Add pylint to depot_tools.

third_party/pylint/checkers/raw_metrics.py

Index: third_party/pylint/checkers/raw_metrics.py
diff --git a/third_party/pylint/checkers/raw_metrics.py b/third_party/pylint/checkers/raw_metrics.py
new file mode 100644
index 0000000000000000000000000000000000000000..872ca7bcc567989db6e38841713906fbaa779f60
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+++ b/third_party/pylint/checkers/raw_metrics.py
@@ -0,0 +1,125 @@
+# 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.,
+# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+""" Copyright (c) 2003-2010 LOGILAB S.A. (Paris, FRANCE).
+ http://www.logilab.fr/ -- mailto:contact@logilab.fr
+
+Raw metrics checker
+"""
+
+import tokenize
+
+# pylint now requires pylint >= 2.2, so this is no longer necessary
+#if not hasattr(tokenize, 'NL'):
+#    raise ValueError("tokenize.NL doesn't exist -- tokenize module too old")
+
+from logilab.common.ureports import Table
+
+from pylint.interfaces import IRawChecker
+from pylint.checkers import BaseRawChecker, EmptyReport
+from pylint.reporters import diff_string
+
+def report_raw_stats(sect, stats, old_stats):
+    """calculate percentage of code / doc / comment / empty
+    """
+    total_lines = stats['total_lines']
+    if not total_lines:
+        raise EmptyReport()
+    sect.description = '%s lines have been analyzed' % total_lines
+    lines = ('type', 'number', '%', 'previous', 'difference')
+    for node_type in ('code', 'docstring', 'comment', 'empty'):
+        key = node_type + '_lines'
+        total = stats[key]
+        percent = float(total * 100) / total_lines
+        old = old_stats.get(key, None)
+        if old is not None:
+            diff_str = diff_string(old, total)
+        else:
+            old, diff_str = 'NC', 'NC'
+        lines += (node_type, str(total), '%.2f' % percent,
+                  str(old), diff_str)
+    sect.append(Table(children=lines, cols=5, rheaders=1))
+
+
+class RawMetricsChecker(BaseRawChecker):
+    """does not check anything but gives some raw metrics :                    
+    * total number of lines                                                    
+    * total number of code lines                                               
+    * total number of docstring lines                                          
+    * total number of comments lines                                           
+    * total number of empty lines                                              
+    """
+
+    __implements__ = (IRawChecker,)
+
+    # configuration section name
+    name = 'metrics'
+    # configuration options
+    options = ( )
+    # messages
+    msgs = {}
+    # reports
+    reports = ( ('RP0701', 'Raw metrics', report_raw_stats), )
+
+    def __init__(self, linter):
+        BaseRawChecker.__init__(self, linter)
+        self.stats = None
+
+    def open(self):
+        """init statistics"""
+        self.stats = self.linter.add_stats(total_lines=0, code_lines=0,
+                                           empty_lines=0, docstring_lines=0,
+                                           comment_lines=0)
+
+    def process_tokens(self, tokens):
+        """update stats"""
+        i = 0
+        tokens = list(tokens)
+        while i < len(tokens):
+            i, lines_number, line_type = get_type(tokens, i)
+            self.stats['total_lines'] += lines_number
+            self.stats[line_type] += lines_number
+
+
+JUNK = (tokenize.NL, tokenize.INDENT, tokenize.NEWLINE, tokenize.ENDMARKER)
+
+def get_type(tokens, start_index):
+    """return the line type : docstring, comment, code, empty"""
+    i = start_index
+    tok_type = tokens[i][0]
+    start = tokens[i][2]
+    pos = start
+    line_type = None
+    while i < len(tokens) and tokens[i][2][0] == start[0]:
+        tok_type = tokens[i][0]
+        pos = tokens[i][3]
+        if line_type is None:
+            if tok_type == tokenize.STRING:
+                line_type = 'docstring_lines'
+            elif tok_type == tokenize.COMMENT:
+                line_type = 'comment_lines'
+            elif tok_type in JUNK:
+                pass
+            else:
+                line_type = 'code_lines'
+        i += 1
+    if line_type is None:
+        line_type = 'empty_lines'
+    elif i < len(tokens) and tok_type == tokenize.NEWLINE:
+        i += 1
+    return i, pos[0] - start[0] + 1, line_type
+
+
+def register(linter):
+    """ required method to auto register this checker """
+    linter.register_checker(RawMetricsChecker(linter))
+