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import std._io;
import driver.session;
import util.common;
state type parser =
state obj {
state fn peek() -> token.token;
state fn bump();
io fn err(str s);
fn get_session() -> session.session;
fn get_span() -> common.span;
};
state fn new_parser(session.session sess, str path) -> parser {
state obj stdio_parser(session.session sess,
mutable token.token tok,
mutable common.pos lo,
mutable common.pos hi,
lexer.reader rdr)
{
state fn peek() -> token.token {
ret tok;
}
state fn bump() {
tok = lexer.next_token(rdr);
lo = rdr.get_mark_pos();
hi = rdr.get_curr_pos();
}
io fn err(str m) {
auto span = rec(filename = rdr.get_filename(),
lo = lo, hi = hi);
sess.span_err(span, m);
}
fn get_session() -> session.session {
ret sess;
}
fn get_span() -> common.span {
ret rec(filename = rdr.get_filename(),
lo = lo, hi = hi);
}
}
auto srdr = _io.new_stdio_reader(path);
auto rdr = lexer.new_reader(srdr, path);
auto npos = rdr.get_curr_pos();
ret stdio_parser(sess, lexer.next_token(rdr), npos, npos, rdr);
}
state fn expect(parser p, token.token t) {
// FIXME: comparing tags would be good. One of these days.
if (true /* p.peek() == t */) {
p.bump();
} else {
let str s = "expecting ";
s += token.to_str(t);
s += ", found ";
s += token.to_str(t);
p.err(s);
}
}
state fn parse_ident(parser p) -> ast.ident {
alt (p.peek()) {
case (token.IDENT(i)) { ret i; }
case (_) {
p.err("expecting ident");
fail;
}
}
}
state fn parse_item(parser p) -> tup(ast.ident, ast.item) {
alt (p.peek()) {
case (token.FN()) {
p.bump();
auto id = parse_ident(p);
expect(p, token.LPAREN());
let vec[rec(ast.slot slot, ast.ident ident)] inputs = vec();
let vec[@ast.stmt] body = vec();
auto output = rec(ty = ast.ty_nil(), mode = ast.val() );
let ast._fn f = rec(inputs = inputs,
output = output,
body = body);
ret tup(id, ast.item_fn(@f));
}
}
p.err("expecting item");
fail;
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
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