comparison mercurial/encoding.py @ 28069:b2d24c2898f9

encoding: backport paranoid escaping from templatefilters.jsonescape()

This was introduced by 55c763926a28. It is required to embed JSON data in
HTML page. Convince yourself here:

http://escape.alf.nu/1

28068:9ece901f7a19

_jsonmap[0x5c] = '\\\\'
_jsonmap[0x08] = '\\b'
_jsonmap[0x0c] = '\\f'
_jsonmap[0x0d] = '\\r'
_paranoidjsonmap = _jsonmap[:]
_jsonmap.extend(chr(x) for x in xrange(128, 256))

def jsonescape(s, paranoid=False):
    '''returns a string suitable for JSON

    >>> jsonescape('utf-8: caf\\xc3\\xa9')
    'utf-8: caf\\xc3\\xa9'
    >>> jsonescape('')
    ''

    If paranoid, non-ascii characters are also escaped. This is suitable for
    web output.

    >>> jsonescape('escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True)
    'escape boundary: ~ \\\\u007f \\\\u0080'
    >>> jsonescape('a weird byte: \\xdd', paranoid=True)
    'a weird byte: \\\\udcdd'
    >>> jsonescape('utf-8: caf\\xc3\\xa9', paranoid=True)
    'utf-8: caf\\\\u00e9'
    >>> jsonescape('non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True)
    'non-BMP: \\\\ud834\\\\udd1e'
    '''

    if paranoid:
        jm = _paranoidjsonmap
    else:

28069:b2d24c2898f9

_jsonmap[0x5c] = '\\\\'
_jsonmap[0x08] = '\\b'
_jsonmap[0x0c] = '\\f'
_jsonmap[0x0d] = '\\r'
_paranoidjsonmap = _jsonmap[:]
_paranoidjsonmap[0x3c] = '\\u003c'  # '<' (e.g. escape "</script>")
_paranoidjsonmap[0x3e] = '\\u003e'  # '>'
_jsonmap.extend(chr(x) for x in xrange(128, 256))

def jsonescape(s, paranoid=False):
    '''returns a string suitable for JSON

    >>> jsonescape('utf-8: caf\\xc3\\xa9')
    'utf-8: caf\\xc3\\xa9'
    >>> jsonescape('')
    ''

    If paranoid, non-ascii and common troublesome characters are also escaped.
    This is suitable for web output.

    >>> jsonescape('escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True)
    'escape boundary: ~ \\\\u007f \\\\u0080'
    >>> jsonescape('a weird byte: \\xdd', paranoid=True)
    'a weird byte: \\\\udcdd'
    >>> jsonescape('utf-8: caf\\xc3\\xa9', paranoid=True)
    'utf-8: caf\\\\u00e9'
    >>> jsonescape('non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True)
    'non-BMP: \\\\ud834\\\\udd1e'
    >>> jsonescape('<[e-mail]>', paranoid=True)
    '\\\\[e-mail]\\\\u003e'
    '''

    if paranoid:
        jm = _paranoidjsonmap
    else: