94 lines
3.0 KiB
Rust
94 lines
3.0 KiB
Rust
// Copyright 2016 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 std::panic;
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use errors::FatalError;
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use syntax::codemap::Span;
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use syntax::ext::base::*;
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use syntax::tokenstream::TokenStream;
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use syntax::ext::base;
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use proc_macro::TokenStream as TsShim;
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use proc_macro::__internal;
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pub struct AttrProcMacro {
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pub inner: fn(TsShim, TsShim) -> TsShim,
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}
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impl base::AttrProcMacro for AttrProcMacro {
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fn expand<'cx>(&self,
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ecx: &'cx mut ExtCtxt,
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span: Span,
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annotation: TokenStream,
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annotated: TokenStream)
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-> TokenStream {
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let annotation = __internal::token_stream_wrap(annotation);
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let annotated = __internal::token_stream_wrap(annotated);
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let res = __internal::set_sess(ecx, || {
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panic::catch_unwind(panic::AssertUnwindSafe(|| (self.inner)(annotation, annotated)))
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});
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match res {
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Ok(stream) => __internal::token_stream_inner(stream),
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Err(e) => {
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let msg = "custom attribute panicked";
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let mut err = ecx.struct_span_fatal(span, msg);
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if let Some(s) = e.downcast_ref::<String>() {
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err.help(&format!("message: {}", s));
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}
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if let Some(s) = e.downcast_ref::<&'static str>() {
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err.help(&format!("message: {}", s));
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}
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err.emit();
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panic!(FatalError);
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}
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}
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}
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}
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pub struct BangProcMacro {
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pub inner: fn(TsShim) -> TsShim,
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}
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impl base::ProcMacro for BangProcMacro {
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fn expand<'cx>(&self,
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ecx: &'cx mut ExtCtxt,
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span: Span,
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input: TokenStream)
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-> TokenStream {
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let input = __internal::token_stream_wrap(input);
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let res = __internal::set_sess(ecx, || {
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panic::catch_unwind(panic::AssertUnwindSafe(|| (self.inner)(input)))
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});
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match res {
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Ok(stream) => __internal::token_stream_inner(stream),
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Err(e) => {
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let msg = "proc macro panicked";
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let mut err = ecx.struct_span_fatal(span, msg);
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if let Some(s) = e.downcast_ref::<String>() {
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err.help(&format!("message: {}", s));
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}
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if let Some(s) = e.downcast_ref::<&'static str>() {
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err.help(&format!("message: {}", s));
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}
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err.emit();
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panic!(FatalError);
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}
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}
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}
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}
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