counter.py

from browser import document

cp437table = (
             '\x00\u263a\u263b\u2665\u2666\u2663\u2660\u2022\u25d8\u25cb\u25d9'
             '\u2642\u2640\u266a\u266b\u263c\u25ba\u25c4\u2195\u203c\xb6\xa7'
             '\u25ac\u21a8\u2191\u2193\u2192\u2190\u221f\u2194\u25b2\u25bc'
             ' !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]'
             '^_`abcdefghijklmnopqrstuvwxyz{|}~\u2302\xc7\xfc\xe9\xe2\xe4\xe0'
             '\xe5\xe7\xea\xeb\xe8\xef\xee\xec\xc4\xc5\xc9\xe6\xc6\xf4\xf6\xf2'
             '\xfb\xf9\xff\xd6\xdc\xa2\xa3\xa5\u20a7\u0192\xe1\xed\xf3\xfa\xf1'
             '\xd1\xaa\xba\xbf\u2310\xac\xbd\xbc\xa1\xab\xbb\u2591\u2592\u2593'
             '\u2502\u2524\u2561\u2562\u2556\u2555\u2563\u2551\u2557\u255d'
             '\u255c\u255b\u2510\u2514\u2534\u252c\u251c\u2500\u253c\u255e'
             '\u255f\u255a\u2554\u2569\u2566\u2560\u2550\u256c\u2567\u2568'
             '\u2564\u2565\u2559\u2558\u2552\u2553\u256b\u256a\u2518\u250c'
             '\u2588\u2584\u258c\u2590\u2580\u03b1\xdf\u0393\u03c0\u03a3\u03c3'
             '\xb5\u03c4\u03a6\u0398\u03a9\u03b4\u221e\u03c6\u03b5\u2229\u2261'
             '\xb1\u2265\u2264\u2320\u2321\xf7\u2248\xb0\u2219\xb7\u221a\u207f'
             '\xb2\u25a0\xa0'
             )
asciitable = ''.join(map(chr, range(128)))
jellytable = (
    '\xa1\xa2\xa3\xa4\xa5\xa6\xa9\xac\xae\xb5\xbd\xbf\u20ac\xc6\xc7'
    '\xd0\xd1\xd7\xd8\u0152\xde\xdf\xe6\xe7\xf0\u0131\u0237\xf1\xf7\xf8\u0153'
    '\xfe !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`ab'
    'cdefghijklmnopqrstuvwxyz{|}~\xb6\xb0\xb9\xb2\xb3\u2074\u2075\u2076\u2077'
    '\u2078\u2079\u207a\u207b\u207c\u207d\u207e\u0181\u0187\u018a\u0191\u0193'
    '\u0198\u2c6e\u019d\u01a4\u01ac\u01b2\u0224\u0253\u0188\u0257\u0192\u0260'
    '\u0266\u0199\u0271\u0272\u01a5\u02a0\u027c\u0282\u01ad\u028b\u0225\u1ea0'
    '\u1e04\u1e0c\u1eb8\u1e24\u1eca\u1e32\u1e36\u1e42\u1e46\u1ecc\u1e5a\u1e62'
    '\u1e6c\u1ee4\u1e7e\u1e88\u1ef4\u1e92\u0226\u1e02\u010a\u1e0a\u0116\u1e1e'
    '\u0120\u1e22\u0130\u013f\u1e40\u1e44\u022e\u1e56\u1e58\u1e60\u1e6a\u1e86'
    '\u1e8a\u1e8e\u017b\u1ea1\u1e05\u1e0d\u1eb9\u1e25\u1ecb\u1e33\u1e37\u1e43'
    '\u1e47\u1ecd\u1e5b\u1e63\u1e6d\u1ee5\u1e7f\u1e89\u1ef5\u1e93\u0227\u1e03'
    '\u010b\u1e0b\u0117\u1e1f\u0121\u1e23\u0140\u1e41\u1e45\u022f\u1e57\u1e59'
    '\u1e61\u1e6b\u1e87\u1e8b\u1e8f\u017c\xab\xbb\u2018\u2019\u201c\u201d'
    )

supported_pages = [
 'ascii', 'cp037', 'cp1006', 'cp1026', 'cp1140', 'cp1250',
 'cp1251', 'cp1252', 'cp1253', 'cp1254', 'cp1255', 'cp1256', 'cp1257',
 'cp1258', 'cp424', 'cp437', 'cp500', 'cp720', 'cp737', 'cp775', 'cp850',
 'cp852', 'cp855', 'cp856', 'cp857', 'cp858', 'cp860', 'cp861', 'cp862',
 'cp863', 'cp864', 'cp865', 'cp866', 'cp869', 'cp874', 'cp875', 'iso8859_1',
 'iso8859_10', 'iso8859_13', 'iso8859_14', 'iso8859_15', 'iso8859_16',
 'iso8859_2', 'iso8859_3', 'iso8859_4', 'iso8859_5', 'iso8859_6', 'iso8859_7',
 'iso8859_8', 'iso8859_9', 'jelly', 'koi8_r', 'koi8_u', 'mac_cyrillic',
 'mac_greek', 'mac_iceland', 'mac_latin2', 'mac_roman', 'mac_turkish',
 'ptcp154'
]

codepages = {
    "cp437": cp437table,
    "ascii": asciitable,
    "jelly": jellytable
}

def encode(txt, page):
  return bytes([codepages[page].index(c) for c in txt])

for page in supported_pages:
    if page not in codepages:
        codepages[page] = ''
        for i in range(256):
            try:
                codepages[page] += bytes([i]).decode(page)
            except:
                codepages[page] += b'\x00'.decode(page)
        
def count_bytes(txt):
    byte_counts = {"UTF-8":("UTF-8",len(txt.encode('utf-8')),txt.encode('utf-8'))}
    for page in codepages:
        try:
            byte_counts[page] = (page, len(txt), txt.encode(page) if page not in ("cp437","ascii","jelly") else encode(txt, page))
        except:
            pass
    return byte_counts
    
def on_submit(ev):
    txt = document['text'].value
    counts = count_bytes(txt)
    document['counts'].html = ''
    for page, length, raw in counts.values():
        document['counts'].html += '<b>{0}:</b> {1} bytes ({2})<br>'.format(page.upper(), length, ' '.join("{0:02X}".format(c) for c in raw))
        
document['submit'].bind('click', on_submit)