cpython-lru_cache-weakref: Lib/StringIO.py annotate

annotate Lib/StringIO.py @ 16413:8819867f14ef legacy-trunk

Patch derived from Trent's 101162: a Python/C API testing framework. STILL NEEDS UNIX BUILD CHANGES.

author	Tim Peters <tim.peters@gmail.com>
date	Fri, 02 Feb 2001 05:57:15 +0000
parents	b5345e99596b
children	f42799c68929

rev	line source
11691 e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	1 """File-like objects that read from or write to a string buffer.
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	2
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	3 This implements (nearly) all stdio methods.
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	4
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	5 f = StringIO() # ready for writing
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	6 f = StringIO(buf) # ready for reading
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	7 f.close() # explicitly release resources held
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	8 flag = f.isatty() # always false
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	9 pos = f.tell() # get current position
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	10 f.seek(pos) # set current position
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	11 f.seek(pos, mode) # mode 0: absolute; 1: relative; 2: relative to EOF
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	12 buf = f.read() # read until EOF
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	13 buf = f.read(n) # read up to n bytes
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	14 buf = f.readline() # read until end of line ('\n') or EOF
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	15 list = f.readlines()# list of f.readline() results until EOF
14904 b15fce868e50 Add truncate() method to StringIO objects. Fred Drake <fdrake@acm.org> parents: 14680 diff changeset	16 f.truncate([size]) # truncate file at to at most size (default: current pos)
11691 e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	17 f.write(buf) # write at current position
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	18 f.writelines(list) # for line in list: f.write(line)
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	19 f.getvalue() # return whole file's contents as a string
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	20
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	21 Notes:
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	22 - Using a real file is often faster (but less convenient).
11870 d7eca5b0960a Simple changes by Gerrit Holl - move author acknowledgements out of Guido van Rossum <guido@python.org> parents: 11691 diff changeset	23 - There's also a much faster implementation in C, called cStringIO, but
d7eca5b0960a Simple changes by Gerrit Holl - move author acknowledgements out of Guido van Rossum <guido@python.org> parents: 11691 diff changeset	24 it's not subclassable.
11691 e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	25 - fileno() is left unimplemented so that code which uses it triggers
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	26 an exception early.
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	27 - Seeking far beyond EOF and then writing will insert real null
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	28 bytes that occupy space in the buffer.
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	29 - There's a simple test set (see end of this file).
e34991022571 Mass patch by Ka-Ping Yee: Guido van Rossum <guido@python.org> parents: 9016 diff changeset	30 """
1680 0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	31
15541 58bc99e012a8 Accept Finn Bock's patch #102208 to hardcode EINVAL to 22 when errno Barry Warsaw <barry@python.org> parents: 15174 diff changeset	32 try:
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	33 from errno import EINVAL
15541 58bc99e012a8 Accept Finn Bock's patch #102208 to hardcode EINVAL to 22 when errno Barry Warsaw <barry@python.org> parents: 15174 diff changeset	34 except ImportError:
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	35 EINVAL = 22
15541 58bc99e012a8 Accept Finn Bock's patch #102208 to hardcode EINVAL to 22 when errno Barry Warsaw <barry@python.org> parents: 15174 diff changeset	36
16070 b5345e99596b added __all__ lists to a number of Python modules Skip Montanaro <skip@pobox.com> parents: 15555 diff changeset	37 __all__ = ["StringIO"]
b5345e99596b added __all__ lists to a number of Python modules Skip Montanaro <skip@pobox.com> parents: 15555 diff changeset	38
15541 58bc99e012a8 Accept Finn Bock's patch #102208 to hardcode EINVAL to 22 when errno Barry Warsaw <barry@python.org> parents: 15174 diff changeset	39 EMPTYSTRING = ''
1680 0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	40
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	41 class StringIO:
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	42 def __init__(self, buf = ''):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	43 self.buf = buf
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	44 self.len = len(buf)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	45 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	46 self.pos = 0
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	47 self.closed = 0
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	48 self.softspace = 0
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	49
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	50 def close(self):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	51 if not self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	52 self.closed = 1
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	53 del self.buf, self.pos
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	54
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	55 def isatty(self):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	56 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	57 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	58 return 0
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	59
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	60 def seek(self, pos, mode = 0):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	61 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	62 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	63 if self.buflist:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	64 self.buf += EMPTYSTRING.join(self.buflist)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	65 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	66 if mode == 1:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	67 pos += self.pos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	68 elif mode == 2:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	69 pos += self.len
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	70 self.pos = max(0, pos)
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	71
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	72 def tell(self):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	73 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	74 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	75 return self.pos
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	76
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	77 def read(self, n = -1):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	78 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	79 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	80 if self.buflist:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	81 self.buf += EMPTYSTRING.join(self.buflist)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	82 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	83 if n < 0:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	84 newpos = self.len
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	85 else:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	86 newpos = min(self.pos+n, self.len)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	87 r = self.buf[self.pos:newpos]
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	88 self.pos = newpos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	89 return r
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	90
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	91 def readline(self, length=None):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	92 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	93 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	94 if self.buflist:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	95 self.buf += EMPTYSTRING.join(self.buflist)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	96 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	97 i = self.buf.find('\n', self.pos)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	98 if i < 0:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	99 newpos = self.len
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	100 else:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	101 newpos = i+1
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	102 if length is not None:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	103 if self.pos + length < newpos:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	104 newpos = self.pos + length
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	105 r = self.buf[self.pos:newpos]
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	106 self.pos = newpos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	107 return r
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	108
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	109 def readlines(self, sizehint = 0):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	110 total = 0
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	111 lines = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	112 line = self.readline()
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	113 while line:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	114 lines.append(line)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	115 total += len(line)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	116 if 0 < sizehint <= total:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	117 break
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	118 line = self.readline()
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	119 return lines
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	120
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	121 def truncate(self, size=None):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	122 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	123 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	124 if size is None:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	125 size = self.pos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	126 elif size < 0:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	127 raise IOError(EINVAL, "Negative size not allowed")
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	128 elif size < self.pos:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	129 self.pos = size
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	130 self.buf = self.getvalue()[:size]
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	131
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	132 def write(self, s):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	133 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	134 raise ValueError, "I/O operation on closed file"
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	135 if not s: return
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	136 if self.pos > self.len:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	137 self.buflist.append('\0'*(self.pos - self.len))
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	138 self.len = self.pos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	139 newpos = self.pos + len(s)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	140 if self.pos < self.len:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	141 if self.buflist:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	142 self.buf += EMPTYSTRING.join(self.buflist)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	143 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	144 self.buflist = [self.buf[:self.pos], s, self.buf[newpos:]]
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	145 self.buf = ''
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	146 if newpos > self.len:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	147 self.len = newpos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	148 else:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	149 self.buflist.append(s)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	150 self.len = newpos
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	151 self.pos = newpos
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	152
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	153 def writelines(self, list):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	154 self.write(EMPTYSTRING.join(list))
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	155
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	156 def flush(self):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	157 if self.closed:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	158 raise ValueError, "I/O operation on closed file"
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	159
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	160 def getvalue(self):
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	161 if self.buflist:
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	162 self.buf += EMPTYSTRING.join(self.buflist)
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	163 self.buflist = []
f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	164 return self.buf
1680 0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	165
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	166
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	167 # A little test suite
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	168
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	169 def test():
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	170 import sys
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	171 if sys.argv[1:]:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	172 file = sys.argv[1]
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	173 else:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	174 file = '/etc/passwd'
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	175 lines = open(file, 'r').readlines()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	176 text = open(file, 'r').read()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	177 f = StringIO()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	178 for line in lines[:-2]:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	179 f.write(line)
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	180 f.writelines(lines[-2:])
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	181 if f.getvalue() != text:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	182 raise RuntimeError, 'write failed'
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	183 length = f.tell()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	184 print 'File length =', length
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	185 f.seek(len(lines[0]))
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	186 f.write(lines[1])
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	187 f.seek(0)
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	188 print 'First line =', `f.readline()`
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	189 here = f.tell()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	190 line = f.readline()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	191 print 'Second line =', `line`
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	192 f.seek(-len(line), 1)
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	193 line2 = f.read(len(line))
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	194 if line != line2:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	195 raise RuntimeError, 'bad result after seek back'
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	196 f.seek(len(line2), 1)
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	197 list = f.readlines()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	198 line = list[-1]
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	199 f.seek(f.tell() - len(line))
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	200 line2 = f.read()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	201 if line != line2:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	202 raise RuntimeError, 'bad result after seek back from EOF'
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	203 print 'Read', len(list), 'more lines'
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	204 print 'File length =', f.tell()
6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	205 if f.tell() != length:
15555 f72345b43662 Untabify! (Barry, this is gonna cost you a bottle of wine! ;) Fred Drake <fdrake@acm.org> parents: 15542 diff changeset	206 raise RuntimeError, 'bad length'
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	207 f.close()
1680 0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	208
0a60460e99f0 Two new generally useful modules: types defines names for all built-in types, Guido van Rossum <guido@python.org> parents: diff changeset	209 if __name__ == '__main__':
15542 6359480106ec Change the file's indentation from tabs to 4 spaces per level. Barry Warsaw <barry@python.org> parents: 15541 diff changeset	210 test()

Mercurial > cpython-lru_cache-weakref

annotate Lib/StringIO.py @ 16413:8819867f14ef legacy-trunk