Mercurial > cpython-lru_cache-weakref

annotate Lib/multifile.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 1940892d2fe3
children e29029029414
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
915
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1 # A class that makes each part of a multipart message "feel" like an
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2 # ordinary file, as long as you use fp.readline(). Allows recursive
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3 # use, for nested multipart messages. Probably best used together
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4 # with module mimetools.
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5 #
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6 # Suggested use:
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7 #
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8 # real_fp = open(...)
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9 # fp = MultiFile(real_fp)
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10 #
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11 # "read some lines from fp"
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12 # fp.push(separator)
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13 # while 1:
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14 # "read lines from fp until it returns an empty string" (A)
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15 # if not fp.next(): break
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16 # fp.pop()
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17 # "read remaining lines from fp until it returns an empty string"
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18 #
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19 # The latter sequence may be used recursively at (A).
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20 # It is also allowed to use multiple push()...pop() sequences.
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21 # Note that if a nested multipart message is terminated by a separator
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22 # for an outer message, this is not reported, even though it is really
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23 # illegal input.
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24
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25 import sys
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26 import string
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27
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28 err = sys.stderr.write
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29
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30 Error = 'multifile.Error'
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31
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32 class MultiFile:
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33 #
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34 def __init__(self, fp):
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35 self.fp = fp
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36 self.stack = [] # Grows down
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37 self.level = 0
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38 self.last = 0
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39 self.start = self.fp.tell()
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40 self.posstack = [] # Grows down
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41 #
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42 def tell(self):
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43 if self.level > 0:
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44 return self.lastpos
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45 return self.fp.tell() - self.start
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46 #
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47 def seek(self, pos):
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48 if not 0 <= pos <= self.tell() or \
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49 self.level > 0 and pos > self.lastpos:
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50 raise Error, 'bad MultiFile.seek() call'
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51 self.fp.seek(pos + self.start)
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52 self.level = 0
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53 self.last = 0
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54 #
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55 def readline(self):
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56 if self.level > 0: return ''
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57 line = self.fp.readline()
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58 if not line:
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59 self.level = len(self.stack)
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60 self.last = (self.level > 0)
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61 if self.last:
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62 err('*** Sudden EOF in MultiFile.readline()\n')
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63 return ''
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64 if line[:2] <> '--': return line
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65 n = len(line)
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66 k = n
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67 while k > 0 and line[k-1] in string.whitespace: k = k-1
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68 mark = line[2:k]
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69 if mark[-2:] == '--': mark1 = mark[:-2]
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70 else: mark1 = None
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71 for i in range(len(self.stack)):
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72 sep = self.stack[i]
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73 if sep == mark:
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74 self.last = 0
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75 break
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76 elif mark1 <> None and sep == mark1:
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77 self.last = 1
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78 break
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79 else:
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80 return line
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81 # Get here after break out of loop
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82 self.lastpos = self.tell() - len(line)
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83 self.level = i+1
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84 if self.level > 1:
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85 err('*** Missing endmarker in MultiFile.readline()\n')
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86 return ''
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87 #
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88 def readlines(self):
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89 list = []
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90 while 1:
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91 line = self.readline()
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92 if not line: break
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93 list.append(line)
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94 return list
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95 #
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96 def read(self): # Note: no size argument -- read until EOF only!
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97 return string.joinfields(self.readlines(), '')
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98 #
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99 def next(self):
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100 while self.readline(): pass
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101 if self.level > 1 or self.last:
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102 return 0
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103 self.level = 0
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104 self.last = 0
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105 self.start = self.fp.tell()
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106 return 1
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107 #
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108 def push(self, sep):
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109 if self.level > 0:
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110 raise Error, 'bad MultiFile.push() call'
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111 self.stack.insert(0, sep)
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112 self.posstack.insert(0, self.start)
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113 self.start = self.fp.tell()
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114 #
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115 def pop(self):
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116 if self.stack == []:
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117 raise Error, 'bad MultiFile.pop() call'
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118 if self.level <= 1:
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119 self.last = 0
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120 else:
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121 abslastpos = self.lastpos + self.start
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122 self.level = max(0, self.level - 1)
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123 del self.stack[0]
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124 self.start = self.posstack[0]
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125 del self.posstack[0]
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126 if self.level > 0:
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127 self.lastpos = abslastpos - self.start
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128 #