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PyMapping_SetItemString() returns int, not an object.
author Guido van Rossum <guido@python.org>
date Fri, 16 Oct 1998 17:43:53 +0000
parents 0329d419e506
children 3886165dba42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Utilities dealing with code objects.
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2
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3 Inspired by similar code by Jeff Epler and Fredrik Lundh.
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4 """
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5
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6 import sys
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7 import string
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8 import traceback
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9
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10 def compile_command(source, filename="<input>", symbol="single"):
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11 r"""Compile a command and determine whether it is incomplete.
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12
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13 Arguments:
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14
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15 source -- the source string; may contain \n characters
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16 filename -- optional filename from which source was read; default "<input>"
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17 symbol -- optional grammar start symbol; "single" (default) or "eval"
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18
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19 Return value / exceptions raised:
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20
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21 - Return a code object if the command is complete and valid
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22 - Return None if the command is incomplete
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23 - Raise SyntaxError or OverflowError if the command is a syntax error
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24 (OverflowError if the error is in a numeric constant)
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25
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26 Approach:
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27
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28 First, check if the source consists entirely of blank lines and
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29 comments; if so, replace it with 'pass', because the built-in
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30 parser doesn't always do the right thing for these.
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31
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32 Compile three times: as is, with \n, and with \n\n appended. If
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33 it compiles as is, it's complete. If it compiles with one \n
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34 appended, we expect more. If it doesn't compile either way, we
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35 compare the error we get when compiling with \n or \n\n appended.
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36 If the errors are the same, the code is broken. But if the errors
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37 are different, we expect more. Not intuitive; not even guaranteed
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38 to hold in future releases; but this matches the compiler's
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39 behavior from Python 1.4 through 1.5.2, at least.
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40
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41 Caveat:
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42
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43 It is possible (but not likely) that the parser stops parsing
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44 with a successful outcome before reaching the end of the source;
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45 in this case, trailing symbols may be ignored instead of causing an
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46 error. For example, a backslash followed by two newlines may be
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47 followed by arbitrary garbage. This will be fixed once the API
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48 for the parser is better.
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49
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50 """
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51
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52 # Check for source consisting of only blank lines and comments
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53 for line in string.split(source, "\n"):
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54 line = string.strip(line)
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55 if line and line[0] != '#':
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56 break # Leave it alone
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57 else:
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58 source = "pass" # Replace it with a 'pass' statement
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59
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60 err = err1 = err2 = None
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61 code = code1 = code2 = None
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62
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63 try:
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64 code = compile(source, filename, symbol)
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65 except SyntaxError, err:
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66 pass
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67
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68 try:
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69 code1 = compile(source + "\n", filename, symbol)
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70 except SyntaxError, err1:
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71 pass
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72
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73 try:
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74 code2 = compile(source + "\n\n", filename, symbol)
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75 except SyntaxError, err2:
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76 pass
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77
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78 if code:
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79 return code
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80 try:
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81 e1 = err1.__dict__
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82 except AttributeError:
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83 e1 = err1
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84 try:
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85 e2 = err2.__dict__
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86 except AttributeError:
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87 e2 = err2
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88 if not code1 and e1 == e2:
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89 raise SyntaxError, err1
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90
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91
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92 class InteractiveInterpreter:
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93 """Base class for InteractiveConsole.
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94
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95 This class deals with parsing and interpreter state (the user's
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96 namespace); it doesn't deal with input buffering or prompting or
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97 input file naming (the filename is always passed in explicitly).
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98
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99 """
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100
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101 def __init__(self, locals=None):
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102 """Constructor.
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103
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104 The optional 'locals' argument specifies the dictionary in
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105 which code will be executed; it defaults to a newly created
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106 dictionary with key "__name__" set to "__console__" and key
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107 "__doc__" set to None.
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108
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109 """
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110 if locals is None:
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111 locals = {"__name__": "__console__", "__doc__": None}
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112 self.locals = locals
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113
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114 def runsource(self, source, filename="<input>", symbol="single"):
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115 """Compile and run some source in the interpreter.
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116
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117 Arguments are as for compile_command().
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118
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119 One several things can happen:
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120
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121 1) The input is incorrect; compile_command() raised an
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122 exception (SyntaxError or OverflowError). A syntax traceback
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123 will be printed by calling the showsyntaxerror() method.
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124
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125 2) The input is incomplete, and more input is required;
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126 compile_command() returned None. Nothing happens.
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127
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128 3) The input is complete; compile_command() returned a code
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129 object. The code is executed by calling self.runcode() (which
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130 also handles run-time exceptions, except for SystemExit).
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131
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132 The return value is 1 in case 2, 0 in the other cases (unless
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133 an exception is raised). The return value can be used to
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134 decide whether to use sys.ps1 or sys.ps2 to prompt the next
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135 line.
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136
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137 """
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138 try:
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139 code = compile_command(source, filename, symbol)
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140 except (OverflowError, SyntaxError):
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141 # Case 1
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142 self.showsyntaxerror(filename)
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143 return 0
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144
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145 if code is None:
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146 # Case 2
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147 return 1
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148
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149 # Case 3
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150 self.runcode(code)
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151 return 0
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152
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153 def runcode(self, code):
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154 """Execute a code object.
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155
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156 When an exception occurs, self.showtraceback() is called to
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157 display a traceback. All exceptions are caught except
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158 SystemExit, which is reraised.
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159
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160 A note about KeyboardInterrupt: this exception may occur
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161 elsewhere in this code, and may not always be caught. The
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162 caller should be prepared to deal with it.
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163
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164 """
9137
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165 try:
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166 exec code in self.locals
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167 except SystemExit:
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168 raise
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169 except:
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170 self.showtraceback()
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171
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172 def showsyntaxerror(self, filename=None):
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173 """Display the syntax error that just occurred.
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174
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175 This doesn't display a stack trace because there isn't one.
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176
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177 If a filename is given, it is stuffed in the exception instead
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178 of what was there before (because Python's parser always uses
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179 "<string>" when reading from a string).
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180
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181 The output is written by self.write(), below.
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182
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183 """
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184 type, value, sys.last_traceback = sys.exc_info()
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185 sys.last_type = type
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186 sys.last_value = value
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187 if filename and type is SyntaxError:
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188 # Work hard to stuff the correct filename in the exception
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189 try:
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190 msg, (dummy_filename, lineno, offset, line) = value
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191 except:
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192 # Not the format we expect; leave it alone
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193 pass
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194 else:
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195 # Stuff in the right filename
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196 try:
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197 # Assume SyntaxError is a class exception
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198 value = SyntaxError(msg, (filename, lineno, offset, line))
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199 except:
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200 # If that failed, assume SyntaxError is a string
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201 value = msg, (filename, lineno, offset, line)
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202 list = traceback.format_exception_only(type, value)
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203 map(self.write, list)
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204
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205 def showtraceback(self):
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206 """Display the exception that just occurred.
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207
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208 We remove the first stack item because it is our own code.
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209
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210 The output is written by self.write(), below.
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211
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212 """
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213 try:
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214 type, value, tb = sys.exc_info()
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215 sys.last_type = type
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216 sys.last_value = value
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217 sys.last_traceback = tb
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218 tblist = traceback.extract_tb(tb)
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219 del tblist[:1]
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220 list = traceback.format_list(tblist)
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221 if list:
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222 list.insert(0, "Traceback (innermost last):\n")
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223 list[len(list):] = traceback.format_exception_only(type, value)
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224 finally:
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225 tblist = tb = None
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226 map(self.write, list)
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227
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228 def write(self, data):
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229 """Write a string.
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230
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231 The base implementation writes to sys.stderr; a subclass may
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232 replace this with a different implementation.
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233
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234 """
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235 sys.stderr.write(data)
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236
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237
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238 class InteractiveConsole(InteractiveInterpreter):
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239 """Closely emulate the behavior of the interactive Python interpreter.
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240
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241 This class builds on InteractiveInterpreter and adds prompting
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242 using the familiar sys.ps1 and sys.ps2, and input buffering.
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243
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244 """
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245
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246 def __init__(self, locals=None, filename="<console>"):
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247 """Constructor.
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248
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249 The optional locals argument will be passed to the
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250 InteractiveInterpreter base class.
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251
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252 The optional filename argument should specify the (file)name
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253 of the input stream; it will show up in tracebacks.
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254
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255 """
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256 InteractiveInterpreter.__init__(self, locals)
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257 self.filename = filename
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258 self.resetbuffer()
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259
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260 def resetbuffer(self):
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261 """Reset the input buffer."""
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262 self.buffer = []
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263
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264 def interact(self, banner=None):
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265 """Closely emulate the interactive Python console.
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266
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267 The optional banner argument specify the banner to print
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268 before the first interaction; by default it prints a banner
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269 similar to the one printed by the real Python interpreter,
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270 followed by the current class name in parentheses (so as not
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271 to confuse this with the real interpreter -- since it's so
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272 close!).
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273
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274 """
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275 try:
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276 sys.ps1
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277 except AttributeError:
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278 sys.ps1 = ">>> "
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279 try:
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280 sys.ps2
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281 except AttributeError:
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282 sys.ps2 = "... "
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283 if banner is None:
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284 self.write("Python %s on %s\n%s\n(%s)\n" %
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285 (sys.version, sys.platform, sys.copyright,
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286 self.__class__.__name__))
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287 else:
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288 self.write("%s\n" % str(banner))
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289 more = 0
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290 while 1:
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291 try:
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292 if more:
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293 prompt = sys.ps2
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294 else:
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295 prompt = sys.ps1
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296 try:
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297 line = self.raw_input(prompt)
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298 except EOFError:
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299 self.write("\n")
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300 break
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301 else:
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302 more = self.push(line)
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303 except KeyboardInterrupt:
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304 self.write("\nKeyboardInterrupt\n")
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305 self.resetbuffer()
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306 more = 0
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307
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308 def push(self, line):
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309 """Push a line to the interpreter.
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310
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311 The line should not have a trailing newline; it may have
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312 internal newlines. The line is appended to a buffer and the
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313 interpreter's runsource() method is called with the
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314 concatenated contents of the buffer as source. If this
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315 indicates that the command was executed or invalid, the buffer
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316 is reset; otherwise, the command is incomplete, and the buffer
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317 is left as it was after the line was appended. The return
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318 value is 1 if more input is required, 0 if the line was dealt
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319 with in some way (this is the same as runsource()).
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320
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321 """
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322 self.buffer.append(line)
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323 source = string.join(self.buffer, "\n")
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324 more = self.runsource(source, self.filename)
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325 if not more:
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326 self.resetbuffer()
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327 return more
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328
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329 def raw_input(self, prompt=""):
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330 """Write a prompt and read a line.
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331
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332 The returned line does not include the trailing newline.
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333 When the user enters the EOF key sequence, EOFError is raised.
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334
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335 The base implementation uses the built-in function
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336 raw_input(); a subclass may replace this with a different
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337 implementation.
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338
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339 """
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340 return raw_input(prompt)
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341
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342
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343 def interact(banner=None, readfunc=None, locals=None):
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344 """Closely emulate the interactive Python interpreter.
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345
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346 This is a backwards compatible interface to the InteractiveConsole
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347 class. When readfunc is not specified, it attempts to import the
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348 readline module to enable GNU readline if it is available.
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349
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350 Arguments (all optional, all default to None):
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351
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352 banner -- passed to InteractiveConsole.interact()
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353 readfunc -- if not None, replaces InteractiveConsole.raw_input()
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354 locals -- passed to InteractiveInterpreter.__init__()
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355
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356 """
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357 console = InteractiveConsole(locals)
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358 if readfunc is not None:
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359 console.raw_input = readfunc
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360 else:
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361 try:
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362 import readline
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363 except:
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364 pass
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365 console.interact(banner)
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366
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367
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368 if __name__ == '__main__':
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369 interact()