Mercurial > cpython-lru_cache-weakref
annotate Lib/codehack.py @ 5834:91aea1af654f legacy-trunk
This module is now completely obsolete.
Noted this in the XXX comments.
Also, changed all three functions to use the attributes if they exist.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 18 Jul 1997 16:48:30 +0000 |
| parents | 1940892d2fe3 |
| children |
| rev | line source |
|---|---|
| 622 | 1 # A subroutine for extracting a function name from a code object |
| 2 # (with cache) | |
| 3 | |
| 4 import sys | |
| 5 from stat import * | |
| 6 import string | |
| 7 import os | |
| 8 import linecache | |
| 9 | |
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1746
1940892d2fe3
Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents:
723
diff
changeset
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10 # XXX The functions getcodename() and getfuncname() are now obsolete |
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1940892d2fe3
Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents:
723
diff
changeset
|
11 # XXX as code and function objects now have a name attribute -- |
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1940892d2fe3
Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents:
723
diff
changeset
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12 # XXX co.co_name and f.func_name. |
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5834
91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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13 # XXX getlineno() is now also obsolete because of the new attribute |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
|
14 # XXX of code objects, co.co_firstlineno. |
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1746
1940892d2fe3
Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents:
723
diff
changeset
|
15 |
| 622 | 16 # Extract the function or class name from a code object. |
| 17 # This is a bit of a hack, since a code object doesn't contain | |
| 18 # the name directly. So what do we do: | |
| 19 # - get the filename (which *is* in the code object) | |
| 20 # - look in the code string to find the first SET_LINENO instruction | |
| 21 # (this must be the first instruction) | |
| 22 # - get the line from the file | |
| 23 # - if the line starts with 'class' or 'def' (after possible whitespace), | |
| 24 # extract the following identifier | |
| 25 # | |
| 26 # This breaks apart when the function was read from <stdin> | |
| 27 # or constructed by exec(), when the file is not accessible, | |
| 28 # and also when the file has been modified or when a line is | |
| 29 # continued with a backslash before the function or class name. | |
| 30 # | |
| 31 # Because this is a pretty expensive hack, a cache is kept. | |
| 32 | |
| 33 SET_LINENO = 127 # The opcode (see "opcode.h" in the Python source) | |
| 34 identchars = string.letters + string.digits + '_' # Identifier characters | |
| 35 | |
| 36 _namecache = {} # The cache | |
| 37 | |
| 38 def getcodename(co): | |
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This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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39 try: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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40 return co.co_name |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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41 except AttributeError: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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42 pass |
| 622 | 43 key = `co` # arbitrary but uniquely identifying string |
| 44 if _namecache.has_key(key): return _namecache[key] | |
| 45 filename = co.co_filename | |
| 46 code = co.co_code | |
| 47 name = '' | |
| 48 if ord(code[0]) == SET_LINENO: | |
| 49 lineno = ord(code[1]) | ord(code[2]) << 8 | |
| 50 line = linecache.getline(filename, lineno) | |
| 51 words = string.split(line) | |
| 52 if len(words) >= 2 and words[0] in ('def', 'class'): | |
| 53 name = words[1] | |
| 54 for i in range(len(name)): | |
| 55 if name[i] not in identchars: | |
| 56 name = name[:i] | |
| 57 break | |
| 58 _namecache[key] = name | |
| 59 return name | |
| 60 | |
| 61 # Use the above routine to find a function's name. | |
| 62 | |
| 63 def getfuncname(func): | |
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5834
91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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64 try: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
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changeset
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65 return func.func_name |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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66 except AttributeError: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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67 pass |
| 622 | 68 return getcodename(func.func_code) |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
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69 |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
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70 # A part of the above code to extract just the line number from a code object. |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
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71 |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
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72 def getlineno(co): |
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5834
91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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73 try: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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74 return co.co_firstlineno |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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75 except AttributeError: |
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91aea1af654f
This module is now completely obsolete.
Guido van Rossum <guido@python.org>
parents:
1746
diff
changeset
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76 pass |
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723
e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
|
77 code = co.co_code |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
|
78 if ord(code[0]) == SET_LINENO: |
|
e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
|
79 return ord(code[1]) | ord(code[2]) << 8 |
|
e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
|
80 else: |
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e7571a18bdef
Add a function to return just the line number of a code object.
Guido van Rossum <guido@python.org>
parents:
622
diff
changeset
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81 return -1 |