/usr/lib/python2.7/dist-packages/FontTools/fontTools/ttLib/tables/otBase.py is in fonttools 3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 | from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from .DefaultTable import DefaultTable
import struct
class OverflowErrorRecord(object):
def __init__(self, overflowTuple):
self.tableType = overflowTuple[0]
self.LookupListIndex = overflowTuple[1]
self.SubTableIndex = overflowTuple[2]
self.itemName = overflowTuple[3]
self.itemIndex = overflowTuple[4]
def __repr__(self):
return str((self.tableType, "LookupIndex:", self.LookupListIndex, "SubTableIndex:", self.SubTableIndex, "ItemName:", self.itemName, "ItemIndex:", self.itemIndex))
class OTLOffsetOverflowError(Exception):
def __init__(self, overflowErrorRecord):
self.value = overflowErrorRecord
def __str__(self):
return repr(self.value)
class BaseTTXConverter(DefaultTable):
"""Generic base class for TTX table converters. It functions as an
adapter between the TTX (ttLib actually) table model and the model
we use for OpenType tables, which is necessarily subtly different.
"""
def decompile(self, data, font):
from . import otTables
cachingStats = None if True else {}
class GlobalState(object):
def __init__(self, tableType, cachingStats):
self.tableType = tableType
self.cachingStats = cachingStats
globalState = GlobalState(tableType=self.tableTag,
cachingStats=cachingStats)
reader = OTTableReader(data, globalState)
tableClass = getattr(otTables, self.tableTag)
self.table = tableClass()
self.table.decompile(reader, font)
if cachingStats:
stats = sorted([(v, k) for k, v in cachingStats.items()])
stats.reverse()
print("cachingsstats for ", self.tableTag)
for v, k in stats:
if v < 2:
break
print(v, k)
print("---", len(stats))
def compile(self, font):
""" Create a top-level OTFWriter for the GPOS/GSUB table.
Call the compile method for the the table
for each 'converter' record in the table converter list
call converter's write method for each item in the value.
- For simple items, the write method adds a string to the
writer's self.items list.
- For Struct/Table/Subtable items, it add first adds new writer to the
to the writer's self.items, then calls the item's compile method.
This creates a tree of writers, rooted at the GUSB/GPOS writer, with
each writer representing a table, and the writer.items list containing
the child data strings and writers.
call the getAllData method
call _doneWriting, which removes duplicates
call _gatherTables. This traverses the tables, adding unique occurences to a flat list of tables
Traverse the flat list of tables, calling getDataLength on each to update their position
Traverse the flat list of tables again, calling getData each get the data in the table, now that
pos's and offset are known.
If a lookup subtable overflows an offset, we have to start all over.
"""
class GlobalState(object):
def __init__(self, tableType):
self.tableType = tableType
globalState = GlobalState(tableType=self.tableTag)
overflowRecord = None
while True:
try:
writer = OTTableWriter(globalState)
self.table.compile(writer, font)
return writer.getAllData()
except OTLOffsetOverflowError as e:
if overflowRecord == e.value:
raise # Oh well...
overflowRecord = e.value
print("Attempting to fix OTLOffsetOverflowError", e)
lastItem = overflowRecord
ok = 0
if overflowRecord.itemName is None:
from .otTables import fixLookupOverFlows
ok = fixLookupOverFlows(font, overflowRecord)
else:
from .otTables import fixSubTableOverFlows
ok = fixSubTableOverFlows(font, overflowRecord)
if not ok:
raise
def toXML(self, writer, font):
self.table.toXML2(writer, font)
def fromXML(self, name, attrs, content, font):
from . import otTables
if not hasattr(self, "table"):
tableClass = getattr(otTables, self.tableTag)
self.table = tableClass()
self.table.fromXML(name, attrs, content, font)
class OTTableReader(object):
"""Helper class to retrieve data from an OpenType table."""
__slots__ = ('data', 'offset', 'pos', 'globalState', 'localState')
def __init__(self, data, globalState={}, localState=None, offset=0):
self.data = data
self.offset = offset
self.pos = offset
self.globalState = globalState
self.localState = localState
def advance(self, count):
self.pos += count
def seek(self, pos):
self.pos = pos
def copy(self):
other = self.__class__(self.data, self.globalState, self.localState, self.offset)
other.pos = self.pos
return other
def getSubReader(self, offset):
offset = self.offset + offset
cachingStats = self.globalState.cachingStats
if cachingStats is not None:
cachingStats[offset] = cachingStats.get(offset, 0) + 1
return self.__class__(self.data, self.globalState, self.localState, offset)
def readUShort(self):
pos = self.pos
newpos = pos + 2
value, = struct.unpack(">H", self.data[pos:newpos])
self.pos = newpos
return value
def readShort(self):
pos = self.pos
newpos = pos + 2
value, = struct.unpack(">h", self.data[pos:newpos])
self.pos = newpos
return value
def readLong(self):
pos = self.pos
newpos = pos + 4
value, = struct.unpack(">l", self.data[pos:newpos])
self.pos = newpos
return value
def readUInt24(self):
pos = self.pos
newpos = pos + 3
value, = struct.unpack(">l", b'\0'+self.data[pos:newpos])
self.pos = newpos
return value
def readULong(self):
pos = self.pos
newpos = pos + 4
value, = struct.unpack(">L", self.data[pos:newpos])
self.pos = newpos
return value
def readTag(self):
pos = self.pos
newpos = pos + 4
value = Tag(self.data[pos:newpos])
assert len(value) == 4
self.pos = newpos
return value
def readData(self, count):
pos = self.pos
newpos = pos + count
value = self.data[pos:newpos]
self.pos = newpos
return value
def __setitem__(self, name, value):
state = self.localState.copy() if self.localState else dict()
state[name] = value
self.localState = state
def __getitem__(self, name):
return self.localState and self.localState[name]
def __contains__(self, name):
return self.localState and name in self.localState
class OTTableWriter(object):
"""Helper class to gather and assemble data for OpenType tables."""
def __init__(self, globalState, localState=None):
self.items = []
self.pos = None
self.globalState = globalState
self.localState = localState
self.longOffset = False
self.parent = None
def __setitem__(self, name, value):
state = self.localState.copy() if self.localState else dict()
state[name] = value
self.localState = state
def __getitem__(self, name):
return self.localState[name]
# assembler interface
def getAllData(self):
"""Assemble all data, including all subtables."""
self._doneWriting()
tables, extTables = self._gatherTables()
tables.reverse()
extTables.reverse()
# Gather all data in two passes: the absolute positions of all
# subtable are needed before the actual data can be assembled.
pos = 0
for table in tables:
table.pos = pos
pos = pos + table.getDataLength()
for table in extTables:
table.pos = pos
pos = pos + table.getDataLength()
data = []
for table in tables:
tableData = table.getData()
data.append(tableData)
for table in extTables:
tableData = table.getData()
data.append(tableData)
return bytesjoin(data)
def getDataLength(self):
"""Return the length of this table in bytes, without subtables."""
l = 0
for item in self.items:
if hasattr(item, "getData") or hasattr(item, "getCountData"):
if item.longOffset:
l = l + 4 # sizeof(ULong)
else:
l = l + 2 # sizeof(UShort)
else:
l = l + len(item)
return l
def getData(self):
"""Assemble the data for this writer/table, without subtables."""
items = list(self.items) # make a shallow copy
pos = self.pos
numItems = len(items)
for i in range(numItems):
item = items[i]
if hasattr(item, "getData"):
if item.longOffset:
items[i] = packULong(item.pos - pos)
else:
try:
items[i] = packUShort(item.pos - pos)
except struct.error:
# provide data to fix overflow problem.
# If the overflow is to a lookup, or from a lookup to a subtable,
# just report the current item. Otherwise...
if self.name not in [ 'LookupList', 'Lookup']:
# overflow is within a subTable. Life is more complicated.
# If we split the sub-table just before the current item, we may still suffer overflow.
# This is because duplicate table merging is done only within an Extension subTable tree;
# when we split the subtable in two, some items may no longer be duplicates.
# Get worst case by adding up all the item lengths, depth first traversal.
# and then report the first item that overflows a short.
def getDeepItemLength(table):
if hasattr(table, "getDataLength"):
length = 0
for item in table.items:
length = length + getDeepItemLength(item)
else:
length = len(table)
return length
length = self.getDataLength()
if hasattr(self, "sortCoverageLast") and item.name == "Coverage":
# Coverage is first in the item list, but last in the table list,
# The original overflow is really in the item list. Skip the Coverage
# table in the following test.
items = items[i+1:]
for j in range(len(items)):
item = items[j]
length = length + getDeepItemLength(item)
if length > 65535:
break
overflowErrorRecord = self.getOverflowErrorRecord(item)
raise OTLOffsetOverflowError(overflowErrorRecord)
return bytesjoin(items)
def __hash__(self):
# only works after self._doneWriting() has been called
return hash(self.items)
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
return self.items == other.items
def _doneWriting(self, internedTables=None):
# Convert CountData references to data string items
# collapse duplicate table references to a unique entry
# "tables" are OTTableWriter objects.
# For Extension Lookup types, we can
# eliminate duplicates only within the tree under the Extension Lookup,
# as offsets may exceed 64K even between Extension LookupTable subtables.
if internedTables is None:
internedTables = {}
items = self.items
iRange = list(range(len(items)))
if hasattr(self, "Extension"):
newTree = 1
else:
newTree = 0
for i in iRange:
item = items[i]
if hasattr(item, "getCountData"):
items[i] = item.getCountData()
elif hasattr(item, "getData"):
if newTree:
item._doneWriting()
else:
item._doneWriting(internedTables)
internedItem = internedTables.get(item)
if internedItem:
items[i] = item = internedItem
else:
internedTables[item] = item
self.items = tuple(items)
def _gatherTables(self, tables=None, extTables=None, done=None):
# Convert table references in self.items tree to a flat
# list of tables in depth-first traversal order.
# "tables" are OTTableWriter objects.
# We do the traversal in reverse order at each level, in order to
# resolve duplicate references to be the last reference in the list of tables.
# For extension lookups, duplicate references can be merged only within the
# writer tree under the extension lookup.
if tables is None: # init call for first time.
tables = []
extTables = []
done = {}
done[self] = 1
numItems = len(self.items)
iRange = list(range(numItems))
iRange.reverse()
if hasattr(self, "Extension"):
appendExtensions = 1
else:
appendExtensions = 0
# add Coverage table if it is sorted last.
sortCoverageLast = 0
if hasattr(self, "sortCoverageLast"):
# Find coverage table
for i in range(numItems):
item = self.items[i]
if hasattr(item, "name") and (item.name == "Coverage"):
sortCoverageLast = 1
break
if item not in done:
item._gatherTables(tables, extTables, done)
else:
# We're a new parent of item
pass
for i in iRange:
item = self.items[i]
if not hasattr(item, "getData"):
continue
if sortCoverageLast and (i==1) and item.name == 'Coverage':
# we've already 'gathered' it above
continue
if appendExtensions:
assert extTables is not None, "Program or XML editing error. Extension subtables cannot contain extensions subtables"
newDone = {}
item._gatherTables(extTables, None, newDone)
elif item not in done:
item._gatherTables(tables, extTables, done)
else:
# We're a new parent of item
pass
tables.append(self)
return tables, extTables
# interface for gathering data, as used by table.compile()
def getSubWriter(self):
subwriter = self.__class__(self.globalState, self.localState)
subwriter.parent = self # because some subtables have idential values, we discard
# the duplicates under the getAllData method. Hence some
# subtable writers can have more than one parent writer.
# But we just care about first one right now.
return subwriter
def writeUShort(self, value):
assert 0 <= value < 0x10000
self.items.append(struct.pack(">H", value))
def writeShort(self, value):
self.items.append(struct.pack(">h", value))
def writeUInt24(self, value):
assert 0 <= value < 0x1000000
b = struct.pack(">L", value)
self.items.append(b[1:])
def writeLong(self, value):
self.items.append(struct.pack(">l", value))
def writeULong(self, value):
self.items.append(struct.pack(">L", value))
def writeTag(self, tag):
tag = Tag(tag).tobytes()
assert len(tag) == 4
self.items.append(tag)
def writeSubTable(self, subWriter):
self.items.append(subWriter)
def writeCountReference(self, table, name):
ref = CountReference(table, name)
self.items.append(ref)
return ref
def writeStruct(self, format, values):
data = struct.pack(*(format,) + values)
self.items.append(data)
def writeData(self, data):
self.items.append(data)
def getOverflowErrorRecord(self, item):
LookupListIndex = SubTableIndex = itemName = itemIndex = None
if self.name == 'LookupList':
LookupListIndex = item.repeatIndex
elif self.name == 'Lookup':
LookupListIndex = self.repeatIndex
SubTableIndex = item.repeatIndex
else:
itemName = item.name
if hasattr(item, 'repeatIndex'):
itemIndex = item.repeatIndex
if self.name == 'SubTable':
LookupListIndex = self.parent.repeatIndex
SubTableIndex = self.repeatIndex
elif self.name == 'ExtSubTable':
LookupListIndex = self.parent.parent.repeatIndex
SubTableIndex = self.parent.repeatIndex
else: # who knows how far below the SubTable level we are! Climb back up to the nearest subtable.
itemName = ".".join([self.name, item.name])
p1 = self.parent
while p1 and p1.name not in ['ExtSubTable', 'SubTable']:
itemName = ".".join([p1.name, item.name])
p1 = p1.parent
if p1:
if p1.name == 'ExtSubTable':
LookupListIndex = p1.parent.parent.repeatIndex
SubTableIndex = p1.parent.repeatIndex
else:
LookupListIndex = p1.parent.repeatIndex
SubTableIndex = p1.repeatIndex
return OverflowErrorRecord( (self.globalState.tableType, LookupListIndex, SubTableIndex, itemName, itemIndex) )
class CountReference(object):
"""A reference to a Count value, not a count of references."""
def __init__(self, table, name):
self.table = table
self.name = name
def setValue(self, value):
table = self.table
name = self.name
if table[name] is None:
table[name] = value
else:
assert table[name] == value, (name, table[name], value)
def getCountData(self):
return packUShort(self.table[self.name])
def packUShort(value):
return struct.pack(">H", value)
def packULong(value):
assert 0 <= value < 0x100000000, value
return struct.pack(">L", value)
class BaseTable(object):
"""Generic base class for all OpenType (sub)tables."""
def __getattr__(self, attr):
reader = self.__dict__.get("reader")
if reader:
del self.reader
font = self.font
del self.font
self.decompile(reader, font)
return getattr(self, attr)
raise AttributeError(attr)
def ensureDecompiled(self):
reader = self.__dict__.get("reader")
if reader:
del self.reader
font = self.font
del self.font
self.decompile(reader, font)
@classmethod
def getRecordSize(cls, reader):
totalSize = 0
for conv in cls.converters:
size = conv.getRecordSize(reader)
if size is NotImplemented: return NotImplemented
countValue = 1
if conv.repeat:
if conv.repeat in reader:
countValue = reader[conv.repeat]
else:
return NotImplemented
totalSize += size * countValue
return totalSize
def getConverters(self):
return self.converters
def getConverterByName(self, name):
return self.convertersByName[name]
def decompile(self, reader, font):
self.readFormat(reader)
table = {}
self.__rawTable = table # for debugging
converters = self.getConverters()
for conv in converters:
if conv.name == "SubTable":
conv = conv.getConverter(reader.globalState.tableType,
table["LookupType"])
if conv.name == "ExtSubTable":
conv = conv.getConverter(reader.globalState.tableType,
table["ExtensionLookupType"])
if conv.name == "FeatureParams":
conv = conv.getConverter(reader["FeatureTag"])
if conv.repeat:
if conv.repeat in table:
countValue = table[conv.repeat]
else:
# conv.repeat is a propagated count
countValue = reader[conv.repeat]
countValue += conv.aux
table[conv.name] = conv.readArray(reader, font, table, countValue)
else:
if conv.aux and not eval(conv.aux, None, table):
continue
table[conv.name] = conv.read(reader, font, table)
if conv.isPropagated:
reader[conv.name] = table[conv.name]
self.postRead(table, font)
del self.__rawTable # succeeded, get rid of debugging info
def compile(self, writer, font):
self.ensureDecompiled()
table = self.preWrite(font)
if hasattr(self, 'sortCoverageLast'):
writer.sortCoverageLast = 1
if hasattr(self.__class__, 'LookupType'):
writer['LookupType'].setValue(self.__class__.LookupType)
self.writeFormat(writer)
for conv in self.getConverters():
value = table.get(conv.name)
if conv.repeat:
if value is None:
value = []
countValue = len(value) - conv.aux
if conv.repeat in table:
CountReference(table, conv.repeat).setValue(countValue)
else:
# conv.repeat is a propagated count
writer[conv.repeat].setValue(countValue)
conv.writeArray(writer, font, table, value)
elif conv.isCount:
# Special-case Count values.
# Assumption: a Count field will *always* precede
# the actual array(s).
# We need a default value, as it may be set later by a nested
# table. We will later store it here.
# We add a reference: by the time the data is assembled
# the Count value will be filled in.
ref = writer.writeCountReference(table, conv.name)
table[conv.name] = None
if conv.isPropagated:
writer[conv.name] = ref
elif conv.isLookupType:
ref = writer.writeCountReference(table, conv.name)
table[conv.name] = None
writer['LookupType'] = ref
else:
if conv.aux and not eval(conv.aux, None, table):
continue
conv.write(writer, font, table, value)
if conv.isPropagated:
writer[conv.name] = value
def readFormat(self, reader):
pass
def writeFormat(self, writer):
pass
def postRead(self, table, font):
self.__dict__.update(table)
def preWrite(self, font):
return self.__dict__.copy()
def toXML(self, xmlWriter, font, attrs=None, name=None):
tableName = name if name else self.__class__.__name__
if attrs is None:
attrs = []
if hasattr(self, "Format"):
attrs = attrs + [("Format", self.Format)]
xmlWriter.begintag(tableName, attrs)
xmlWriter.newline()
self.toXML2(xmlWriter, font)
xmlWriter.endtag(tableName)
xmlWriter.newline()
def toXML2(self, xmlWriter, font):
# Simpler variant of toXML, *only* for the top level tables (like GPOS, GSUB).
# This is because in TTX our parent writes our main tag, and in otBase.py we
# do it ourselves. I think I'm getting schizophrenic...
for conv in self.getConverters():
if conv.repeat:
value = getattr(self, conv.name)
for i in range(len(value)):
item = value[i]
conv.xmlWrite(xmlWriter, font, item, conv.name,
[("index", i)])
else:
if conv.aux and not eval(conv.aux, None, vars(self)):
continue
value = getattr(self, conv.name)
conv.xmlWrite(xmlWriter, font, value, conv.name, [])
def fromXML(self, name, attrs, content, font):
try:
conv = self.getConverterByName(name)
except KeyError:
raise # XXX on KeyError, raise nice error
value = conv.xmlRead(attrs, content, font)
if conv.repeat:
seq = getattr(self, conv.name, None)
if seq is None:
seq = []
setattr(self, conv.name, seq)
seq.append(value)
else:
setattr(self, conv.name, value)
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
self.ensureDecompiled()
other.ensureDecompiled()
return self.__dict__ == other.__dict__
class FormatSwitchingBaseTable(BaseTable):
"""Minor specialization of BaseTable, for tables that have multiple
formats, eg. CoverageFormat1 vs. CoverageFormat2."""
@classmethod
def getRecordSize(cls, reader):
return NotImplemented
def getConverters(self):
return self.converters[self.Format]
def getConverterByName(self, name):
return self.convertersByName[self.Format][name]
def readFormat(self, reader):
self.Format = reader.readUShort()
assert self.Format != 0, (self, reader.pos, len(reader.data))
def writeFormat(self, writer):
writer.writeUShort(self.Format)
def toXML(self, xmlWriter, font, attrs=None, name=None):
BaseTable.toXML(self, xmlWriter, font, attrs, name=self.__class__.__name__)
#
# Support for ValueRecords
#
# This data type is so different from all other OpenType data types that
# it requires quite a bit of code for itself. It even has special support
# in OTTableReader and OTTableWriter...
#
valueRecordFormat = [
# Mask Name isDevice signed
(0x0001, "XPlacement", 0, 1),
(0x0002, "YPlacement", 0, 1),
(0x0004, "XAdvance", 0, 1),
(0x0008, "YAdvance", 0, 1),
(0x0010, "XPlaDevice", 1, 0),
(0x0020, "YPlaDevice", 1, 0),
(0x0040, "XAdvDevice", 1, 0),
(0x0080, "YAdvDevice", 1, 0),
# reserved:
(0x0100, "Reserved1", 0, 0),
(0x0200, "Reserved2", 0, 0),
(0x0400, "Reserved3", 0, 0),
(0x0800, "Reserved4", 0, 0),
(0x1000, "Reserved5", 0, 0),
(0x2000, "Reserved6", 0, 0),
(0x4000, "Reserved7", 0, 0),
(0x8000, "Reserved8", 0, 0),
]
def _buildDict():
d = {}
for mask, name, isDevice, signed in valueRecordFormat:
d[name] = mask, isDevice, signed
return d
valueRecordFormatDict = _buildDict()
class ValueRecordFactory(object):
"""Given a format code, this object convert ValueRecords."""
def __init__(self, valueFormat):
format = []
for mask, name, isDevice, signed in valueRecordFormat:
if valueFormat & mask:
format.append((name, isDevice, signed))
self.format = format
def __len__(self):
return len(self.format)
def readValueRecord(self, reader, font):
format = self.format
if not format:
return None
valueRecord = ValueRecord()
for name, isDevice, signed in format:
if signed:
value = reader.readShort()
else:
value = reader.readUShort()
if isDevice:
if value:
from . import otTables
subReader = reader.getSubReader(value)
value = getattr(otTables, name)()
value.decompile(subReader, font)
else:
value = None
setattr(valueRecord, name, value)
return valueRecord
def writeValueRecord(self, writer, font, valueRecord):
for name, isDevice, signed in self.format:
value = getattr(valueRecord, name, 0)
if isDevice:
if value:
subWriter = writer.getSubWriter()
writer.writeSubTable(subWriter)
value.compile(subWriter, font)
else:
writer.writeUShort(0)
elif signed:
writer.writeShort(value)
else:
writer.writeUShort(value)
class ValueRecord(object):
# see ValueRecordFactory
def getFormat(self):
format = 0
for name in self.__dict__.keys():
format = format | valueRecordFormatDict[name][0]
return format
def toXML(self, xmlWriter, font, valueName, attrs=None):
if attrs is None:
simpleItems = []
else:
simpleItems = list(attrs)
for mask, name, isDevice, format in valueRecordFormat[:4]: # "simple" values
if hasattr(self, name):
simpleItems.append((name, getattr(self, name)))
deviceItems = []
for mask, name, isDevice, format in valueRecordFormat[4:8]: # device records
if hasattr(self, name):
device = getattr(self, name)
if device is not None:
deviceItems.append((name, device))
if deviceItems:
xmlWriter.begintag(valueName, simpleItems)
xmlWriter.newline()
for name, deviceRecord in deviceItems:
if deviceRecord is not None:
deviceRecord.toXML(xmlWriter, font)
xmlWriter.endtag(valueName)
xmlWriter.newline()
else:
xmlWriter.simpletag(valueName, simpleItems)
xmlWriter.newline()
def fromXML(self, name, attrs, content, font):
from . import otTables
for k, v in attrs.items():
setattr(self, k, int(v))
for element in content:
if not isinstance(element, tuple):
continue
name, attrs, content = element
value = getattr(otTables, name)()
for elem2 in content:
if not isinstance(elem2, tuple):
continue
name2, attrs2, content2 = elem2
value.fromXML(name2, attrs2, content2, font)
setattr(self, name, value)
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
return self.__dict__ == other.__dict__
|