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Commit Description:
merge with algo and add brython files that were missing
Commit Description:
merge with algo and add brython files that were missing
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lib/assets/Lib/io.py
| 296 lines
| 9.6 KiB
| text/x-python
| PythonLexer
|
| r584 | import builtins | |||
| open = builtins.open | ||||
| # for seek() | ||||
| SEEK_SET = 0 | ||||
| SEEK_CUR = 1 | ||||
| SEEK_END = 2 | ||||
| r"""File-like objects that read from or write to a string buffer. | ||||
| 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.truncate([size]) # truncate file at to at most size (default: current pos) | ||||
| 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). | ||||
| - There's also a much faster implementation in C, called cStringIO, but | ||||
| it's not subclassable. | ||||
| - 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). | ||||
| """ | ||||
| try: | ||||
| from errno import EINVAL | ||||
| except ImportError: | ||||
| EINVAL = 22 | ||||
| __all__ = ["StringIO"] | ||||
| def _complain_ifclosed(closed): | ||||
| if closed: | ||||
| raise ValueError("I/O operation on closed file") | ||||
| class StringIO: | ||||
| """class StringIO([buffer]) | ||||
| When a StringIO object is created, it can be initialized to an existing | ||||
| string by passing the string to the constructor. If no string is given, | ||||
| the StringIO will start empty. | ||||
| The StringIO object can accept either Unicode or 8-bit strings, but | ||||
| mixing the two may take some care. If both are used, 8-bit strings that | ||||
| cannot be interpreted as 7-bit ASCII (that use the 8th bit) will cause | ||||
| a UnicodeError to be raised when getvalue() is called. | ||||
| """ | ||||
| def __init__(self, buf = ''): | ||||
| self.buf = buf | ||||
| self.len = len(buf) | ||||
| self.buflist = [] | ||||
| self.pos = 0 | ||||
| self.closed = False | ||||
| self.softspace = 0 | ||||
| def __iter__(self): | ||||
| return self | ||||
| def next(self): | ||||
| """A file object is its own iterator, for example iter(f) returns f | ||||
| (unless f is closed). When a file is used as an iterator, typically | ||||
| in a for loop (for example, for line in f: print line), the next() | ||||
| method is called repeatedly. This method returns the next input line, | ||||
| or raises StopIteration when EOF is hit. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| r = self.readline() | ||||
| if not r: | ||||
| raise StopIteration | ||||
| return r | ||||
| def close(self): | ||||
| """Free the memory buffer. | ||||
| """ | ||||
| if not self.closed: | ||||
| self.closed = True | ||||
| del self.buf, self.pos | ||||
| def isatty(self): | ||||
| """Returns False because StringIO objects are not connected to a | ||||
| tty-like device. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| return False | ||||
| def seek(self, pos, mode = 0): | ||||
| """Set the file's current position. | ||||
| The mode argument is optional and defaults to 0 (absolute file | ||||
| positioning); other values are 1 (seek relative to the current | ||||
| position) and 2 (seek relative to the file's end). | ||||
| There is no return value. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if self.buflist: | ||||
| self.buf += ''.join(self.buflist) | ||||
| self.buflist = [] | ||||
| if mode == 1: | ||||
| pos += self.pos | ||||
| elif mode == 2: | ||||
| pos += self.len | ||||
| self.pos = max(0, pos) | ||||
| def tell(self): | ||||
| """Return the file's current position.""" | ||||
| _complain_ifclosed(self.closed) | ||||
| return self.pos | ||||
| def read(self, n = -1): | ||||
| """Read at most size bytes from the file | ||||
| (less if the read hits EOF before obtaining size bytes). | ||||
| If the size argument is negative or omitted, read all data until EOF | ||||
| is reached. The bytes are returned as a string object. An empty | ||||
| string is returned when EOF is encountered immediately. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if self.buflist: | ||||
| self.buf += ''.join(self.buflist) | ||||
| self.buflist = [] | ||||
| if n is None or 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): | ||||
| r"""Read one entire line from the file. | ||||
| A trailing newline character is kept in the string (but may be absent | ||||
| when a file ends with an incomplete line). If the size argument is | ||||
| present and non-negative, it is a maximum byte count (including the | ||||
| trailing newline) and an incomplete line may be returned. | ||||
| An empty string is returned only when EOF is encountered immediately. | ||||
| Note: Unlike stdio's fgets(), the returned string contains null | ||||
| characters ('\0') if they occurred in the input. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if self.buflist: | ||||
| self.buf += ''.join(self.buflist) | ||||
| self.buflist = [] | ||||
| i = self.buf.find('\n', self.pos) | ||||
| if i < 0: | ||||
| newpos = self.len | ||||
| else: | ||||
| newpos = i+1 | ||||
| if length is not None and length >= 0: | ||||
| if self.pos + length < newpos: | ||||
| newpos = self.pos + length | ||||
| r = self.buf[self.pos:newpos] | ||||
| self.pos = newpos | ||||
| return r | ||||
| def readlines(self, sizehint = 0): | ||||
| """Read until EOF using readline() and return a list containing the | ||||
| lines thus read. | ||||
| If the optional sizehint argument is present, instead of reading up | ||||
| to EOF, whole lines totalling approximately sizehint bytes (or more | ||||
| to accommodate a final whole line). | ||||
| """ | ||||
| total = 0 | ||||
| lines = [] | ||||
| line = self.readline() | ||||
| while line: | ||||
| lines.append(line) | ||||
| total += len(line) | ||||
| if 0 < sizehint <= total: | ||||
| break | ||||
| line = self.readline() | ||||
| return lines | ||||
| def truncate(self, size=None): | ||||
| """Truncate the file's size. | ||||
| If the optional size argument is present, the file is truncated to | ||||
| (at most) that size. The size defaults to the current position. | ||||
| The current file position is not changed unless the position | ||||
| is beyond the new file size. | ||||
| If the specified size exceeds the file's current size, the | ||||
| file remains unchanged. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if size is None: | ||||
| size = self.pos | ||||
| elif size < 0: | ||||
| raise IOError(EINVAL, "Negative size not allowed") | ||||
| elif size < self.pos: | ||||
| self.pos = size | ||||
| self.buf = self.getvalue()[:size] | ||||
| self.len = size | ||||
| def write(self, s): | ||||
| """Write a string to the file. | ||||
| There is no return value. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if not s: return | ||||
| spos = self.pos | ||||
| slen = self.len | ||||
| if spos == slen: | ||||
| self.buflist.append(s) | ||||
| self.len = self.pos = spos + len(s) | ||||
| return | ||||
| if spos > slen: | ||||
| self.buflist.append('\0'*(spos - slen)) | ||||
| slen = spos | ||||
| newpos = spos + len(s) | ||||
| if spos < slen: | ||||
| if self.buflist: | ||||
| self.buf += ''.join(self.buflist) | ||||
| self.buflist = [self.buf[:spos], s, self.buf[newpos:]] | ||||
| self.buf = '' | ||||
| if newpos > slen: | ||||
| slen = newpos | ||||
| else: | ||||
| self.buflist.append(s) | ||||
| slen = newpos | ||||
| self.len = slen | ||||
| self.pos = newpos | ||||
| def writelines(self, iterable): | ||||
| """Write a sequence of strings to the file. The sequence can be any | ||||
| iterable object producing strings, typically a list of strings. There | ||||
| is no return value. | ||||
| (The name is intended to match readlines(); writelines() does not add | ||||
| line separators.) | ||||
| """ | ||||
| write = self.write | ||||
| for line in iterable: | ||||
| write(line) | ||||
| def flush(self): | ||||
| """Flush the internal buffer | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| def getvalue(self): | ||||
| """ | ||||
| Retrieve the entire contents of the "file" at any time before | ||||
| the StringIO object's close() method is called. | ||||
| The StringIO object can accept either Unicode or 8-bit strings, | ||||
| but mixing the two may take some care. If both are used, 8-bit | ||||
| strings that cannot be interpreted as 7-bit ASCII (that use the | ||||
| 8th bit) will cause a UnicodeError to be raised when getvalue() | ||||
| is called. | ||||
| """ | ||||
| _complain_ifclosed(self.closed) | ||||
| if self.buflist: | ||||
| self.buf += ''.join(self.buflist) | ||||
| self.buflist = [] | ||||
| return self.buf | ||||
| TextIOWrapper = StringIO | ||||
| class RawIOBase: | ||||
| def read(self,n=-1): | ||||
| pass | ||||
| def readall(self): | ||||
| pass | ||||
| def readinto(self,b): | ||||
| pass | ||||
| def write(self,b): | ||||
| pass | ||||
| # XXX Brython : the following are here just to avoid AttributeError | ||||
| BufferedIOBase = RawIOBase | ||||
| BufferedReader = RawIOBase | ||||
| #from _io import * | ||||