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fonttools/Lib/fontTools/ttLib/tables/O_S_2f_2.py
Khaled Hosny be8ec35934 [OS/2] Add recalcCodePageRanges 
Ported from the ufo2ft code (which is port from FontForge code), with
some additional functions for parity with recalcUnicodeRanges.
2023-11-11 01:54:00 +02:00

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from fontTools.misc import sstruct
from fontTools.misc.roundTools import otRound
from fontTools.misc.textTools import safeEval, num2binary, binary2num
from fontTools.ttLib.tables import DefaultTable
import bisect
import logging
log = logging.getLogger(__name__)
# panose classification
panoseFormat = """
bFamilyType: B
bSerifStyle: B
bWeight: B
bProportion: B
bContrast: B
bStrokeVariation: B
bArmStyle: B
bLetterForm: B
bMidline: B
bXHeight: B
"""
class Panose(object):
def __init__(self, **kwargs):
_, names, _ = sstruct.getformat(panoseFormat)
for name in names:
setattr(self, name, kwargs.pop(name, 0))
for k in kwargs:
raise TypeError(f"Panose() got an unexpected keyword argument {k!r}")
def toXML(self, writer, ttFont):
formatstring, names, fixes = sstruct.getformat(panoseFormat)
for name in names:
writer.simpletag(name, value=getattr(self, name))
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
setattr(self, name, safeEval(attrs["value"]))
# 'sfnt' OS/2 and Windows Metrics table - 'OS/2'
OS2_format_0 = """
> # big endian
version: H # version
xAvgCharWidth: h # average character width
usWeightClass: H # degree of thickness of strokes
usWidthClass: H # aspect ratio
fsType: H # type flags
ySubscriptXSize: h # subscript horizontal font size
ySubscriptYSize: h # subscript vertical font size
ySubscriptXOffset: h # subscript x offset
ySubscriptYOffset: h # subscript y offset
ySuperscriptXSize: h # superscript horizontal font size
ySuperscriptYSize: h # superscript vertical font size
ySuperscriptXOffset: h # superscript x offset
ySuperscriptYOffset: h # superscript y offset
yStrikeoutSize: h # strikeout size
yStrikeoutPosition: h # strikeout position
sFamilyClass: h # font family class and subclass
panose: 10s # panose classification number
ulUnicodeRange1: L # character range
ulUnicodeRange2: L # character range
ulUnicodeRange3: L # character range
ulUnicodeRange4: L # character range
achVendID: 4s # font vendor identification
fsSelection: H # font selection flags
usFirstCharIndex: H # first unicode character index
usLastCharIndex: H # last unicode character index
sTypoAscender: h # typographic ascender
sTypoDescender: h # typographic descender
sTypoLineGap: h # typographic line gap
usWinAscent: H # Windows ascender
usWinDescent: H # Windows descender
"""
OS2_format_1_addition = """
ulCodePageRange1: L
ulCodePageRange2: L
"""
OS2_format_2_addition = (
OS2_format_1_addition
+ """
sxHeight: h
sCapHeight: h
usDefaultChar: H
usBreakChar: H
usMaxContext: H
"""
)
OS2_format_5_addition = (
OS2_format_2_addition
+ """
usLowerOpticalPointSize: H
usUpperOpticalPointSize: H
"""
)
bigendian = " > # big endian\n"
OS2_format_1 = OS2_format_0 + OS2_format_1_addition
OS2_format_2 = OS2_format_0 + OS2_format_2_addition
OS2_format_5 = OS2_format_0 + OS2_format_5_addition
OS2_format_1_addition = bigendian + OS2_format_1_addition
OS2_format_2_addition = bigendian + OS2_format_2_addition
OS2_format_5_addition = bigendian + OS2_format_5_addition
class table_O_S_2f_2(DefaultTable.DefaultTable):
"""the OS/2 table"""
dependencies = ["head"]
def decompile(self, data, ttFont):
dummy, data = sstruct.unpack2(OS2_format_0, data, self)
if self.version == 1:
dummy, data = sstruct.unpack2(OS2_format_1_addition, data, self)
elif self.version in (2, 3, 4):
dummy, data = sstruct.unpack2(OS2_format_2_addition, data, self)
elif self.version == 5:
dummy, data = sstruct.unpack2(OS2_format_5_addition, data, self)
self.usLowerOpticalPointSize /= 20
self.usUpperOpticalPointSize /= 20
elif self.version != 0:
from fontTools import ttLib
raise ttLib.TTLibError(
"unknown format for OS/2 table: version %s" % self.version
)
if len(data):
log.warning("too much 'OS/2' table data")
self.panose = sstruct.unpack(panoseFormat, self.panose, Panose())
def compile(self, ttFont):
self.updateFirstAndLastCharIndex(ttFont)
panose = self.panose
head = ttFont["head"]
if (self.fsSelection & 1) and not (head.macStyle & 1 << 1):
log.warning(
"fsSelection bit 0 (italic) and "
"head table macStyle bit 1 (italic) should match"
)
if (self.fsSelection & 1 << 5) and not (head.macStyle & 1):
log.warning(
"fsSelection bit 5 (bold) and "
"head table macStyle bit 0 (bold) should match"
)
if (self.fsSelection & 1 << 6) and (self.fsSelection & 1 + (1 << 5)):
log.warning(
"fsSelection bit 6 (regular) is set, "
"bits 0 (italic) and 5 (bold) must be clear"
)
if self.version < 4 and self.fsSelection & 0b1110000000:
log.warning(
"fsSelection bits 7, 8 and 9 are only defined in "
"OS/2 table version 4 and up: version %s",
self.version,
)
self.panose = sstruct.pack(panoseFormat, self.panose)
if self.version == 0:
data = sstruct.pack(OS2_format_0, self)
elif self.version == 1:
data = sstruct.pack(OS2_format_1, self)
elif self.version in (2, 3, 4):
data = sstruct.pack(OS2_format_2, self)
elif self.version == 5:
d = self.__dict__.copy()
d["usLowerOpticalPointSize"] = round(self.usLowerOpticalPointSize * 20)
d["usUpperOpticalPointSize"] = round(self.usUpperOpticalPointSize * 20)
data = sstruct.pack(OS2_format_5, d)
else:
from fontTools import ttLib
raise ttLib.TTLibError(
"unknown format for OS/2 table: version %s" % self.version
)
self.panose = panose
return data
def toXML(self, writer, ttFont):
writer.comment(
"The fields 'usFirstCharIndex' and 'usLastCharIndex'\n"
"will be recalculated by the compiler"
)
writer.newline()
if self.version == 1:
format = OS2_format_1
elif self.version in (2, 3, 4):
format = OS2_format_2
elif self.version == 5:
format = OS2_format_5
else:
format = OS2_format_0
formatstring, names, fixes = sstruct.getformat(format)
for name in names:
value = getattr(self, name)
if name == "panose":
writer.begintag("panose")
writer.newline()
value.toXML(writer, ttFont)
writer.endtag("panose")
elif name in (
"ulUnicodeRange1",
"ulUnicodeRange2",
"ulUnicodeRange3",
"ulUnicodeRange4",
"ulCodePageRange1",
"ulCodePageRange2",
):
writer.simpletag(name, value=num2binary(value))
elif name in ("fsType", "fsSelection"):
writer.simpletag(name, value=num2binary(value, 16))
elif name == "achVendID":
writer.simpletag(name, value=repr(value)[1:-1])
else:
writer.simpletag(name, value=value)
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name == "panose":
self.panose = panose = Panose()
for element in content:
if isinstance(element, tuple):
name, attrs, content = element
panose.fromXML(name, attrs, content, ttFont)
elif name in (
"ulUnicodeRange1",
"ulUnicodeRange2",
"ulUnicodeRange3",
"ulUnicodeRange4",
"ulCodePageRange1",
"ulCodePageRange2",
"fsType",
"fsSelection",
):
setattr(self, name, binary2num(attrs["value"]))
elif name == "achVendID":
setattr(self, name, safeEval("'''" + attrs["value"] + "'''"))
else:
setattr(self, name, safeEval(attrs["value"]))
def updateFirstAndLastCharIndex(self, ttFont):
if "cmap" not in ttFont:
return
codes = set()
for table in getattr(ttFont["cmap"], "tables", []):
if table.isUnicode():
codes.update(table.cmap.keys())
if codes:
minCode = min(codes)
maxCode = max(codes)
# USHORT cannot hold codepoints greater than 0xFFFF
self.usFirstCharIndex = min(0xFFFF, minCode)
self.usLastCharIndex = min(0xFFFF, maxCode)
# misspelled attributes kept for legacy reasons
@property
def usMaxContex(self):
return self.usMaxContext
@usMaxContex.setter
def usMaxContex(self, value):
self.usMaxContext = value
@property
def fsFirstCharIndex(self):
return self.usFirstCharIndex
@fsFirstCharIndex.setter
def fsFirstCharIndex(self, value):
self.usFirstCharIndex = value
@property
def fsLastCharIndex(self):
return self.usLastCharIndex
@fsLastCharIndex.setter
def fsLastCharIndex(self, value):
self.usLastCharIndex = value
def getUnicodeRanges(self):
"""Return the set of 'ulUnicodeRange*' bits currently enabled."""
bits = set()
ul1, ul2 = self.ulUnicodeRange1, self.ulUnicodeRange2
ul3, ul4 = self.ulUnicodeRange3, self.ulUnicodeRange4
for i in range(32):
if ul1 & (1 << i):
bits.add(i)
if ul2 & (1 << i):
bits.add(i + 32)
if ul3 & (1 << i):
bits.add(i + 64)
if ul4 & (1 << i):
bits.add(i + 96)
return bits
def setUnicodeRanges(self, bits):
"""Set the 'ulUnicodeRange*' fields to the specified 'bits'."""
ul1, ul2, ul3, ul4 = 0, 0, 0, 0
for bit in bits:
if 0 <= bit < 32:
ul1 |= 1 << bit
elif 32 <= bit < 64:
ul2 |= 1 << (bit - 32)
elif 64 <= bit < 96:
ul3 |= 1 << (bit - 64)
elif 96 <= bit < 123:
ul4 |= 1 << (bit - 96)
else:
raise ValueError("expected 0 <= int <= 122, found: %r" % bit)
self.ulUnicodeRange1, self.ulUnicodeRange2 = ul1, ul2
self.ulUnicodeRange3, self.ulUnicodeRange4 = ul3, ul4
def recalcUnicodeRanges(self, ttFont, pruneOnly=False):
"""Intersect the codepoints in the font's Unicode cmap subtables with
the Unicode block ranges defined in the OpenType specification (v1.7),
and set the respective 'ulUnicodeRange*' bits if there is at least ONE
intersection.
If 'pruneOnly' is True, only clear unused bits with NO intersection.
"""
unicodes = set()
for table in ttFont["cmap"].tables:
if table.isUnicode():
unicodes.update(table.cmap.keys())
if pruneOnly:
empty = intersectUnicodeRanges(unicodes, inverse=True)
bits = self.getUnicodeRanges() - empty
else:
bits = intersectUnicodeRanges(unicodes)
self.setUnicodeRanges(bits)
return bits
def getCodePageRanges(self):
"""Return the set of 'ulCodePageRange*' bits currently enabled."""
bits = set()
ul1, ul2 = self.ulCodePageRange1, self.ulCodePageRange2
for i in range(32):
if ul1 & (1 << i):
bits.add(i)
if ul2 & (1 << i):
bits.add(i + 32)
return bits
def setCodePageRanges(self, bits):
"""Set the 'ulCodePageRange*' fields to the specified 'bits'."""
ul1, ul2 = 0, 0
for bit in bits:
if 0 <= bit < 32:
ul1 |= 1 << bit
elif 32 <= bit < 64:
ul2 |= 1 << (bit - 32)
else:
raise ValueError(f"expected 0 <= int <= 63, found: {bit:r}")
self.ulCodePageRange1, self.ulCodePageRange2 = ul1, ul2
def recalcCodePageRanges(self, ttFont, pruneOnly=False):
unicodes = set()
for table in ttFont["cmap"].tables:
if table.isUnicode():
unicodes.update(table.cmap.keys())
bits = calcCodePageRanges(unicodes)
if pruneOnly:
bits &= self.getCodePageRanges()
# when no codepage ranges can be enabled, fall back to enabling bit 0
# (Latin 1) so that the font works in MS Word:
# https://github.com/googlei18n/fontmake/issues/468
if not bits:
bits = {0}
self.setCodePageRanges(bits)
return bits
def recalcAvgCharWidth(self, ttFont):
"""Recalculate xAvgCharWidth using metrics from ttFont's 'hmtx' table.
Set it to 0 if the unlikely event 'hmtx' table is not found.
"""
avg_width = 0
hmtx = ttFont.get("hmtx")
if hmtx is not None:
widths = [width for width, _ in hmtx.metrics.values() if width > 0]
if widths:
avg_width = otRound(sum(widths) / len(widths))
self.xAvgCharWidth = avg_width
return avg_width
# Unicode ranges data from the OpenType OS/2 table specification v1.7
OS2_UNICODE_RANGES = (
(("Basic Latin", (0x0000, 0x007F)),),
(("Latin-1 Supplement", (0x0080, 0x00FF)),),
(("Latin Extended-A", (0x0100, 0x017F)),),
(("Latin Extended-B", (0x0180, 0x024F)),),
(
("IPA Extensions", (0x0250, 0x02AF)),
("Phonetic Extensions", (0x1D00, 0x1D7F)),
("Phonetic Extensions Supplement", (0x1D80, 0x1DBF)),
),
(
("Spacing Modifier Letters", (0x02B0, 0x02FF)),
("Modifier Tone Letters", (0xA700, 0xA71F)),
),
(
("Combining Diacritical Marks", (0x0300, 0x036F)),
("Combining Diacritical Marks Supplement", (0x1DC0, 0x1DFF)),
),
(("Greek and Coptic", (0x0370, 0x03FF)),),
(("Coptic", (0x2C80, 0x2CFF)),),
(
("Cyrillic", (0x0400, 0x04FF)),
("Cyrillic Supplement", (0x0500, 0x052F)),
("Cyrillic Extended-A", (0x2DE0, 0x2DFF)),
("Cyrillic Extended-B", (0xA640, 0xA69F)),
),
(("Armenian", (0x0530, 0x058F)),),
(("Hebrew", (0x0590, 0x05FF)),),
(("Vai", (0xA500, 0xA63F)),),
(("Arabic", (0x0600, 0x06FF)), ("Arabic Supplement", (0x0750, 0x077F))),
(("NKo", (0x07C0, 0x07FF)),),
(("Devanagari", (0x0900, 0x097F)),),
(("Bengali", (0x0980, 0x09FF)),),
(("Gurmukhi", (0x0A00, 0x0A7F)),),
(("Gujarati", (0x0A80, 0x0AFF)),),
(("Oriya", (0x0B00, 0x0B7F)),),
(("Tamil", (0x0B80, 0x0BFF)),),
(("Telugu", (0x0C00, 0x0C7F)),),
(("Kannada", (0x0C80, 0x0CFF)),),
(("Malayalam", (0x0D00, 0x0D7F)),),
(("Thai", (0x0E00, 0x0E7F)),),
(("Lao", (0x0E80, 0x0EFF)),),
(("Georgian", (0x10A0, 0x10FF)), ("Georgian Supplement", (0x2D00, 0x2D2F))),
(("Balinese", (0x1B00, 0x1B7F)),),
(("Hangul Jamo", (0x1100, 0x11FF)),),
(
("Latin Extended Additional", (0x1E00, 0x1EFF)),
("Latin Extended-C", (0x2C60, 0x2C7F)),
("Latin Extended-D", (0xA720, 0xA7FF)),
),
(("Greek Extended", (0x1F00, 0x1FFF)),),
(
("General Punctuation", (0x2000, 0x206F)),
("Supplemental Punctuation", (0x2E00, 0x2E7F)),
),
(("Superscripts And Subscripts", (0x2070, 0x209F)),),
(("Currency Symbols", (0x20A0, 0x20CF)),),
(("Combining Diacritical Marks For Symbols", (0x20D0, 0x20FF)),),
(("Letterlike Symbols", (0x2100, 0x214F)),),
(("Number Forms", (0x2150, 0x218F)),),
(
("Arrows", (0x2190, 0x21FF)),
("Supplemental Arrows-A", (0x27F0, 0x27FF)),
("Supplemental Arrows-B", (0x2900, 0x297F)),
("Miscellaneous Symbols and Arrows", (0x2B00, 0x2BFF)),
),
(
("Mathematical Operators", (0x2200, 0x22FF)),
("Supplemental Mathematical Operators", (0x2A00, 0x2AFF)),
("Miscellaneous Mathematical Symbols-A", (0x27C0, 0x27EF)),
("Miscellaneous Mathematical Symbols-B", (0x2980, 0x29FF)),
),
(("Miscellaneous Technical", (0x2300, 0x23FF)),),
(("Control Pictures", (0x2400, 0x243F)),),
(("Optical Character Recognition", (0x2440, 0x245F)),),
(("Enclosed Alphanumerics", (0x2460, 0x24FF)),),
(("Box Drawing", (0x2500, 0x257F)),),
(("Block Elements", (0x2580, 0x259F)),),
(("Geometric Shapes", (0x25A0, 0x25FF)),),
(("Miscellaneous Symbols", (0x2600, 0x26FF)),),
(("Dingbats", (0x2700, 0x27BF)),),
(("CJK Symbols And Punctuation", (0x3000, 0x303F)),),
(("Hiragana", (0x3040, 0x309F)),),
(
("Katakana", (0x30A0, 0x30FF)),
("Katakana Phonetic Extensions", (0x31F0, 0x31FF)),
),
(("Bopomofo", (0x3100, 0x312F)), ("Bopomofo Extended", (0x31A0, 0x31BF))),
(("Hangul Compatibility Jamo", (0x3130, 0x318F)),),
(("Phags-pa", (0xA840, 0xA87F)),),
(("Enclosed CJK Letters And Months", (0x3200, 0x32FF)),),
(("CJK Compatibility", (0x3300, 0x33FF)),),
(("Hangul Syllables", (0xAC00, 0xD7AF)),),
(("Non-Plane 0 *", (0xD800, 0xDFFF)),),
(("Phoenician", (0x10900, 0x1091F)),),
(
("CJK Unified Ideographs", (0x4E00, 0x9FFF)),
("CJK Radicals Supplement", (0x2E80, 0x2EFF)),
("Kangxi Radicals", (0x2F00, 0x2FDF)),
("Ideographic Description Characters", (0x2FF0, 0x2FFF)),
("CJK Unified Ideographs Extension A", (0x3400, 0x4DBF)),
("CJK Unified Ideographs Extension B", (0x20000, 0x2A6DF)),
("Kanbun", (0x3190, 0x319F)),
),
(("Private Use Area (plane 0)", (0xE000, 0xF8FF)),),
(
("CJK Strokes", (0x31C0, 0x31EF)),
("CJK Compatibility Ideographs", (0xF900, 0xFAFF)),
("CJK Compatibility Ideographs Supplement", (0x2F800, 0x2FA1F)),
),
(("Alphabetic Presentation Forms", (0xFB00, 0xFB4F)),),
(("Arabic Presentation Forms-A", (0xFB50, 0xFDFF)),),
(("Combining Half Marks", (0xFE20, 0xFE2F)),),
(
("Vertical Forms", (0xFE10, 0xFE1F)),
("CJK Compatibility Forms", (0xFE30, 0xFE4F)),
),
(("Small Form Variants", (0xFE50, 0xFE6F)),),
(("Arabic Presentation Forms-B", (0xFE70, 0xFEFF)),),
(("Halfwidth And Fullwidth Forms", (0xFF00, 0xFFEF)),),
(("Specials", (0xFFF0, 0xFFFF)),),
(("Tibetan", (0x0F00, 0x0FFF)),),
(("Syriac", (0x0700, 0x074F)),),
(("Thaana", (0x0780, 0x07BF)),),
(("Sinhala", (0x0D80, 0x0DFF)),),
(("Myanmar", (0x1000, 0x109F)),),
(
("Ethiopic", (0x1200, 0x137F)),
("Ethiopic Supplement", (0x1380, 0x139F)),
("Ethiopic Extended", (0x2D80, 0x2DDF)),
),
(("Cherokee", (0x13A0, 0x13FF)),),
(("Unified Canadian Aboriginal Syllabics", (0x1400, 0x167F)),),
(("Ogham", (0x1680, 0x169F)),),
(("Runic", (0x16A0, 0x16FF)),),
(("Khmer", (0x1780, 0x17FF)), ("Khmer Symbols", (0x19E0, 0x19FF))),
(("Mongolian", (0x1800, 0x18AF)),),
(("Braille Patterns", (0x2800, 0x28FF)),),
(("Yi Syllables", (0xA000, 0xA48F)), ("Yi Radicals", (0xA490, 0xA4CF))),
(
("Tagalog", (0x1700, 0x171F)),
("Hanunoo", (0x1720, 0x173F)),
("Buhid", (0x1740, 0x175F)),
("Tagbanwa", (0x1760, 0x177F)),
),
(("Old Italic", (0x10300, 0x1032F)),),
(("Gothic", (0x10330, 0x1034F)),),
(("Deseret", (0x10400, 0x1044F)),),
(
("Byzantine Musical Symbols", (0x1D000, 0x1D0FF)),
("Musical Symbols", (0x1D100, 0x1D1FF)),
("Ancient Greek Musical Notation", (0x1D200, 0x1D24F)),
),
(("Mathematical Alphanumeric Symbols", (0x1D400, 0x1D7FF)),),
(
("Private Use (plane 15)", (0xF0000, 0xFFFFD)),
("Private Use (plane 16)", (0x100000, 0x10FFFD)),
),
(
("Variation Selectors", (0xFE00, 0xFE0F)),
("Variation Selectors Supplement", (0xE0100, 0xE01EF)),
),
(("Tags", (0xE0000, 0xE007F)),),
(("Limbu", (0x1900, 0x194F)),),
(("Tai Le", (0x1950, 0x197F)),),
(("New Tai Lue", (0x1980, 0x19DF)),),
(("Buginese", (0x1A00, 0x1A1F)),),
(("Glagolitic", (0x2C00, 0x2C5F)),),
(("Tifinagh", (0x2D30, 0x2D7F)),),
(("Yijing Hexagram Symbols", (0x4DC0, 0x4DFF)),),
(("Syloti Nagri", (0xA800, 0xA82F)),),
(
("Linear B Syllabary", (0x10000, 0x1007F)),
("Linear B Ideograms", (0x10080, 0x100FF)),
("Aegean Numbers", (0x10100, 0x1013F)),
),
(("Ancient Greek Numbers", (0x10140, 0x1018F)),),
(("Ugaritic", (0x10380, 0x1039F)),),
(("Old Persian", (0x103A0, 0x103DF)),),
(("Shavian", (0x10450, 0x1047F)),),
(("Osmanya", (0x10480, 0x104AF)),),
(("Cypriot Syllabary", (0x10800, 0x1083F)),),
(("Kharoshthi", (0x10A00, 0x10A5F)),),
(("Tai Xuan Jing Symbols", (0x1D300, 0x1D35F)),),
(
("Cuneiform", (0x12000, 0x123FF)),
("Cuneiform Numbers and Punctuation", (0x12400, 0x1247F)),
),
(("Counting Rod Numerals", (0x1D360, 0x1D37F)),),
(("Sundanese", (0x1B80, 0x1BBF)),),
(("Lepcha", (0x1C00, 0x1C4F)),),
(("Ol Chiki", (0x1C50, 0x1C7F)),),
(("Saurashtra", (0xA880, 0xA8DF)),),
(("Kayah Li", (0xA900, 0xA92F)),),
(("Rejang", (0xA930, 0xA95F)),),
(("Cham", (0xAA00, 0xAA5F)),),
(("Ancient Symbols", (0x10190, 0x101CF)),),
(("Phaistos Disc", (0x101D0, 0x101FF)),),
(
("Carian", (0x102A0, 0x102DF)),
("Lycian", (0x10280, 0x1029F)),
("Lydian", (0x10920, 0x1093F)),
),
(("Domino Tiles", (0x1F030, 0x1F09F)), ("Mahjong Tiles", (0x1F000, 0x1F02F))),
)
_unicodeStarts = []
_unicodeValues = [None]
def _getUnicodeRanges():
# build the ranges of codepoints for each unicode range bit, and cache result
if not _unicodeStarts:
unicodeRanges = [
(start, (stop, bit))
for bit, blocks in enumerate(OS2_UNICODE_RANGES)
for _, (start, stop) in blocks
]
for start, (stop, bit) in sorted(unicodeRanges):
_unicodeStarts.append(start)
_unicodeValues.append((stop, bit))
return _unicodeStarts, _unicodeValues
def intersectUnicodeRanges(unicodes, inverse=False):
"""Intersect a sequence of (int) Unicode codepoints with the Unicode block
ranges defined in the OpenType specification v1.7, and return the set of
'ulUnicodeRanges' bits for which there is at least ONE intersection.
If 'inverse' is True, return the the bits for which there is NO intersection.
>>> intersectUnicodeRanges([0x0410]) == {9}
True
>>> intersectUnicodeRanges([0x0410, 0x1F000]) == {9, 57, 122}
True
>>> intersectUnicodeRanges([0x0410, 0x1F000], inverse=True) == (
... set(range(len(OS2_UNICODE_RANGES))) - {9, 57, 122})
True
"""
unicodes = set(unicodes)
unicodestarts, unicodevalues = _getUnicodeRanges()
bits = set()
for code in unicodes:
stop, bit = unicodevalues[bisect.bisect(unicodestarts, code)]
if code <= stop:
bits.add(bit)
# The spec says that bit 57 ("Non Plane 0") implies that there's
# at least one codepoint beyond the BMP; so I also include all
# the non-BMP codepoints here
if any(0x10000 <= code < 0x110000 for code in unicodes):
bits.add(57)
return set(range(len(OS2_UNICODE_RANGES))) - bits if inverse else bits
def calcCodePageRanges(unicodes):
"""Given a set of Unicode codepoints (integers), calculate the
corresponding OS/2 CodePage range bits.
This is a direct translation of FontForge implementation:
https://github.com/fontforge/fontforge/blob/7b2c074/fontforge/tottf.c#L3158
"""
bits = set()
hasAscii = set(range(0x20, 0x7E)).issubset(unicodes)
hasLineart = ord("┤") in unicodes
for uni in unicodes:
if uni == ord("Þ") and hasAscii:
bits.add(0) # Latin 1
elif uni == ord("Ľ") and hasAscii:
bits.add(1) # Latin 2: Eastern Europe
if hasLineart:
bits.add(58) # Latin 2
elif uni == ord("Б"):
bits.add(2) # Cyrillic
if ord("Ѕ") in unicodes and hasLineart:
bits.add(57) # IBM Cyrillic
if ord("╜") in unicodes and hasLineart:
bits.add(49) # MS-DOS Russian
elif uni == ord("Ά"):
bits.add(3) # Greek
if hasLineart and ord("½") in unicodes:
bits.add(48) # IBM Greek
if hasLineart and ord("√") in unicodes:
bits.add(60) # Greek, former 437 G
elif uni == ord("İ") and hasAscii:
bits.add(4) # Turkish
if hasLineart:
bits.add(56) # IBM turkish
elif uni == ord("א"):
bits.add(5) # Hebrew
if hasLineart and ord("√") in unicodes:
bits.add(53) # Hebrew
elif uni == ord("ر"):
bits.add(6) # Arabic
if ord("√") in unicodes:
bits.add(51) # Arabic
if hasLineart:
bits.add(61) # Arabic; ASMO 708
elif uni == ord("ŗ") and hasAscii:
bits.add(7) # Windows Baltic
if hasLineart:
bits.add(59) # MS-DOS Baltic
elif uni == ord("₫") and hasAscii:
bits.add(8) # Vietnamese
elif uni == ord("ๅ"):
bits.add(16) # Thai
elif uni == ord("エ"):
bits.add(17) # JIS/Japan
elif uni == ord("ㄅ"):
bits.add(18) # Chinese: Simplified
elif uni == ord("ㄱ"):
bits.add(19) # Korean wansung
elif uni == ord("央"):
bits.add(20) # Chinese: Traditional
elif uni == ord("곴"):
bits.add(21) # Korean Johab
elif uni == ord("♥") and hasAscii:
bits.add(30) # OEM Character Set
# TODO: Symbol bit has a special meaning (check the spec), we need
# to confirm if this is wanted by default.
# elif chr(0xF000) <= char <= chr(0xF0FF):
# codepageRanges.add(31) # Symbol Character Set
elif uni == ord("þ") and hasAscii and hasLineart:
bits.add(54) # MS-DOS Icelandic
elif uni == ord("╚") and hasAscii:
bits.add(62) # WE/Latin 1
bits.add(63) # US
elif hasAscii and hasLineart and ord("√") in unicodes:
if uni == ord("Å"):
bits.add(50) # MS-DOS Nordic
elif uni == ord("é"):
bits.add(52) # MS-DOS Canadian French
elif uni == ord("õ"):
bits.add(55) # MS-DOS Portuguese
if hasAscii and ord("‰") in unicodes and ord("∑") in unicodes:
bits.add(29) # Macintosh Character Set (US Roman)
return bits
if __name__ == "__main__":
import doctest, sys
sys.exit(doctest.testmod().failed)
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