Add a JSON error emitter

src/libsyntax/errors/json.rs

@@ -0,0 +1,53 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! A JSON emitter for errors.
+
+use codemap::{Span, CodeMap};
+use diagnostics::registry::Registry;
+use errors::{Level, DiagnosticBuilder, RenderSpan};
+use errors::emitter::Emitter;
+
+use std::rc::Rc;
+
+pub struct JsonEmitter {
+    todo: i32
+}
+
+impl JsonEmitter {
+    pub fn basic() -> JsonEmitter {
+        JsonEmitter {
+            todo: 42,
+        }
+    }
+
+    pub fn stderr(registry: Option<Registry>,
+                  code_map: Rc<CodeMap>) -> JsonEmitter {
+        JsonEmitter {
+            todo: 42,
+        }
+    }
+}
+
+impl Emitter for JsonEmitter {
+    fn emit(&mut self, span: Option<Span>, msg: &str, code: Option<&str>, lvl: Level) {
+        unimplemented!();
+
+    }
+
+    fn custom_emit(&mut self, sp: RenderSpan, msg: &str, lvl: Level) {
+        unimplemented!();
+
+    }
+
+    fn emit_struct(&mut self, db: &DiagnosticBuilder) {
+        unimplemented!();
+    }
+}

src/libsyntax/errors/mod.rs

@@ -24,6 +24,7 @@
 use term;
 
 pub mod emitter;
+pub mod json;
 
 #[derive(Clone)]
 pub enum RenderSpan {