68 lines
2.2 KiB
Rust
68 lines
2.2 KiB
Rust
// Copyright 2012-2014 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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//! Support for parsing unsupported, old syntaxes, for the purpose of reporting errors. Parsing of
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//! these syntaxes is tested by compile-test/obsolete-syntax.rs.
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//!
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//! Obsolete syntax that becomes too hard to parse can be removed.
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use syntax_pos::Span;
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use parse::parser;
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/// The specific types of unsupported syntax
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#[derive(Copy, Clone, PartialEq, Eq, Hash)]
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pub enum ObsoleteSyntax {
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// Nothing here at the moment
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}
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pub trait ParserObsoleteMethods {
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/// Reports an obsolete syntax non-fatal error.
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fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax);
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fn report(&mut self,
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sp: Span,
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kind: ObsoleteSyntax,
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kind_str: &str,
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desc: &str,
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error: bool);
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}
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impl<'a> ParserObsoleteMethods for parser::Parser<'a> {
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/// Reports an obsolete syntax non-fatal error.
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#[allow(unused_variables)]
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#[allow(unreachable_code)]
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fn obsolete(&mut self, sp: Span, kind: ObsoleteSyntax) {
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let (kind_str, desc, error) = match kind {
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// Nothing here at the moment
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};
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self.report(sp, kind, kind_str, desc, error);
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}
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fn report(&mut self,
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sp: Span,
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kind: ObsoleteSyntax,
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kind_str: &str,
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desc: &str,
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error: bool) {
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let mut err = if error {
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self.diagnostic().struct_span_err(sp, &format!("obsolete syntax: {}", kind_str))
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} else {
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self.diagnostic().struct_span_warn(sp, &format!("obsolete syntax: {}", kind_str))
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};
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if !self.obsolete_set.contains(&kind) &&
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(error || self.sess.span_diagnostic.can_emit_warnings) {
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err.note(desc);
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self.obsolete_set.insert(kind);
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}
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err.emit();
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}
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}
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