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Lexers now emit spans, not chposes.

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This commit is contained in:
Paul Stansifer 2012-06-15 09:32:17 -07:00
parent d6522ab2d3
commit 047e3c45b3
5 changed files with 62 additions and 48 deletions
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2
src/libsyntax/ast.rs
View File

@ -377,7 +377,7 @@ enum blk_sort {
enum token_tree {
/* for macro invocations; parsing is the macro's job */
tt_delim([token_tree]),
tt_flat(uint, token::token)
tt_flat(span, token::token)
}
#[auto_serialize]

22
src/libsyntax/parse/comments.rs
View File

@ -1,7 +1,7 @@
import io::reader_util;
import io::println;//XXXXXXXXxxx
import util::interner;
import lexer::{ string_reader, bump, is_eof, nextch, new_string_reader,
import lexer::{ string_reader, bump, is_eof, nextch,
is_whitespace, get_str_from, string_reader_as_reader };
export cmnt;
@ -176,8 +176,9 @@ fn gather_comments_and_literals(span_diagnostic: diagnostic::span_handler,
{|x|str::hash(*x)},
{|x,y|str::eq(*x, *y)}
);
let rdr = new_string_reader(span_diagnostic,
codemap::new_filemap(path, src, 0u, 0u), itr);
let rdr = lexer::new_low_level_string_reader
(span_diagnostic, codemap::new_filemap(path, src, 0u, 0u), itr);
let mut comments: [cmnt] = [];
let mut literals: [lit] = [];
let mut first_read: bool = true;
@ -195,14 +196,17 @@ fn gather_comments_and_literals(span_diagnostic: diagnostic::span_handler,
}
break;
}
let bpos = rdr.pos;
let tok = rdr.next_token();
if token::is_lit(tok.tok) {
let s = get_str_from(rdr, bpos);
literals += [{lit: s, pos: tok.chpos}];
let bstart = rdr.pos;
//discard, and look ahead; we're working with internal state
let {tok: tok, sp: sp} = rdr.next_token();
if token::is_lit(tok) {
let s = get_str_from(rdr, bstart);
literals += [{lit: s, pos: sp.lo}];
log(debug, "tok lit: " + s);
} else {
log(debug, "tok: " + token::to_str(*rdr.interner, tok.tok));
log(debug, "tok: " + token::to_str(*rdr.interner, tok));
}
first_read = false;
}

4
src/libsyntax/parse/eval.rs
View File

@ -68,7 +68,7 @@ fn parse_companion_mod(cx: ctx, prefix: str, suffix: option<str>)
modpath, SOURCE_FILE);
let inner_attrs = p0.parse_inner_attrs_and_next();
let m0 = p0.parse_mod_items(token::EOF, inner_attrs.next);
cx.sess.chpos = p0.reader.chpos();
cx.sess.chpos = r0.chpos;
cx.sess.byte_pos = cx.sess.byte_pos + r0.pos;
ret (m0.view_items, m0.items, inner_attrs.inner);
} else {
@ -106,7 +106,7 @@ fn eval_crate_directive(cx: ctx, cdir: @ast::crate_directive, prefix: str,
/* FIXME: bad */ copy id,
ast::item_mod(m0), ast::public, mod_attrs);
// Thread defids, chpos and byte_pos through the parsers
cx.sess.chpos = p0.reader.chpos();
cx.sess.chpos = r0.chpos;
cx.sess.byte_pos = cx.sess.byte_pos + r0.pos;
items += [i];
}

51
src/libsyntax/parse/lexer.rs
View File

@ -2,17 +2,17 @@ import util::interner;
import util::interner::intern;
import diagnostic;
import ast::{tt_delim,tt_flat};
import codemap::span;
export reader, string_reader, new_string_reader, is_whitespace;
export tt_reader, new_tt_reader, dup_tt_reader;
export nextch, is_eof, bump, get_str_from;
export nextch, is_eof, bump, get_str_from, new_low_level_string_reader;
export string_reader_as_reader, tt_reader_as_reader;
iface reader {
fn is_eof() -> bool;
fn next_token() -> {tok: token::token, chpos: uint};
fn next_token() -> {tok: token::token, sp: span};
fn fatal(str) -> !;
fn chpos() -> uint;
fn interner() -> @interner::interner<@str>;
}
@ -33,7 +33,7 @@ type tt_reader = ~{
mut cur: tt_frame,
/* cached: */
mut cur_tok: token::token,
mut cur_chpos: uint
mut cur_span: span
};
fn new_tt_reader(span_diagnostic: diagnostic::span_handler,
@ -42,10 +42,11 @@ fn new_tt_reader(span_diagnostic: diagnostic::span_handler,
let r = ~{span_diagnostic: span_diagnostic, interner: itr,
mut cur: @{readme: src, mut idx: 0u,
up: tt_frame_up(option::none)},
mut cur_tok: token::EOF, /* dummy value, never read */
mut cur_chpos: 0u /* dummy value, never read */
/* dummy values, never read: */
mut cur_tok: token::EOF,
mut cur_span: ast_util::mk_sp(0u,0u)
};
tt_next_token(r); /* get cur_tok and cur_chpos set up */
tt_next_token(r); /* get cur_tok and cur_span set up */
ret r;
}
@ -63,7 +64,7 @@ pure fn dup_tt_frame(&&f: tt_frame) -> tt_frame {
pure fn dup_tt_reader(&&r: tt_reader) -> tt_reader {
~{span_diagnostic: r.span_diagnostic, interner: r.interner,
mut cur: dup_tt_frame(r.cur),
mut cur_tok: r.cur_tok, mut cur_chpos: r.cur_chpos}
mut cur_tok: r.cur_tok, mut cur_span: r.cur_span}
}
type string_reader = @{
@ -80,6 +81,15 @@ type string_reader = @{
fn new_string_reader(span_diagnostic: diagnostic::span_handler,
filemap: codemap::filemap,
itr: @interner::interner<@str>) -> string_reader {
let r = new_low_level_string_reader(span_diagnostic, filemap, itr);
ret r;
}
/* For comments.rs, which hackily pokes into 'pos' and 'curr' */
fn new_low_level_string_reader(span_diagnostic: diagnostic::span_handler,
filemap: codemap::filemap,
itr: @interner::interner<@str>)
-> string_reader {
let r = @{span_diagnostic: span_diagnostic, src: filemap.src,
mut col: 0u, mut pos: 0u, mut curr: -1 as char,
mut chpos: filemap.start_pos.ch,
@ -94,7 +104,7 @@ fn new_string_reader(span_diagnostic: diagnostic::span_handler,
impl string_reader_as_reader of reader for string_reader {
fn is_eof() -> bool { is_eof(self) }
fn next_token() -> {tok: token::token, chpos: uint} {
fn next_token() -> {tok: token::token, sp: span} {
consume_whitespace_and_comments(self);
let start_chpos = self.chpos;
let tok = if is_eof(self) {
@ -102,19 +112,18 @@ impl string_reader_as_reader of reader for string_reader {
} else {
next_token_inner(self)
};
ret {tok: tok, chpos: start_chpos};
ret {tok: tok, sp: ast_util::mk_sp(start_chpos, self.chpos)};
}
fn fatal(m: str) -> ! {
self.span_diagnostic.span_fatal(
ast_util::mk_sp(self.chpos, self.chpos), m)
}
fn chpos() -> uint { self.chpos }
fn interner() -> @interner::interner<@str> { self.interner }
}
impl tt_reader_as_reader of reader for tt_reader {
fn is_eof() -> bool { self.cur_tok == token::EOF }
fn next_token() -> {tok: token::token, chpos: uint} {
fn next_token() -> {tok: token::token, sp: span} {
/* weird resolve bug: if the following `if`, or any of its
statements are removed, we get resolution errors */
if false {
@ -124,15 +133,19 @@ impl tt_reader_as_reader of reader for tt_reader {
tt_next_token(self)
}
fn fatal(m: str) -> ! {
self.span_diagnostic.span_fatal(
ast_util::mk_sp(self.chpos(), self.chpos()), m);
self.span_diagnostic.span_fatal(copy self.cur_span, m);
}
fn chpos() -> uint { self.cur_chpos }
fn interner() -> @interner::interner<@str> { self.interner }
}
fn tt_next_token(&&r: tt_reader) -> {tok: token::token, chpos: uint} {
let ret_val = { tok: r.cur_tok, chpos: r.cur_chpos };
fn string_advance_token(&&r: string_reader) {
consume_whitespace_and_comments(r);
next_token_inner(r);
}
fn tt_next_token(&&r: tt_reader) -> {tok: token::token, sp: span} {
let ret_val = { tok: r.cur_tok, sp: r.cur_span };
if r.cur.idx >= vec::len(r.cur.readme) {
/* done with this set; pop */
alt r.cur.up {
@ -158,8 +171,8 @@ fn tt_next_token(&&r: tt_reader) -> {tok: token::token, chpos: uint} {
r.cur = @{readme: tts, mut idx: 0u,
up: tt_frame_up(option::some(copy r.cur)) };
}
tt_flat(chpos, tok) {
r.cur_chpos = chpos; r.cur_tok = tok;
tt_flat(sp, tok) {
r.cur_span = sp; r.cur_tok = tok;
r.cur.idx += 1u;
ret ret_val;
}

31
src/libsyntax/parse/parser.rs
View File

@ -63,7 +63,7 @@ class parser {
let mut token: token::token;
let mut span: span;
let mut last_span: span;
let mut buffer: [mut {tok: token::token, span: span}]/4;
let mut buffer: [mut {tok: token::token, sp: span}]/4;
let mut buffer_start: int;
let mut buffer_end: int;
let mut restriction: restriction;
@ -75,7 +75,7 @@ class parser {
{
self.reader <- rdr;
let tok0 = self.reader.next_token();
let span0 = ast_util::mk_sp(tok0.chpos, self.reader.chpos());
let span0 = tok0.sp;
self.sess = sess;
self.cfg = cfg;
self.file_type = ftype;
@ -83,10 +83,10 @@ class parser {
self.span = span0;
self.last_span = span0;
self.buffer = [mut
{tok: tok0.tok, span: span0},
{tok: tok0.tok, span: span0},
{tok: tok0.tok, span: span0},
{tok: tok0.tok, span: span0}
{tok: tok0.tok, sp: span0},
{tok: tok0.tok, sp: span0},
{tok: tok0.tok, sp: span0},
{tok: tok0.tok, sp: span0}
]/4;
self.buffer_start = 0;
self.buffer_end = 0;
@ -100,16 +100,15 @@ class parser {
fn bump() {
self.last_span = self.span;
if self.buffer_start == self.buffer_end {
let next = self.reader.next_token();
self.token = next.tok;
self.span = mk_sp(next.chpos, self.reader.chpos());
let next = if self.buffer_start == self.buffer_end {
self.reader.next_token()
} else {
let next = self.buffer[self.buffer_start];
self.buffer_start = (self.buffer_start + 1) & 3;
self.token = next.tok;
self.span = next.span;
}
next
};
self.token = next.tok;
self.span = next.sp;
}
fn swap(next: token::token, lo: uint, hi: uint) {
self.token = next;
@ -124,9 +123,7 @@ class parser {
fn look_ahead(distance: uint) -> token::token {
let dist = distance as int;
while self.buffer_length() < dist {
let next = self.reader.next_token();
let sp = mk_sp(next.chpos, self.reader.chpos());
self.buffer[self.buffer_end] = {tok: next.tok, span: sp};
self.buffer[self.buffer_end] = self.reader.next_token();
self.buffer_end = (self.buffer_end + 1) & 3;
}
ret copy self.buffer[(self.buffer_start + dist - 1) & 3].tok;
@ -1082,7 +1079,7 @@ class parser {
}
_ { /* ok */ }
}
let res = tt_flat(p.span.lo, p.token);
let res = tt_flat(p.span, p.token);
p.bump();
ret res;
}