# This file is part of lyx2lyx
# Copyright (C) 2002 Dekel Tsur <dekel@lyx.org>, José Matos <jamatos@lyx.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

import string

def check_token(line, token):
    if line[:len(token)] == token:
	return 1
    return 0

# We need to check that the char after the token is space, but I think
# we can ignore this
def find_token(lines, token, start, end = 0):
    if end == 0:
	end = len(lines)
    m = len(token)
    for i in xrange(start, end):
	if lines[i][:m] == token:
	    return i
    return -1

def find_tokens(lines, tokens, start, end = 0):
    if end == 0:
	end = len(lines)
    for i in xrange(start, end):
	line = lines[i]
	for token in tokens:
	    if line[:len(token)] == token:
		return i
    return -1

def find_re(lines, rexp, start, end = 0):
    if end == 0:
	end = len(lines)
    for i in xrange(start, end):
	if rexp.match(lines[i]):
		return i
    return -1

def find_token_backwards(lines, token, start):
    m = len(token)
    for i in xrange(start, -1, -1):
	line = lines[i]
	if line[:m] == token:
	    return i
    return -1

def find_tokens_backwards(lines, tokens, start):
    for i in xrange(start, -1, -1):
	line = lines[i]
	for token in tokens:
	    if line[:len(token)] == token:
		return i
    return -1

def get_value(lines, token, start, end = 0):
    i = find_token(lines, token, start, end)
    if i == -1:
	return ""
    return string.split(lines[i])[1]

# Finds the paragraph that contains line i.
def get_paragraph(lines, i):
    while 1:
	i = find_tokens_backwards(lines, ["\\end_inset", "\\layout"], i)
	if check_token(lines[i], "\\layout"):
	    return i
	i = find_beginning_of_inset(lines, i)

# Finds the paragraph after the paragraph that contains line i.
def get_next_paragraph(lines, i):
    while 1:
	i = find_tokens(lines, ["\\begin_inset", "\\layout"], i)
	if check_token(lines[i], "\\layout"):
	    return i
	i = find_end_of_inset(lines, i)

# Finds the matching \end_inset
def find_end_of_inset(lines, i):
    count = 1
    while 1:
	i = find_tokens(lines, ["\\end_inset", "\\begin_inset"], i+1)
	if check_token(lines[i], "\\begin_inset"):
	    count = count+1
	else:
	    count = count-1
	if count == 0:
	    return i

# Finds the matching \end_inset
def find_beginning_of_inset(lines, i):
    count = 1
    while 1:
	i = find_tokens_backwards(lines, ["\\end_inset", "\\begin_inset"], i-1)
	if check_token(lines[i], "\\end_inset"):
	    count = count+1
	else:
	    count = count-1
	if count == 0:
	    return i

def is_nonempty_line(line):
    return line != " "*len(line)

def find_nonempty_line(lines, start, end = 0):
    if end == 0:
	end = len(lines)
    for i in xrange(start, end):
	if is_nonempty_line(lines[i]):
	    return i
    return -1

def set_comment(lines, number):
    x = int(number)
    if x < 216:
	# It is not worth the trouble to handle this case
	return
    elif x < 220:
	version = "1.1"
    else:
	version = "1.2"

    lines[0] = "#LyX %s created this file. For more info see http://www.lyx.org/" % version
    if lines[1][0] == '#':
	del lines[1]

def set_format(lines, number):
    if int(number) <= 217:
	number = float(number)/100
    i = find_token(lines, "\\lyxformat", 0)
    lines[i] = "\\lyxformat %s" % number