diff -r 66be66ec3afc -r 14f3ca3dcef6 Plugins/CheckerPlugins/CodeStyleChecker/McCabeChecker.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/CheckerPlugins/CodeStyleChecker/McCabeChecker.py Wed Sep 02 20:16:28 2015 +0200
@@ -0,0 +1,124 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2015 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a checker for code complexity.
+"""
+
+import sys
+import ast
+
+from mccabe import PathGraphingAstVisitor
+
+
+class McCabeChecker(object):
+ """
+ Class implementing a checker for code complexity iaw. McCabe.
+ """
+ Codes = [
+ "C101",
+
+ "C901",
+ ]
+
+ def __init__(self, source, filename, select, ignore, maxComplexity=10):
+ """
+ Constructor
+
+ @param source source code to be checked
+ @type list of str
+ @param filename name of the source file
+ @type str
+ @param select list of selected codes
+ @type list of str
+ @param ignore list of codes to be ignored
+ @type list of str
+ @param maxComplexity maximum allowed complexity value
+ @type int
+ """
+ self.__filename = filename
+ self.__source = source[:]
+ self.__maxComplexity = maxComplexity
+ self.__select = tuple(select)
+ self.__ignore = ('',) if select else tuple(ignore)
+
+ # statistics counters
+ self.counters = {}
+
+ # collection of detected errors
+ self.errors = []
+
+ def __error(self, lineNumber, offset, code, *args):
+ """
+ Private method to record an issue.
+
+ @param lineNumber line number of the issue
+ @type int
+ @param offset position within line of the issue
+ @type int
+ @param code message code
+ @type str
+ @param args arguments for the message
+ @type list
+ """
+ if code in self.counters:
+ self.counters[code] += 1
+ else:
+ self.counters[code] = 1
+
+ if code:
+ # record the issue with one based line number
+ self.errors.append(
+ (self.__filename, lineNumber, offset, (code, args)))
+
+ def __reportInvalidSyntax(self):
+ """
+ Private method to report a syntax error.
+ """
+ exc_type, exc = sys.exc_info()[:2]
+ if len(exc.args) > 1:
+ offset = exc.args[1]
+ if len(offset) > 2:
+ offset = offset[1:3]
+ else:
+ offset = (1, 0)
+ self.__error(offset[0] - 1, offset[1] or 0,
+ 'C901', exc_type.__name__, exc.args[0])
+
+ def __ignoreCode(self, code):
+ """
+ Private method to check if the error code should be ignored.
+
+ @param code message code to check for (string)
+ @return flag indicating to ignore the given code (boolean)
+ """
+ return (code.startswith(self.__ignore) and
+ not code.startswith(self.__select))
+
+ def run(self):
+ """
+ Public method to check the given source for code complexity.
+ """
+ if not self.__filename or not self.__source:
+ # don't do anything, if essential data is missing
+ return
+
+ if self.__ignoreCode("C101"):
+ # don't do anything, if this should be ignored
+ return
+
+ try:
+ tree = compile(''.join(self.__source), self.__filename, 'exec',
+ ast.PyCF_ONLY_AST)
+ except (SyntaxError, TypeError):
+ self.__reportInvalidSyntax()
+ return
+
+ visitor = PathGraphingAstVisitor()
+ visitor.preorder(tree, visitor)
+ for graph in visitor.graphs.values():
+ if graph.complexity() > self.__maxComplexity:
+ self.__error(graph.lineno, 0, "C101",
+ graph.entity, graph.complexity())
