mirror of
https://git.lyx.org/repos/lyx.git
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afac0c997a
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@38487 a592a061-630c-0410-9148-cb99ea01b6c8
445 lines
14 KiB
Python
445 lines
14 KiB
Python
# This file is part of lyx2lyx
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# -*- coding: utf-8 -*-
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# Copyright (C) 2002-2011 Dekel Tsur <dekel@lyx.org>,
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# José Matos <jamatos@lyx.org>, Richard Heck <rgheck@comcast.net>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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'''
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This modules offer several free functions to help parse lines.
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More documentaton is below, but here is a quick guide to what
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they do. Optional arguments are marked by brackets.
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find_token(lines, token, start[, end[, ignorews]]):
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Returns the first line i, start <= i < end, on which
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token is found at the beginning. Returns -1 if not
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found.
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If ignorews is (given and) True, then differences
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in whitespace do not count, except that there must be no
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extra whitespace following token itself.
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find_token_exact(lines, token, start[, end]):
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As find_token, but with ignorews True.
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find_tokens(lines, tokens, start[, end[, ignorews]]):
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Returns the first line i, start <= i < end, on which
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oen of the tokens in tokens is found at the beginning.
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Returns -1 if not found.
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If ignorews is (given and) True, then differences
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in whitespace do not count, except that there must be no
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extra whitespace following token itself.
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find_tokens_exact(lines, token, start[, end]):
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As find_tokens, but with ignorews True.
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find_token_backwards(lines, token, start):
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find_tokens_backwards(lines, tokens, start):
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As before, but look backwards.
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find_re(lines, rexp, start[, end]):
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As find_token, but rexp is a regular expression object,
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so it has to be passed as e.g.: re.compile(r'...').
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get_value(lines, token, start[, end[, default]):
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Similar to find_token, but it returns what follows the
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token on the found line. Example:
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get_value(document.header, "\use_xetex", 0)
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will find a line like:
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\use_xetex true
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and, in that case, return "true". (Note that whitespace
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is stripped.) The final argument, default, defaults to "",
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and is what is returned if we do not find anything. So you
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can use that to set a default.
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get_quoted_value(lines, token, start[, end[, default]):
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Similar to get_value, but it will strip quotes off the
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value, if they are present. So use this one for cases
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where the value is normally quoted.
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get_option_value(line, option):
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This assumes we have a line with something like:
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option="value"
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and returns value. Returns "" if not found.
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del_token(lines, token, start[, end]):
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Like find_token, but deletes the line if it finds one.
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Returns True if a line got deleted, otherwise False.
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find_beginning_of(lines, i, start_token, end_token):
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Here, start_token and end_token are meant to be a matching
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pair, like "\begin_layout" and "\end_layout". We look for
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the start_token that pairs with the end_token that occurs
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on or after line i. Returns -1 if not found.
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So, in the layout case, this would find the \begin_layout
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for the layout line i is in.
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Example:
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ec = find_token(document.body, "</cell", i)
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bc = find_beginning_of(document.body, ec, \
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"<cell", "</cell")
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Now, assuming no -1s, bc-ec wraps the cell for line i.
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find_end_of(lines, i, start_token, end_token):
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Like find_beginning_of, but looking for the matching
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end_token. This might look like:
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bc = find_token_(document.body, "<cell", i)
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ec = find_end_of(document.body, bc, "<cell", "</cell")
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Now, assuming no -1s, bc-ec wrap the next cell.
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find_end_of_inset(lines, i):
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Specialization of find_end_of for insets.
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find_end_of_layout(lines, i):
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Specialization of find_end_of for layouts.
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is_in_inset(lines, i, inset):
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Checks if line i is in an inset of the given type.
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If so, returns starting and ending lines. Otherwise,
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returns False.
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Example:
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is_in_inset(document.body, i, "\\begin_inset Tabular")
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returns False unless i is within a table. If it is, then
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it returns the line on which the table begins and the one
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on which it ends. Note that this pair will evaulate to
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boolean True, so
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if is_in_inset(...):
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will do what you expect.
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get_containing_inset(lines, i):
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Finds out what kind of inset line i is within. Returns a
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list containing what follows \begin_inset on the the line
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on which the inset begins, plus the starting and ending line.
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Returns False on any kind of error or if it isn't in an inset.
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So get_containing_inset(document.body, i) might return:
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("CommandInset ref", 300, 306)
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if i is within an InsetRef beginning on line 300 and ending
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on line 306.
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get_containing_layout(lines, i):
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As get_containing_inset, but for layout.
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find_nonempty_line(lines, start[, end):
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Finds the next non-empty line.
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check_token(line, token):
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Does line begin with token?
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is_nonempty_line(line):
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Does line contain something besides whitespace?
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'''
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import re
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# Utilities for one line
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def check_token(line, token):
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""" check_token(line, token) -> bool
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Return True if token is present in line and is the first element
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else returns False."""
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return line[:len(token)] == token
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def is_nonempty_line(line):
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""" is_nonempty_line(line) -> bool
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Return False if line is either empty or it has only whitespaces,
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else return True."""
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return line != " "*len(line)
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# Utilities for a list of lines
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def find_token(lines, token, start, end = 0, ignorews = False):
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""" find_token(lines, token, start[[, end], ignorews]) -> int
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Return the lowest line where token is found, and is the first
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element, in lines[start, end].
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If ignorews is True (default is False), then differences in
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whitespace are ignored, except that there must be no extra
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whitespace following token itself.
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Return -1 on failure."""
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if end == 0 or end > len(lines):
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end = len(lines)
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m = len(token)
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for i in xrange(start, end):
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if ignorews:
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x = lines[i].split()
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y = token.split()
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if len(x) < len(y):
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continue
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if x[:len(y)] == y:
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return i
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else:
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if lines[i][:m] == token:
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return i
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return -1
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def find_token_exact(lines, token, start, end = 0):
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return find_token(lines, token, start, end, True)
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def find_tokens(lines, tokens, start, end = 0, ignorews = False):
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""" find_tokens(lines, tokens, start[[, end], ignorews]) -> int
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Return the lowest line where one token in tokens is found, and is
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the first element, in lines[start, end].
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Return -1 on failure."""
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if end == 0 or end > len(lines):
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end = len(lines)
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for i in xrange(start, end):
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for token in tokens:
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if ignorews:
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x = lines[i].split()
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y = token.split()
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if len(x) < len(y):
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continue
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if x[:len(y)] == y:
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return i
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else:
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if lines[i][:len(token)] == token:
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return i
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return -1
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def find_tokens_exact(lines, tokens, start, end = 0):
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return find_tokens(lines, tokens, start, end, True)
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def find_re(lines, rexp, start, end = 0):
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""" find_token_re(lines, rexp, start[, end]) -> int
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Return the lowest line where rexp, a regular expression, is found
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in lines[start, end].
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Return -1 on failure."""
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if end == 0 or end > len(lines):
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end = len(lines)
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for i in xrange(start, end):
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if rexp.match(lines[i]):
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return i
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return -1
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def find_token_backwards(lines, token, start):
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""" find_token_backwards(lines, token, start) -> int
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Return the highest line where token is found, and is the first
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element, in lines[start, end].
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Return -1 on failure."""
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m = len(token)
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for i in xrange(start, -1, -1):
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line = lines[i]
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if line[:m] == token:
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return i
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return -1
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def find_tokens_backwards(lines, tokens, start):
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""" find_tokens_backwards(lines, token, start) -> int
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Return the highest line where token is found, and is the first
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element, in lines[end, start].
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Return -1 on failure."""
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for i in xrange(start, -1, -1):
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line = lines[i]
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for token in tokens:
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if line[:len(token)] == token:
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return i
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return -1
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def get_value(lines, token, start, end = 0, default = ""):
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""" get_value(lines, token, start[[, end], default]) -> string
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Find the next line that looks like:
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token followed by other stuff
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Returns "followed by other stuff" with leading and trailing
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whitespace removed.
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"""
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i = find_token_exact(lines, token, start, end)
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if i == -1:
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return default
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l = lines[i].split(None, 1)
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if len(l) > 1:
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return l[1].strip()
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return default
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def get_quoted_value(lines, token, start, end = 0, default = ""):
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""" get_quoted_value(lines, token, start[[, end], default]) -> string
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Find the next line that looks like:
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token "followed by other stuff"
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Returns "followed by other stuff" with leading and trailing
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whitespace and quotes removed. If there are no quotes, that is OK too.
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So use get_value to preserve possible quotes, this one to remove them,
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if they are there.
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Note that we will NOT strip quotes from default!
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"""
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val = get_value(lines, token, start, end, "")
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if not val:
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return default
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return val.strip('"')
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def get_option_value(line, option):
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rx = option + '\s*=\s*"([^"+])"'
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rx = re.compile(rx)
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m = rx.search(line)
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if not m:
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return ""
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return m.group(1)
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def del_token(lines, token, start, end = 0):
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""" del_token(lines, token, start, end) -> int
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Find the first line in lines where token is the first element
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and delete that line. Returns True if we deleted a line, False
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if we did not."""
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k = find_token_exact(lines, token, start, end)
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if k == -1:
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return False
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del lines[k]
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return True
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def find_beginning_of(lines, i, start_token, end_token):
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count = 1
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while i > 0:
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i = find_tokens_backwards(lines, [start_token, end_token], i-1)
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if i == -1:
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return -1
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if check_token(lines[i], end_token):
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count = count+1
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else:
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count = count-1
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if count == 0:
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return i
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return -1
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def find_end_of(lines, i, start_token, end_token):
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count = 1
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n = len(lines)
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while i < n:
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i = find_tokens(lines, [end_token, start_token], i+1)
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if i == -1:
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return -1
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if check_token(lines[i], start_token):
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count = count+1
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else:
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count = count-1
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if count == 0:
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return i
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return -1
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def find_nonempty_line(lines, start, end = 0):
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if end == 0:
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end = len(lines)
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for i in xrange(start, end):
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if is_nonempty_line(lines[i]):
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return i
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return -1
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def find_end_of_inset(lines, i):
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" Find end of inset, where lines[i] is included."
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return find_end_of(lines, i, "\\begin_inset", "\\end_inset")
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def find_end_of_layout(lines, i):
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" Find end of layout, where lines[i] is included."
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return find_end_of(lines, i, "\\begin_layout", "\\end_layout")
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def is_in_inset(lines, i, inset):
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'''
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Checks if line i is in an inset of the given type.
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If so, returns starting and ending lines.
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Otherwise, returns False.
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Example:
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is_in_inset(document.body, i, "\\begin_inset Tabular")
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returns False unless i is within a table. If it is, then
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it returns the line on which the table begins and the one
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on which it ends. Note that this pair will evaulate to
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boolean True, so
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if is_in_inset(...):
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will do what you expect.
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'''
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defval = (-1, -1)
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stins = find_token_backwards(lines, inset, i)
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if stins == -1:
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return defval
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endins = find_end_of_inset(lines, stins)
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# note that this includes the notfound case.
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if endins < i:
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return defval
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return (stins, endins)
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def get_containing_inset(lines, i):
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'''
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Finds out what kind of inset line i is within. Returns a
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list containing (i) what follows \begin_inset on the the line
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on which the inset begins, plus the starting and ending line.
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Returns False on any kind of error or if it isn't in an inset.
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'''
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stins = find_token_backwards(lines, i, "\\begin_inset")
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if stins == -1:
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return False
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endins = find_end_of_inset(lines, stins)
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if endins < i:
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return False
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inset = get_value(lines, "\\begin_inset", stins)
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if inset == "":
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# shouldn't happen
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return False
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return (inset, stins, endins)
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def get_containing_layout(lines, i):
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'''
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Finds out what kind of layout line i is within. Returns a
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list containing (i) what follows \begin_layout on the the line
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on which the layout begins, plus the starting and ending line.
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Returns False on any kind of error.
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'''
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stins = find_token_backwards(lines, i, "\\begin_layout")
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if stins == -1:
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return False
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endins = find_end_of_layout(lines, stins)
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if endins < i:
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return False
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lay = get_value(lines, "\\begin_layout", stins)
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if lay == "":
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# shouldn't happen
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return False
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return (lay, stins, endins)
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