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annotate Lib/code.py @ 7097:00a85ab0337f legacy-trunk

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Seems I've found a way to fix this.
author Guido van Rossum <guido@python.org>
date Wed, 14 Jan 1998 15:40:30 +0000
parents 644484e1a37b
children fb4b4d069cc7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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b9063f6f811c Checking in new module code.py -- utilities dealing with code objects.
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1 """Utilities dealing with code objects."""
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2
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3 def compile_command(source, filename="<input>", symbol="single"):
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4 r"""Compile a command and determine whether it is incomplete.
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5
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6 Arguments:
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7
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8 source -- the source string; may contain \n characters
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9 filename -- optional filename from which source was read; default "<input>"
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10 symbol -- optional grammar start symbol; "single" (default) or "eval"
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11
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12 Return value / exception raised:
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13
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14 - Return a code object if the command is complete and valid
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15 - Return None if the command is incomplete
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16 - Raise SyntaxError if the command is a syntax error
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17
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18 Approach:
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19
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20 Compile three times: as is, with \n, and with \n\n appended. If
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21 it compiles as is, it's complete. If it compiles with one \n
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22 appended, we expect more. If it doesn't compile either way, we
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23 compare the error we get when compiling with \n or \n\n appended.
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24 If the errors are the same, the code is broken. But if the errors
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25 are different, we expect more. Not intuitive; not even guaranteed
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26 to hold in future releases; but this matches the compiler's
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27 behavior in Python 1.4 and 1.5.
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28
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29 """
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30
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31 err = err1 = err2 = None
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32 code = code1 = code2 = None
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33
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34 try:
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35 code = compile(source, filename, symbol)
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36 except SyntaxError, err:
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37 pass
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38
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39 try:
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40 code1 = compile(source + "\n", filename, symbol)
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41 except SyntaxError, err1:
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42 pass
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43
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44 try:
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45 code2 = compile(source + "\n\n", filename, symbol)
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46 except SyntaxError, err2:
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47 pass
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48
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49 if code:
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50 return code
7097
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51 try:
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52 e1 = err1.__dict__
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53 except AttributeError:
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54 e1 = err1
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55 try:
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56 e2 = err2.__dict__
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57 except AttributeError:
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58 e2 = err2
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59 if not code1 and e1 == e2:
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60 raise SyntaxError, err1
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61
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62
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63 def interact(banner=None, readfunc=raw_input, local=None):
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64 # Due to Jeff Epler, with changes by Guido:
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65 """Closely emulate the interactive Python console."""
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66 try: import readline # Enable GNU readline if available
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67 except: pass
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68 local = local or {}
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69 import sys, string, traceback
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70 sys.ps1 = '>>> '
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71 sys.ps2 = '... '
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72 if banner:
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73 print banner
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74 else:
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75 print "Python Interactive Console", sys.version
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76 print sys.copyright
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77 buf = []
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78 while 1:
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79 if buf: prompt = sys.ps2
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80 else: prompt = sys.ps1
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81 try: line = readfunc(prompt)
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82 except KeyboardInterrupt:
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83 print "\nKeyboardInterrupt"
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84 buf = []
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85 continue
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86 except EOFError: break
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87 buf.append(line)
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88 try: x = compile_command(string.join(buf, "\n"))
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89 except SyntaxError:
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90 traceback.print_exc(0)
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91 buf = []
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92 continue
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93 if x == None: continue
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94 else:
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95 try: exec x in local
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96 except:
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97 exc_type, exc_value, exc_traceback = \
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98 sys.exc_type, sys.exc_value, \
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99 sys.exc_traceback
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100 l = len(traceback.extract_tb(sys.exc_traceback))
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101 try: 1/0
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102 except:
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103 m = len(traceback.extract_tb(
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104 sys.exc_traceback))
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105 traceback.print_exception(exc_type,
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106 exc_value, exc_traceback, l-m)
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107 buf = []
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108
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109 if __name__ == '__main__':
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110 interact()