711 lines
21 KiB
Rust
711 lines
21 KiB
Rust
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import core::{vec, str, option, either};
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import std::io;
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import io::reader_util;
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import option::{some, none};
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import util::interner;
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import util::interner::intern;
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import codemap;
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import driver::diagnostic;
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type reader = @{
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cm: codemap::codemap,
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span_diagnostic: diagnostic::span_handler,
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src: @str,
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len: uint,
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mutable col: uint,
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mutable pos: uint,
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mutable curr: char,
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mutable chpos: uint,
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mutable strs: [str],
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filemap: codemap::filemap,
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interner: @interner::interner<str>
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};
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impl reader for reader {
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fn is_eof() -> bool { self.curr == -1 as char }
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fn get_str_from(start: uint) -> str {
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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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ret str::slice(*self.src, start - 1u, self.pos - 1u);
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}
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fn next() -> char {
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if self.pos < self.len {
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ret str::char_at(*self.src, self.pos);
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} else { ret -1 as char; }
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}
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fn bump() {
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if self.pos < self.len {
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self.col += 1u;
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self.chpos += 1u;
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if self.curr == '\n' {
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codemap::next_line(self.filemap, self.chpos, self.pos +
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self.filemap.start_pos.byte);
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self.col = 0u;
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}
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let next = str::char_range_at(*self.src, self.pos);
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self.pos = next.next;
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self.curr = next.ch;
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} else { self.curr = -1 as char; }
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}
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fn fatal(m: str) -> ! {
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self.span_diagnostic.span_fatal(
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ast_util::mk_sp(self.chpos, self.chpos),
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m)
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}
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}
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fn new_reader(cm: codemap::codemap,
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span_diagnostic: diagnostic::span_handler,
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filemap: codemap::filemap,
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itr: @interner::interner<str>) -> reader {
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let r = @{cm: cm,
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span_diagnostic: span_diagnostic,
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src: filemap.src, len: str::byte_len(*filemap.src),
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mutable col: 0u, mutable pos: 0u, mutable curr: -1 as char,
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mutable chpos: filemap.start_pos.ch, mutable strs: [],
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filemap: filemap, interner: itr};
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if r.pos < r.len {
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let next = str::char_range_at(*r.src, r.pos);
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r.pos = next.next;
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r.curr = next.ch;
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}
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ret r;
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}
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fn dec_digit_val(c: char) -> int { ret (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') { ret (c as int) - ('0' as int); }
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if in_range(c, 'a', 'f') { ret (c as int) - ('a' as int) + 10; }
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if in_range(c, 'A', 'F') { ret (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' { ret 0; } ret 1; }
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fn is_whitespace(c: char) -> bool {
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ret c == ' ' || c == '\t' || c == '\r' || c == '\n';
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}
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fn may_begin_ident(c: char) -> bool { ret is_alpha(c) || c == '_'; }
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fn in_range(c: char, lo: char, hi: char) -> bool { ret lo <= c && c <= hi; }
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fn is_alpha(c: char) -> bool {
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ret 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 { ret in_range(c, '0', '9'); }
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fn is_alnum(c: char) -> bool { ret is_alpha(c) || is_dec_digit(c); }
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fn is_hex_digit(c: char) -> bool {
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ret 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 { ret c == '0' || c == '1'; }
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fn consume_whitespace_and_comments(rdr: reader) {
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while is_whitespace(rdr.curr) { rdr.bump(); }
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be consume_any_line_comment(rdr);
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}
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fn consume_any_line_comment(rdr: reader) {
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if rdr.curr == '/' {
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alt rdr.next() {
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'/' {
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while rdr.curr != '\n' && !rdr.is_eof() { rdr.bump(); }
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// Restart whitespace munch.
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be consume_whitespace_and_comments(rdr);
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}
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'*' { rdr.bump(); rdr.bump(); be consume_block_comment(rdr); }
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_ { ret; }
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}
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}
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}
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fn consume_block_comment(rdr: reader) {
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let level: int = 1;
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while level > 0 {
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if rdr.is_eof() { rdr.fatal("unterminated block comment"); }
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if rdr.curr == '/' && rdr.next() == '*' {
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rdr.bump();
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rdr.bump();
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level += 1;
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} else {
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if rdr.curr == '*' && rdr.next() == '/' {
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rdr.bump();
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rdr.bump();
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level -= 1;
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} else { rdr.bump(); }
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}
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}
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// restart whitespace munch.
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be consume_whitespace_and_comments(rdr);
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}
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fn scan_exponent(rdr: reader) -> option::t<str> {
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let c = rdr.curr;
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let rslt = "";
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if c == 'e' || c == 'E' {
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str::push_byte(rslt, c as u8);
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rdr.bump();
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c = rdr.curr;
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if c == '-' || c == '+' {
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str::push_byte(rslt, c as u8);
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rdr.bump();
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}
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let exponent = scan_digits(rdr, 10u);
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if str::byte_len(exponent) > 0u {
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ret some(rslt + exponent);
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} else { rdr.fatal("scan_exponent: bad fp literal"); }
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} else { ret none::<str>; }
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}
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fn scan_digits(rdr: reader, radix: uint) -> str {
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let rslt = "";
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while true {
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let c = rdr.curr;
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if c == '_' { rdr.bump(); cont; }
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alt char::maybe_digit(c) {
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some(d) if (d as uint) < radix {
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str::push_byte(rslt, c as u8);
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rdr.bump();
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}
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_ { break; }
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}
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}
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ret rslt;
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}
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fn scan_number(c: char, rdr: reader) -> token::token {
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let num_str, base = 10u, c = c, n = rdr.next();
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if c == '0' && n == 'x' {
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rdr.bump();
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rdr.bump();
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base = 16u;
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} else if c == '0' && n == 'b' {
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rdr.bump();
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rdr.bump();
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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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n = rdr.next();
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if c == 'u' || c == 'i' {
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let signed = c == 'i', tp = if signed { either::left(ast::ty_i) }
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else { either::right(ast::ty_u) };
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rdr.bump();
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c = rdr.curr;
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if c == '8' {
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rdr.bump();
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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 = rdr.next();
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if c == '1' && n == '6' {
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rdr.bump();
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rdr.bump();
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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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rdr.bump();
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rdr.bump();
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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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rdr.bump();
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rdr.bump();
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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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let parsed = u64::from_str(num_str, base as u64);
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alt tp {
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either::left(t) { ret token::LIT_INT(parsed as i64, t); }
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either::right(t) { ret token::LIT_UINT(parsed, t); }
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}
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}
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let is_float = false;
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if rdr.curr == '.' && !(is_alpha(rdr.next()) || rdr.next() == '_') {
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is_float = true;
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rdr.bump();
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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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alt scan_exponent(rdr) {
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some(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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if rdr.curr == 'f' {
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rdr.bump();
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c = rdr.curr;
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n = rdr.next();
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if c == '3' && n == '2' {
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rdr.bump();
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rdr.bump();
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ret token::LIT_FLOAT(intern(*rdr.interner, num_str),
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ast::ty_f32);
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} else if c == '6' && n == '4' {
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rdr.bump();
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rdr.bump();
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ret token::LIT_FLOAT(intern(*rdr.interner, num_str),
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ast::ty_f64);
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/* FIXME: if this is out of range for either a 32-bit or
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64-bit float, it won't be noticed till the back-end */
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} else {
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is_float = true;
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}
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}
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if is_float {
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ret token::LIT_FLOAT(interner::intern(*rdr.interner, num_str),
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ast::ty_f);
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} else {
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let parsed = u64::from_str(num_str, base as u64);
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ret token::LIT_INT(parsed as i64, ast::ty_i);
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}
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}
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fn scan_numeric_escape(rdr: reader, n_hex_digits: uint) -> char {
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let accum_int = 0, i = n_hex_digits;
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while i != 0u {
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let n = rdr.curr;
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rdr.bump();
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if !is_hex_digit(n) {
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rdr.fatal(#fmt["illegal numeric character escape: %d", n as int]);
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}
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accum_int *= 16;
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accum_int += hex_digit_val(n);
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i -= 1u;
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}
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ret accum_int as char;
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}
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fn next_token(rdr: reader) -> {tok: token::token, chpos: uint, bpos: uint} {
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consume_whitespace_and_comments(rdr);
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let start_chpos = rdr.chpos;
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let start_bpos = rdr.pos;
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let tok = if rdr.is_eof() { token::EOF } else { next_token_inner(rdr) };
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ret {tok: tok, chpos: start_chpos, bpos: start_bpos};
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}
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fn next_token_inner(rdr: reader) -> token::token {
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let accum_str = "";
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let c = rdr.curr;
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if char::is_XID_start(c) || c == '_' {
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while char::is_XID_continue(c) {
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str::push_char(accum_str, c);
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rdr.bump();
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c = rdr.curr;
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}
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if str::eq(accum_str, "_") { ret token::UNDERSCORE; }
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let is_mod_name = c == ':' && rdr.next() == ':';
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// FIXME: perform NFKC normalization here.
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ret token::IDENT(interner::intern::<str>(*rdr.interner,
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accum_str), is_mod_name);
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}
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if is_dec_digit(c) {
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ret scan_number(c, rdr);
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}
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fn binop(rdr: reader, op: token::binop) -> token::token {
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rdr.bump();
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if rdr.curr == '=' {
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rdr.bump();
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ret token::BINOPEQ(op);
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} else { ret token::BINOP(op); }
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}
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alt c {
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// One-byte tokens.
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';' { rdr.bump(); ret token::SEMI; }
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',' { rdr.bump(); ret token::COMMA; }
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'.' {
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rdr.bump();
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if rdr.curr == '.' && rdr.next() == '.' {
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rdr.bump();
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rdr.bump();
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ret token::ELLIPSIS;
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}
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ret token::DOT;
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}
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'(' { rdr.bump(); ret token::LPAREN; }
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')' { rdr.bump(); ret token::RPAREN; }
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'{' { rdr.bump(); ret token::LBRACE; }
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'}' { rdr.bump(); ret token::RBRACE; }
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'[' { rdr.bump(); ret token::LBRACKET; }
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']' { rdr.bump(); ret token::RBRACKET; }
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'@' { rdr.bump(); ret token::AT; }
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'#' {
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rdr.bump();
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if rdr.curr == '<' { rdr.bump(); ret token::POUND_LT; }
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if rdr.curr == '{' { rdr.bump(); ret token::POUND_LBRACE; }
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ret token::POUND;
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}
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'~' { rdr.bump(); ret token::TILDE; }
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':' {
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rdr.bump();
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if rdr.curr == ':' {
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rdr.bump();
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ret token::MOD_SEP;
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} else { ret token::COLON; }
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}
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// Multi-byte tokens.
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'=' {
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rdr.bump();
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if rdr.curr == '=' {
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rdr.bump();
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ret token::EQEQ;
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} else { ret token::EQ; }
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}
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'!' {
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rdr.bump();
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if rdr.curr == '=' {
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rdr.bump();
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ret token::NE;
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} else { ret token::NOT; }
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}
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'<' {
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rdr.bump();
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alt rdr.curr {
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'=' { rdr.bump(); ret token::LE; }
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'<' { ret binop(rdr, token::LSL); }
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'-' {
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rdr.bump();
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alt rdr.curr {
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'>' { rdr.bump(); ret token::DARROW; }
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_ { ret token::LARROW; }
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}
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}
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_ { ret token::LT; }
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}
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}
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'>' {
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rdr.bump();
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alt rdr.curr {
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'=' { rdr.bump(); ret token::GE; }
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'>' {
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if rdr.next() == '>' {
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rdr.bump();
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ret binop(rdr, token::ASR);
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} else { ret binop(rdr, token::LSR); }
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}
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_ { ret token::GT; }
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}
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}
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'\'' {
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rdr.bump();
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let c2 = rdr.curr;
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rdr.bump();
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if c2 == '\\' {
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let escaped = rdr.curr;
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rdr.bump();
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alt escaped {
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'n' { c2 = '\n'; }
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'r' { c2 = '\r'; }
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't' { c2 = '\t'; }
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'\\' { c2 = '\\'; }
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'\'' { c2 = '\''; }
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'x' { c2 = scan_numeric_escape(rdr, 2u); }
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'u' { c2 = scan_numeric_escape(rdr, 4u); }
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'U' { c2 = scan_numeric_escape(rdr, 8u); }
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c2 {
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rdr.fatal(#fmt["unknown character escape: %d", c2 as int]);
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}
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}
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}
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if rdr.curr != '\'' {
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rdr.fatal("unterminated character constant");
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}
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rdr.bump(); // advance curr past token
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ret token::LIT_INT(c2 as i64, ast::ty_char);
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}
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'"' {
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let n = rdr.chpos;
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rdr.bump();
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while rdr.curr != '"' {
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if rdr.is_eof() {
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rdr.fatal(#fmt["unterminated double quote string: %s",
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rdr.get_str_from(n)]);
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}
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let ch = rdr.curr;
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rdr.bump();
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alt ch {
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'\\' {
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let escaped = rdr.curr;
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rdr.bump();
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alt escaped {
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'n' { str::push_byte(accum_str, '\n' as u8); }
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'r' { str::push_byte(accum_str, '\r' as u8); }
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't' { str::push_byte(accum_str, '\t' as u8); }
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'\\' { str::push_byte(accum_str, '\\' as u8); }
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'"' { str::push_byte(accum_str, '"' as u8); }
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'\n' { consume_whitespace(rdr); }
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'x' {
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str::push_char(accum_str, scan_numeric_escape(rdr, 2u));
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}
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'u' {
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str::push_char(accum_str, scan_numeric_escape(rdr, 4u));
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}
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'U' {
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str::push_char(accum_str, scan_numeric_escape(rdr, 8u));
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}
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c2 {
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rdr.fatal(#fmt["unknown string escape: %d", c2 as int]);
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}
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}
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}
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_ { str::push_char(accum_str, ch); }
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}
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}
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rdr.bump();
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ret token::LIT_STR(interner::intern::<str>(*rdr.interner,
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accum_str));
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}
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'-' {
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if rdr.next() == '>' {
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rdr.bump();
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rdr.bump();
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ret token::RARROW;
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} else { ret binop(rdr, token::MINUS); }
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}
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'&' {
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if rdr.next() == '&' {
|
|
rdr.bump();
|
|
rdr.bump();
|
|
ret token::ANDAND;
|
|
} else { ret binop(rdr, token::AND); }
|
|
}
|
|
'|' {
|
|
alt rdr.next() {
|
|
'|' { rdr.bump(); rdr.bump(); ret token::OROR; }
|
|
_ { ret binop(rdr, token::OR); }
|
|
}
|
|
}
|
|
'+' { ret binop(rdr, token::PLUS); }
|
|
'*' { ret binop(rdr, token::STAR); }
|
|
'/' { ret binop(rdr, token::SLASH); }
|
|
'^' { ret binop(rdr, token::CARET); }
|
|
'%' { ret binop(rdr, token::PERCENT); }
|
|
c { rdr.fatal(#fmt["unkown start of token: %d", c as int]); }
|
|
}
|
|
}
|
|
|
|
enum cmnt_style {
|
|
isolated, // No code on either side of each line of the comment
|
|
trailing, // Code exists to the left of the comment
|
|
mixed, // Code before /* foo */ and after the comment
|
|
blank_line, // Just a manual blank line "\n\n", for layout
|
|
}
|
|
|
|
type cmnt = {style: cmnt_style, lines: [str], pos: uint};
|
|
|
|
fn read_to_eol(rdr: reader) -> str {
|
|
let val = "";
|
|
while rdr.curr != '\n' && !rdr.is_eof() {
|
|
str::push_char(val, rdr.curr);
|
|
rdr.bump();
|
|
}
|
|
if rdr.curr == '\n' { rdr.bump(); }
|
|
ret val;
|
|
}
|
|
|
|
fn read_one_line_comment(rdr: reader) -> str {
|
|
let val = read_to_eol(rdr);
|
|
assert (val[0] == '/' as u8 && val[1] == '/' as u8);
|
|
ret val;
|
|
}
|
|
|
|
fn consume_whitespace(rdr: reader) {
|
|
while is_whitespace(rdr.curr) && !rdr.is_eof() { rdr.bump(); }
|
|
}
|
|
|
|
fn consume_non_eol_whitespace(rdr: reader) {
|
|
while is_whitespace(rdr.curr) && rdr.curr != '\n' && !rdr.is_eof() {
|
|
rdr.bump();
|
|
}
|
|
}
|
|
|
|
fn push_blank_line_comment(rdr: reader, &comments: [cmnt]) {
|
|
#debug(">>> blank-line comment");
|
|
let v: [str] = [];
|
|
comments += [{style: blank_line, lines: v, pos: rdr.chpos}];
|
|
}
|
|
|
|
fn consume_whitespace_counting_blank_lines(rdr: reader, &comments: [cmnt]) {
|
|
while is_whitespace(rdr.curr) && !rdr.is_eof() {
|
|
if rdr.col == 0u && rdr.curr == '\n' {
|
|
push_blank_line_comment(rdr, comments);
|
|
}
|
|
rdr.bump();
|
|
}
|
|
}
|
|
|
|
fn read_line_comments(rdr: reader, code_to_the_left: bool) -> cmnt {
|
|
#debug(">>> line comments");
|
|
let p = rdr.chpos;
|
|
let lines: [str] = [];
|
|
while rdr.curr == '/' && rdr.next() == '/' {
|
|
let line = read_one_line_comment(rdr);
|
|
log(debug, line);
|
|
lines += [line];
|
|
consume_non_eol_whitespace(rdr);
|
|
}
|
|
#debug("<<< line comments");
|
|
ret {style: if code_to_the_left { trailing } else { isolated },
|
|
lines: lines,
|
|
pos: p};
|
|
}
|
|
|
|
fn all_whitespace(s: str, begin: uint, end: uint) -> bool {
|
|
let i: uint = begin;
|
|
while i != end { if !is_whitespace(s[i] as char) { ret false; } i += 1u; }
|
|
ret true;
|
|
}
|
|
|
|
fn trim_whitespace_prefix_and_push_line(&lines: [str], s: str, col: uint) {
|
|
let s1;
|
|
if all_whitespace(s, 0u, col) {
|
|
if col < str::byte_len(s) {
|
|
s1 = str::slice(s, col, str::byte_len(s));
|
|
} else { s1 = ""; }
|
|
} else { s1 = s; }
|
|
log(debug, "pushing line: " + s1);
|
|
lines += [s1];
|
|
}
|
|
|
|
fn read_block_comment(rdr: reader, code_to_the_left: bool) -> cmnt {
|
|
#debug(">>> block comment");
|
|
let p = rdr.chpos;
|
|
let lines: [str] = [];
|
|
let col: uint = rdr.col;
|
|
rdr.bump();
|
|
rdr.bump();
|
|
let curr_line = "/*";
|
|
let level: int = 1;
|
|
while level > 0 {
|
|
#debug("=== block comment level %d", level);
|
|
if rdr.is_eof() { rdr.fatal("unterminated block comment"); }
|
|
if rdr.curr == '\n' {
|
|
trim_whitespace_prefix_and_push_line(lines, curr_line, col);
|
|
curr_line = "";
|
|
rdr.bump();
|
|
} else {
|
|
str::push_char(curr_line, rdr.curr);
|
|
if rdr.curr == '/' && rdr.next() == '*' {
|
|
rdr.bump();
|
|
rdr.bump();
|
|
curr_line += "*";
|
|
level += 1;
|
|
} else {
|
|
if rdr.curr == '*' && rdr.next() == '/' {
|
|
rdr.bump();
|
|
rdr.bump();
|
|
curr_line += "/";
|
|
level -= 1;
|
|
} else { rdr.bump(); }
|
|
}
|
|
}
|
|
}
|
|
if str::byte_len(curr_line) != 0u {
|
|
trim_whitespace_prefix_and_push_line(lines, curr_line, col);
|
|
}
|
|
let style = if code_to_the_left { trailing } else { isolated };
|
|
consume_non_eol_whitespace(rdr);
|
|
if !rdr.is_eof() && rdr.curr != '\n' && vec::len(lines) == 1u {
|
|
style = mixed;
|
|
}
|
|
#debug("<<< block comment");
|
|
ret {style: style, lines: lines, pos: p};
|
|
}
|
|
|
|
fn peeking_at_comment(rdr: reader) -> bool {
|
|
ret rdr.curr == '/' && rdr.next() == '/' ||
|
|
rdr.curr == '/' && rdr.next() == '*';
|
|
}
|
|
|
|
fn consume_comment(rdr: reader, code_to_the_left: bool, &comments: [cmnt]) {
|
|
#debug(">>> consume comment");
|
|
if rdr.curr == '/' && rdr.next() == '/' {
|
|
comments += [read_line_comments(rdr, code_to_the_left)];
|
|
} else if rdr.curr == '/' && rdr.next() == '*' {
|
|
comments += [read_block_comment(rdr, code_to_the_left)];
|
|
} else { fail; }
|
|
#debug("<<< consume comment");
|
|
}
|
|
|
|
fn is_lit(t: token::token) -> bool {
|
|
ret alt t {
|
|
token::LIT_INT(_, _) { true }
|
|
token::LIT_UINT(_, _) { true }
|
|
token::LIT_FLOAT(_, _) { true }
|
|
token::LIT_STR(_) { true }
|
|
token::LIT_BOOL(_) { true }
|
|
_ { false }
|
|
}
|
|
}
|
|
|
|
type lit = {lit: str, pos: uint};
|
|
|
|
fn gather_comments_and_literals(cm: codemap::codemap,
|
|
span_diagnostic: diagnostic::span_handler,
|
|
path: str,
|
|
srdr: io::reader) ->
|
|
{cmnts: [cmnt], lits: [lit]} {
|
|
let src = @str::from_bytes(srdr.read_whole_stream());
|
|
let itr = @interner::mk::<str>(str::hash, str::eq);
|
|
let rdr = new_reader(cm, span_diagnostic,
|
|
codemap::new_filemap(path, src, 0u, 0u), itr);
|
|
let comments: [cmnt] = [];
|
|
let literals: [lit] = [];
|
|
let first_read: bool = true;
|
|
while !rdr.is_eof() {
|
|
while true {
|
|
let code_to_the_left = !first_read;
|
|
consume_non_eol_whitespace(rdr);
|
|
if rdr.curr == '\n' {
|
|
code_to_the_left = false;
|
|
consume_whitespace_counting_blank_lines(rdr, comments);
|
|
}
|
|
while peeking_at_comment(rdr) {
|
|
consume_comment(rdr, code_to_the_left, comments);
|
|
consume_whitespace_counting_blank_lines(rdr, comments);
|
|
}
|
|
break;
|
|
}
|
|
let tok = next_token(rdr);
|
|
if is_lit(tok.tok) {
|
|
literals += [{lit: rdr.get_str_from(tok.bpos), pos: tok.chpos}];
|
|
}
|
|
log(debug, "tok: " + token::to_str(rdr, tok.tok));
|
|
first_read = false;
|
|
}
|
|
ret {cmnts: comments, lits: literals};
|
|
}
|
|
|
|
//
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// End:
|
|
//
|