Run analysis.

        The basic idea is to recursively find all script files in specific 
        programming language, and analyze each file then sum it up.

def run(self):
        """Run analysis.

        The basic idea is to recursively find all script files in specific 
        programming language, and analyze each file then sum it up.
        """
        n_target_file, n_other_file = 0, 0

        code, comment, docstr, purecode = 0, 0, 0, 0

        fc = FileCollection.from_path_except(self.workspace, self.ignore)

        fc_yes, fc_no = fc.select(self.filter, keepboth=True)
        n_other_file += len(fc_no)

        for abspath in fc_yes:
            try:
                with open(abspath, "rb") as f:
                    code_text = f.read().decode("utf-8")
                    code_, comment_, docstr_, purecode_ = self.analyzer(
                        code_text)
                    code += code_
                    comment += comment_
                    docstr += docstr_
                    purecode += purecode_
                    n_target_file += 1
            except Exception as e:
                n_other_file += 1

        lines = list()
        lines.append("Code statistic result for '%s'" % self.workspace)
        lines.append("  %r %r files, %r other files." %
                     (n_target_file, self.language, n_other_file))
        lines.append("    code line: %s" % code)
        lines.append("    comment line: %s" % comment)
        lines.append("    docstr line: %s" % docstr)
        lines.append("    purecode line: %s" % purecode)
        message = "\n".join(lines)

        print(message)
        return message