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- from fontTools.misc.textTools import bytesjoin, tobytes, safeEval
- from . import DefaultTable
- import struct
- # https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html
- class table__l_t_a_g(DefaultTable.DefaultTable):
- def __init__(self, tag=None):
- DefaultTable.DefaultTable.__init__(self, tag)
- self.version, self.flags = 1, 0
- self.tags = []
- def addTag(self, tag):
- """Add 'tag' to the list of langauge tags if not already there.
- Returns the integer index of 'tag' in the list of all tags.
- """
- try:
- return self.tags.index(tag)
- except ValueError:
- self.tags.append(tag)
- return len(self.tags) - 1
- def decompile(self, data, ttFont):
- self.version, self.flags, numTags = struct.unpack(">LLL", data[:12])
- assert self.version == 1
- self.tags = []
- for i in range(numTags):
- pos = 12 + i * 4
- offset, length = struct.unpack(">HH", data[pos : pos + 4])
- tag = data[offset : offset + length].decode("ascii")
- self.tags.append(tag)
- def compile(self, ttFont):
- dataList = [struct.pack(">LLL", self.version, self.flags, len(self.tags))]
- stringPool = ""
- for tag in self.tags:
- offset = stringPool.find(tag)
- if offset < 0:
- offset = len(stringPool)
- stringPool = stringPool + tag
- offset = offset + 12 + len(self.tags) * 4
- dataList.append(struct.pack(">HH", offset, len(tag)))
- dataList.append(tobytes(stringPool))
- return bytesjoin(dataList)
- def toXML(self, writer, ttFont):
- writer.simpletag("version", value=self.version)
- writer.newline()
- writer.simpletag("flags", value=self.flags)
- writer.newline()
- for tag in self.tags:
- writer.simpletag("LanguageTag", tag=tag)
- writer.newline()
- def fromXML(self, name, attrs, content, ttFont):
- if not hasattr(self, "tags"):
- self.tags = []
- if name == "LanguageTag":
- self.tags.append(attrs["tag"])
- elif "value" in attrs:
- value = safeEval(attrs["value"])
- setattr(self, name, value)
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