155 lines
3.3 KiB
Python
155 lines
3.3 KiB
Python
"""fontTools.misc.textTools.py -- miscellaneous routines."""
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import ast
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import string
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# alias kept for backward compatibility
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safeEval = ast.literal_eval
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class Tag(str):
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@staticmethod
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def transcode(blob):
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if isinstance(blob, bytes):
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blob = blob.decode("latin-1")
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return blob
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def __new__(self, content):
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return str.__new__(self, self.transcode(content))
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def __ne__(self, other):
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return not self.__eq__(other)
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def __eq__(self, other):
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return str.__eq__(self, self.transcode(other))
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def __hash__(self):
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return str.__hash__(self)
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def tobytes(self):
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return self.encode("latin-1")
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def readHex(content):
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"""Convert a list of hex strings to binary data."""
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return deHexStr(strjoin(chunk for chunk in content if isinstance(chunk, str)))
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def deHexStr(hexdata):
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"""Convert a hex string to binary data."""
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hexdata = strjoin(hexdata.split())
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if len(hexdata) % 2:
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hexdata = hexdata + "0"
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data = []
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for i in range(0, len(hexdata), 2):
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data.append(bytechr(int(hexdata[i : i + 2], 16)))
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return bytesjoin(data)
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def hexStr(data):
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"""Convert binary data to a hex string."""
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h = string.hexdigits
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r = ""
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for c in data:
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i = byteord(c)
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r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
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return r
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def num2binary(l, bits=32):
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items = []
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binary = ""
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for i in range(bits):
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if l & 0x1:
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binary = "1" + binary
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else:
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binary = "0" + binary
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l = l >> 1
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if not ((i + 1) % 8):
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items.append(binary)
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binary = ""
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if binary:
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items.append(binary)
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items.reverse()
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assert l in (0, -1), "number doesn't fit in number of bits"
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return " ".join(items)
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def binary2num(bin):
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bin = strjoin(bin.split())
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l = 0
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for digit in bin:
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l = l << 1
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if digit != "0":
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l = l | 0x1
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return l
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def caselessSort(alist):
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"""Return a sorted copy of a list. If there are only strings
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in the list, it will not consider case.
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"""
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try:
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return sorted(alist, key=lambda a: (a.lower(), a))
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except TypeError:
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return sorted(alist)
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def pad(data, size):
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r"""Pad byte string 'data' with null bytes until its length is a
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multiple of 'size'.
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>>> len(pad(b'abcd', 4))
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4
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>>> len(pad(b'abcde', 2))
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6
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>>> len(pad(b'abcde', 4))
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8
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>>> pad(b'abcdef', 4) == b'abcdef\x00\x00'
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True
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"""
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data = tobytes(data)
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if size > 1:
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remainder = len(data) % size
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if remainder:
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data += b"\0" * (size - remainder)
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return data
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def tostr(s, encoding="ascii", errors="strict"):
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if not isinstance(s, str):
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return s.decode(encoding, errors)
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else:
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return s
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def tobytes(s, encoding="ascii", errors="strict"):
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if isinstance(s, str):
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return s.encode(encoding, errors)
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else:
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return bytes(s)
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def bytechr(n):
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return bytes([n])
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def byteord(c):
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return c if isinstance(c, int) else ord(c)
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def strjoin(iterable, joiner=""):
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return tostr(joiner).join(iterable)
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def bytesjoin(iterable, joiner=b""):
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return tobytes(joiner).join(tobytes(item) for item in iterable)
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if __name__ == "__main__":
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import doctest, sys
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sys.exit(doctest.testmod().failed)
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