blog_filename = "blog_dict.pickle"
try:
- import cPickle as pickle
+ import cPickle as pickle
except ImportError:
- import pickle
+ import pickle
try:
- blog_file = open(blog_filename, "rb")
+ blog_file = open('../../../../phdru.name/ru/' + blog_filename, "rb")
except IOError:
- blog_dict = {}
+ blog_dict = {}
else:
- blog_dict = pickle.load(blog_file)
- blog_file.close()
+ blog_dict = pickle.load(blog_file)
+ blog_file.close()
# blog_dict is a mapping
# (year, month, day) => [list of (file, title, lead, tags)]
def tag_exists(tag):
- for posts in blog_dict.itervalues():
- for _file, _title, _lead, tags in posts:
- if tag in tags:
+ for posts in blog_dict.values():
+ for _file, _title, _lead, _tags in posts:
+ if tag in _tags:
return True
return False
+
+
+def _test_post(post, tree):
+ """Test if the list of tags in the post satisfies condition
+
+ Recursively evaluate the tree against the list of tags in the post.
+
+ """
+ op = tree[0]
+ if op == 'NAME':
+ tag = tree[1]
+ assert isinstance(tag, str)
+ _tags = post[3]
+ return tag in _tags
+ elif op in ('AND', 'OR'):
+ value1 = _test_post(post, tree[1])
+ value2 = _test_post(post, tree[2])
+ if op == 'AND':
+ return value1 and value2
+ if op == 'OR':
+ return value1 or value2
+ elif op == 'NOT':
+ return not _test_post(post, tree[1])
+ elif op == 'PARENS':
+ return _test_post(post, tree[1])
+ else:
+ raise ValueError("Cannot get there")
+
+
+def find_tags(tree):
+ """Test every blog post against parsed expression
+
+ Return all posts that passed the test.
+
+ """
+ _posts = []
+ for (year, month, day), posts in blog_dict.items():
+ for post in posts:
+ if _test_post(post, tree):
+ _posts.append((
+ year, month, day,
+ '/'.join(
+ (year, month, day, post[0][:-len("tmpl")] + "html")),
+ post[1]))
+ _posts.sort(reverse=True)
+ return _posts