Add errors.classify

errors.js

@@ -134,3 +134,32 @@ module.exports.ZeroLengthChunk = TypedError({
     type: 'bufrw.zero-length-chunk',
     message: 'zero length chunk encountered'
 });
+
+module.exports.classify = classify;
+
+function classify(err) {
+    switch (err.type) {
+        case 'bufrw.broken-reader-state':
+        case 'bufrw.unstable-rw':
+            return 'Internal';
+
+        case 'bufrw.invalid-argument':
+        case 'bufrw.read.invalid-switch-value':
+        case 'bufrw.short-buffer':
+        case 'bufrw.short-read':
+        case 'bufrw.truncated-read':
+        case 'bufrw.zero-length-chunk':
+            return 'Read';
+
+        case 'bufrw.fixed-length-mismatch':
+        case 'bufrw.missing.struct-field':
+        case 'bufrw.range-error':
+        case 'bufrw.short-write':
+        case 'bufrw.write.invalid-switch-value':
+            return 'Write';
+
+        // istanbul ignore next
+        default:
+            return null;
+    }
+}

test/errors.js

@@ -0,0 +1,41 @@
+// Copyright (c) 2015 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+'use strict';
+
+var test = require('tape');
+
+var errors = require('../errors');
+
+test('all errors should be classified', function t(assert) {
+    var keys = Object.keys(errors);
+    for (var i = 0; i < keys.length; i++) {
+        var key = keys[i];
+        if (key[0].toUpperCase() === key[0]) {
+            var Type = errors[key];
+            var err = new Type(new Error('e'));
+            assert.notEquals(
+                errors.classify(err), null,
+                'expected ' + err.type + ' to be classified');
+        }
+    }
+
+    assert.end();
+});

test/index.js

@@ -20,6 +20,7 @@
 
 'use strict';
 
+require('./errors');
 require('./interface');
 require('./atoms');
 require('./fixed_width_rw');