DataViews/CodeMetrics.py

Sat, 07 Apr 2012 21:19:24 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 07 Apr 2012 21:19:24 +0200
changeset 1770
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parent 1509
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child 2302
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permissions
-rw-r--r--

Added a tool to take screenshots (fullscreen or rectangular selection).

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2003 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 #
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7 # Code mainly borrowed from the Pythius package which is
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8 # Copyright (c) 2001 by J├╝rgen Hermann <jh@web.de>
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9 #
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10
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11 """
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12 Module implementing a simple Python code metrics analyzer.
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13
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14 @exception ValueError the tokenize module is too old
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15 """
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16
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17 import os
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18 import io
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19 import keyword
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20 import token
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21 import tokenize
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22
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23 import Utilities
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24
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25 KEYWORD = token.NT_OFFSET + 1
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26 COMMENT = tokenize.COMMENT
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27 INDENT = token.INDENT
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28 DEDENT = token.DEDENT
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29 NEWLINE = token.NEWLINE
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30 EMPTY = tokenize.NL
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31
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32
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33 class Token(object):
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34 """
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35 Class to store the token related infos.
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36 """
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37 def __init__(self, **kw):
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38 """
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39 Constructor
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40
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41 @param **kw list of key, value pairs
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42 """
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43 self.__dict__.update(kw)
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44
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45
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46 class Parser(object):
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47 """
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48 Class used to parse the source code of a Python file.
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49 """
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50 def parse(self, text):
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51 """
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52 Public method used to parse the source code.
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53
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54 @param text the source code as read from a Python source file
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55 """
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56 self.tokenlist = []
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57
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58 # convert eols
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59 text = Utilities.convertLineEnds(text, os.linesep)
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60
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61 if not text.endswith(os.linesep):
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62 text = "{0}{1}".format(text, os.linesep)
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63
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64 self.lines = text.count(os.linesep)
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65
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66 source = io.BytesIO(text.encode("utf-8"))
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67 try:
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68 gen = tokenize.tokenize(source.readline)
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69 for toktype, toktext, start, end, line in gen:
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70 (srow, scol) = start
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71 (erow, ecol) = end
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72 if toktype in [token.NEWLINE, tokenize.NL]:
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73 self.__addToken(toktype, os.linesep, srow, scol, line)
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74 elif toktype in [token.INDENT, token.DEDENT]:
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75 self.__addToken(toktype, '', srow, scol, line)
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76 elif toktype == token.NAME and keyword.iskeyword(toktext):
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77 toktype = KEYWORD
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78 self.__addToken(toktype, toktext, srow, scol, line)
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79 else:
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80 self.__addToken(toktype, toktext, srow, scol, line)
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81 except tokenize.TokenError as msg:
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82 print("Token Error: {0}".format(str(msg)))
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83 return
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84
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85 return
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86
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87 def __addToken(self, toktype, toktext, srow, scol, line):
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88 """
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89 Private method used to add a token to our list of tokens.
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90
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91 @param toktype the type of the token (int)
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92 @param toktext the text of the token (string)
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93 @param srow starting row of the token (int)
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94 @param scol starting column of the token (int)
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95 @param line logical line the token was found (string)
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96 """
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97 self.tokenlist.append(Token(type=toktype, text=toktext, row=srow,
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98 col=scol, line=line))
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99
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100 spacer = ' '
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101
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102
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103 class SourceStat(object):
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104 """
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105 Class used to calculate and store the source code statistics.
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106 """
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107 def __init__(self):
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108 """
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109 Constructor
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110 """
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111 self.identifiers = [] # list of identifiers in order of appearance
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112 self.active = [('TOTAL ', -1, 0)] # stack of active identifiers and indent levels
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113 self.counters = {} # counters per identifier
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114 self.indent_level = 0
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115
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116 def indent(self, tok):
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117 """
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118 Public method used to increment the indentation level.
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119
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120 @param tok a token (Token, ignored)
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121 """
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122 self.indent_level += 1
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123
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124 def dedent(self, tok):
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125 """
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126 Public method used to decrement the indentation level.
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127
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128 @param tok the token to be processed (Token)
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129 """
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130 self.indent_level -= 1
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131 if self.indent_level < 0:
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132 raise ValueError("INTERNAL ERROR: Negative indent level")
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133
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134 # remove identifiers of a higher indentation
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diff changeset
135 while self.active and self.active[-1][1] >= self.indent_level:
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136 counters = self.counters.setdefault(self.active[-1][0], {})
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137 counters['start'] = self.active[-1][2]
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138 counters['end'] = tok.row - 1
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139 counters['lines'] = tok.row - self.active[-1][2]
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140 del self.active[-1]
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141
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142 def push(self, identifier, row):
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143 """
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144 Public method used to store an identifier.
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145
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146 @param identifier the identifier to be remembered (string)
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147 @param row the row, the identifier is defined in (int)
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148 """
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149 if len(self.active) > 1 and self.indent_level > self.active[-1][1]:
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150 qualified = self.active[-1][0] + '.' + identifier
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151 else:
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152 qualified = identifier
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153 self.active.append((qualified, self.indent_level, row))
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154 self.identifiers.append(qualified)
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155
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156 def inc(self, key, value=1):
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157 """
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158 Public method used to increment the value of a key.
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159
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160 @param key the key to be incremented
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161 @param value the increment (int)
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162 """
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163 for id, level, row in self.active:
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164 counters = self.counters.setdefault(id, {})
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165 counters[key] = counters.setdefault(key, 0) + value
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166
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167 def dump(self):
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168 """
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169 Public method used to format and print the collected statistics.
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170 """
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171 label_len = 79 - len(spacer) - 6 * 6
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172 print(spacer + "FUNCTION / CLASS".ljust(label_len) + \
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173 " START END LINES NLOC COMM EMPTY")
0
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174 for id in self.identifiers + ['TOTAL ']:
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175 label = id
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176 counters = self.counters.get(id, {})
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177 msg = spacer + label.ljust(label_len)
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178
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179 for key in ('start', 'end', 'lines', 'nloc', 'comments', 'empty'):
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180 if counters.get(key, 0):
406
eacf81fad150 Started converting the string formatting stuff.
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diff changeset
181 msg += " {0:d}".format(counters[key])
0
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182 else:
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183 msg += " " * 6
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184
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185 print(msg)
0
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186
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187 def getCounter(self, id, key):
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188 """
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189 Public method used to get a specific counter value.
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190
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191 @param id id of the counter (string)
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192 @param key key of the value to be retrieved (string)
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193 @return the value of the requested counter (int)
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194 """
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195 return self.counters.get(id, {}).get(key, 0)
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196
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197
0
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198 def summarize(total, key, value):
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199 """
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200 Module function used to collect overall statistics.
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201
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202 @param total the dictionary for the overall statistics
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203 @param key the key to be summarize
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204 @param value the value to be added to the overall statistics
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205 @return the value added to the overall statistics
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206 """
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207 total[key] = total.setdefault(key, 0) + value
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208 return value
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209
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210
0
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diff changeset
211 def analyze(filename, total):
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212 """
0
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diff changeset
213 Module function used analyze the source of a Python file.
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214
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diff changeset
215 @param filename name of the Python file to be analyzed (string)
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216 @param total dictionary receiving the overall code statistics
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parents:
diff changeset
217 @return a statistics object with the collected code statistics (SourceStat)
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218 """
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parents:
diff changeset
219 try:
45
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diff changeset
220 text = Utilities.readEncodedFile(filename)[0]
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diff changeset
221 except (UnicodeError, IOError):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents: 13
diff changeset
222 return SourceStat()
0
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223
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parents:
diff changeset
224 parser = Parser()
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parents:
diff changeset
225 parser.parse(text)
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226
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diff changeset
227 stats = SourceStat()
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parents:
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228 stats.inc('lines', parser.lines)
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parents:
diff changeset
229 for idx in range(len(parser.tokenlist)):
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parents:
diff changeset
230 tok = parser.tokenlist[idx]
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parents:
diff changeset
231
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parents:
diff changeset
232 # counting
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parents:
diff changeset
233 if tok.type == NEWLINE:
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parents:
diff changeset
234 stats.inc('nloc')
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diff changeset
235 elif tok.type == COMMENT:
0
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parents:
diff changeset
236 stats.inc('comments')
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diff changeset
237 elif tok.type == EMPTY:
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238 if parser.tokenlist[idx - 1].type == token.OP:
0
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diff changeset
239 stats.inc('nloc')
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diff changeset
240 else:
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diff changeset
241 stats.inc('empty')
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242 elif tok.type == INDENT:
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diff changeset
243 stats.indent(tok)
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244 elif tok.type == DEDENT:
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diff changeset
245 stats.dedent(tok)
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diff changeset
246 elif tok.type == KEYWORD:
0
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diff changeset
247 if tok.text in ("class", "def"):
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248 stats.push(parser.tokenlist[idx + 1].text, tok.row)
0
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249
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250 # collect overall statistics
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diff changeset
251 summarize(total, 'lines', parser.lines)
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parents:
diff changeset
252 summarize(total, 'bytes', len(text))
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parents:
diff changeset
253 summarize(total, 'comments', stats.getCounter('TOTAL ', 'comments'))
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parents:
diff changeset
254 summarize(total, 'empty lines', stats.getCounter('TOTAL ', 'empty'))
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parents:
diff changeset
255 summarize(total, 'non-commentary lines', stats.getCounter('TOTAL ', 'nloc'))
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diff changeset
256
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diff changeset
257 return stats
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258
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259
0
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diff changeset
260 def main():
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parents:
diff changeset
261 """
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parents:
diff changeset
262 Modules main function used when called as a script.
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diff changeset
263
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diff changeset
264 This function simply loops over all files given on the commandline
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265 and collects the individual and overall source code statistics.
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266 """
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267 import sys
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268
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269 files = sys.argv[1:]
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270
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271 if not files:
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272 sys.exit(1)
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273
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274 total = {}
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275
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276 summarize(total, 'files', len(files))
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277 for file in files:
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278 print(file)
0
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279 stats = analyze(file, total)
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280 stats.dump()
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281
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282 print("\nSummary")
0
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283 for key in ['files', 'lines', 'bytes', 'comments',
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284 'empty lines', 'non-commentary lines']:
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285 print(key.ljust(20) + "{0:d}".format(total[key]))
0
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286
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287 sys.exit(0)
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288
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289 if __name__ == "__main__":
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290 main()

eric ide

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