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"""This represents a document with methods to allow easy editing.
Think 'sed', only more fun to use.
Example 1: Convert all python-style comments in a file to UPPERCASE.
This operates as a filter on stdin, so this needs a shell pipe.
cat myscript.py | upper_filter.py
import sys, pyed
pe = pyed()
pe.read(sys.stdin)
for pe in pe.match_lines('^\\s*#'):
pe.cur_line = pe.cur_line.upper()
print pe
Example 2: Edit an Apache2 httpd.conf file to turn on supplemental SSL configuration.
import pyed
pe = pyed()
pe.read("httpd.conf")
pe.first('#Include conf/extra/httpd-ssl.conf')
pe.cur_line = 'Include conf/extra/httpd-ssl.conf'
pe.write("httpd.conf")
PEXPECT LICENSE
This license is approved by the OSI and FSF as GPL-compatible.
http://opensource.org/licenses/isc-license.txt
Copyright (c) 2012, Noah Spurrier <noah@noah.org>
PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""
import re
class pyed (object):
def __init__ (self, new_str=None):
if new_str is not None:
self.lines = new_str.splitlines()
self.cur_line_num = 0
else:
self.lines = None
# force invalid line number
self.cur_line_num = None
def match_lines (self, pattern, beg=0, end=None):
"""This returns a generator that iterates this object
over the lines and yielding when a line matches the pattern.
Note that this generator mutates this object so that
the cur_line is changed to the line matching the pattern.
"""
p = re.compile (pattern)
if end is None:
end = len(self.lines)
for i in xrange (beg,end):
m = p.match(self.lines[i])
if m is not None:
self.cur_line_num = i
yield self
else:
# force invalid line number
cur_line_num = None
def match_lines_rev (self, pattern, beg=0, end=None):
"""This is similar to match_lines, but the order is reversed.
"""
p = re.compile (pattern)
if end is None:
end = len(self.lines)
for i in xrange (end-1,beg-1,-1):
m = p.match(self.lines[i])
if m is not None:
self.cur_line_num = i
yield self
else:
# force invalid line number
cur_line_num = None
def next (self):
self.cur_line_num = self.cur_line_num + 1
if self.cur_line_num >= len(self.lines):
self.cur_line_num = len(self.lines) - 1
return self.cur_line
def prev (self):
self.cur_line_num = self.cur_line_num - 1
if self.cur_line_num < 0:
self.cur_line_num = 0
return self.cur_line
def first (self, pattern=None):
if pattern is not None:
try:
return self.match_lines(pattern).next()
except StopIteration, e:
# force invalid line number
self.cur_line_num = None
return None
self.cur_line_num = 0
return self.cur_line
def last (self, pattern=None):
if pattern is not None:
try:
return self.match_lines_rev(pattern).next()
except StopIteration, e:
# force invalid line number
self.cur_line_num = None
return None
self.cur_line_num = len(self.lines) - 1
return self.cur_line
def insert (self, s=''):
"""This inserts the string as a new line before the current line number.
"""
self.lines.insert(self.cur_line_num, s)
def append (self, s=''):
"""Unlike list append, this appends after the current line number,
not at the end of the entire list.
"""
self.cur_line_num = self.cur_line_num + 1
self.lines.insert(self.cur_line_num, s)
def delete (self):
del self.cur_line
def read (self, file_holder):
"""This reads all the lines from a file. The file_holder may be
either a string filename or any object that supports "read()".
All previous lines are lost.
"""
if hasattr(file_holder, 'read') and callable(file_holder.read):
fin = file_holder
else:
fin = open (file_holder, 'rb')
data = fin.read()
self.lines = data.splitlines()
self.cur_line_num = 0
def write (self, file_holder):
"""This writes all the lines to a file. The file_holder may be
either a string filename or any object that supports "read()".
TODO: Make write be atomic using file move instead of overwrite.
"""
if hasattr(file_holder, 'write') and callable(file_holder.write):
fout = file_holder
else:
fout = open (file_holder, 'wb')
for l in self.lines:
fout.write(l)
fout.write('\n')
# the following are for smart properties.
def __str__ (self):
return '\n'.join(self.lines)
def __get_cur_line (self):
self.__cur_line = self.lines[self.cur_line_num]
return self.__cur_line
def __set_cur_line (self, value):
self.__cur_line = value
self.lines[self.cur_line_num] = self.__cur_line
def __del_cur_line (self):
del self.lines[self.cur_line_num]
if self.cur_line_num >= len(self.lines):
self.cur_line_num = len(self.lines) - 1
cur_line = property (__get_cur_line, __set_cur_line, __del_cur_line)
# lines = property (get_lines, set_lines, del_lines)
__NOT_USED ="""
import sys
pe = pyed()
pe.read(sys.stdin)
#print "---"
#print list(x.cur_line for x in pe.match_lines_rev('^#'))
#print pe.first('^#')
#print pe.last('^#')
#print "---"
for pe in pe.match_lines('^\\s*#'):
pe.cur_line = pe.cur_line.lower()
pe.last('# comment.*')
pe.cur_line = '# Comment 1'
print pe
if pe.last('asdfasdf') is None:
print "can't find 'asdfasdf'"
"""
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