path: root/src/xhtml.py

# Copyright 2010-2011 Florent Le Coz <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 zlib license. See the COPYING file.

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

import re
import curses
from sleekxmpp.xmlstream import ET

import xml.sax.saxutils

from sys import version_info

from config import config
import logging

digits = '0123456789' # never trust the modules

# HTML named colors
colors = {
    'aliceblue': 231,
    'antiquewhite': 231,
    'aqua': 51,
    'aquamarine': 122,
    'azure': 231,
    'beige': 231,
    'bisque': 230,
    'black': 232,
    'blanchedalmond': 230,
    'blue': 21,
    'blueviolet': 135,
    'brown': 124,
    'burlywood': 223,
    'cadetblue': 109,
    'chartreuse': 118,
    'chocolate': 172,
    'coral': 209,
    'cornflowerblue': 111,
    'cornsilk': 231,
    'crimson': 197,
    'cyan': 51,
    'darkblue': 19,
    'darkcyan': 37,
    'darkgoldenrod': 178,
    'darkgray': 247,
    'darkgreen': 28,
    'darkgrey': 247,
    'darkkhaki': 186,
    'darkmagenta': 127,
    'darkolivegreen': 65,
    'darkorange': 214,
    'darkorchid': 134,
    'darkred': 124,
    'darksalmon': 216,
    'darkseagreen': 151,
    'darkslateblue': 61,
    'darkslategray': 59,
    'darkslategrey': 59,
    'darkturquoise': 44,
    'darkviolet': 128,
    'deeppink': 199,
    'deepskyblue': 45,
    'dimgray': 241,
    'dimgrey': 241,
    'dodgerblue': 39,
    'firebrick': 160,
    'floralwhite': 231,
    'forestgreen': 34,
    'fuchsia': 201,
    'gainsboro': 252,
    'ghostwhite': 231,
    'gold': 226,
    'goldenrod': 214,
    'gray': 244,
    'green': 34,
    'greenyellow': 191,
    'grey': 244,
    'honeydew': 231,
    'hotpink': 212,
    'indianred': 174,
    'indigo': 55,
    'ivory': 231,
    'khaki': 229,
    'lavender': 231,
    'lavenderblush': 231,
    'lawngreen': 118,
    'lemonchiffon': 230,
    'lightblue': 195,
    'lightcoral': 217,
    'lightcyan': 231,
    'lightgoldenrodyellow': 230,
    'lightgray': 251,
    'lightgreen': 157,
    'lightgrey': 251,
    'lightpink': 224,
    'lightsalmon': 216,
    'lightseagreen': 43,
    'lightskyblue': 153,
    'lightslategray': 109,
    'lightslategrey': 109,
    'lightsteelblue': 189,
    'lightyellow': 231,
    'lime': 46,
    'limegreen': 77,
    'linen': 231,
    'magenta': 201,
    'maroon': 124,
    'mediumaquamarine': 115,
    'mediumblue': 20,
    'mediumorchid': 170,
    'mediumpurple': 141,
    'mediumseagreen': 78,
    'mediumslateblue': 105,
    'mediumspringgreen': 49,
    'mediumturquoise': 80,
    'mediumvioletred': 163,
    'midnightblue': 18,
    'mintcream': 231,
    'mistyrose': 231,
    'moccasin': 230,
    'navajowhite': 230,
    'navy': 19,
    'oldlace': 231,
    'olive': 142,
    'olivedrab': 106,
    'orange': 214,
    'orangered': 202,
    'orchid': 213,
    'palegoldenrod': 229,
    'palegreen': 157,
    'paleturquoise': 195,
    'palevioletred': 211,
    'papayawhip': 231,
    'peachpuff': 230,
    'peru': 179,
    'pink': 224,
    'plum': 219,
    'powderblue': 195,
    'purple': 127,
    'red': 196,
    'rosybrown': 181,
    'royalblue': 69,
    'saddlebrown': 130,
    'salmon': 216,
    'sandybrown': 216,
    'seagreen': 72,
    'seashell': 231,
    'sienna': 131,
    'silver': 250,
    'skyblue': 153,
    'slateblue': 104,
    'slategray': 109,
    'slategrey': 109,
    'snow': 231,
    'springgreen': 48,
    'steelblue': 74,
    'tan': 187,
    'teal': 37,
    'thistle': 225,
    'tomato': 209,
    'turquoise': 86,
    'violet': 219,
    'wheat': 230,
    'white': 255,
    'whitesmoke': 255,
    'yellow': 226,
    'yellowgreen': 149
}

log = logging.getLogger(__name__)

whitespace_re = re.compile(r'\s+')

xhtml_attr_re = re.compile(r'\x19\d{0,3}\}|\x19[buaio]')

xhtml_simple_attr_re = re.compile(r'\x19\d')

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 = message['html'].xml
        xhtml_body = xhtml.find('{http://www.w3.org/1999/xhtml}body')
        if xhtml_body:
            content = xhtml_to_poezio_colors(xhtml_body)
            content = content if content else message['body']
            return content or " "
    return message['body']

def ncurses_color_to_html(color):
    """
    Takes an int between 0 and 256 and returns
    a string of the form #XXXXXX representing an
    html color.
    """
    if color <= 15:
        try:
            (r, g, b) = curses.color_content(color)
        except: # fallback in faulty terminals (e.g. xterm)
            (r, g, b) = curses.color_content(color%8)
        r = r / 1000 * 6 - 0.01
        g = g / 1000 * 6 - 0.01
        b = b / 1000 * 6 - 0.01
    elif color <= 231:
        color = color - 16
        r = color % 6
        color = color / 6
        g = color % 6
        color = color / 6
        b = color % 6
    else:
        color -= 232
        r = g = b = color / 24 * 6
    return '#%02X%02X%02X' % (r*256/6, g*256/6, b*256/6)

def xhtml_to_poezio_colors(xml):
    if isinstance(xml, str):
        try:
            xml = ET.fromstring(xml)
        except cElementTree.ParserError as e:
            log.error("Error decoding XML: [%s] (%s)" % (xml, e))
            return ""
    def parse_css(css):
        def get_color(value):
            if value[0] == '#':
                value = value[1:]
                length = len(value)
                if length != 3 and length != 6:
                    return -1
                value = int(value, 16)
                if length == 6:
                    r = int(value >> 16)
                    g = int((value >> 8) & 0xff)
                    b = int(value & 0xff)
                    if r == g == b:
                        return 232 + int(r/10.6251)
                    div = 42.51
                else:
                    r = int(value >> 8)
                    g = int((value >> 4) & 0xf)
                    b = int(value & 0xf)
                    if r == g == b:
                        return 232 + int(1.54*r)
                    div = 2.51
                return 6*6*int(r/div) + 6*int(g/div) + int(b/div) + 16
            if value in colors:
                return colors[value]
            return -1
        shell = ''
        rules = css.split(';')
        for rule in rules:
            if ':' not in rule:
                continue
            key, value = rule.split(':', 1)
            key = key.strip()
            value = value.strip()
            if key == 'background-color':
                pass#shell += '\x191'
            elif key == 'color':
                color = get_color(value)
                if color != -1:
                    shell += '\x19%d}' % color
            elif key == 'font-style':
                shell += '\x19i'
            elif key == 'font-weight':
                shell += '\x19b'
            elif key == 'margin-left':
                shell += '    '
            elif key == 'text-align':
                pass
            elif key == 'text-decoration':
                if value == 'underline':
                    shell += '\x19u'
                elif value == 'blink':
                    shell += '\x19a'
        return shell

    def trim(string):
        return re.sub(whitespace_re, ' ', string)

    builder = []

    if version_info[1] < 2: #deprecated
        elems = xml.getiterator()
    else:
        elems = xml.iter()

    for elem in elems:
        if elem.tag == '{http://www.w3.org/1999/xhtml}a':
            if 'href' in elem.attrib and elem.attrib['href'] != elem.text:
                builder.append('\x19u%s\x19o (%s)' % (trim(elem.attrib['href']), trim(elem.text if elem.text else "")))
            else:
                builder.append('\x19u' + (elem.text if elem.text else "") + '\x19o')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}blockquote':
            builder.append('“')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}body':
            pass
        elif elem.tag == '{http://www.w3.org/1999/xhtml}br':
            builder.append('\n')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}cite':
            builder.append('\x19u')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}em':
            builder.append('\x19i')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}img' and 'src' in elem.attrib:
            if 'alt' in elem.attrib:
                builder.append('%s (%s)' % (trim(elem.attrib['src']), trim(elem.attrib['alt'])))
            else:
                builder.append(elem.attrib['src'])
        elif elem.tag == '{http://www.w3.org/1999/xhtml}li':
            pass
        elif elem.tag == '{http://www.w3.org/1999/xhtml}ol':
            pass
        elif elem.tag == '{http://www.w3.org/1999/xhtml}p':
            pass
        elif elem.tag == '{http://www.w3.org/1999/xhtml}span':
            pass
        elif elem.tag == '{http://www.w3.org/1999/xhtml}strong':
            builder.append('\x19b')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}ul':
            pass

        if ('style' in elem.attrib and elem.tag != '{http://www.w3.org/1999/xhtml}br'
                                   and elem.tag != '{http://www.w3.org/1999/xhtml}em'
                                   and elem.tag != '{http://www.w3.org/1999/xhtml}strong'):
            builder.append(parse_css(elem.attrib['style']))

        if (elem.text and elem.tag != '{http://www.w3.org/1999/xhtml}a'
                      and elem.tag != '{http://www.w3.org/1999/xhtml}br'
                      and elem.tag != '{http://www.w3.org/1999/xhtml}img'):
            builder.append(trim(elem.text))

        if ('style' in elem.attrib and elem.tag != '{http://www.w3.org/1999/xhtml}br'
                                   and elem.tag != '{http://www.w3.org/1999/xhtml}em'
                                   and elem.tag != '{http://www.w3.org/1999/xhtml}strong'):
            builder.append('\x19o')

        if elem.tag == '{http://www.w3.org/1999/xhtml}blockquote':
            builder.append('”')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}cite':
            builder.append('\x19o')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}em':
            builder.append('\x19o')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}strong' or elem.tag == '{http://www.w3.org/1999/xhtml}b':
            builder.append('\x19o')
        elif elem.tag == '{http://www.w3.org/1999/xhtml}u':
            builder.append('\x19o')

        if 'title' in elem.attrib:
            builder.append(' [' + elem.attrib['title'] + ']')

        if elem.tail:
            builder.append(trim(elem.tail))
    return ''.join(builder)

def clean_text(s):
    """
    Remove all xhtml-im attributes (\x19etc) from the string with the
    complete color format, i.e \x19xxx}
    """
    s = re.sub(xhtml_attr_re, "", s)
    return s

def clean_text_simple(string):
    """
    Remove all \x19 from the string formatted with simple colors:
    \x198
    """
    pos = string.find('\x19')
    while pos != -1:
        string = string[:pos] + string[pos+2:]
        pos = string.find('\x19')
    return string

def convert_simple_to_full_colors(text):
    """
    takes a \x19n formatted string and returns
    a \x19n} formatted one.
    """
    def add_curly_bracket(match):
        return match.group(0) + '}'
    return re.sub(xhtml_simple_attr_re, add_curly_bracket, text)

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

def format_inline_css(_dict):
    return ''.join(('%s: %s;' % (key, value) for key, value in _dict.items()))

def poezio_colors_to_html(string):
    """
    Convert poezio colors to html
    (e.g. \x191}: <span style='color: red'>)
    """
    # Maintain a list of the current css attributes used
    # And check if a tag is open (by design, we only open
    # spans tag, and they cannot be nested.
    current_attrs = {}
    tag_open = False
    next_attr_char = string.find('\x19')
    build = ["<body xmlns='http://www.w3.org/1999/xhtml'><p>"]

    def check_property(key, value):
        nonlocal tag_open
        if current_attrs.get(key, None) == value:
            return
        current_attrs[key] = value
        if tag_open:
            tag_open = False
            build.append('</span>')

    while next_attr_char != -1:
        attr_char = string[next_attr_char+1].lower()

        if next_attr_char != 0 and string[:next_attr_char]:
            if current_attrs and not tag_open:
                build.append('<span style="%s">' % format_inline_css(current_attrs))
                tag_open = True
            build.append(xml.sax.saxutils.escape(string[:next_attr_char]))

        if attr_char == 'o':
            if tag_open:
                build.append('</span>')
                tag_open = False
            current_attrs = {}
        elif attr_char == 'b':
            check_property('font-weight', 'bold')
        elif attr_char == 'u':
            check_property('text-decoration', 'underline')

        if attr_char in digits:
            number_str = string[next_attr_char+1:string.find('}', next_attr_char)]
            number = int(number_str)
            if number in number_to_color_names:
                check_property('color', number_to_color_names.get(number, 'black'))
            else:
                check_property('color', ncurses_color_to_html(number))
            string = string[next_attr_char+len(number_str)+2:]
        else:
            string = string[next_attr_char+2:]
        next_attr_char = string.find('\x19')

    if current_attrs and not tag_open and string:
        build.append('<span style="%s">' % format_inline_css(current_attrs))
        tag_open = True
    build.append(xml.sax.saxutils.escape(string))
    if tag_open:
        build.append('</span>')
    build.append("</p></body>")
    text = ''.join(build)
    return text.replace('\n', '<br />')