pylint: upgrade to 1.4.0

third_party/pylint/checkers/spelling.py

+# Copyright 2014 Michal Nowikowski.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+"""Checker for spelling errors in comments and docstrings.
+"""
+
+import sys
+import tokenize
+import string
+import re
+
+if sys.version_info[0] >= 3:
+    maketrans = str.maketrans
+else:
+    maketrans = string.maketrans
+
+from pylint.interfaces import ITokenChecker, IAstroidChecker
+from pylint.checkers import BaseTokenChecker
+from pylint.checkers.utils import check_messages
+
+try:
+    import enchant
+except ImportError:
+    enchant = None
+
+if enchant is not None:
+    br = enchant.Broker()
+    dicts = br.list_dicts()
+    dict_choices = [''] + [d[0] for d in dicts]
+    dicts = ["%s (%s)" % (d[0], d[1].name) for d in dicts]
+    dicts = ", ".join(dicts)
+    instr = ""
+else:
+    dicts = "none"
+    dict_choices = ['']
+    instr = " To make it working install python-enchant package."
+
+table = maketrans("", "")
+
+class SpellingChecker(BaseTokenChecker):
+    """Check spelling in comments and docstrings"""
+    __implements__ = (ITokenChecker, IAstroidChecker)
+    name = 'spelling'
+    msgs = {
+        'C0401': ('Wrong spelling of a word \'%s\' in a comment:\n%s\n'
+                  '%s\nDid you mean: \'%s\'?',
+                  'wrong-spelling-in-comment',
+                  'Used when a word in comment is not spelled correctly.'),
+        'C0402': ('Wrong spelling of a word \'%s\' in a docstring:\n%s\n'
+                  '%s\nDid you mean: \'%s\'?',
+                  'wrong-spelling-in-docstring',
+                  'Used when a word in docstring is not spelled correctly.'),
+        }
+    options = (('spelling-dict',
+                {'default' : '', 'type' : 'choice', 'metavar' : '<dict name>',
+                 'choices': dict_choices,
+                 'help' : 'Spelling dictionary name. '
+                          'Available dictionaries: %s.%s' % (dicts, instr)}),
+               ('spelling-ignore-words',
+                {'default' : '',
+                 'type' : 'string',
+                 'metavar' : '<comma separated words>',
+                 'help' : 'List of comma separated words that '
+                          'should not be checked.'}),
+               ('spelling-private-dict-file',
+                {'default' : '',
+                 'type' : 'string',
+                 'metavar' : '<path to file>',
+                 'help' : 'A path to a file that contains private '
+                          'dictionary; one word per line.'}),
+               ('spelling-store-unknown-words',
+                {'default' : 'n', 'type' : 'yn', 'metavar' : '<y_or_n>',
+                 'help' : 'Tells whether to store unknown words to '
+                          'indicated private dictionary in '
+                          '--spelling-private-dict-file option instead of '
+                          'raising a message.'}),
+              )
+
+    def open(self):
+        self.initialized = False
+        self.private_dict_file = None
+
+        if enchant is None:
+            return
+        dict_name = self.config.spelling_dict
+        if not dict_name:
+            return
+
+        self.ignore_list = self.config.spelling_ignore_words.split(",")
+        # "param" appears in docstring in param description and
+        # "pylint" appears in comments in pylint pragmas.
+        self.ignore_list.extend(["param", "pylint"])
+
+        if self.config.spelling_private_dict_file:
+            self.spelling_dict = enchant.DictWithPWL(
+                dict_name, self.config.spelling_private_dict_file)
+            self.private_dict_file = open(
+                self.config.spelling_private_dict_file, "a")
+        else:
+            self.spelling_dict = enchant.Dict(dict_name)
+
+        if self.config.spelling_store_unknown_words:
+            self.unknown_words = set()
+
+        # Prepare regex for stripping punctuation signs from text.
+        # ' and _ are treated in a special way.
+        puncts = string.punctuation.replace("'", "").replace("_", "")
+        self.punctuation_regex = re.compile('[%s]' % re.escape(puncts))
+        self.initialized = True
+
+    def close(self):
+        if self.private_dict_file:
+            self.private_dict_file.close()
+
+    def _check_spelling(self, msgid, line, line_num):
+        line2 = line.strip()
+        # Replace ['afadf with afadf (but preserve don't)
+        line2 = re.sub("'([^a-zA-Z]|$)", " ", line2)
+        # Replace afadf'] with afadf (but preserve don't)
+        line2 = re.sub("([^a-zA-Z]|^)'", " ", line2)
+        # Replace punctuation signs with space e.g. and/or -> and or
+        line2 = self.punctuation_regex.sub(' ', line2)
+
+        words = []
+        for word in line2.split():
+            # Skip words with digits.
+            if len(re.findall(r"\d", word)) > 0:
+                continue
+
+            # Skip words with mixed big and small letters,
+            # they are probaly class names.
+            if (len(re.findall("[A-Z]", word)) > 0 and
+                    len(re.findall("[a-z]", word)) > 0 and
+                    len(word) > 2):
+                continue
+
+            # Skip words with _ - they are probably function parameter names.
+            if word.count('_') > 0:
+                continue
+
+            words.append(word)
+
+        # Go through words and check them.
+        for word in words:
+            # Skip words from ignore list.
+            if word in self.ignore_list:
+                continue
+
+            orig_word = word
+            word = word.lower()
+
+            # Strip starting u' from unicode literals and r' from raw strings.
+            if (word.startswith("u'") or
+                    word.startswith('u"') or
+                    word.startswith("r'") or
+                    word.startswith('r"')) and len(word) > 2:
+                word = word[2:]
+
+            # If it is a known word, then continue.
+            if self.spelling_dict.check(word):
+                continue
+
+            # Store word to private dict or raise a message.
+            if self.config.spelling_store_unknown_words:
+                if word not in self.unknown_words:
+                    self.private_dict_file.write("%s\n" % word)
+                    self.unknown_words.add(word)
+            else:
+                # Present up to 4 suggestions.
+                # TODO: add support for customising this.
+                suggestions = self.spelling_dict.suggest(word)[:4]
+
+                m = re.search(r"(\W|^)(%s)(\W|$)" % word, line.lower())
+                if m:
+                    # Start position of second group in regex.
+                    col = m.regs[2][0]
+                else:
+                    col = line.lower().index(word)
+                indicator = (" " * col) + ("^" * len(word))
+
+                self.add_message(msgid, line=line_num,
+                                 args=(orig_word, line,
+                                       indicator,
+                                       "' or '".join(suggestions)))
+
+    def process_tokens(self, tokens):
+        if not self.initialized:
+            return
+
+        # Process tokens and look for comments.
+        for (tok_type, token, (start_row, _), _, _) in tokens:
+            if tok_type == tokenize.COMMENT:
+                self._check_spelling('wrong-spelling-in-comment',
+                                     token, start_row)
+
+    @check_messages('wrong-spelling-in-docstring')
+    def visit_module(self, node):
+        if not self.initialized:
+            return
+        self._check_docstring(node)
+
+    @check_messages('wrong-spelling-in-docstring')
+    def visit_class(self, node):
+        if not self.initialized:
+            return
+        self._check_docstring(node)
+
+    @check_messages('wrong-spelling-in-docstring')
+    def visit_function(self, node):
+        if not self.initialized:
+            return
+        self._check_docstring(node)
+
+    def _check_docstring(self, node):
+        """check the node has any spelling errors"""
+        docstring = node.doc
+        if not docstring:
+            return
+
+        start_line = node.lineno + 1
+
+        # Go through lines of docstring
+        for idx, line in enumerate(docstring.splitlines()):
+            self._check_spelling('wrong-spelling-in-docstring',
+                                 line, start_line + idx)
+
+
+def register(linter):
+    """required method to auto register this checker """
+    linter.register_checker(SpellingChecker(linter))