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annotate Lib/code.py @ 6719:faebc1940432 legacy-trunk

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Understand -Xlinker option.
author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents 644484e1a37b
children 00a85ab0337f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # XXX This is broken with class exceptions
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2
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3 """Utilities dealing with code objects."""
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4
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5 def compile_command(source, filename="<input>", symbol="single"):
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6 r"""Compile a command and determine whether it is incomplete.
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7
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8 Arguments:
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9
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10 source -- the source string; may contain \n characters
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11 filename -- optional filename from which source was read; default "<input>"
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12 symbol -- optional grammar start symbol; "single" (default) or "eval"
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13
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14 Return value / exception raised:
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15
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16 - Return a code object if the command is complete and valid
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17 - Return None if the command is incomplete
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18 - Raise SyntaxError if the command is a syntax error
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19
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20 Approach:
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21
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22 Compile three times: as is, with \n, and with \n\n appended. If
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23 it compiles as is, it's complete. If it compiles with one \n
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24 appended, we expect more. If it doesn't compile either way, we
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25 compare the error we get when compiling with \n or \n\n appended.
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26 If the errors are the same, the code is broken. But if the errors
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27 are different, we expect more. Not intuitive; not even guaranteed
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28 to hold in future releases; but this matches the compiler's
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29 behavior in Python 1.4 and 1.5.
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30
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31 """
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32
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33 err = err1 = err2 = None
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34 code = code1 = code2 = None
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35
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36 try:
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37 code = compile(source, filename, symbol)
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38 except SyntaxError, err:
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39 pass
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40
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41 try:
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42 code1 = compile(source + "\n", filename, symbol)
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43 except SyntaxError, err1:
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44 pass
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45
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46 try:
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47 code2 = compile(source + "\n\n", filename, symbol)
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48 except SyntaxError, err2:
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49 pass
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50
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51 if code:
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52 return code
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53 if not code1 and err1 == err2:
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54 raise SyntaxError, err1
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55
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56
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57 def interact(banner=None, readfunc=raw_input, local=None):
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58 # Due to Jeff Epler, with changes by Guido:
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59 """Closely emulate the interactive Python console."""
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60 try: import readline # Enable GNU readline if available
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61 except: pass
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62 local = local or {}
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63 import sys, string, traceback
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64 sys.ps1 = '>>> '
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65 sys.ps2 = '... '
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66 if banner:
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67 print banner
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68 else:
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69 print "Python Interactive Console", sys.version
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70 print sys.copyright
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71 buf = []
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72 while 1:
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73 if buf: prompt = sys.ps2
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74 else: prompt = sys.ps1
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75 try: line = readfunc(prompt)
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76 except KeyboardInterrupt:
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77 print "\nKeyboardInterrupt"
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78 buf = []
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79 continue
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80 except EOFError: break
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81 buf.append(line)
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82 try: x = compile_command(string.join(buf, "\n"))
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83 except SyntaxError:
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84 traceback.print_exc(0)
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85 buf = []
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86 continue
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87 if x == None: continue
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88 else:
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89 try: exec x in local
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90 except:
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91 exc_type, exc_value, exc_traceback = \
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92 sys.exc_type, sys.exc_value, \
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93 sys.exc_traceback
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94 l = len(traceback.extract_tb(sys.exc_traceback))
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95 try: 1/0
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96 except:
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97 m = len(traceback.extract_tb(
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98 sys.exc_traceback))
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99 traceback.print_exception(exc_type,
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100 exc_value, exc_traceback, l-m)
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101 buf = []
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102
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103 if __name__ == '__main__':
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104 interact()