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authorGuido van Rossum <guido@python.org>1997-09-09 03:42:09 (GMT)
committerGuido van Rossum <guido@python.org>1997-09-09 03:42:09 (GMT)
commit5c1f5bd5f64c2c60afa5221862fd220cd086c5c8 (patch)
tree3bdb31396ddd2db733b6e216345900279a5b695f /Lib/dos_8x3/stringio.py
parentd7500fcbb4d0257f3bcd0c87d17ee61f3b1545e8 (diff)
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Renamed dos_8x3 to dos-8x3.
Diffstat (limited to 'Lib/dos_8x3/stringio.py')
-rwxr-xr-xLib/dos_8x3/stringio.py159
1 files changed, 0 insertions, 159 deletions
diff --git a/Lib/dos_8x3/stringio.py b/Lib/dos_8x3/stringio.py
deleted file mode 100755
index dba38e4..0000000
--- a/Lib/dos_8x3/stringio.py
+++ /dev/null
@@ -1,159 +0,0 @@
-# class StringIO implements file-like objects that read/write a
-# string buffer (a.k.a. "memory files").
-#
-# This implements (nearly) all stdio methods.
-#
-# f = StringIO() # ready for writing
-# f = StringIO(buf) # ready for reading
-# f.close() # explicitly release resources held
-# flag = f.isatty() # always false
-# pos = f.tell() # get current position
-# f.seek(pos) # set current position
-# f.seek(pos, mode) # mode 0: absolute; 1: relative; 2: relative to EOF
-# buf = f.read() # read until EOF
-# buf = f.read(n) # read up to n bytes
-# buf = f.readline() # read until end of line ('\n') or EOF
-# list = f.readlines()# list of f.readline() results until EOF
-# f.write(buf) # write at current position
-# f.writelines(list) # for line in list: f.write(line)
-# f.getvalue() # return whole file's contents as a string
-#
-# Notes:
-# - Using a real file is often faster (but less convenient).
-# - fileno() is left unimplemented so that code which uses it triggers
-# an exception early.
-# - Seeking far beyond EOF and then writing will insert real null
-# bytes that occupy space in the buffer.
-# - There's a simple test set (see end of this file).
-
-import string
-
-class StringIO:
- def __init__(self, buf = ''):
- self.buf = buf
- self.len = len(buf)
- self.buflist = []
- self.pos = 0
- self.closed = 0
- self.softspace = 0
- def close(self):
- if not self.closed:
- self.closed = 1
- del self.buf, self.pos
- def isatty(self):
- return 0
- def seek(self, pos, mode = 0):
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- if mode == 1:
- pos = pos + self.pos
- elif mode == 2:
- pos = pos + self.len
- self.pos = max(0, pos)
- def tell(self):
- return self.pos
- def read(self, n = -1):
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- if n < 0:
- newpos = self.len
- else:
- newpos = min(self.pos+n, self.len)
- r = self.buf[self.pos:newpos]
- self.pos = newpos
- return r
- def readline(self, length=None):
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- i = string.find(self.buf, '\n', self.pos)
- if i < 0:
- newpos = self.len
- else:
- newpos = i+1
- if length is not None:
- if self.pos + length < newpos:
- newpos = self.pos + length
- r = self.buf[self.pos:newpos]
- self.pos = newpos
- return r
- def readlines(self):
- lines = []
- line = self.readline()
- while line:
- lines.append(line)
- line = self.readline()
- return lines
- def write(self, s):
- if not s: return
- if self.pos > self.len:
- self.buflist.append('\0'*(self.pos - self.len))
- self.len = self.pos
- newpos = self.pos + len(s)
- if self.pos < self.len:
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- self.buflist = [self.buf[:self.pos], s, self.buf[newpos:]]
- self.buf = ''
- else:
- self.buflist.append(s)
- self.len = newpos
- self.pos = newpos
- def writelines(self, list):
- self.write(string.joinfields(list, ''))
- def flush(self):
- pass
- def getvalue(self):
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- return self.buf
-
-
-# A little test suite
-
-def test():
- import sys
- if sys.argv[1:]:
- file = sys.argv[1]
- else:
- file = '/etc/passwd'
- lines = open(file, 'r').readlines()
- text = open(file, 'r').read()
- f = StringIO()
- for line in lines[:-2]:
- f.write(line)
- f.writelines(lines[-2:])
- if f.getvalue() != text:
- raise RuntimeError, 'write failed'
- length = f.tell()
- print 'File length =', length
- f.seek(len(lines[0]))
- f.write(lines[1])
- f.seek(0)
- print 'First line =', `f.readline()`
- here = f.tell()
- line = f.readline()
- print 'Second line =', `line`
- f.seek(-len(line), 1)
- line2 = f.read(len(line))
- if line != line2:
- raise RuntimeError, 'bad result after seek back'
- f.seek(len(line2), 1)
- list = f.readlines()
- line = list[-1]
- f.seek(f.tell() - len(line))
- line2 = f.read()
- if line != line2:
- raise RuntimeError, 'bad result after seek back from EOF'
- print 'Read', len(list), 'more lines'
- print 'File length =', f.tell()
- if f.tell() != length:
- raise RuntimeError, 'bad length'
- f.close()
-
-if __name__ == '__main__':
- test()