From acfccc515bfbed098f46c6530d57aaef846b99ca Mon Sep 17 00:00:00 2001
From: Nick Cameron <ncameron@mozilla.com>
Date: Thu, 31 Dec 2015 14:43:42 +1300
Subject: [PATCH] Add a JSON error emitter

---
 src/libsyntax/errors/json.rs | 53 ++++++++++++++++++++++++++++++++++++
 src/libsyntax/errors/mod.rs  |  1 +
 2 files changed, 54 insertions(+)
 create mode 100644 src/libsyntax/errors/json.rs

diff --git a/src/libsyntax/errors/json.rs b/src/libsyntax/errors/json.rs
new file mode 100644
index 00000000000..feae71f55d3
--- /dev/null
+++ b/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!();
+    }
+}
diff --git a/src/libsyntax/errors/mod.rs b/src/libsyntax/errors/mod.rs
index a2fae975148..733798c197a 100644
--- a/src/libsyntax/errors/mod.rs
+++ b/src/libsyntax/errors/mod.rs
@@ -24,6 +24,7 @@
 use term;
 
 pub mod emitter;
+pub mod json;
 
 #[derive(Clone)]
 pub enum RenderSpan {