Rewrite parser to support block/dynamic comments

tests/test_todo_parser.py

@@ -0,0 +1,60 @@
+import unittest
+from main import TodoParser
+
+
+def count_issues_for_file_type(raw_issues, file_type):
+    num_issues = 0
+    for issue in raw_issues:
+        if issue.markdown_language == file_type:
+            num_issues += 1
+    return num_issues
+
+
+class NewIssueTests(unittest.TestCase):
+    # Check for newly added TODOs across the files specified (covers all current marker types).
+    def setUp(self):
+        diff_file = open('tests/test_new.diff', 'r')
+        self.raw_issues = TodoParser().parse(diff_file)
+
+    def test_python_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'python'), 2)
+
+    def test_yaml_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'yaml'), 2)
+
+    def test_php_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'php'), 3)
+
+    def test_java_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'java'), 2)
+
+    def test_css_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'css'), 2)
+
+    def test_ruby_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'ruby'), 3)
+
+
+class ClosedIssueTests(unittest.TestCase):
+    # Check for removed TODOs across the files specified (covers all current marker types).
+    def setUp(self):
+        diff_file = open('tests/test_closed.diff', 'r')
+        self.raw_issues = TodoParser().parse(diff_file)
+
+    def test_python_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'python'), 2)
+
+    def test_yaml_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'yaml'), 2)
+
+    def test_php_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'php'), 3)
+
+    def test_java_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'java'), 2)
+
+    def test_css_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'css'), 2)
+
+    def test_ruby_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'ruby'), 3)