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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")
"""
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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