912 lines
29 KiB
Rust
912 lines
29 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::prelude::*;
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use ast;
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use ast_util;
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use codemap::{BytePos, CharPos, CodeMap, Pos, span};
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use codemap;
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use diagnostic::span_handler;
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use ext::tt::transcribe::{tt_next_token};
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use ext::tt::transcribe::{dup_tt_reader};
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use parse::token;
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use core::char;
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use core::either;
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use core::str;
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use core::u64;
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pub use ext::tt::transcribe::{TtReader, new_tt_reader};
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//use std;
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pub trait reader {
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fn is_eof(@mut self) -> bool;
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fn next_token(@mut self) -> TokenAndSpan;
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fn fatal(@mut self, ~str) -> !;
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fn span_diag(@mut self) -> span_handler;
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pure fn interner(@mut self) -> @token::ident_interner;
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fn peek(@mut self) -> TokenAndSpan;
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fn dup(@mut self) -> reader;
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}
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#[deriving_eq]
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pub struct TokenAndSpan {tok: token::Token, sp: span}
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pub struct StringReader {
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span_diagnostic: span_handler,
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src: @~str,
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// The absolute offset within the codemap of the next character to read
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pos: BytePos,
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// The absolute offset within the codemap of the last character read(curr)
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last_pos: BytePos,
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// The column of the next character to read
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col: CharPos,
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// The last character to be read
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curr: char,
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filemap: @codemap::FileMap,
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interner: @token::ident_interner,
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/* cached: */
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peek_tok: token::Token,
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peek_span: span
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}
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pub fn new_string_reader(span_diagnostic: span_handler,
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filemap: @codemap::FileMap,
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itr: @token::ident_interner)
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-> @mut StringReader {
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let r = new_low_level_string_reader(span_diagnostic, filemap, itr);
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string_advance_token(r); /* fill in peek_* */
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return r;
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}
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/* For comments.rs, which hackily pokes into 'pos' and 'curr' */
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pub fn new_low_level_string_reader(span_diagnostic: span_handler,
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filemap: @codemap::FileMap,
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itr: @token::ident_interner)
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-> @mut StringReader {
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// Force the initial reader bump to start on a fresh line
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let initial_char = '\n';
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let r = @mut StringReader {
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span_diagnostic: span_diagnostic, src: filemap.src,
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pos: filemap.start_pos,
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last_pos: filemap.start_pos,
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col: CharPos(0),
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curr: initial_char,
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filemap: filemap, interner: itr,
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/* dummy values; not read */
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peek_tok: token::EOF,
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peek_span: codemap::dummy_sp()
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};
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bump(r);
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return r;
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}
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// duplicating the string reader is probably a bad idea, in
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// that using them will cause interleaved pushes of line
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// offsets to the underlying filemap...
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fn dup_string_reader(r: @mut StringReader) -> @mut StringReader {
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@mut StringReader {
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span_diagnostic: r.span_diagnostic,
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src: r.src,
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pos: r.pos,
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last_pos: r.last_pos,
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col: r.col,
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curr: r.curr,
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filemap: r.filemap,
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interner: r.interner,
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peek_tok: copy r.peek_tok,
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peek_span: copy r.peek_span
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}
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}
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impl reader for StringReader {
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fn is_eof(@mut self) -> bool { is_eof(self) }
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// return the next token. EFFECT: advances the string_reader.
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fn next_token(@mut self) -> TokenAndSpan {
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let ret_val = TokenAndSpan {
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tok: copy self.peek_tok,
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sp: copy self.peek_span,
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};
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string_advance_token(self);
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ret_val
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}
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fn fatal(@mut self, m: ~str) -> ! {
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self.span_diagnostic.span_fatal(copy self.peek_span, m)
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}
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fn span_diag(@mut self) -> span_handler { self.span_diagnostic }
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pure fn interner(@mut self) -> @token::ident_interner { self.interner }
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fn peek(@mut self) -> TokenAndSpan {
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TokenAndSpan {
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tok: copy self.peek_tok,
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sp: copy self.peek_span,
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}
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}
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fn dup(@mut self) -> reader { dup_string_reader(self) as reader }
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}
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impl reader for TtReader {
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fn is_eof(@mut self) -> bool { self.cur_tok == token::EOF }
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fn next_token(@mut self) -> TokenAndSpan { tt_next_token(self) }
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fn fatal(@mut self, m: ~str) -> ! {
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self.sp_diag.span_fatal(copy self.cur_span, m);
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}
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fn span_diag(@mut self) -> span_handler { self.sp_diag }
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pure fn interner(@mut self) -> @token::ident_interner { self.interner }
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fn peek(@mut self) -> TokenAndSpan {
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TokenAndSpan {
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tok: copy self.cur_tok,
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sp: copy self.cur_span,
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}
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}
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fn dup(@mut self) -> reader { dup_tt_reader(self) as reader }
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}
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// EFFECT: advance peek_tok and peek_span to refer to the next token.
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fn string_advance_token(r: @mut StringReader) {
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match (consume_whitespace_and_comments(r)) {
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Some(comment) => {
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r.peek_tok = copy comment.tok;
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r.peek_span = copy comment.sp;
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},
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None => {
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if is_eof(r) {
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r.peek_tok = token::EOF;
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} else {
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let start_bytepos = r.last_pos;
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r.peek_tok = next_token_inner(r);
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r.peek_span = codemap::mk_sp(start_bytepos, r.last_pos);
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};
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}
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}
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}
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fn byte_offset(rdr: @mut StringReader) -> BytePos {
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(rdr.pos - rdr.filemap.start_pos)
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}
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pub fn get_str_from(rdr: @mut StringReader, start: BytePos) -> ~str {
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unsafe {
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// I'm pretty skeptical about this subtraction. What if there's a
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// multi-byte character before the mark?
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return str::slice(*rdr.src, start.to_uint() - 1u,
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byte_offset(rdr).to_uint() - 1u);
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}
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}
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// EFFECT: advance the StringReader by one character. If a newline is
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// discovered, add it to the FileMap's list of line start offsets.
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pub fn bump(rdr: @mut StringReader) {
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rdr.last_pos = rdr.pos;
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let current_byte_offset = byte_offset(rdr).to_uint();;
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if current_byte_offset < (*rdr.src).len() {
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assert rdr.curr != -1 as char;
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let last_char = rdr.curr;
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let next = str::char_range_at(*rdr.src, current_byte_offset);
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let byte_offset_diff = next.next - current_byte_offset;
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rdr.pos = rdr.pos + BytePos(byte_offset_diff);
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rdr.curr = next.ch;
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rdr.col += CharPos(1u);
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if last_char == '\n' {
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rdr.filemap.next_line(rdr.last_pos);
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rdr.col = CharPos(0u);
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}
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if byte_offset_diff > 1 {
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rdr.filemap.record_multibyte_char(
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BytePos(current_byte_offset), byte_offset_diff);
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}
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} else {
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rdr.curr = -1 as char;
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}
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}
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pub fn is_eof(rdr: @mut StringReader) -> bool {
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rdr.curr == -1 as char
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}
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pub fn nextch(rdr: @mut StringReader) -> char {
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let offset = byte_offset(rdr).to_uint();
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if offset < (*rdr.src).len() {
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return str::char_at(*rdr.src, offset);
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} else { return -1 as char; }
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}
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fn dec_digit_val(c: char) -> int { return (c as int) - ('0' as int); }
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fn hex_digit_val(c: char) -> int {
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if in_range(c, '0', '9') { return (c as int) - ('0' as int); }
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if in_range(c, 'a', 'f') { return (c as int) - ('a' as int) + 10; }
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if in_range(c, 'A', 'F') { return (c as int) - ('A' as int) + 10; }
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fail!();
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}
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fn bin_digit_value(c: char) -> int { if c == '0' { return 0; } return 1; }
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pub fn is_whitespace(c: char) -> bool {
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return c == ' ' || c == '\t' || c == '\r' || c == '\n';
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}
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fn may_begin_ident(c: char) -> bool { return is_alpha(c) || c == '_'; }
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fn in_range(c: char, lo: char, hi: char) -> bool {
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return lo <= c && c <= hi
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}
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fn is_alpha(c: char) -> bool {
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return in_range(c, 'a', 'z') || in_range(c, 'A', 'Z');
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}
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fn is_dec_digit(c: char) -> bool { return in_range(c, '0', '9'); }
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fn is_alnum(c: char) -> bool { return is_alpha(c) || is_dec_digit(c); }
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fn is_hex_digit(c: char) -> bool {
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return in_range(c, '0', '9') || in_range(c, 'a', 'f') ||
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in_range(c, 'A', 'F');
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}
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fn is_bin_digit(c: char) -> bool { return c == '0' || c == '1'; }
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// EFFECT: eats whitespace and comments.
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// returns a Some(sugared-doc-attr) if one exists, None otherwise.
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fn consume_whitespace_and_comments(rdr: @mut StringReader)
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-> Option<TokenAndSpan> {
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while is_whitespace(rdr.curr) { bump(rdr); }
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return consume_any_line_comment(rdr);
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}
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pub pure fn is_line_non_doc_comment(s: &str) -> bool {
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s.trim_right().all(|ch| ch == '/')
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}
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// PRECONDITION: rdr.curr is not whitespace
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// EFFECT: eats any kind of comment.
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// returns a Some(sugared-doc-attr) if one exists, None otherwise
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fn consume_any_line_comment(rdr: @mut StringReader)
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-> Option<TokenAndSpan> {
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if rdr.curr == '/' {
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match nextch(rdr) {
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'/' => {
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bump(rdr);
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bump(rdr);
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// line comments starting with "///" or "//!" are doc-comments
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if rdr.curr == '/' || rdr.curr == '!' {
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let start_bpos = rdr.pos - BytePos(2u);
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let mut acc = ~"//";
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while rdr.curr != '\n' && !is_eof(rdr) {
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str::push_char(&mut acc, rdr.curr);
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bump(rdr);
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}
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// but comments with only "/"s are not
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if !is_line_non_doc_comment(acc) {
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return Some(TokenAndSpan{
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tok: token::DOC_COMMENT(rdr.interner.intern(@acc)),
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sp: codemap::mk_sp(start_bpos, rdr.pos)
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});
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}
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} else {
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while rdr.curr != '\n' && !is_eof(rdr) { bump(rdr); }
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}
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// Restart whitespace munch.
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return consume_whitespace_and_comments(rdr);
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}
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'*' => { bump(rdr); bump(rdr); return consume_block_comment(rdr); }
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_ => ()
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}
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} else if rdr.curr == '#' {
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if nextch(rdr) == '!' {
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let cmap = @CodeMap::new();
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(*cmap).files.push(rdr.filemap);
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let loc = cmap.lookup_char_pos_adj(rdr.last_pos);
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if loc.line == 1u && loc.col == CharPos(0u) {
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while rdr.curr != '\n' && !is_eof(rdr) { bump(rdr); }
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return consume_whitespace_and_comments(rdr);
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}
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}
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}
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return None;
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}
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pub pure fn is_block_non_doc_comment(s: &str) -> bool {
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assert s.len() >= 1u;
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str::all_between(s, 1u, s.len() - 1u, |ch| ch == '*')
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}
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// might return a sugared-doc-attr
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fn consume_block_comment(rdr: @mut StringReader)
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-> Option<TokenAndSpan> {
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// block comments starting with "/**" or "/*!" are doc-comments
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if rdr.curr == '*' || rdr.curr == '!' {
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let start_bpos = rdr.pos - BytePos(2u);
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let mut acc = ~"/*";
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while !(rdr.curr == '*' && nextch(rdr) == '/') && !is_eof(rdr) {
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str::push_char(&mut acc, rdr.curr);
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bump(rdr);
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}
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if is_eof(rdr) {
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rdr.fatal(~"unterminated block doc-comment");
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} else {
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acc += ~"*/";
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bump(rdr);
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bump(rdr);
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// but comments with only "*"s between two "/"s are not
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if !is_block_non_doc_comment(acc) {
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return Some(TokenAndSpan{
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tok: token::DOC_COMMENT(rdr.interner.intern(@acc)),
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sp: codemap::mk_sp(start_bpos, rdr.pos)
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});
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}
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}
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} else {
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loop {
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if is_eof(rdr) { rdr.fatal(~"unterminated block comment"); }
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if rdr.curr == '*' && nextch(rdr) == '/' {
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bump(rdr);
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bump(rdr);
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break;
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} else {
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bump(rdr);
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}
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}
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}
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// restart whitespace munch.
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return consume_whitespace_and_comments(rdr);
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}
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fn scan_exponent(rdr: @mut StringReader) -> Option<~str> {
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let mut c = rdr.curr;
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let mut rslt = ~"";
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if c == 'e' || c == 'E' {
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str::push_char(&mut rslt, c);
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bump(rdr);
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c = rdr.curr;
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if c == '-' || c == '+' {
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str::push_char(&mut rslt, c);
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bump(rdr);
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}
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let exponent = scan_digits(rdr, 10u);
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if str::len(exponent) > 0u {
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return Some(rslt + exponent);
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} else { rdr.fatal(~"scan_exponent: bad fp literal"); }
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} else { return None::<~str>; }
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}
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fn scan_digits(rdr: @mut StringReader, radix: uint) -> ~str {
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let mut rslt = ~"";
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loop {
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let c = rdr.curr;
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if c == '_' { bump(rdr); loop; }
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match char::to_digit(c, radix) {
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Some(_) => {
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str::push_char(&mut rslt, c);
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bump(rdr);
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}
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_ => return rslt
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}
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};
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}
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fn scan_number(c: char, rdr: @mut StringReader) -> token::Token {
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let mut num_str, base = 10u, c = c, n = nextch(rdr);
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if c == '0' && n == 'x' {
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bump(rdr);
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bump(rdr);
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base = 16u;
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} else if c == '0' && n == 'b' {
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bump(rdr);
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bump(rdr);
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base = 2u;
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}
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num_str = scan_digits(rdr, base);
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c = rdr.curr;
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nextch(rdr);
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if c == 'u' || c == 'i' {
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let signed = c == 'i';
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let mut tp = {
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if signed { either::Left(ast::ty_i) }
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else { either::Right(ast::ty_u) }
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};
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bump(rdr);
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c = rdr.curr;
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if c == '8' {
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bump(rdr);
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tp = if signed { either::Left(ast::ty_i8) }
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else { either::Right(ast::ty_u8) };
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}
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n = nextch(rdr);
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if c == '1' && n == '6' {
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bump(rdr);
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bump(rdr);
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tp = if signed { either::Left(ast::ty_i16) }
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else { either::Right(ast::ty_u16) };
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} else if c == '3' && n == '2' {
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bump(rdr);
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bump(rdr);
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tp = if signed { either::Left(ast::ty_i32) }
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else { either::Right(ast::ty_u32) };
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} else if c == '6' && n == '4' {
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bump(rdr);
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bump(rdr);
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tp = if signed { either::Left(ast::ty_i64) }
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else { either::Right(ast::ty_u64) };
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}
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if str::len(num_str) == 0u {
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rdr.fatal(~"no valid digits found for number");
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}
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let parsed = u64::from_str_radix(num_str, base as uint).get();
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match tp {
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either::Left(t) => return token::LIT_INT(parsed as i64, t),
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either::Right(t) => return token::LIT_UINT(parsed, t)
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}
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}
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let mut is_float = false;
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if rdr.curr == '.' && !(is_alpha(nextch(rdr)) || nextch(rdr) == '_' ||
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nextch(rdr) == '.') {
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is_float = true;
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bump(rdr);
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let dec_part = scan_digits(rdr, 10u);
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num_str += ~"." + dec_part;
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}
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if is_float {
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match base {
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16u => rdr.fatal(~"hexadecimal float literal is not supported"),
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2u => rdr.fatal(~"binary float literal is not supported"),
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_ => ()
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}
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}
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match scan_exponent(rdr) {
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Some(ref s) => {
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is_float = true;
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num_str += (*s);
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}
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None => ()
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}
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|
|
let mut is_machine_float = false;
|
|
if rdr.curr == 'f' {
|
|
bump(rdr);
|
|
c = rdr.curr;
|
|
n = nextch(rdr);
|
|
if c == '3' && n == '2' {
|
|
bump(rdr);
|
|
bump(rdr);
|
|
return token::LIT_FLOAT(rdr.interner.intern(@num_str),
|
|
ast::ty_f32);
|
|
} else if c == '6' && n == '4' {
|
|
bump(rdr);
|
|
bump(rdr);
|
|
return token::LIT_FLOAT(rdr.interner.intern(@num_str),
|
|
ast::ty_f64);
|
|
/* FIXME (#2252): if this is out of range for either a
|
|
32-bit or 64-bit float, it won't be noticed till the
|
|
back-end. */
|
|
} else {
|
|
is_float = true;
|
|
is_machine_float = true;
|
|
}
|
|
}
|
|
if is_float {
|
|
if is_machine_float {
|
|
return token::LIT_FLOAT(rdr.interner.intern(@num_str), ast::ty_f);
|
|
}
|
|
return token::LIT_FLOAT_UNSUFFIXED(rdr.interner.intern(@num_str));
|
|
} else {
|
|
if str::len(num_str) == 0u {
|
|
rdr.fatal(~"no valid digits found for number");
|
|
}
|
|
let parsed = u64::from_str_radix(num_str, base as uint).get();
|
|
|
|
debug!("lexing %s as an unsuffixed integer literal",
|
|
num_str);
|
|
return token::LIT_INT_UNSUFFIXED(parsed as i64);
|
|
}
|
|
}
|
|
|
|
fn scan_numeric_escape(rdr: @mut StringReader, n_hex_digits: uint) -> char {
|
|
let mut accum_int = 0, i = n_hex_digits;
|
|
while i != 0u {
|
|
let n = rdr.curr;
|
|
bump(rdr);
|
|
if !is_hex_digit(n) {
|
|
rdr.fatal(fmt!("illegal numeric character escape: %d", n as int));
|
|
}
|
|
accum_int *= 16;
|
|
accum_int += hex_digit_val(n);
|
|
i -= 1u;
|
|
}
|
|
return accum_int as char;
|
|
}
|
|
|
|
fn ident_start(c: char) -> bool {
|
|
(c >= 'a' && c <= 'z')
|
|
|| (c >= 'A' && c <= 'Z')
|
|
|| c == '_'
|
|
|| (c > 'z' && char::is_XID_start(c))
|
|
}
|
|
|
|
fn ident_continue(c: char) -> bool {
|
|
(c >= 'a' && c <= 'z')
|
|
|| (c >= 'A' && c <= 'Z')
|
|
|| (c >= '0' && c <= '9')
|
|
|| c == '_'
|
|
|| (c > 'z' && char::is_XID_continue(c))
|
|
}
|
|
|
|
fn next_token_inner(rdr: @mut StringReader) -> token::Token {
|
|
let mut accum_str = ~"";
|
|
let mut c = rdr.curr;
|
|
if ident_start(c) {
|
|
while ident_continue(c) {
|
|
str::push_char(&mut accum_str, c);
|
|
bump(rdr);
|
|
c = rdr.curr;
|
|
}
|
|
if accum_str == ~"_" { return token::UNDERSCORE; }
|
|
let is_mod_name = c == ':' && nextch(rdr) == ':';
|
|
|
|
// FIXME: perform NFKC normalization here. (Issue #2253)
|
|
return token::IDENT(rdr.interner.intern(@accum_str), is_mod_name);
|
|
}
|
|
if is_dec_digit(c) {
|
|
return scan_number(c, rdr);
|
|
}
|
|
fn binop(rdr: @mut StringReader, op: token::binop) -> token::Token {
|
|
bump(rdr);
|
|
if rdr.curr == '=' {
|
|
bump(rdr);
|
|
return token::BINOPEQ(op);
|
|
} else { return token::BINOP(op); }
|
|
}
|
|
match c {
|
|
|
|
|
|
|
|
|
|
|
|
// One-byte tokens.
|
|
';' => { bump(rdr); return token::SEMI; }
|
|
',' => { bump(rdr); return token::COMMA; }
|
|
'.' => {
|
|
bump(rdr);
|
|
if rdr.curr == '.' && nextch(rdr) != '.' {
|
|
bump(rdr);
|
|
return token::DOTDOT;
|
|
}
|
|
return token::DOT;
|
|
}
|
|
'(' => { bump(rdr); return token::LPAREN; }
|
|
')' => { bump(rdr); return token::RPAREN; }
|
|
'{' => { bump(rdr); return token::LBRACE; }
|
|
'}' => { bump(rdr); return token::RBRACE; }
|
|
'[' => { bump(rdr); return token::LBRACKET; }
|
|
']' => { bump(rdr); return token::RBRACKET; }
|
|
'@' => { bump(rdr); return token::AT; }
|
|
'#' => { bump(rdr); return token::POUND; }
|
|
'~' => { bump(rdr); return token::TILDE; }
|
|
':' => {
|
|
bump(rdr);
|
|
if rdr.curr == ':' {
|
|
bump(rdr);
|
|
return token::MOD_SEP;
|
|
} else { return token::COLON; }
|
|
}
|
|
|
|
'$' => { bump(rdr); return token::DOLLAR; }
|
|
|
|
|
|
|
|
|
|
|
|
// Multi-byte tokens.
|
|
'=' => {
|
|
bump(rdr);
|
|
if rdr.curr == '=' {
|
|
bump(rdr);
|
|
return token::EQEQ;
|
|
} else if rdr.curr == '>' {
|
|
bump(rdr);
|
|
return token::FAT_ARROW;
|
|
} else {
|
|
return token::EQ;
|
|
}
|
|
}
|
|
'!' => {
|
|
bump(rdr);
|
|
if rdr.curr == '=' {
|
|
bump(rdr);
|
|
return token::NE;
|
|
} else { return token::NOT; }
|
|
}
|
|
'<' => {
|
|
bump(rdr);
|
|
match rdr.curr {
|
|
'=' => { bump(rdr); return token::LE; }
|
|
'<' => { return binop(rdr, token::SHL); }
|
|
'-' => {
|
|
bump(rdr);
|
|
match rdr.curr {
|
|
'>' => { bump(rdr); return token::DARROW; }
|
|
_ => { return token::LARROW; }
|
|
}
|
|
}
|
|
_ => { return token::LT; }
|
|
}
|
|
}
|
|
'>' => {
|
|
bump(rdr);
|
|
match rdr.curr {
|
|
'=' => { bump(rdr); return token::GE; }
|
|
'>' => { return binop(rdr, token::SHR); }
|
|
_ => { return token::GT; }
|
|
}
|
|
}
|
|
'\'' => {
|
|
// Either a character constant 'a' OR a lifetime name 'abc
|
|
bump(rdr);
|
|
let mut c2 = rdr.curr;
|
|
bump(rdr);
|
|
|
|
// If the character is an ident start not followed by another single
|
|
// quote, then this is a lifetime name:
|
|
if ident_start(c2) && rdr.curr != '\'' {
|
|
let mut lifetime_name = ~"";
|
|
lifetime_name.push_char(c2);
|
|
while ident_continue(rdr.curr) {
|
|
lifetime_name.push_char(rdr.curr);
|
|
bump(rdr);
|
|
}
|
|
return token::LIFETIME(rdr.interner.intern(@lifetime_name));
|
|
}
|
|
|
|
// Otherwise it is a character constant:
|
|
if c2 == '\\' {
|
|
// '\X' for some X must be a character constant:
|
|
let escaped = rdr.curr;
|
|
bump(rdr);
|
|
match escaped {
|
|
'n' => { c2 = '\n'; }
|
|
'r' => { c2 = '\r'; }
|
|
't' => { c2 = '\t'; }
|
|
'\\' => { c2 = '\\'; }
|
|
'\'' => { c2 = '\''; }
|
|
'"' => { c2 = '"'; }
|
|
'x' => { c2 = scan_numeric_escape(rdr, 2u); }
|
|
'u' => { c2 = scan_numeric_escape(rdr, 4u); }
|
|
'U' => { c2 = scan_numeric_escape(rdr, 8u); }
|
|
c2 => {
|
|
rdr.fatal(fmt!("unknown character escape: %d", c2 as int));
|
|
}
|
|
}
|
|
}
|
|
if rdr.curr != '\'' {
|
|
rdr.fatal(~"unterminated character constant");
|
|
}
|
|
bump(rdr); // advance curr past token
|
|
return token::LIT_INT(c2 as i64, ast::ty_char);
|
|
}
|
|
'"' => {
|
|
let n = byte_offset(rdr);
|
|
bump(rdr);
|
|
while rdr.curr != '"' {
|
|
if is_eof(rdr) {
|
|
rdr.fatal(fmt!("unterminated double quote string: %s",
|
|
get_str_from(rdr, n)));
|
|
}
|
|
|
|
let ch = rdr.curr;
|
|
bump(rdr);
|
|
match ch {
|
|
'\\' => {
|
|
let escaped = rdr.curr;
|
|
bump(rdr);
|
|
match escaped {
|
|
'n' => str::push_char(&mut accum_str, '\n'),
|
|
'r' => str::push_char(&mut accum_str, '\r'),
|
|
't' => str::push_char(&mut accum_str, '\t'),
|
|
'\\' => str::push_char(&mut accum_str, '\\'),
|
|
'\'' => str::push_char(&mut accum_str, '\''),
|
|
'"' => str::push_char(&mut accum_str, '"'),
|
|
'\n' => consume_whitespace(rdr),
|
|
'x' => {
|
|
str::push_char(&mut accum_str,
|
|
scan_numeric_escape(rdr, 2u));
|
|
}
|
|
'u' => {
|
|
str::push_char(&mut accum_str,
|
|
scan_numeric_escape(rdr, 4u));
|
|
}
|
|
'U' => {
|
|
str::push_char(&mut accum_str,
|
|
scan_numeric_escape(rdr, 8u));
|
|
}
|
|
c2 => {
|
|
rdr.fatal(fmt!("unknown string escape: %d", c2 as int));
|
|
}
|
|
}
|
|
}
|
|
_ => str::push_char(&mut accum_str, ch)
|
|
}
|
|
}
|
|
bump(rdr);
|
|
return token::LIT_STR(rdr.interner.intern(@accum_str));
|
|
}
|
|
'-' => {
|
|
if nextch(rdr) == '>' {
|
|
bump(rdr);
|
|
bump(rdr);
|
|
return token::RARROW;
|
|
} else { return binop(rdr, token::MINUS); }
|
|
}
|
|
'&' => {
|
|
if nextch(rdr) == '&' {
|
|
bump(rdr);
|
|
bump(rdr);
|
|
return token::ANDAND;
|
|
} else { return binop(rdr, token::AND); }
|
|
}
|
|
'|' => {
|
|
match nextch(rdr) {
|
|
'|' => { bump(rdr); bump(rdr); return token::OROR; }
|
|
_ => { return binop(rdr, token::OR); }
|
|
}
|
|
}
|
|
'+' => { return binop(rdr, token::PLUS); }
|
|
'*' => { return binop(rdr, token::STAR); }
|
|
'/' => { return binop(rdr, token::SLASH); }
|
|
'^' => { return binop(rdr, token::CARET); }
|
|
'%' => { return binop(rdr, token::PERCENT); }
|
|
c => { rdr.fatal(fmt!("unknown start of token: %d", c as int)); }
|
|
}
|
|
}
|
|
|
|
fn consume_whitespace(rdr: @mut StringReader) {
|
|
while is_whitespace(rdr.curr) && !is_eof(rdr) { bump(rdr); }
|
|
}
|
|
|
|
#[cfg(test)]
|
|
pub mod test {
|
|
use super::*;
|
|
|
|
use ast;
|
|
use codemap::{BytePos, CodeMap, span};
|
|
use core::option::None;
|
|
use diagnostic;
|
|
use parse::token;
|
|
use util::interner;
|
|
use util::testing::{check_equal, check_equal_ptr};
|
|
|
|
// represents a testing reader (incl. both reader and interner)
|
|
struct Env {
|
|
interner: @token::ident_interner,
|
|
string_reader: @mut StringReader
|
|
}
|
|
|
|
// open a string reader for the given string
|
|
fn setup(teststr: ~str) -> Env {
|
|
let cm = CodeMap::new();
|
|
let fm = cm.new_filemap(~"zebra.rs", @teststr);
|
|
let ident_interner = token::mk_ident_interner(); // interner::mk();
|
|
let span_handler =
|
|
diagnostic::mk_span_handler(diagnostic::mk_handler(None),@cm);
|
|
Env {
|
|
interner: ident_interner,
|
|
string_reader: new_string_reader(span_handler,fm,ident_interner)
|
|
}
|
|
}
|
|
|
|
#[test] fn t1 () {
|
|
let Env {interner: ident_interner, string_reader} =
|
|
setup(~"/* my source file */ \
|
|
fn main() { io::println(~\"zebra\"); }\n");
|
|
let id = ident_interner.intern(@~"fn");
|
|
let tok1 = string_reader.next_token();
|
|
let tok2 = TokenAndSpan{
|
|
tok:token::IDENT(id, false),
|
|
sp:span {lo:BytePos(21),hi:BytePos(23),expn_info: None}};
|
|
check_equal (tok1,tok2);
|
|
// the 'main' id is already read:
|
|
check_equal (string_reader.last_pos,BytePos(28));
|
|
// read another token:
|
|
let tok3 = string_reader.next_token();
|
|
let tok4 = TokenAndSpan{
|
|
tok:token::IDENT(ident_interner.intern (@~"main"), false),
|
|
sp:span {lo:BytePos(24),hi:BytePos(28),expn_info: None}};
|
|
check_equal (tok3,tok4);
|
|
// the lparen is already read:
|
|
check_equal (string_reader.last_pos,BytePos(29))
|
|
}
|
|
|
|
// check that the given reader produces the desired stream
|
|
// of tokens (stop checking after exhausting the expected vec)
|
|
fn check_tokenization (env: Env, expected: ~[token::Token]) {
|
|
for expected.each |expected_tok| {
|
|
let TokenAndSpan {tok:actual_tok, sp: _} =
|
|
env.string_reader.next_token();
|
|
check_equal(&actual_tok,expected_tok);
|
|
}
|
|
}
|
|
|
|
// make the identifier by looking up the string in the interner
|
|
fn mk_ident (env: Env, id: ~str, is_mod_name: bool) -> token::Token {
|
|
token::IDENT (env.interner.intern(@id),is_mod_name)
|
|
}
|
|
|
|
#[test] fn doublecolonparsing () {
|
|
let env = setup (~"a b");
|
|
check_tokenization (env,
|
|
~[mk_ident (env,~"a",false),
|
|
mk_ident (env,~"b",false)]);
|
|
}
|
|
|
|
#[test] fn dcparsing_2 () {
|
|
let env = setup (~"a::b");
|
|
check_tokenization (env,
|
|
~[mk_ident (env,~"a",true),
|
|
token::MOD_SEP,
|
|
mk_ident (env,~"b",false)]);
|
|
}
|
|
|
|
#[test] fn dcparsing_3 () {
|
|
let env = setup (~"a ::b");
|
|
check_tokenization (env,
|
|
~[mk_ident (env,~"a",false),
|
|
token::MOD_SEP,
|
|
mk_ident (env,~"b",false)]);
|
|
}
|
|
|
|
#[test] fn dcparsing_4 () {
|
|
let env = setup (~"a:: b");
|
|
check_tokenization (env,
|
|
~[mk_ident (env,~"a",true),
|
|
token::MOD_SEP,
|
|
mk_ident (env,~"b",false)]);
|
|
}
|
|
|
|
#[test] fn character_a() {
|
|
let env = setup(~"'a'");
|
|
let TokenAndSpan {tok, sp: _} =
|
|
env.string_reader.next_token();
|
|
assert tok == token::LIT_INT('a' as i64, ast::ty_char);
|
|
}
|
|
|
|
#[test] fn character_space() {
|
|
let env = setup(~"' '");
|
|
let TokenAndSpan {tok, sp: _} =
|
|
env.string_reader.next_token();
|
|
assert tok == token::LIT_INT(' ' as i64, ast::ty_char);
|
|
}
|
|
|
|
#[test] fn character_escaped() {
|
|
let env = setup(~"'\n'");
|
|
let TokenAndSpan {tok, sp: _} =
|
|
env.string_reader.next_token();
|
|
assert tok == token::LIT_INT('\n' as i64, ast::ty_char);
|
|
}
|
|
|
|
#[test] fn lifetime_name() {
|
|
let env = setup(~"'abc");
|
|
let TokenAndSpan {tok, sp: _} =
|
|
env.string_reader.next_token();
|
|
let id = env.interner.intern(@~"abc");
|
|
assert tok == token::LIFETIME(id);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// End:
|
|
//
|