495c6831e1
A while back I changed code such that Lookup.LookupType is written as a comment in XML, and ignored when compiling. The LookupType from type of actual subtables in a lookup were used during compilation instead. This caused the problem where an empty lookup (one with no subtables) would lose its lookup types, among other subtle problems. With this change we revert above behavior, but keep the benefits: if Lookup.LookupType is different from actual lookup type of the subtables, compilation raises an exception. Setting LookupType on Lookup object or in XML is optional now, but written out by default in XML (instead of as a comment). This changes XML output for all GSUB/GPOS tables. I'm sorry for the noise. Please update your sources. Fixes https://github.com/fonttools/fonttools/issues/789
623 lines
18 KiB
Python
623 lines
18 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 (
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fixedToFloat as fi2fl, floatToFixed as fl2fi, ensureVersionIsLong as fi2ve,
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versionToFixed as ve2fi)
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from .otBase import ValueRecordFactory
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from functools import partial
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import logging
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log = logging.getLogger(__name__)
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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"):
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assert tp in ("uint16", "uint32")
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converterClass = ComputedUShort if tp == 'uint16' else ComputedULong
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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 and '(' not in tp:
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tableName = tp
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converterClass = Struct
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else:
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converterClass = eval(tp, tableNamespace, converterMapping)
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tableClass = tableNamespace.get(tableName)
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if tableClass is not None:
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conv = converterClass(name, repeat, aux, tableClass=tableClass)
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else:
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conv = converterClass(name, repeat, aux)
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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=None):
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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") or name in ['DesignAxisRecordSize', 'ValueRecordSize']
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self.isLookupType = name.endswith("LookupType")
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self.isPropagated = name in ["ClassCount", "Class2Count", "FeatureTag", "SettingsCount", "VarRegionCount", "MappingCount", "RegionAxisCount", 'DesignAxisCount', 'DesignAxisRecordSize', 'AxisValueCount', 'ValueRecordSize']
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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 Int8(IntValue):
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staticSize = 1
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def read(self, reader, font, tableDict):
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return reader.readInt8()
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeInt8(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 ComputedInt(IntValue):
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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if value is not None:
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xmlWriter.comment("%s=%s" % (name, value))
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xmlWriter.newline()
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class ComputedUShort(ComputedInt, UShort):
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pass
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class ComputedULong(ComputedInt, ULong):
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pass
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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 NameID(UShort):
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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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nameTable = font.get("name") if font else None
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if nameTable:
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name = nameTable.getDebugName(value)
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xmlWriter.write(" ")
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if name:
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xmlWriter.comment(name)
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else:
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xmlWriter.comment("missing from name table")
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log.warning("name id %d missing from name table" % value)
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xmlWriter.newline()
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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 F2Dot14(FloatValue):
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staticSize = 2
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def read(self, reader, font, tableDict):
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return fi2fl(reader.readShort(), 14)
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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writer.writeShort(fl2fi(value, 14))
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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 value
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def write(self, writer, font, tableDict, value, repeatIndex=None):
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value = fi2ve(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 = ve2fi(value)
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return value
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def xmlWrite(self, xmlWriter, font, value, name, attrs):
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value = fi2ve(value)
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value = "0x%08x" % value
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xmlWriter.simpletag(name, attrs + [("value", value)])
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xmlWriter.newline()
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@staticmethod
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def fromFloat(v):
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return fl2fi(v, 16)
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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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# TODO Fill in items that are not set by XML.
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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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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 = True # 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=None):
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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):
|
|
xmlWriter.simpletag(name, attrs + [("value", value)])
|
|
xmlWriter.newline()
|
|
|
|
def xmlRead(self, attrs, content, font):
|
|
return safeEval(attrs["value"])
|
|
|
|
|
|
class VarIdxMapValue(BaseConverter):
|
|
|
|
def read(self, reader, font, tableDict):
|
|
fmt = tableDict['EntryFormat']
|
|
nItems = tableDict['MappingCount']
|
|
|
|
innerBits = 1 + (fmt & 0x000F)
|
|
innerMask = (1<<innerBits) - 1
|
|
outerMask = 0xFFFFFFFF - innerMask
|
|
outerShift = 16 - innerBits
|
|
|
|
entrySize = 1 + ((fmt & 0x0030) >> 4)
|
|
read = {
|
|
1: reader.readUInt8,
|
|
2: reader.readUShort,
|
|
3: reader.readUInt24,
|
|
4: reader.readULong,
|
|
}[entrySize]
|
|
|
|
mapping = []
|
|
for i in range(nItems):
|
|
raw = read()
|
|
idx = ((raw & outerMask) << outerShift) | (raw & innerMask)
|
|
mapping.append(idx)
|
|
|
|
return mapping
|
|
|
|
def write(self, writer, font, tableDict, value, repeatIndex=None):
|
|
fmt = tableDict['EntryFormat']
|
|
mapping = value
|
|
writer['MappingCount'].setValue(len(mapping))
|
|
|
|
innerBits = 1 + (fmt & 0x000F)
|
|
innerMask = (1<<innerBits) - 1
|
|
outerShift = 16 - innerBits
|
|
|
|
entrySize = 1 + ((fmt & 0x0030) >> 4)
|
|
write = {
|
|
1: writer.writeUInt8,
|
|
2: writer.writeUShort,
|
|
3: writer.writeUInt24,
|
|
4: writer.writeULong,
|
|
}[entrySize]
|
|
|
|
for idx in mapping:
|
|
raw = ((idx & 0xFFFF0000) >> outerShift) | (idx & innerMask)
|
|
write(raw)
|
|
|
|
|
|
class VarDataValue(BaseConverter):
|
|
|
|
def read(self, reader, font, tableDict):
|
|
values = []
|
|
|
|
regionCount = tableDict["VarRegionCount"]
|
|
shortCount = tableDict["NumShorts"]
|
|
|
|
for i in range(min(regionCount, shortCount)):
|
|
values.append(reader.readShort())
|
|
for i in range(min(regionCount, shortCount), regionCount):
|
|
values.append(reader.readInt8())
|
|
for i in range(regionCount, shortCount):
|
|
reader.readInt8()
|
|
|
|
return values
|
|
|
|
def write(self, writer, font, tableDict, value, repeatIndex=None):
|
|
regionCount = tableDict["VarRegionCount"]
|
|
shortCount = tableDict["NumShorts"]
|
|
|
|
for i in range(min(regionCount, shortCount)):
|
|
writer.writeShort(value[i])
|
|
for i in range(min(regionCount, shortCount), regionCount):
|
|
writer.writeInt8(value[i])
|
|
for i in range(regionCount, shortCount):
|
|
writer.writeInt8(0)
|
|
|
|
def xmlWrite(self, xmlWriter, font, value, name, attrs):
|
|
xmlWriter.simpletag(name, attrs + [("value", value)])
|
|
xmlWriter.newline()
|
|
|
|
def xmlRead(self, attrs, content, font):
|
|
return safeEval(attrs["value"])
|
|
|
|
|
|
converterMapping = {
|
|
# type class
|
|
"int8": Int8,
|
|
"int16": Short,
|
|
"uint8": UInt8,
|
|
"uint8": UInt8,
|
|
"uint16": UShort,
|
|
"uint24": UInt24,
|
|
"uint32": ULong,
|
|
"Version": Version,
|
|
"Tag": Tag,
|
|
"GlyphID": GlyphID,
|
|
"NameID": NameID,
|
|
"DeciPoints": DeciPoints,
|
|
"Fixed": Fixed,
|
|
"F2Dot14": F2Dot14,
|
|
"struct": Struct,
|
|
"Offset": Table,
|
|
"LOffset": LTable,
|
|
"ValueRecord": ValueRecord,
|
|
"DeltaValue": DeltaValue,
|
|
"VarIdxMapValue": VarIdxMapValue,
|
|
"VarDataValue": VarDataValue,
|
|
# "Template" types
|
|
"OffsetTo": lambda C: partial(Table, tableClass=C),
|
|
"LOffsetTo": lambda C: partial(LTable, tableClass=C),
|
|
}
|