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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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