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v0.5.1
v0.5.1
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Tip revision: 84332f91ee463d2e097342964ec304a7c902c1e6 authored by Anthony Baxter on 10 October 2006, 17:28:33 UTC
what month is it again? I get confused...
what month is it again? I get confused...
Tip revision: 84332f9
varsubst.py
#
# Variable substitution. Variables are $delimited$
#
import re
error = 'varsubst.error'
class Varsubst:
def __init__(self, dict):
self.dict = dict
self.prog = re.compile('\$([a-zA-Z0-9_]*)\$')
self.do_useindent = 0
def useindent(self, onoff):
self.do_useindent = onoff
def subst(self, s):
rv = ''
while 1:
m = self.prog.search(s)
if not m:
return rv + s
rv = rv + s[:m.start()]
s = s[m.end():]
if m.end() - m.start() == 2:
# Escaped dollar
rv = rv + '$'
s = s[2:]
continue
name = m.group(1)
if not self.dict.has_key(name):
raise error, 'No such variable: '+name
value = self.dict[name]
if self.do_useindent and '\n' in value:
value = self._modindent(value, rv)
rv = rv + value
def _modindent(self, value, old):
lastnl = old.rfind('\n', 0) + 1
lastnl = len(old) - lastnl
sub = '\n' + (' '*lastnl)
return re.sub('\n', sub, value)
def _test():
import sys
import os
sys.stderr.write('-- Copying stdin to stdout with environment map --\n')
c = Varsubst(os.environ)
c.useindent(1)
d = sys.stdin.read()
sys.stdout.write(c.subst(d))
sys.exit(1)
if __name__ == '__main__':
_test()