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syntax: remove some dead code.

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This commit is contained in:
Huon Wilson 2013-10-02 11:43:10 +10:00
parent fe4e7478c5
commit bbbafc4e46
1 changed files with 0 additions and 73 deletions
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73
src/libsyntax/ext/tt/macro_rules.rs
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@ -185,79 +185,6 @@ pub fn add_new_extension(cx: @ExtCtxt,
_ => cx.span_bug(sp, "wrong-structured rhs")
};
// Given `lhses` and `rhses`, this is the new macro we create
fn generic_extension(cx: @ExtCtxt,
sp: Span,
name: Ident,
arg: &[ast::token_tree],
lhses: &[@named_match],
rhses: &[@named_match])
-> MacResult {
if cx.trace_macros() {
println!("{}! \\{ {} \\}",
cx.str_of(name),
print::pprust::tt_to_str(
&ast::tt_delim(@mut arg.to_owned()),
get_ident_interner()));
}
// Which arm's failure should we report? (the one furthest along)
let mut best_fail_spot = dummy_sp();
let mut best_fail_msg = ~"internal error: ran no matchers";
let s_d = cx.parse_sess().span_diagnostic;
for (i, lhs) in lhses.iter().enumerate() { // try each arm's matchers
match *lhs {
@matched_nonterminal(nt_matchers(ref mtcs)) => {
// `none` is because we're not interpolating
let arg_rdr = new_tt_reader(
s_d,
None,
arg.to_owned()
) as @mut reader;
match parse(cx.parse_sess(), cx.cfg(), arg_rdr, *mtcs) {
success(named_matches) => {
let rhs = match rhses[i] {
// okay, what's your transcriber?
@matched_nonterminal(nt_tt(@ref tt)) => {
match (*tt) {
// cut off delimiters; don't parse 'em
tt_delim(ref tts) => {
(*tts).slice(1u,(*tts).len()-1u).to_owned()
}
_ => cx.span_fatal(
sp, "macro rhs must be delimited")
}
},
_ => cx.span_bug(sp, "bad thing in rhs")
};
// rhs has holes ( `$id` and `$(...)` that need filled)
let trncbr = new_tt_reader(s_d, Some(named_matches),
rhs);
let p = @Parser(cx.parse_sess(),
cx.cfg(),
trncbr as @mut reader);
// Let the context choose how to interpret the result.
// Weird, but useful for X-macros.
return MRAny(@ParserAnyMacro {
parser: p
} as @AnyMacro);
}
failure(sp, ref msg) => if sp.lo >= best_fail_spot.lo {
best_fail_spot = sp;
best_fail_msg = (*msg).clone();
},
error(sp, ref msg) => cx.span_fatal(sp, (*msg))
}
}
_ => cx.bug("non-matcher found in parsed lhses")
}
}
cx.span_fatal(best_fail_spot, best_fail_msg);
}
let exp = @MacroRulesSyntaxExpanderTTFun {
name: name,
lhses: lhses,