rebase.coffee

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rebase.coffee

EXPORTER = (exports ? this)

BASE52 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
BASE57 = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"

Our base57 digit set is A-Za-z0-9 less the five ambiguous ones: zero, one, capital I, capital O and lower case ell: 01OIl so 52+10-5 = 57

BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
BASE10 = "0123456789"
BASE2 = "01"
BASE8 = "01234567"
BASE10 = "0123456789"
BASE16 = "0123456789abcdef"
BASE75 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_.,!=-*(){}[]"

  convert.js
  http://rot47.net
  Dr Zhihua Lai

convert = (src, srctable, desttable) ->
  srclen = srctable.length
  destlen = desttable.length

first convert to base 10

  val = 0
  numlen = src.length
  i = 0

  while i < numlen
    val = val * srclen + srctable.indexOf(src.charAt(i))
    i++
  return 0  if val < 0

then covert to any base

  r = val % destlen
  res = desttable.charAt(r)
  q = Math.floor(val / destlen)
  while q
    r = q % destlen
    q = Math.floor(q / destlen)
    res = desttable.charAt(r) + res
  res

EXPORTER.DEFAULT_BASE = BASE57
base_to_int = (base) ->
  parseInt(convert(base, EXPORTER.DEFAULT_BASE, BASE10))
EXPORTER.base_to_int = base_to_int

int_to_base = (intgr) ->
  convert(""+intgr, BASE10, EXPORTER.DEFAULT_BASE)
EXPORTER.int_to_base = int_to_base

modulo_char_at = (base, byte) ->
  return base[byte % base.length]

symbol_from_bytes = (bytes, base) ->

¶

Purpose Return a symbol (ie does not start with a digit) from an array Accept bytes: an array of bytes base: an array of characters used as a base (optional or DEFAULT_BASE used)
```
  if not base?
    base = EXPORTER.DEFAULT_BASE
    if not EXPORTER.DEFAULT_BASE_nondig
```

cache nondig for reuse

      EXPORTER.DEFAULT_BASE_nondig = base.replace(/\d/g,'')
    nondig = EXPORTER.DEFAULT_BASE_nondig
  else
    nondig = base.replace(/\d/g,'')
  out = [modulo_char_at(nondig,bytes[0])]
  for b in bytes[1...bytes.length] by 1
    out.push(modulo_char_at(base, b))
  return out.join('')

logBASE = Math.log(EXPORTER.DEFAULT_BASE.length)

¶

We count the number of digits in the base. WARNING this assumes that the digits are all at the beginning of the BASE
```
numDigitsBASE = EXPORTER.DEFAULT_BASE.match(/^\d*/g)[0].length

int_to_base_symbol = (intgr) ->
```
¶

FIXME(smurp) bugged!!!! because several inputs will produce the same output Return a value which does not start with a digit

If the intgr is going to cause an response which starts with a digit \d then increase intgr to the first value which will not do so.

This line is a presumably slow workaround if (“”+(Math.log(intgr)/logBASE)).indexOf(“.”) is -1 for this line, which is legal only in more recent coffeescript if ((Math.log(intgr)/logBASE) %% 1) is 0 so we will gear down to javascript native code
```
  `if (((Math.log(intgr)/logBASE) % 1) === 0) {
    intgr = intgr * numDigitsBASE;
   }`
  return [int_to_base(intgr), intgr]
EXPORTER.make_symbol = int_to_base_symbol
EXPORTER.int_to_base = int_to_base
EXPORTER.symbol_from_bytes = symbol_from_bytes
EXPORTER.rebase = convert
```