Mercurial > cpython-lru_cache-weakref

annotate Demo/parser/example.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents c18d52e06238
children b52864c5e9c9
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1 """Simple code to extract class & function docstrings from a module.
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2
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3 This code is used as an example in the library reference manual in the
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4 section on using the parser module. Refer to the manual for a thorough
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5 discussion of the operation of this code.
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6 """
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7
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8 import symbol
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9 import token
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10 import types
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11
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12
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13 def get_docs(fileName):
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14 """Retrieve information from the parse tree of a source file.
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15
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16 fileName
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17 Name of the file to read Python source code from.
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18 """
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19 source = open(fileName).read()
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20 import os
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21 basename = os.path.basename(os.path.splitext(fileName)[0])
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22 import parser
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23 ast = parser.suite(source)
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24 tup = parser.ast2tuple(ast)
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25 return ModuleInfo(tup, basename)
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26
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27
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28 class SuiteInfoBase:
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29 _docstring = ''
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30 _name = ''
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31
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32 def __init__(self, tree = None):
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33 self._class_info = {}
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34 self._function_info = {}
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35 if tree:
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36 self._extract_info(tree)
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37
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38 def _extract_info(self, tree):
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39 # extract docstring
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40 if len(tree) == 2:
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41 found, vars = match(DOCSTRING_STMT_PATTERN[1], tree[1])
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42 else:
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43 found, vars = match(DOCSTRING_STMT_PATTERN, tree[3])
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44 if found:
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45 self._docstring = eval(vars['docstring'])
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46 # discover inner definitions
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47 for node in tree[1:]:
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48 found, vars = match(COMPOUND_STMT_PATTERN, node)
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49 if found:
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50 cstmt = vars['compound']
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51 if cstmt[0] == symbol.funcdef:
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52 name = cstmt[2][1]
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53 self._function_info[name] = FunctionInfo(cstmt)
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54 elif cstmt[0] == symbol.classdef:
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55 name = cstmt[2][1]
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56 self._class_info[name] = ClassInfo(cstmt)
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57
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58 def get_docstring(self):
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59 return self._docstring
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60
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61 def get_name(self):
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62 return self._name
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63
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64 def get_class_names(self):
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65 return self._class_info.keys()
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66
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67 def get_class_info(self, name):
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68 return self._class_info[name]
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69
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70 def __getitem__(self, name):
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71 try:
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72 return self._class_info[name]
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73 except KeyError:
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74 return self._function_info[name]
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75
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76
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77 class SuiteFuncInfo:
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78 # Mixin class providing access to function names and info.
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79
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80 def get_function_names(self):
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81 return self._function_info.keys()
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82
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83 def get_function_info(self, name):
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84 return self._function_info[name]
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85
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86
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87 class FunctionInfo(SuiteInfoBase, SuiteFuncInfo):
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88 def __init__(self, tree = None):
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89 self._name = tree[2][1]
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90 SuiteInfoBase.__init__(self, tree and tree[-1] or None)
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91
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92
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93 class ClassInfo(SuiteInfoBase):
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94 def __init__(self, tree = None):
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95 self._name = tree[2][1]
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96 SuiteInfoBase.__init__(self, tree and tree[-1] or None)
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97
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98 def get_method_names(self):
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99 return self._function_info.keys()
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100
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101 def get_method_info(self, name):
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102 return self._function_info[name]
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103
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104
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105 class ModuleInfo(SuiteInfoBase, SuiteFuncInfo):
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106 def __init__(self, tree = None, name = "<string>"):
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107 self._name = name
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108 SuiteInfoBase.__init__(self, tree)
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109 if tree:
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110 found, vars = match(DOCSTRING_STMT_PATTERN, tree[1])
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111 if found:
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112 self._docstring = vars["docstring"]
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113
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114
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115 from types import ListType, TupleType
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116
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117 def match(pattern, data, vars=None):
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118 """Match `data' to `pattern', with variable extraction.
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119
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120 pattern
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121 Pattern to match against, possibly containing variables.
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122
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123 data
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124 Data to be checked and against which variables are extracted.
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125
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126 vars
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127 Dictionary of variables which have already been found. If not
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128 provided, an empty dictionary is created.
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129
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130 The `pattern' value may contain variables of the form ['varname'] which
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131 are allowed to match anything. The value that is matched is returned as
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132 part of a dictionary which maps 'varname' to the matched value. 'varname'
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133 is not required to be a string object, but using strings makes patterns
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134 and the code which uses them more readable.
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135
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136 This function returns two values: a boolean indicating whether a match
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137 was found and a dictionary mapping variable names to their associated
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138 values.
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139 """
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140 if vars is None:
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141 vars = {}
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142 if type(pattern) is ListType: # 'variables' are ['varname']
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143 vars[pattern[0]] = data
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144 return 1, vars
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145 if type(pattern) is not TupleType:
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146 return (pattern == data), vars
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147 if len(data) != len(pattern):
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148 return 0, vars
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149 for pattern, data in map(None, pattern, data):
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150 same, vars = match(pattern, data, vars)
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151 if not same:
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152 break
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153 return same, vars
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154
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155
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156 # This pattern identifies compound statements, allowing them to be readily
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157 # differentiated from simple statements.
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158 #
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159 COMPOUND_STMT_PATTERN = (
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160 symbol.stmt,
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161 (symbol.compound_stmt, ['compound'])
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162 )
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163
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164
4088
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165 # This pattern will match a 'stmt' node which *might* represent a docstring;
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166 # docstrings require that the statement which provides the docstring be the
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167 # first statement in the class or function, which this pattern does not check.
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168 #
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169 DOCSTRING_STMT_PATTERN = (
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170 symbol.stmt,
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171 (symbol.simple_stmt,
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172 (symbol.small_stmt,
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173 (symbol.expr_stmt,
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174 (symbol.testlist,
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175 (symbol.test,
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176 (symbol.and_test,
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177 (symbol.not_test,
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178 (symbol.comparison,
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179 (symbol.expr,
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180 (symbol.xor_expr,
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181 (symbol.and_expr,
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182 (symbol.shift_expr,
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183 (symbol.arith_expr,
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184 (symbol.term,
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185 (symbol.factor,
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186 (symbol.power,
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187 (symbol.atom,
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188 (token.STRING, ['docstring'])
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189 )))))))))))))))),
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190 (token.NEWLINE, '')
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191 ))
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192
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193 #
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194 # end of file