f0eb7e98ca
Before, equivalent types, eg. otTables.BacktrackCoverage, etc, where a subclass of their equivalent parent type, eg. otTables.Coverage With this change, they are the same type. The otBase and otConverters changes were needed to make the above happen and still generate correct XML for SubTable type.
490 lines
14 KiB
Python
490 lines
14 KiB
Python
from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.misc.textTools import safeEval
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from fontTools.misc.fixedTools import fixedToFloat as fi2fl, floatToFixed as fl2fi
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from .otBase import ValueRecordFactory
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def buildConverters(tableSpec, tableNamespace):
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"""Given a table spec from otData.py, build a converter object for each
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field of the table. This is called for each table in otData.py, and
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the results are assigned to the corresponding class in otTables.py."""
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converters = []
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convertersByName = {}
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for tp, name, repeat, aux, descr in tableSpec:
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tableName = name
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if name.startswith("ValueFormat"):
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assert tp == "uint16"
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converterClass = ValueFormat
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elif name.endswith("Count") or name.endswith("LookupType"):
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assert tp == "uint16"
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converterClass = ComputedUShort
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elif name == "SubTable":
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converterClass = SubTable
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elif name == "ExtSubTable":
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converterClass = ExtSubTable
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elif name == "FeatureParams":
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converterClass = FeatureParams
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else:
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if not tp in converterMapping:
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tableName = tp
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converterClass = Struct
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else:
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converterClass = converterMapping[tp]
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tableClass = tableNamespace.get(tableName)
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conv = converterClass(name, repeat, aux, tableClass)
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if name in ["SubTable", "ExtSubTable"]:
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conv.lookupTypes = tableNamespace['lookupTypes']
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# also create reverse mapping
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for t in conv.lookupTypes.values():
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for cls in t.values():
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convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
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if name == "FeatureParams":
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conv.featureParamTypes = tableNamespace['featureParamTypes']
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conv.defaultFeatureParams = tableNamespace['FeatureParams']
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for cls in conv.featureParamTypes.values():
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convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
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converters.append(conv)
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assert name not in convertersByName, name
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convertersByName[name] = conv
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return converters, convertersByName
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class _MissingItem(tuple):
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__slots__ = ()
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try:
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from collections import UserList
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except:
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from UserList import UserList
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class _LazyList(UserList):
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def __getslice__(self, i, j):
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return self.__getitem__(slice(i, j))
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def __getitem__(self, k):
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if isinstance(k, slice):
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indices = range(*k.indices(len(self)))
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return [self[i] for i in indices]
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item = self.data[k]
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if isinstance(item, _MissingItem):
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self.reader.seek(self.pos + item[0] * self.recordSize)
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item = self.conv.read(self.reader, self.font, {})
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self.data[k] = item
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return item
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class BaseConverter(object):
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"""Base class for converter objects. Apart from the constructor, this
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is an abstract class."""
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def __init__(self, name, repeat, aux, tableClass):
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self.name = name
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self.repeat = repeat
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self.aux = aux
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self.tableClass = tableClass
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self.isCount = name.endswith("Count")
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self.isLookupType = name.endswith("LookupType")
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self.isPropagated = name in ["ClassCount", "Class2Count", "FeatureTag", "SettingsCount", "AxisCount"]
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def readArray(self, reader, font, tableDict, count):
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"""Read an array of values from the reader."""
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lazy = font.lazy and count > 8
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if lazy:
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recordSize = self.getRecordSize(reader)
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if recordSize is NotImplemented:
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lazy = False
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if not lazy:
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l = []
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for i in range(count):
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l.append(self.read(reader, font, tableDict))
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return l
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else:
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l = _LazyList()
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l.reader = reader.copy()
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l.pos = l.reader.pos
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l.font = font
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l.conv = self
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l.recordSize = recordSize
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l.extend(_MissingItem([i]) for i in range(count))
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reader.advance(count * recordSize)
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return l
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def getRecordSize(self, reader):
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if hasattr(self, 'staticSize'): return self.staticSize
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return NotImplemented
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def read(self, reader, font, tableDict):
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"""Read a value from the reader."""
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raise NotImplementedError(self)
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def writeArray(self, writer, font, tableDict, values):
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for i, value in enumerate(values):
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self.write(writer, font, tableDict, value, i)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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"""Write a value to the writer."""
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raise NotImplementedError(self)
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def xmlRead(self, attrs, content, font):
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"""Read a value from XML."""
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raise NotImplementedError(self)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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"""Write a value to XML."""
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raise NotImplementedError(self)
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class SimpleValue(BaseConverter):
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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def xmlRead(self, attrs, content, font):
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return attrs["value"]
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class IntValue(SimpleValue):
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def xmlRead(self, attrs, content, font):
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return int(attrs["value"], 0)
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class Long(IntValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readLong()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeLong(value)
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class ULong(IntValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readULong()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeULong(value)
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class Short(IntValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readShort()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeShort(value)
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class UShort(IntValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readUShort()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(value)
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class UInt8(IntValue):
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staticSize = 1
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def read(self, reader, font, tableDict):
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return reader.readUInt8()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUInt8(value)
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class UInt24(IntValue):
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staticSize = 3
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def read(self, reader, font, tableDict):
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return reader.readUInt24()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUInt24(value)
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class ComputedUShort(UShort):
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.comment("%s=%s" % (name, value))
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xmlWriter.newline()
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class Tag(SimpleValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return reader.readTag()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeTag(value)
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class GlyphID(SimpleValue):
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staticSize = 2
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def readArray(self, reader, font, tableDict, count):
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glyphOrder = font.getGlyphOrder()
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gids = reader.readUShortArray(count)
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try:
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l = [glyphOrder[gid] for gid in gids]
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except IndexError:
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# Slower, but will not throw an IndexError on an invalid glyph id.
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l = [font.getGlyphName(gid) for gid in gids]
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return l
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def read(self, reader, font, tableDict):
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return font.getGlyphName(reader.readUShort())
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(font.getGlyphID(value))
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class FloatValue(SimpleValue):
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def xmlRead(self, attrs, content, font):
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return float(attrs["value"])
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class DeciPoints(FloatValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return reader.readUShort() / 10
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeUShort(int(round(value * 10)))
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class Fixed(FloatValue):
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staticSize = 4
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def read(self, reader, font, tableDict):
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return fi2fl(reader.readLong(), 16)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeLong(fl2fi(value, 16))
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class Version(BaseConverter):
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staticSize = 4
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def read(self, reader, font, tableDict):
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value = reader.readLong()
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assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
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return fi2fl(value, 16)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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if value < 0x10000:
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value = fl2fi(value, 16)
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value = int(round(value))
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assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
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writer.writeLong(value)
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def xmlRead(self, attrs, content, font):
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value = attrs["value"]
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value = float(int(value, 0)) if value.startswith("0") else float(value)
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if value >= 0x10000:
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value = fi2fl(value, 16)
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return value
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value >= 0x10000:
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value = fi2fl(value, 16)
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if value % 1 != 0:
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# Write as hex
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value = "0x%08x" % fl2fi(value, 16)
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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class Struct(BaseConverter):
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def getRecordSize(self, reader):
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return self.tableClass and self.tableClass.getRecordSize(reader)
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def read(self, reader, font, tableDict):
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table = self.tableClass()
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table.decompile(reader, font)
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return table
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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value.compile(writer, font)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value is None:
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if attrs:
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# If there are attributes (probably index), then
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# don't drop this even if it's NULL. It will mess
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# up the array indices of the containing element.
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xmlWriter.simpletag(name, attrs + [("empty", 1)])
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xmlWriter.newline()
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else:
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pass # NULL table, ignore
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else:
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value.toXML(xmlWriter, font, attrs, name=name)
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def xmlRead(self, attrs, content, font):
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if "empty" in attrs and safeEval(attrs["empty"]):
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return None
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table = self.tableClass()
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Format = attrs.get("Format")
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if Format is not None:
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table.Format = int(Format)
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for element in content:
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if isinstance(element, tuple):
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name, attrs, content = element
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table.fromXML(name, attrs, content, font)
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else:
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pass
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return table
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def __repr__(self):
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return "Struct of " + repr(self.tableClass)
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class Table(Struct):
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longOffset = False
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staticSize = 2
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def readOffset(self, reader):
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return reader.readUShort()
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def writeNullOffset(self, writer):
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if self.longOffset:
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writer.writeULong(0)
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else:
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writer.writeUShort(0)
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def read(self, reader, font, tableDict):
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offset = self.readOffset(reader)
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if offset == 0:
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return None
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if offset <= 3:
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# XXX hack to work around buggy pala.ttf
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print("*** Warning: offset is not 0, yet suspiciously low (%s). table: %s" \
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% (offset, self.tableClass.__name__))
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return None
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table = self.tableClass()
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reader = reader.getSubReader(offset)
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if font.lazy:
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table.reader = reader
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table.font = font
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else:
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table.decompile(reader, font)
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return table
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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if value is None:
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self.writeNullOffset(writer)
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else:
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subWriter = writer.getSubWriter()
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subWriter.longOffset = self.longOffset
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subWriter.name = self.name
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if repeatIndex is not None:
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subWriter.repeatIndex = repeatIndex
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writer.writeSubTable(subWriter)
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value.compile(subWriter, font)
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class LTable(Table):
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longOffset = True
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staticSize = 4
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def readOffset(self, reader):
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return reader.readULong()
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class SubTable(Table):
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def getConverter(self, tableType, lookupType):
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tableClass = self.lookupTypes[tableType][lookupType]
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return self.__class__(self.name, self.repeat, self.aux, tableClass)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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Table.xmlWrite(self, xmlWriter, font, value, None, attrs)
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class ExtSubTable(LTable, SubTable):
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.Extension = 1 # actually, mere presence of the field flags it as an Ext Subtable writer.
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Table.write(self, writer, font, tableDict, value, repeatIndex)
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class FeatureParams(Table):
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def getConverter(self, featureTag):
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tableClass = self.featureParamTypes.get(featureTag, self.defaultFeatureParams)
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return self.__class__(self.name, self.repeat, self.aux, tableClass)
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class ValueFormat(IntValue):
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staticSize = 2
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def __init__(self, name, repeat, aux, tableClass):
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BaseConverter.__init__(self, name, repeat, aux, tableClass)
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self.which = "ValueFormat" + ("2" if name[-1] == "2" else "1")
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def read(self, reader, font, tableDict):
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format = reader.readUShort()
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reader[self.which] = ValueRecordFactory(format)
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return format
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def write(self, writer, font, tableDict, format, repeatIndex=None):
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writer.writeUShort(format)
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writer[self.which] = ValueRecordFactory(format)
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class ValueRecord(ValueFormat):
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def getRecordSize(self, reader):
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return 2 * len(reader[self.which])
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def read(self, reader, font, tableDict):
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return reader[self.which].readValueRecord(reader, font)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer[self.which].writeValueRecord(writer, font, value)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value is None:
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pass # NULL table, ignore
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else:
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value.toXML(xmlWriter, font, self.name, attrs)
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def xmlRead(self, attrs, content, font):
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from .otBase import ValueRecord
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value = ValueRecord()
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value.fromXML(None, attrs, content, font)
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return value
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class DeltaValue(BaseConverter):
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def read(self, reader, font, tableDict):
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StartSize = tableDict["StartSize"]
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EndSize = tableDict["EndSize"]
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DeltaFormat = tableDict["DeltaFormat"]
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assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
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nItems = EndSize - StartSize + 1
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nBits = 1 << DeltaFormat
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minusOffset = 1 << nBits
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mask = (1 << nBits) - 1
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signMask = 1 << (nBits - 1)
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DeltaValue = []
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tmp, shift = 0, 0
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for i in range(nItems):
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if shift == 0:
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tmp, shift = reader.readUShort(), 16
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shift = shift - nBits
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value = (tmp >> shift) & mask
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if value & signMask:
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value = value - minusOffset
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DeltaValue.append(value)
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return DeltaValue
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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StartSize = tableDict["StartSize"]
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EndSize = tableDict["EndSize"]
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DeltaFormat = tableDict["DeltaFormat"]
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DeltaValue = value
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assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
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nItems = EndSize - StartSize + 1
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nBits = 1 << DeltaFormat
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assert len(DeltaValue) == nItems
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mask = (1 << nBits) - 1
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tmp, shift = 0, 16
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for value in DeltaValue:
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shift = shift - nBits
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tmp = tmp | ((value & mask) << shift)
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if shift == 0:
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writer.writeUShort(tmp)
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tmp, shift = 0, 16
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if shift != 16:
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writer.writeUShort(tmp)
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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def xmlRead(self, attrs, content, font):
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return safeEval(attrs["value"])
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converterMapping = {
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# type class
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"int16": Short,
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"uint8": UInt8,
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"uint16": UShort,
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"uint24": UInt24,
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"uint32": ULong,
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"Version": Version,
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"Tag": Tag,
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"GlyphID": GlyphID,
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"DeciPoints": DeciPoints,
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"Fixed": Fixed,
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"struct": Struct,
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"Offset": Table,
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"LOffset": LTable,
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"ValueRecord": ValueRecord,
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"DeltaValue": DeltaValue,
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}
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