summaryrefslogtreecommitdiff
path: root/src/xhtml.py
blob: 29017be37535da3dc47864b0df571d04401607a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
#!/usr/bin/env python3
#
# Copyright 2010-2011 Le Coz Florent <louiz@louiz.org>
#
# This file is part of Poezio.
#
# Poezio 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, version 3 of the License.
#
# Poezio 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 Poezio.  If not, see <http://www.gnu.org/licenses/>.

"""
Various methods to convert
shell colors to poezio colors,
xhtml code to shell colors,
poezio colors to xhtml code
"""

import re
import subprocess
from sleekxmpp.xmlstream import ET
from xml.etree.ElementTree import ElementTree
from sys import version_info
from string import digits

from config import config
import logging

log = logging.getLogger(__name__)

shell_colors_re = re.compile(r'(\[(?:\d+;)*(?:\d+m))')
start_indent_re = re.compile(r'\[0;30m\[0;37m   ')
newline_indent_re = re.compile('\n\[0;37m   ')

def get_body_from_message_stanza(message):
    """
    Returns a string with xhtml markups converted to
    poezio colors if there's an xhtml_im element, or
    the body (without any color) otherwise
    """
    if config.get('enable_xhtml_im', 'true') == 'true':
        xhtml_body = message['xhtml_im']
        if xhtml_body:
            xhtml_body = convert_links_to_plaintext(xhtml_body)
            try:
                shell_body = xhtml_code_to_shell_colors(xhtml_body)
            except OSError:
                log.error('html parsing failed')
            else:
                return shell_colors_to_poezio_colors(shell_body)
    return message['body']

def convert_links_to_plaintext(text):
    """
    Replace
    <a href='URL'>click</a>
    by
    <url> (click)
    in plain text
    """
    log.debug(text)
    xml = ElementTree(ET.fromstring(text))
    for parent in xml.getiterator():
        previous_child = None
        for child in parent:
            if child.tag == '{http://www.w3.org/1999/xhtml}a':
                link_text = '\n%s (%s)'%(child.attrib['href'], child.text)
                if previous_child is not None:
                    if previous_child.tail is None:
                        previous_child.tail = link_text
                    else:
                        previous_child.tail += link_text
                else:
                    if parent.text is None:
                        parent.text = link_text
                    else:
                        parent.text += link_text
                parent.remove(child)
            previous_child = child
    if version_info.minor <= 1:
        return ET.tostring(xml.getroot())
    return ET.tostring(xml.getroot(), encoding=str)


def clean_text(string):
    """
    Remove all \x19 from the string
    """
    pos = string.find('\x19')
    while pos != -1:
        string = string[:pos] + string[pos+2:]
        pos = string.find('\x19')
    return string

number_to_color_names = {
    1: 'red',
    2: 'green',
    3: 'yellow',
    4: 'blue',
    5: 'violet',
    6: 'turquoise',
    7: 'white'
}

def poezio_colors_to_html(string):
    """
    Convert poezio colors to html makups
    (e.g. \x191: <span style='color: red'>)
    """
    # TODO underlined

    # a list of all opened elements, e.g. ['strong', 'span']
    # So that we know what we need to close
    opened_elements = []
    res = "<body xmlns='http://www.w3.org/1999/xhtml'><p>"
    next_attr_char = string.find('\x19')
    while next_attr_char != -1:
        attr_char = string[next_attr_char+1].lower()
        if next_attr_char != 0:
            res += string[:next_attr_char]
        string = string[next_attr_char+2:]
        if attr_char == 'o':
            for elem in opened_elements[::-1]:
                res += '</%s>' % (elem,)
            opened_elements = []
        elif attr_char == 'b':
            if 'strong' not in opened_elements:
                opened_elements.append('strong')
                res += '<strong>'
        elif attr_char in digits:
            number = int(attr_char)
            if number in number_to_color_names:
                if 'strong' in opened_elements:
                    res += '</strong>'
                    opened_elements.remove('strong')
                if 'span' in opened_elements:
                    res += '</span>'
                else:
                    opened_elements.append('span')
                res += "<span style='color: %s'>" % (number_to_color_names[number])
        next_attr_char = string.find('\x19')
    res += string
    for elem in opened_elements[::-1]:
        res += '</%s>' % (elem,)
    res += "</p></body>"
    return res.replace('\n', '<br />')

def shell_colors_to_poezio_colors(string):
    """
    'shell colors' means something like:

    Bonjour ^[[0;32msalut^[[0m

    The current understanding of this syntax is:
    n = 0: reset all attributes to defaults
    n = 1: activate bold
    n >= 30 and n <= 37: set the foreground to n-30

    """
    def repl(matchobj):
        exp = matchobj.group(0)[2:-1]
        numbers = [int(nb) for nb in exp.split(';')]
        res = ''
        for num in numbers:
            if num == 0:
                res += '\x19o'
            elif num == 1:
                res += '\x19b'
            elif num >= 31 and num <= 37:
                res += '\x19%d' % ((num-30)%7,)
        return res
    def remove_elinks_indent(string):
        lines = string.split('\n')
        for i, line in enumerate(lines):
            lines[i] = re.sub('   ', '', line, 1)
        return '\n'.join(lines)
    res = shell_colors_re.sub(repl, string).strip()
    res = remove_elinks_indent(res)
    return res

def xhtml_code_to_shell_colors(string):
    """
    Use a console browser to parse the xhtml and
    make it return a shell-colored string
    """
    process = subprocess.Popen(["elinks", "-dump", "-dump-color-mode", "2"], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
    result = process.communicate(input=string.encode('utf-8'))[0]
    return result.decode('utf-8').strip()

def poezio_colors_to_xhtml(string):
    """
    Generate a valid xhtml string from
    the poezio colors in the given string
    """
    res = "<body xmlns='http://www.w3.org/1999/xhtml'>"
    next_attr_char = string.find('\x19')
    open_elements = []
    while next_attr_char != -1:
        attr_char = string[next_attr_char+1].lower()
        if next_attr_char != 0:
            res += string[:next_attr_char]
        string = string[next_attr_char+2:]
        if attr_char == 'o':
            # close all opened elements
            for elem in open_elements:
                res += '</%s>'
            open_elements = []
        elif attr_char == 'b':
            if 'strong' not in open_elements:
                res += '<strong>'
                open_elements.append('strong')
        elif attr_char in digits:
            self._win.attron(common.curses_color_pair(int(attr_char)))
        next_attr_char = string.find('\x19')