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New tty/pty modules by Steen; new urlparser.

This commit is contained in:
Guido van Rossum 1994-09-12 10:36:35 +00:00
parent c0af2aafeb
commit 23cb2a83a5
3 changed files with 336 additions and 0 deletions
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# pty.py -- Pseudo terminal utilities.
# Bugs: No signal handling. Doesn't set slave termios and window size.
# Only tested on Linux.
# See: W. Richard Stevens. 1992. Advanced Programming in the
# UNIX Environment. Chapter 19.
# Author: Steen Lumholt -- with additions by Guido.
from select import select
import os, sys, FCNTL
import tty
STDIN_FILENO = 0
STDOUT_FILENO = 1
STDERR_FILENO = 2
CHILD = 0
# Open pty master. Returns (master_fd, tty_name). SGI and Linux/BSD version.
def master_open():
try:
import sgi
except ImportError:
pass
else:
try:
tty_name, master_fd = sgi._getpty(FCNTL.O_RDWR, 0666, 0)
except IOError, msg:
raise os.error, msg
return master_fd, tty_name
for x in 'pqrstuvwxyzPQRST':
for y in '0123456789abcdef':
pty_name = '/dev/pty' + x + y
try:
fd = os.open(pty_name, FCNTL.O_RDWR)
except os.error:
continue
return (fd, '/dev/tty' + x + y)
raise os.error, 'out of pty devices'
# Open the pty slave. Acquire the controlling terminal.
# Returns file descriptor. Linux version. (Should be universal? --Guido)
def slave_open(tty_name):
return os.open(tty_name, FCNTL.O_RDWR)
# Fork and make the child a session leader with a controlling terminal.
# Returns (pid, master_fd)
def fork():
master_fd, tty_name = master_open()
pid = os.fork()
if pid == CHILD:
# Establish a new session.
os.setsid()
# Acquire controlling terminal.
slave_fd = slave_open(tty_name)
os.close(master_fd)
# Slave becomes stdin/stdout/stderr of child.
os.dup2(slave_fd, STDIN_FILENO)
os.dup2(slave_fd, STDOUT_FILENO)
os.dup2(slave_fd, STDERR_FILENO)
if (slave_fd > STDERR_FILENO):
os.close (slave_fd)
# Parent and child process.
return pid, master_fd
# Write all the data to a descriptor.
def writen(fd, data):
while data != '':
n = os.write(fd, data)
data = data[n:]
# Default read function.
def read(fd):
return os.read(fd, 1024)
# Parent copy loop.
# Copies
# pty master -> standard output (master_read)
# standard input -> pty master (stdin_read)
def copy(master_fd, master_read=read, stdin_read=read):
while 1:
rfds, wfds, xfds = select(
[master_fd, STDIN_FILENO], [], [])
if master_fd in rfds:
data = master_read(master_fd)
os.write(STDOUT_FILENO, data)
if STDIN_FILENO in rfds:
data = stdin_read(STDIN_FILENO)
writen(master_fd, data)
# Create a spawned process.
def spawn(argv, master_read=read, stdin_read=read):
if type(argv) == type(''):
argv = (argv,)
pid, master_fd = fork()
if pid == CHILD:
apply(os.execlp, (argv[0],) + argv)
mode = tty.tcgetattr(STDIN_FILENO)
tty.setraw(STDIN_FILENO)
try:
copy(master_fd, master_read, stdin_read)
except:
tty.tcsetattr(STDIN_FILENO, tty.TCSAFLUSH, mode)

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# tty.py -- Terminal utilities.
# Author: Steen Lumholt.
from TERMIOS import *
from termios import *
# Indexes for termios list.
IFLAG = 0
OFLAG = 1
CFLAG = 2
LFLAG = 3
ISPEED = 4
OSPEED = 5
CC = 6
# Put terminal into a raw mode.
def setraw(fd, when=TCSAFLUSH):
mode = tcgetattr(fd)
mode[IFLAG] = mode[IFLAG] & ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON)
mode[OFLAG] = mode[OFLAG] & ~(OPOST)
mode[CFLAG] = mode[CFLAG] & ~(CSIZE | PARENB)
mode[CFLAG] = mode[CFLAG] | CS8
mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON | IEXTEN | ISIG)
mode[CC][VMIN] = 1
mode[CC][VTIME] = 0
tcsetattr(fd, when, mode)
# Put terminal into a cbreak mode.
def setcbreak(fd, when=TCSAFLUSH):
mode = tcgetattr(fd)
mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON)
mode[CC][VMIN] = 1
mode[CC][VTIME] = 0
tcsetattr(fd, when, mode)

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# Parse (absolute and relative) URLs according to latest internet draft:
# Uniform Resource Identifiers Working Group R. Fielding
# INTERNET-DRAFT UC Irvine
# Expires February 24, 1995 August 24, 1994
#
# Relative Uniform Resource Locators
# <draft-ietf-uri-relative-url-00.txt>
# Standard/builtin Python modules
import string
# A classification of schemes ('' means apply by default)
uses_relative = ['ftp', 'http', 'gopher', 'nntp', 'wais', 'file',
'prospero', '']
uses_netloc = ['ftp', 'http', 'gopher', 'nntp', 'telnet', 'wais',
'file', 'prospero', '']
non_hierarchical = ['gopher', 'mailto', 'news', 'telnet', 'wais']
uses_params = ['ftp', 'prospero', '']
uses_query = ['http', 'wais', '']
uses_fragment = ['ftp', 'http', 'gopher', 'news', 'nntp', 'wais',
'file', 'prospero', '']
# Characters valid in scheme names
scheme_chars = string.letters + string.digits + '+-.'
# Parse a URL into 6 components:
# <scheme>://<netloc>/<path>;<params>?<query>#<fragment>
# Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
# Note that we don't break the components up in smaller bits
# (e.g. netloc is a single string) and we don't expand % escapes.
def urlparse(url, scheme = '', allow_framents = 1):
netloc = ''
path = ''
params = ''
query = ''
fragment = ''
i = string.find(url, ':')
if i > 0:
for c in url[:i]:
if c not in scheme_chars:
break
else:
scheme, url = string.lower(url[:i]), url[i+1:]
if scheme in uses_netloc:
if url[:2] == '//':
i = string.find(url, '/', 2)
if i < 0:
i = len(url)
netloc, url = url[2:i], url[i:]
if allow_framents and scheme in uses_fragment:
i = string.rfind(url, '#')
if i >= 0:
url, fragment = url[:i], url[i+1:]
if scheme in uses_query:
i = string.find(url, '?')
if i >= 0:
url, query = url[:i], url[i+1:]
if scheme in uses_params:
i = string.find(url, ';')
if i >= 0:
url, params = url[:i], url[i+1:]
return scheme, netloc, url, params, query, fragment
# Put a parsed URL back together again. This may result in a slightly
# different, but equivalent URL, if the URL that was parsed originally
# had redundant delimiters, e.g. a ? with an empty query (the draft
# states that these are equivalent).
def urlunparse((scheme, netloc, url, params, query, fragment)):
if netloc:
url = '//' + netloc + url
if scheme:
url = scheme + ':' + url
if params:
url = url + ';' + params
if query:
url = url + '?' + query
if fragment:
url = url + '#' + fragment
return url
# Join a base URL and a possibly relative URL to form an absolute
# interpretation of the latter.
def urljoin(base, url, allow_framents = 1):
if not base:
return url
bscheme, bnetloc, bpath, bparams, bquery, bfragment = \
urlparse(base, '', allow_framents)
scheme, netloc, path, params, query, fragment = \
urlparse(url, bscheme, allow_framents)
if scheme != bscheme or scheme not in uses_relative:
return urlunparse((scheme, netloc, path,
params, query, fragment))
if scheme in uses_netloc:
if netloc:
return urlunparse((scheme, netloc, path,
params, query, fragment))
netloc = bnetloc
if path[:1] == '/':
return urlunparse((scheme, netloc, path,
params, query, fragment))
if not path:
path = bpath
if not query:
query = bquery
return urlunparse((scheme, netloc, path,
params, query, fragment))
i = string.rfind(bpath, '/')
if i < 0:
i = len(bpath)
path = bpath[:i] + '/' + path
segments = string.splitfields(path, '/')
if segments[-1] == '.':
segments[-1] = ''
while '.' in segments:
segments.remove('.')
while 1:
i = 1
n = len(segments) - 1
while i < n:
if segments[i] == '..' and segments[i-1]:
del segments[i-1:i+1]
break
i = i+1
else:
break
if len(segments) >= 2 and segments[-1] == '..':
segments[-2:] = ['']
path = string.joinfields(segments, '/')
return urlunparse((scheme, netloc, path,
params, query, fragment))
test_input = """
http://a/b/c/d
g:h = <URL:g:h>
http:g = <URL:http://a/b/c/g>
http: = <URL:http://a/b/c/d>
g = <URL:http://a/b/c/g>
./g = <URL:http://a/b/c/g>
g/ = <URL:http://a/b/c/g/>
/g = <URL:http://a/g>
//g = <URL:http://g>
?y = <URL:http://a/b/c/d?y>
g?y = <URL:http://a/b/c/g?y>
g?y/./x = <URL:http://a/b/c/g?y/./x>
. = <URL:http://a/b/c/>
./ = <URL:http://a/b/c/>
.. = <URL:http://a/b/>
../ = <URL:http://a/b/>
../g = <URL:http://a/b/g>
../.. = <URL:http://a/>
../../g = <URL:http://a/g>
../../../g = <URL:http://a/../g>
./../g = <URL:http://a/b/g>
./g/. = <URL:http://a/b/c/g/>
/./g = <URL:http://a/./g>
g/./h = <URL:http://a/b/c/g/h>
g/../h = <URL:http://a/b/c/h>
http:g = <URL:http://a/b/c/g>
http: = <URL:http://a/b/c/d>
"""
def test():
import sys
base = ''
if sys.argv[1:]:
fn = sys.argv[1]
if fn == '-':
fp = sys.stdin
else:
fp = open(fn)
else:
import StringIO
fp = StringIO.StringIO(test_input)
while 1:
line = fp.readline()
if not line: break
words = string.split(line)
if not words:
continue
url = words[0]
parts = urlparse(url)
print '%-10s : %s' % (url, parts)
abs = urljoin(base, url)
if not base:
base = abs
wrapped = '<URL:%s>' % abs
print '%-10s = %s' % (url, wrapped)
if len(words) == 3 and words[1] == '=':
if wrapped != words[2]:
print 'EXPECTED', words[2], '!!!!!!!!!!'
if __name__ == '__main__':
test()