Source code for fontTools.misc.textTools

"""fontTools.misc.textTools.py -- miscellaneous routines."""


from fontTools.misc.py23 import *
import ast
import string


# alias kept for backward compatibility
safeEval = ast.literal_eval


[docs]def readHex(content): """Convert a list of hex strings to binary data.""" return deHexStr(strjoin(chunk for chunk in content if isinstance(chunk, basestring)))
[docs]def deHexStr(hexdata): """Convert a hex string to binary data.""" hexdata = strjoin(hexdata.split()) if len(hexdata) % 2: hexdata = hexdata + "0" data = [] for i in range(0, len(hexdata), 2): data.append(bytechr(int(hexdata[i:i+2], 16))) return bytesjoin(data)
[docs]def hexStr(data): """Convert binary data to a hex string.""" h = string.hexdigits r = '' for c in data: i = byteord(c) r = r + h[(i >> 4) & 0xF] + h[i & 0xF] return r
[docs]def num2binary(l, bits=32): items = [] binary = "" for i in range(bits): if l & 0x1: binary = "1" + binary else: binary = "0" + binary l = l >> 1 if not ((i+1) % 8): items.append(binary) binary = "" if binary: items.append(binary) items.reverse() assert l in (0, -1), "number doesn't fit in number of bits" return ' '.join(items)
[docs]def binary2num(bin): bin = strjoin(bin.split()) l = 0 for digit in bin: l = l << 1 if digit != "0": l = l | 0x1 return l
[docs]def caselessSort(alist): """Return a sorted copy of a list. If there are only strings in the list, it will not consider case. """ try: return sorted(alist, key=lambda a: (a.lower(), a)) except TypeError: return sorted(alist)
[docs]def pad(data, size): r""" Pad byte string 'data' with null bytes until its length is a multiple of 'size'. >>> len(pad(b'abcd', 4)) 4 >>> len(pad(b'abcde', 2)) 6 >>> len(pad(b'abcde', 4)) 8 >>> pad(b'abcdef', 4) == b'abcdef\x00\x00' True """ data = tobytes(data) if size > 1: remainder = len(data) % size if remainder: data += b"\0" * (size - remainder) return data
if __name__ == "__main__": import doctest, sys sys.exit(doctest.testmod().failed)