#---------- logical_lines.py----------#
# Determine the logical lines in a file that might have
# continuation characters.  'logical_lines()' returns a
# list.  The self-test prints the logical lines as
# physical lines (for all specified files and options).

import re

def logical_lines(s, continuation='\\', strip_trailing_space=0):
    c = continuation
    if strip_trailing_space:
        s = re.sub(r'(?m)(%s)(\s+)$'%[c], r'\1', s)
    pat_log = r'(?sm)^.*?$(?<!%s)'%[c]  # e.g. (?sm)^.*?$(?<!\\)
    return [t.replace(c+'\n','') for t in re.findall(pat_log, s)]

if __name__ == '__main__':
    import sys
    files, strip, contin = ([], 0, '\\')
    for arg in sys.argv[1:]:
        if arg[:-1] == '--continue=': contin = arg[-1]
        elif arg[:-1] == '-c': contin = arg[-1]
        elif arg in ('--string','-s'): strip = 1
        else: files.append(arg)
    if not files: files.append(sys.stdin)
    for file in files:
        s = open(sys.argv[1]).read()
        print '\n'.join(logical_lines(s, contin, strip))