_uint(&self) -> uint { **self }
}
impl CharPos: cmp::Eq {
pure fn eq(other: &CharPos) -> bool {
*self == **other
}
pure fn ne(other: &CharPos) -> bool { !self.eq(other) }
}
impl CharPos: cmp::Ord {
pure fn lt(other: &CharPos) -> bool { *self < **other }
pure fn le(other: &CharPos) -> bool { *self <= **other }
pure fn ge(other: &CharPos) -> bool { *self >= **other }
pure fn gt(other: &CharPos) -> bool { *self > **other }
}
impl CharPos: Num {
pure fn add(other: &CharPos) -> CharPos {
CharPos(*self + **other)
}
pure fn sub(other: &CharPos) -> CharPos {
CharPos(*self - **other)
}
pure fn mul(other: &CharPos) -> CharPos {
CharPos(*self * (**other))
}
pure fn div(other: &CharPos) -> CharPos {
CharPos(*self / **other)
}
pure fn modulo(other: &CharPos) -> CharPos {
CharPos(*self % **other)
}
pure fn neg() -> CharPos {
CharPos(-*self)
}
pure fn to_int() -> int { *self as int }
static pure fn from_int(+n: int) -> CharPos { CharPos(n as uint) }
}
impl CharPos: to_bytes::IterBytes {
pure fn iter_bytes(+lsb0: bool, f: to_bytes::Cb) {
(*self).iter_bytes(lsb0, f)
}
}
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pub struct span {
lo: CharPos,
hi: CharPos,
expn_info: Option<@ExpnInfo>
}
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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) }
}
impl<S: Serializer> span: Serializable<S> {
/* Note #1972 -- spans are serialized but not deserialized */
fn serialize(&self, _s: &S) { }
}
impl<D: Deserializer> span: Deserializable<D> {
static fn deserialize(_d: &D) -> span {
ast_util::dummy_sp()
}
}
pub struct Loc<A: Pos> {
file: @FileMap, line: uint, col: A
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}
pub struct FilePos {
ch: CharPos, byte: BytePos
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}
impl FilePos : cmp::Eq {
pure fn eq(other: &FilePos) -> bool {
self.ch == (*other).ch && self.byte == (*other).byte
}
pure fn ne(other: &FilePos) -> bool { !self.eq(other) }
}
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pub enum ExpnInfo {
ExpandedFrom({call_site: span,
callie: {name: ~str, span: Option<span>}})
}
pub type FileName = ~str;
pub type LookupFn = pure fn(FilePos) -> uint;
pub struct FileLines {
file: @FileMap,
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lines: ~[uint]
}
pub enum FileSubstr {
pub FssNone,
pub FssInternal(span),
pub FssExternal({filename: ~str, line: uint, col: CharPos})
}
pub struct FileMap {
name: FileName,
substr: FileSubstr,
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src: @~str,
start_pos: FilePos,
mut lines: ~[FilePos]
}
pub impl FileMap {
static fn new_w_substr(+filename: FileName, +substr: FileSubstr,
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src: @~str,
+start_pos: FilePos)
-> FileMap {
return FileMap {
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name: filename, substr: substr, src: src,
start_pos: start_pos,
mut lines: ~[]
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};
}
static fn new(+filename: FileName, src: @~str,
+start_pos: FilePos)
-> FileMap {
return FileMap::new_w_substr(filename, FssNone, src,
start_pos);
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}
fn next_line(@self, +pos: FilePos) {
self.lines.push(pos);
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}
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pub fn get_line(@self, line: int) -> ~str unsafe {
let begin: BytePos = self.lines[line].byte - self.start_pos.byte;
let begin = begin.to_uint();
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let end = match str::find_char_from(*self.src, '\n', begin) {
Some(e) => e,
None => str::len(*self.src)
};
str::slice(*self.src, begin, end)
}
}
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pub struct CodeMap {
files: DVec<@FileMap>
}
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pub impl CodeMap {
static pub fn new() -> CodeMap {
CodeMap {
files: DVec()
}
}
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pub fn add_filemap(@self, filemap: @FileMap) {
let expected_byte_pos = if self.files.len() == 0 {
0
} else {
let last_start = self.files.last().start_pos.byte.to_uint();
let last_len = self.files.last().src.len();
last_start + last_len
};
let actual_byte_pos = filemap.start_pos.byte.to_uint();
debug!("codemap: adding filemap: %s", filemap.name);
debug!("codemap: expected offset: %u", expected_byte_pos);
debug!("codemap: actual offset: %u", actual_byte_pos);
assert expected_byte_pos == actual_byte_pos;
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self.files.push(filemap);
}
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pub fn mk_substr_filename(@self, sp: span) -> ~str {
let pos = self.lookup_char_pos(sp.lo);
return fmt!("<%s:%u:%u>", pos.file.name,
pos.line, pos.col.to_uint());
}
pub fn lookup_char_pos(@self, +pos: CharPos) -> Loc<CharPos> {
pure fn lookup(pos: FilePos) -> uint { return pos.ch.to_uint(); }
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return self.lookup_pos(pos, lookup);
}
pub fn lookup_byte_pos(@self, +pos: BytePos) -> Loc<BytePos> {
pure fn lookup(pos: FilePos) -> uint { return pos.byte.to_uint(); }
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return self.lookup_pos(pos, lookup);
}
pub fn lookup_char_pos_adj(@self, +pos: CharPos)
-> {filename: ~str, line: uint, col: CharPos, file: Option<@FileMap>}
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{
let loc = self.lookup_char_pos(pos);
match (loc.file.substr) {
FssNone => {
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{filename: /* FIXME (#2543) */ copy loc.file.name,
line: loc.line,
col: loc.col,
file: Some(loc.file)}
}
FssInternal(sp) => {
self.lookup_char_pos_adj(
sp.lo + (pos - loc.file.start_pos.ch))
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}
FssExternal(eloc) => {
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{filename: /* FIXME (#2543) */ copy eloc.filename,
line: eloc.line + loc.line - 1u,
col: if loc.line == 1u {eloc.col + loc.col} else {loc.col},
file: None}
}
}
}
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pub fn adjust_span(@self, sp: span) -> span {
pure fn lookup(pos: FilePos) -> uint { return pos.ch.to_uint(); }
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let line = self.lookup_line(sp.lo, lookup);
match (line.fm.substr) {
FssNone => sp,
FssInternal(s) => {
self.adjust_span(span {
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
})
}
FssExternal(_) => sp
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}
}
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pub fn span_to_str(@self, sp: span) -> ~str {
let lo = self.lookup_char_pos_adj(sp.lo);
let hi = self.lookup_char_pos_adj(sp.hi);
return fmt!("%s:%u:%u: %u:%u", lo.filename,
lo.line, lo.col.to_uint(), hi.line, hi.col.to_uint())
}
pub fn span_to_filename(@self, sp: span) -> FileName {
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let lo = self.lookup_char_pos(sp.lo);
return /* FIXME (#2543) */ copy lo.file.name;
}
pub fn span_to_lines(@self, sp: span) -> @FileLines {
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let lo = self.lookup_char_pos(sp.lo);
let hi = self.lookup_char_pos(sp.hi);
let mut lines = ~[];
for uint::range(lo.line - 1u, hi.line as uint) |i| {
lines.push(i);
};
return @FileLines {file: lo.file, lines: lines};
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}
fn lookup_byte_offset(@self, +chpos: CharPos)
-> {fm: @FileMap, pos: BytePos} {
pure fn lookup(pos: FilePos) -> uint { return pos.ch.to_uint(); }
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let {fm, line} = self.lookup_line(chpos, lookup);
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.to_uint(),
col.to_uint());
{fm: fm, pos: line_offset + BytePos(col_offset)}
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}
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pub fn span_to_snippet(@self, sp: span) -> ~str {
let begin = self.lookup_byte_offset(sp.lo);
let end = self.lookup_byte_offset(sp.hi);
assert begin.fm.start_pos == end.fm.start_pos;
return str::slice(*begin.fm.src,
begin.pos.to_uint(), end.pos.to_uint());
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}
pub fn get_filemap(@self, filename: ~str) -> @FileMap {
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for self.files.each |fm| { if fm.name == filename { return *fm; } }
//XXjdm the following triggers a mismatched type bug
// (or expected function, found _|_)
fail; // ("asking for " + filename + " which we don't know about");
}
}
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priv impl CodeMap {
fn lookup_line<A: Pos>(@self, pos: A, lookup: LookupFn)
-> {fm: @FileMap, line: uint}
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{
let len = self.files.len();
let mut a = 0u;
let mut b = len;
while b - a > 1u {
let m = (a + b) / 2u;
if lookup(self.files[m].start_pos) > pos.to_uint() {
b = m;
} else {
a = m;
}
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}
if (a >= len) {
fail fmt!("position %u does not resolve to a source location",
pos.to_uint())
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}
let f = self.files[a];
a = 0u;
b = vec::len(f.lines);
while b - a > 1u {
let m = (a + b) / 2u;
if lookup(f.lines[m]) > pos.to_uint() { b = m; } else { a = m; }
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}
return {fm: f, line: a};
}
fn lookup_pos<A: Pos Num>(@self, pos: A, lookup: LookupFn) -> Loc<A> {
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let {fm: f, line: a} = self.lookup_line(pos, lookup);
return Loc {
file: f,
line: a + 1u,
col: pos - from_uint(lookup(f.lines[a]))
};
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}
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fn span_to_str_no_adj(@self, sp: span) -> ~str {
let lo = self.lookup_char_pos(sp.lo);
let hi = self.lookup_char_pos(sp.hi);
return fmt!("%s:%u:%u: %u:%u", lo.file.name,
lo.line, lo.col.to_uint(), hi.line, hi.col.to_uint())
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}
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
//