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teletype.py
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1 # -*- coding: utf-8 -*-
2 #
3 # Create and extract text from ODF, handling whitespace correctly.
4 # Copyright (C) 2008 J. David Eisenberg
5 #
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
10 #
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
15 #
16 # You should have received a copy of the GNU General Public License along
17 # with this program; if not, write to the Free Software Foundation, Inc.,
18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19
20
21 ##
22 #
23 # Class for handling whitespace properly in OpenDocument.
24 #
25 # While it is possible to use getTextContent() and setTextContent()
26 # to extract or create ODF content, these won't extract or create
27 # the appropriate <text:s>, <text:tab>, or <text:line-break>
28 # elements. This module takes care of that problem.
29 #
30
31 from odf.element import Node
32 import odf.opendocument
33 from odf.text import S,LineBreak,Tab
34
35 class WhitespaceText(object):
36
37 def __init__(self):
38 self.textBuffer = []
39 self.spaceCount = 0
40
41 ##
42 # Process an input string, inserting
43 # <text:tab> elements for '\t',
44 # <text:line-break> elements for '\n', and
45 # <text:s> elements for runs of more than one blank.
46 # These will be added to the given element.
47 #
48 def addTextToElement(self, odfElement, s):
49 i = 0
50 ch = ' '
51
52 # When we encounter a tab or newline, we can immediately
53 # dump any accumulated text and then emit the appropriate
54 # ODF element.
55 #
56 # When we encounter a space, we add it to the text buffer,
57 # and then collect more spaces. If there are more spaces
58 # after the first one, we dump the text buffer and then
59 # then emit the appropriate <text:s> element.
60
61 while i < len(s):
62 ch = s[i]
63 if ch == '\t':
64 self._emitTextBuffer(odfElement)
65 odfElement.addElement(Tab())
66 i += 1
67 elif ch == '\n':
68 self._emitTextBuffer(odfElement);
69 odfElement.addElement(LineBreak())
70 i += 1
71 elif ch == ' ':
72 self.textBuffer.append(' ')
73 i += 1
74 self.spaceCount = 0
75 while i < len(s) and (s[i] == ' '):
76 self.spaceCount += 1
77 i += 1
78 if self.spaceCount > 0:
79 self._emitTextBuffer(odfElement)
80 self._emitSpaces(odfElement)
81 else:
82 self.textBuffer.append(ch)
83 i += 1
84
85 self._emitTextBuffer(odfElement)
86
87 ##
88 # Creates a Text Node whose contents are the current textBuffer.
89 # Side effect: clears the text buffer.
90 #
91 def _emitTextBuffer(self, odfElement):
92 if len(self.textBuffer) > 0:
93 odfElement.addText(''.join(self.textBuffer))
94 self.textBuffer = []
95
96
97 ##
98 # Creates a <text:s> element for the current spaceCount.
99 # Side effect: sets spaceCount back to zero
100 #
101 def _emitSpaces(self, odfElement):
102 if self.spaceCount > 0:
103 spaceElement = S(c=self.spaceCount)
104 odfElement.addElement(spaceElement)
105 self.spaceCount = 0
106
107 def addTextToElement(odfElement, s):
108 wst = WhitespaceText()
109 wst.addTextToElement(odfElement, s)
110
111 ##
112 # Extract text content from an Element, with whitespace represented
113 # properly. Returns the text, with tabs, spaces, and newlines
114 # correctly evaluated. This method recursively descends through the
115 # children of the given element, accumulating text and "unwrapping"
116 # <text:s>, <text:tab>, and <text:line-break> elements along the way.
117 #
118 def extractText(odfElement):
119 result = [];
120
121 if len(odfElement.childNodes) != 0:
122 for child in odfElement.childNodes:
123 if child.nodeType == Node.TEXT_NODE:
124 result.append(child.data)
125 elif child.nodeType == Node.ELEMENT_NODE:
126 subElement = child
127 tagName = subElement.qname;
128 if tagName == (u"urn:oasis:names:tc:opendocument:xmlns:text:1.0", u"line-break"):
129 result.append("\n")
130 elif tagName == (u"urn:oasis:names:tc:opendocument:xmlns:text:1.0", u"tab"):
131 result.append("\t")
132 elif tagName == (u"urn:oasis:names:tc:opendocument:xmlns:text:1.0", u"s"):
133 c = subElement.getAttribute('c')
134 if c:
135 spaceCount = int(c)
136 else:
137 spaceCount = 1
138
139 result.append(" " * spaceCount)
140 else:
141 result.append(extractText(subElement))
142 return ''.join(result)
odf.teletype.WhitespaceText.spaceCount
spaceCount
Definition: teletype.py:39
odf.element
Definition: element.py:1
odf.teletype.WhitespaceText.addTextToElement
def addTextToElement
Process an input string, inserting elements for '', elements for ' '...
Definition: teletype.py:48
odf.text.S
def S
Definition: text.py:388
odf.text.Tab
def Tab
Definition: text.py:472
odf.teletype.addTextToElement
def addTextToElement
Definition: teletype.py:107
odf.teletype.WhitespaceText._emitTextBuffer
def _emitTextBuffer
Creates a Text Node whose contents are the current textBuffer.
Definition: teletype.py:91
odf.opendocument
Definition: opendocument.py:1
odf.teletype.WhitespaceText.textBuffer
textBuffer
Definition: teletype.py:38
odf.teletype.WhitespaceText
Definition: teletype.py:35
odf.teletype.extractText
def extractText
Extract text content from an Element, with whitespace represented properly.
Definition: teletype.py:118
object
odf.text
Definition: text.py:1
odf.teletype.WhitespaceText._emitSpaces
def _emitSpaces
Creates a element for the current spaceCount.
Definition: teletype.py:101
odf.text.LineBreak
def LineBreak
Definition: text.py:238
odf.teletype.WhitespaceText.__init__
def __init__
Definition: teletype.py:37