| [976] | 1 |
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| 2 | ##
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| 3 | ## Stream Base Class
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| 4 | ##
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| 5 | class Stream(object):
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| 6 |
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| 7 | def __init__(self, data):
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| 8 |
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| 9 | self.data = data
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| 10 |
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| 11 | def __del__(self):
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| 12 |
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| 13 | self.data.close()
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| 14 |
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| 15 | def close(self):
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| 16 |
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| 17 | self.data.close()
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| 18 |
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| 19 | def records(self):
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| 20 |
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| 21 | records = []
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| 22 |
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| 23 | for record in self:
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| 24 | records.append(record)
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| 25 |
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| 26 | return records
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| 27 |
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| 28 | ##
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| 29 | ## ParsedStream
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| 30 | ##
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| 31 | class ParsedStream(object):
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| 32 |
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| 33 | def __init__(self, stream, parse=None, parse_args=[], parse_kwargs={}):
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| 34 |
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| 35 | self.stream = stream
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| 36 | self.parse = parse
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| 37 | self.parse_args = parse_args
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| 38 | self.parse_kwargs = parse_kwargs
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| 39 |
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| 40 | def __iter__(self):
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| 41 |
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| 42 | return self
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| 43 |
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| 44 | def next(self):
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| 45 |
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| 46 | try:
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| 47 | record = self.stream.next()
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| 48 | args = self.parse_args
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| 49 | kwargs = self.parse_kwargs
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| 50 | return self.parse(record, *args, **kwargs)
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| 51 | except StopIteration:
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| 52 | self.stream.close()
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| 53 | raise StopIteration
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| 54 |
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| 55 |
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| 56 | ##
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| 57 | ## Stream of records separated by newlines
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| 58 | ##
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| 59 | class NewLineStream(Stream):
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| 60 |
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| 61 | def __init__(self, data, header=0):
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| 62 |
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| 63 | Stream.__init__(self, data)
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| 64 |
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| 65 | for i in range(header):
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| 66 | line = self.data.readline()
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| 67 |
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| 68 | def __iter__(self):
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| 69 |
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| 70 | return self
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| 71 |
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| 72 | def next(self):
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| 73 |
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| 74 | line = self.data.readline()
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| 75 |
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| 76 | if line:
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| 77 | return line.rstrip('\r\n')
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| 78 | else:
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| 79 | raise StopIteration
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| 80 |
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| 81 |
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| 82 | ##
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| 83 | ## Stream of a single record
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| 84 | ##
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| 85 | class SingleRecordStream(Stream):
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| 86 |
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| 87 | def __init__(self, data, header=0):
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| 88 |
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| 89 | Stream.__init__(self, data)
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| 90 |
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| 91 | for i in range(header):
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| 92 | line = self.data.readline()
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| 93 |
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| 94 | def __iter__(self):
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| 95 |
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| 96 | return self
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| 97 |
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| 98 | def next(self):
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| 99 |
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| 100 | record = []
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| 101 | lines = self.data.readlines()
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| 102 |
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| 103 | if lines:
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| 104 | for line in lines:
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| 105 | record.append(line.rstrip('\r\n'))
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| 106 | return record
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| 107 | else:
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| 108 | raise StopIteration
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| 109 |
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| 110 |
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| 111 | ##
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| 112 | ## Stream of records separated by blank lines
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| 113 | ##
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| 114 | class BlankLineStream(Stream):
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| 115 |
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| 116 | def __init__(self, data, header=0):
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| 117 |
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| 118 | Stream.__init__(self, data)
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| 119 |
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| 120 | for i in range(header):
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| 121 | line = self.data.readline()
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| 122 |
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| 123 | def __iter__(self):
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| 124 |
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| 125 | return self
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| 126 |
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| 127 | def next(self):
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| 128 |
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| 129 | record = []
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| 130 | line = self.data.readline()
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| 131 |
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| 132 | if not line:
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| 133 | raise StopIteration
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| 134 |
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| 135 | while line not in ['\n', '\r\n']:
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| 136 | record.append(line.rstrip('\r\n'))
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| 137 | line = self.data.readline()
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| 138 | if not line:
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| 139 | return record
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| 140 |
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| 141 | return record
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| 142 |
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| 143 |
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| 144 | ##
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| 145 | ## Stream of records separated by a single line separator
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| 146 | ##
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| 147 | class LineSeparatorStream(Stream):
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| 148 |
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| 149 | def __init__(self, data, separator='\n', header=0):
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| 150 |
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| 151 | Stream.__init__(self, data)
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| 152 |
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| 153 | if separator[-1] != '\n':
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| 154 | separator = '%s\n' % (separator)
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| 155 |
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| 156 | self.separator = separator
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| 157 |
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| 158 | for i in range(header):
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| 159 | line = self.data.readline()
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| 160 |
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| 161 | def __iter__(self):
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| 162 |
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| 163 | return self
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| 164 |
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| 165 | def next(self):
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| 166 |
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| 167 | record = []
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| 168 | line = self.data.readline()
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| 169 |
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| 170 | if not line:
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| 171 | raise StopIteration
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| 172 |
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| 173 | while line != self.separator:
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| 174 | record.append(line.rstrip('\r\n'))
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| 175 | line = self.data.readline()
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| 176 | if not line:
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| 177 | return record
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| 178 |
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| 179 | return record
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| 180 |
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