mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-12-29 15:26:05 +00:00
efa0f19836
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@40522 a592a061-630c-0410-9148-cb99ea01b6c8
454 lines
14 KiB
Python
454 lines
14 KiB
Python
# This file is part of lyx2lyx
|
|
# -*- coding: utf-8 -*-
|
|
# Copyright (C) 2002-2011 Dekel Tsur <dekel@lyx.org>,
|
|
# José Matos <jamatos@lyx.org>, Richard Heck <rgheck@comcast.net>
|
|
#
|
|
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
|
|
'''
|
|
This modules offer several free functions to help parse lines.
|
|
More documentaton is below, but here is a quick guide to what
|
|
they do. Optional arguments are marked by brackets.
|
|
|
|
find_token(lines, token, start[, end[, ignorews]]):
|
|
Returns the first line i, start <= i < end, on which
|
|
token is found at the beginning. Returns -1 if not
|
|
found.
|
|
If ignorews is (given and) True, then differences
|
|
in whitespace do not count, except that there must be no
|
|
extra whitespace following token itself.
|
|
|
|
find_token_exact(lines, token, start[, end]):
|
|
As find_token, but with ignorews True.
|
|
|
|
find_tokens(lines, tokens, start[, end[, ignorews]]):
|
|
Returns the first line i, start <= i < end, on which
|
|
oen of the tokens in tokens is found at the beginning.
|
|
Returns -1 if not found.
|
|
If ignorews is (given and) True, then differences
|
|
in whitespace do not count, except that there must be no
|
|
extra whitespace following token itself.
|
|
|
|
find_tokens_exact(lines, token, start[, end]):
|
|
As find_tokens, but with ignorews True.
|
|
|
|
find_token_backwards(lines, token, start):
|
|
find_tokens_backwards(lines, tokens, start):
|
|
As before, but look backwards.
|
|
|
|
find_re(lines, rexp, start[, end]):
|
|
As find_token, but rexp is a regular expression object,
|
|
so it has to be passed as e.g.: re.compile(r'...').
|
|
|
|
get_value(lines, token, start[, end[, default]):
|
|
Similar to find_token, but it returns what follows the
|
|
token on the found line. Example:
|
|
get_value(document.header, "\use_xetex", 0)
|
|
will find a line like:
|
|
\use_xetex true
|
|
and, in that case, return "true". (Note that whitespace
|
|
is stripped.) The final argument, default, defaults to "",
|
|
and is what is returned if we do not find anything. So you
|
|
can use that to set a default.
|
|
|
|
get_quoted_value(lines, token, start[, end[, default]):
|
|
Similar to get_value, but it will strip quotes off the
|
|
value, if they are present. So use this one for cases
|
|
where the value is normally quoted.
|
|
|
|
get_option_value(line, option):
|
|
This assumes we have a line with something like:
|
|
option="value"
|
|
and returns value. Returns "" if not found.
|
|
|
|
del_token(lines, token, start[, end]):
|
|
Like find_token, but deletes the line if it finds one.
|
|
Returns True if a line got deleted, otherwise False.
|
|
|
|
find_beginning_of(lines, i, start_token, end_token):
|
|
Here, start_token and end_token are meant to be a matching
|
|
pair, like "\begin_layout" and "\end_layout". We look for
|
|
the start_token that pairs with the end_token that occurs
|
|
on or after line i. Returns -1 if not found.
|
|
So, in the layout case, this would find the \begin_layout
|
|
for the layout line i is in.
|
|
Example:
|
|
ec = find_token(document.body, "</cell", i)
|
|
bc = find_beginning_of(document.body, ec, \
|
|
"<cell", "</cell")
|
|
Now, assuming no -1s, bc-ec wraps the cell for line i.
|
|
|
|
find_end_of(lines, i, start_token, end_token):
|
|
Like find_beginning_of, but looking for the matching
|
|
end_token. This might look like:
|
|
bc = find_token_(document.body, "<cell", i)
|
|
ec = find_end_of(document.body, bc, "<cell", "</cell")
|
|
Now, assuming no -1s, bc-ec wrap the next cell.
|
|
|
|
find_end_of_inset(lines, i):
|
|
Specialization of find_end_of for insets.
|
|
|
|
find_end_of_layout(lines, i):
|
|
Specialization of find_end_of for layouts.
|
|
|
|
is_in_inset(lines, i, inset):
|
|
Checks if line i is in an inset of the given type.
|
|
If so, returns starting and ending lines. Otherwise,
|
|
returns False.
|
|
Example:
|
|
is_in_inset(document.body, i, "\\begin_inset Tabular")
|
|
returns False unless i is within a table. If it is, then
|
|
it returns the line on which the table begins and the one
|
|
on which it ends. Note that this pair will evaulate to
|
|
boolean True, so
|
|
if is_in_inset(...):
|
|
will do what you expect.
|
|
|
|
get_containing_inset(lines, i):
|
|
Finds out what kind of inset line i is within. Returns a
|
|
list containing what follows \begin_inset on the the line
|
|
on which the inset begins, plus the starting and ending line.
|
|
Returns False on any kind of error or if it isn't in an inset.
|
|
So get_containing_inset(document.body, i) might return:
|
|
("CommandInset ref", 300, 306)
|
|
if i is within an InsetRef beginning on line 300 and ending
|
|
on line 306.
|
|
|
|
get_containing_layout(lines, i):
|
|
As get_containing_inset, but for layout.
|
|
|
|
|
|
find_nonempty_line(lines, start[, end):
|
|
Finds the next non-empty line.
|
|
|
|
check_token(line, token):
|
|
Does line begin with token?
|
|
|
|
is_nonempty_line(line):
|
|
Does line contain something besides whitespace?
|
|
|
|
'''
|
|
|
|
import re
|
|
|
|
# Utilities for one line
|
|
def check_token(line, token):
|
|
""" check_token(line, token) -> bool
|
|
|
|
Return True if token is present in line and is the first element
|
|
else returns False."""
|
|
|
|
return line[:len(token)] == token
|
|
|
|
|
|
def is_nonempty_line(line):
|
|
""" is_nonempty_line(line) -> bool
|
|
|
|
Return False if line is either empty or it has only whitespaces,
|
|
else return True."""
|
|
return line != " "*len(line)
|
|
|
|
|
|
# Utilities for a list of lines
|
|
def find_token(lines, token, start, end = 0, ignorews = False):
|
|
""" find_token(lines, token, start[[, end], ignorews]) -> int
|
|
|
|
Return the lowest line where token is found, and is the first
|
|
element, in lines[start, end].
|
|
|
|
If ignorews is True (default is False), then differences in
|
|
whitespace are ignored, except that there must be no extra
|
|
whitespace following token itself.
|
|
|
|
Return -1 on failure."""
|
|
|
|
if end == 0 or end > len(lines):
|
|
end = len(lines)
|
|
m = len(token)
|
|
for i in xrange(start, end):
|
|
if ignorews:
|
|
x = lines[i].split()
|
|
y = token.split()
|
|
if len(x) < len(y):
|
|
continue
|
|
if x[:len(y)] == y:
|
|
return i
|
|
else:
|
|
if lines[i][:m] == token:
|
|
return i
|
|
return -1
|
|
|
|
|
|
def find_token_exact(lines, token, start, end = 0):
|
|
return find_token(lines, token, start, end, True)
|
|
|
|
|
|
def find_tokens(lines, tokens, start, end = 0, ignorews = False):
|
|
""" find_tokens(lines, tokens, start[[, end], ignorews]) -> int
|
|
|
|
Return the lowest line where one token in tokens is found, and is
|
|
the first element, in lines[start, end].
|
|
|
|
Return -1 on failure."""
|
|
if end == 0 or end > len(lines):
|
|
end = len(lines)
|
|
|
|
for i in xrange(start, end):
|
|
for token in tokens:
|
|
if ignorews:
|
|
x = lines[i].split()
|
|
y = token.split()
|
|
if len(x) < len(y):
|
|
continue
|
|
if x[:len(y)] == y:
|
|
return i
|
|
else:
|
|
if lines[i][:len(token)] == token:
|
|
return i
|
|
return -1
|
|
|
|
|
|
def find_tokens_exact(lines, tokens, start, end = 0):
|
|
return find_tokens(lines, tokens, start, end, True)
|
|
|
|
|
|
def find_re(lines, rexp, start, end = 0):
|
|
""" find_token_re(lines, rexp, start[, end]) -> int
|
|
|
|
Return the lowest line where rexp, a regular expression, is found
|
|
in lines[start, end].
|
|
|
|
Return -1 on failure."""
|
|
|
|
if end == 0 or end > len(lines):
|
|
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):
|
|
""" find_token_backwards(lines, token, start) -> int
|
|
|
|
Return the highest line where token is found, and is the first
|
|
element, in lines[start, end].
|
|
|
|
Return -1 on failure."""
|
|
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):
|
|
""" find_tokens_backwards(lines, token, start) -> int
|
|
|
|
Return the highest line where token is found, and is the first
|
|
element, in lines[end, start].
|
|
|
|
Return -1 on failure."""
|
|
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, default = ""):
|
|
""" get_value(lines, token, start[[, end], default]) -> string
|
|
|
|
Find the next line that looks like:
|
|
token followed by other stuff
|
|
Returns "followed by other stuff" with leading and trailing
|
|
whitespace removed.
|
|
"""
|
|
|
|
i = find_token_exact(lines, token, start, end)
|
|
if i == -1:
|
|
return default
|
|
l = lines[i].split(None, 1)
|
|
if len(l) > 1:
|
|
return l[1].strip()
|
|
return default
|
|
|
|
|
|
def get_quoted_value(lines, token, start, end = 0, default = ""):
|
|
""" get_quoted_value(lines, token, start[[, end], default]) -> string
|
|
|
|
Find the next line that looks like:
|
|
token "followed by other stuff"
|
|
Returns "followed by other stuff" with leading and trailing
|
|
whitespace and quotes removed. If there are no quotes, that is OK too.
|
|
So use get_value to preserve possible quotes, this one to remove them,
|
|
if they are there.
|
|
Note that we will NOT strip quotes from default!
|
|
"""
|
|
val = get_value(lines, token, start, end, "")
|
|
if not val:
|
|
return default
|
|
return val.strip('"')
|
|
|
|
|
|
def get_option_value(line, option):
|
|
rx = option + '\s*=\s*"([^"]+)"'
|
|
rx = re.compile(rx)
|
|
m = rx.search(line)
|
|
if not m:
|
|
return ""
|
|
return m.group(1)
|
|
|
|
|
|
def set_option_value(line, option, value):
|
|
rx = '(' + option + '\s*=\s*")[^"]+"'
|
|
rx = re.compile(rx)
|
|
m = rx.search(line)
|
|
if not m:
|
|
return line
|
|
return re.sub(rx, '\g<1>' + value + '"', line)
|
|
|
|
|
|
def del_token(lines, token, start, end = 0):
|
|
""" del_token(lines, token, start, end) -> int
|
|
|
|
Find the first line in lines where token is the first element
|
|
and delete that line. Returns True if we deleted a line, False
|
|
if we did not."""
|
|
|
|
k = find_token_exact(lines, token, start, end)
|
|
if k == -1:
|
|
return False
|
|
del lines[k]
|
|
return True
|
|
|
|
|
|
def find_beginning_of(lines, i, start_token, end_token):
|
|
count = 1
|
|
while i > 0:
|
|
i = find_tokens_backwards(lines, [start_token, end_token], i-1)
|
|
if i == -1:
|
|
return -1
|
|
if check_token(lines[i], end_token):
|
|
count = count+1
|
|
else:
|
|
count = count-1
|
|
if count == 0:
|
|
return i
|
|
return -1
|
|
|
|
|
|
def find_end_of(lines, i, start_token, end_token):
|
|
count = 1
|
|
n = len(lines)
|
|
while i < n:
|
|
i = find_tokens(lines, [end_token, start_token], i+1)
|
|
if i == -1:
|
|
return -1
|
|
if check_token(lines[i], start_token):
|
|
count = count+1
|
|
else:
|
|
count = count-1
|
|
if count == 0:
|
|
return i
|
|
return -1
|
|
|
|
|
|
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 find_end_of_inset(lines, i):
|
|
" Find end of inset, where lines[i] is included."
|
|
return find_end_of(lines, i, "\\begin_inset", "\\end_inset")
|
|
|
|
|
|
def find_end_of_layout(lines, i):
|
|
" Find end of layout, where lines[i] is included."
|
|
return find_end_of(lines, i, "\\begin_layout", "\\end_layout")
|
|
|
|
|
|
def is_in_inset(lines, i, inset):
|
|
'''
|
|
Checks if line i is in an inset of the given type.
|
|
If so, returns starting and ending lines.
|
|
Otherwise, returns False.
|
|
Example:
|
|
is_in_inset(document.body, i, "\\begin_inset Tabular")
|
|
returns False unless i is within a table. If it is, then
|
|
it returns the line on which the table begins and the one
|
|
on which it ends. Note that this pair will evaulate to
|
|
boolean True, so
|
|
if is_in_inset(...):
|
|
will do what you expect.
|
|
'''
|
|
defval = (-1, -1)
|
|
stins = find_token_backwards(lines, inset, i)
|
|
if stins == -1:
|
|
return defval
|
|
endins = find_end_of_inset(lines, stins)
|
|
# note that this includes the notfound case.
|
|
if endins < i:
|
|
return defval
|
|
return (stins, endins)
|
|
|
|
|
|
def get_containing_inset(lines, i):
|
|
'''
|
|
Finds out what kind of inset line i is within. Returns a
|
|
list containing (i) what follows \begin_inset on the the line
|
|
on which the inset begins, plus the starting and ending line.
|
|
Returns False on any kind of error or if it isn't in an inset.
|
|
'''
|
|
stins = find_token_backwards(lines, i, "\\begin_inset")
|
|
if stins == -1:
|
|
return False
|
|
endins = find_end_of_inset(lines, stins)
|
|
if endins < i:
|
|
return False
|
|
inset = get_value(lines, "\\begin_inset", stins)
|
|
if inset == "":
|
|
# shouldn't happen
|
|
return False
|
|
return (inset, stins, endins)
|
|
|
|
|
|
def get_containing_layout(lines, i):
|
|
'''
|
|
Finds out what kind of layout line i is within. Returns a
|
|
list containing (i) what follows \begin_layout on the the line
|
|
on which the layout begins, plus the starting and ending line.
|
|
Returns False on any kind of error.
|
|
'''
|
|
stins = find_token_backwards(lines, i, "\\begin_layout")
|
|
if stins == -1:
|
|
return False
|
|
endins = find_end_of_layout(lines, stins)
|
|
if endins < i:
|
|
return False
|
|
lay = get_value(lines, "\\begin_layout", stins)
|
|
if lay == "":
|
|
# shouldn't happen
|
|
return False
|
|
return (lay, stins, endins)
|