From 85e1a0c29c3f659fa1f36e94788a00b3e864b9d3 Mon Sep 17 00:00:00 2001
From: Dmitry Shachnev <mitya57@gmail.com>
Date: Wed, 25 Sep 2013 11:39:16 +0400
Subject: Add new utility function parseBoolValue() and use it in all extension
 that need parsing bool config values.

---
 markdown/extensions/headerid.py | 15 +++------------
 markdown/extensions/smarty.py   | 11 ++---------
 markdown/extensions/toc.py      |  4 ++--
 markdown/util.py                | 13 +++++++++++++
 4 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/markdown/extensions/headerid.py b/markdown/extensions/headerid.py
index 0476f9e..8221fe1 100644
--- a/markdown/extensions/headerid.py
+++ b/markdown/extensions/headerid.py
@@ -78,7 +78,7 @@ from __future__ import absolute_import
 from __future__ import unicode_literals
 from . import Extension
 from ..treeprocessors import Treeprocessor
-from ..util import HTML_PLACEHOLDER_RE
+from ..util import HTML_PLACEHOLDER_RE, parseBoolValue
 import re
 import logging
 import unicodedata
@@ -166,23 +166,14 @@ class HeaderIdTreeprocessor(Treeprocessor):
     def _get_meta(self):
         """ Return meta data suported by this ext as a tuple """
         level = int(self.config['level']) - 1
-        force = self._str2bool(self.config['forceid'])
+        force = parseBoolValue(self.config['forceid'])
         if hasattr(self.md, 'Meta'):
             if 'header_level' in self.md.Meta:
                 level = int(self.md.Meta['header_level'][0]) - 1
             if 'header_forceid' in self.md.Meta: 
-                force = self._str2bool(self.md.Meta['header_forceid'][0])
+                force = parseBoolValue(self.md.Meta['header_forceid'][0])
         return level, force
 
-    def _str2bool(self, s, default=False):
-        """ Convert a string to a booleen value. """
-        s = str(s)
-        if s.lower() in ['0', 'f', 'false', 'off', 'no', 'n']:
-            return False
-        elif s.lower() in ['1', 't', 'true', 'on', 'yes', 'y']:
-            return True
-        return default
-
 
 class HeaderIdExtension(Extension):
     def __init__(self, configs):
diff --git a/markdown/extensions/smarty.py b/markdown/extensions/smarty.py
index 18f9217..a0737b7 100644
--- a/markdown/extensions/smarty.py
+++ b/markdown/extensions/smarty.py
@@ -68,6 +68,7 @@
 from __future__ import unicode_literals
 from . import Extension
 from ..inlinepatterns import HtmlPattern
+from ..util import parseBoolValue
 
 def canonicalize(regex):
     """
@@ -173,15 +174,7 @@ class SmartyExtension(Extension):
             'smart_ellipses': [True, 'Educate ellipses']
         }
         for key, value in configs:
-            if not isinstance(value, str):
-                value = bool(value)
-            elif value.lower() in ('true', 't', 'yes', 'y', '1'):
-                value = True
-            elif value.lower() in ('false', 'f', 'no', 'n', '0'):
-                value = False
-            else:
-                raise ValueError('Cannot parse bool value: %s' % value)
-            self.setConfig(key, value)
+            self.setConfig(key, parseBoolValue(value))
 
     def _addPatterns(self, md, patterns, serie):
         for ind, pattern in enumerate(patterns):
diff --git a/markdown/extensions/toc.py b/markdown/extensions/toc.py
index 99afba0..516f2c5 100644
--- a/markdown/extensions/toc.py
+++ b/markdown/extensions/toc.py
@@ -13,7 +13,7 @@ from __future__ import absolute_import
 from __future__ import unicode_literals
 from . import Extension
 from ..treeprocessors import Treeprocessor
-from ..util import etree
+from ..util import etree, parseBoolValue
 from .headerid import slugify, unique, itertext, stashedHTML2text
 import re
 
@@ -127,7 +127,7 @@ class TocTreeprocessor(Treeprocessor):
         div.attrib["class"] = "toc"
         header_rgx = re.compile("[Hh][123456]")
         
-        self.use_anchors = self.config["anchorlink"] in [1, '1', True, 'True', 'true']
+        self.use_anchors = parseBoolValue(self.config["anchorlink"])
         
         # Get a list of id attributes
         used_ids = set()
diff --git a/markdown/util.py b/markdown/util.py
index d292aad..0027176 100644
--- a/markdown/util.py
+++ b/markdown/util.py
@@ -84,6 +84,19 @@ def isBlockLevel(tag):
     # Some ElementTree tags are not strings, so return False.
     return False
 
+def parseBoolValue(value, fail_on_errors=True):
+    """Parses a string representing bool value. If parsing was successful,
+       returns True or False. If parsing was not successful, raises
+       ValueError, or, if fail_on_errors=False, returns None."""
+    if not isinstance(value, str):
+        return bool(value)
+    elif value.lower() in ('true', 'yes', 'y', 'on', '1'):
+        return True
+    elif value.lower() in ('false', 'no', 'n', 'off', '0'):
+        return False
+    elif fail_on_errors:
+        raise ValueError('Cannot parse bool value: %r' % value)
+
 """
 MISC AUXILIARY CLASSES
 =============================================================================
-- 
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