Mercurial > cpython-lru_cache-weakref

annotate Mac/Lib/py_resource.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 ade9f996590a
children a94b0a122c98
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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3656
ade9f996590a Module to handle PYC resources
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1 """Creation of PYC resources"""
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2 import os
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3 import Res
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4 import __builtin__
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5
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6 READ = 1
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7 WRITE = 2
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8 smAllScripts = -3
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9
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10 def Pstring(str):
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11 """Return a pascal-style string from a python-style string"""
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12 if len(str) > 255:
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13 raise ValueError, 'String too large'
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14 return chr(len(str))+str
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15
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16 def create(dst, creator='Pyth'):
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17 """Create output file. Return handle and first id to use."""
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18
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19 try:
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20 os.unlink(dst)
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21 except os.error:
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22 pass
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23 Res.FSpCreateResFile(dst, creator, 'rsrc', smAllScripts)
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24 return open(dst)
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25
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26 def open(dst):
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27 output = Res.FSpOpenResFile(dst, WRITE)
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28 Res.UseResFile(output)
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29 return output
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30
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31 def writemodule(name, id, data, type='PYC '):
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32 """Write pyc code to a PYC resource with given name and id."""
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33 # XXXX Check that it doesn't exist
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34 res = Res.Resource(data)
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35 res.AddResource(type, id, name)
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36 res.WriteResource()
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37 res.ReleaseResource()
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38
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39 def frompycfile(file, name=None):
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40 """Copy one pyc file to the open resource file"""
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41 if name == None:
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42 d, name = os.path.split(file)
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43 name = name[:-4]
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44 id = findfreeid()
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45 writemodule(name, id, __builtin__.open(file, 'rb').read())
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46 return id, name
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47
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48 def frompyfile(file, name=None):
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49 """Compile python source file to pyc file and add to resource file"""
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50 import py_compile
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51
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52 py_compile.compile(file)
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53 file = file +'c'
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54 return frompycfile(file, name)
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55
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56 # XXXX Note this is incorrect, it only handles one type and one file....
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57
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58 _firstfreeid = None
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59
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60 def findfreeid(type='PYC '):
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61 """Find next free id-number for given resource type"""
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62 global _firstfreeid
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63
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64 if _firstfreeid == None:
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65 Res.SetResLoad(0)
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66 highest = 511
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67 num = Res.Count1Resources(type)
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68 for i in range(1, num+1):
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69 r = Res.Get1IndResource(type, i)
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70 id, d1, d2 = r.GetResInfo()
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71 highest = max(highest, id)
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72 Res.SetResLoad(1)
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73 _firstfreeid = highest+1
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74 id = _firstfreeid
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75 _firstfreeid = _firstfreeid+1
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76 return id