Update ElixirLexer and example_elixir.ex

Elixir syntax has evolved quite significantly since the initial lexer
was written. In this update I have rewritten most of the code to support
modern Elixir (as of v0.14.0-dev).

The example file has also been updated to give an quick overview
of most of the language constructs.

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/test_using_api.py b/tests/test_using_api.py
new file mode 100644
index 00000000..9e53c206
--- /dev/null
+++ b/tests/test_using_api.py
@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+"""
+    Pygments tests for using()
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    :copyright: Copyright 2006-2014 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import unittest
+
+from pygments.lexer import using, bygroups, this, RegexLexer
+from pygments.token import String, Text, Keyword
+
+class TestLexer(RegexLexer):
+    tokens = {
+        'root': [
+            (r'#.*',
+             using(this, state='invalid')),
+            (r'(")(.+?)(")',
+             bygroups(String, using(this, state='string'), String)),
+            (r'[^"]+', Text),
+        ],
+        'string': [
+            (r'.+', Keyword),
+        ],
+    }
+
+
+class UsingStateTest(unittest.TestCase):
+    def test_basic(self):
+        expected = [(Text, 'a'), (String, '"'), (Keyword, 'bcd'),
+                    (String, '"'), (Text, 'e\n')]
+        t = list(TestLexer().get_tokens('a"bcd"e'))
+        self.assertEqual(t, expected)
+
+    def test_error(self):
+        def gen():
+            return list(TestLexer().get_tokens('#a'))
+        self.assertRaises(KeyError, gen)