# Source code for fontTools.ttLib.tables._p_o_s_t

    from fontTools import ttLib
    from fontTools.ttLib.standardGlyphOrder import standardGlyphOrder
    from fontTools.misc import sstruct
    from fontTools.misc.textTools import bytechr, byteord, tobytes, tostr, safeEval, readHex
    from . import DefaultTable
    import sys
    import struct
    import array
    import logging

    log = logging.getLogger(__name__)

    postFormat = """
    	>
    	formatType:			16.16F
    	italicAngle:		16.16F		# italic angle in degrees
    	underlinePosition:	h
    	underlineThickness:	h
    	isFixedPitch:		L
    	minMemType42:		L			# minimum memory if TrueType font is downloaded
    	maxMemType42:		L			# maximum memory if TrueType font is downloaded
    	minMemType1:		L			# minimum memory if Type1 font is downloaded
    	maxMemType1:		L			# maximum memory if Type1 font is downloaded
    """

    postFormatSize = sstruct.calcsize(postFormat)

    class table__p_o_s_t(DefaultTable.DefaultTable):
        """PostScript table

        The ``post`` table contains information needed to use the font on
        PostScript printers, including the PostScript names of glyphs and
        data that was stored in the ``FontInfo`` dictionary for Type 1 fonts.

        See also https://learn.microsoft.com/en-us/typography/opentype/spec/post
        """

        def decompile(self, data, ttFont):
            sstruct.unpack(postFormat, data[:postFormatSize], self)
            data = data[postFormatSize:]
            if self.formatType == 1.0:
                self.decode_format_1_0(data, ttFont)
            elif self.formatType == 2.0:
                self.decode_format_2_0(data, ttFont)
            elif self.formatType == 3.0:
                self.decode_format_3_0(data, ttFont)
            elif self.formatType == 4.0:
                self.decode_format_4_0(data, ttFont)
            else:
                # supported format
                raise ttLib.TTLibError(
                    "'post' table format %f not supported" % self.formatType
                )

        def compile(self, ttFont):
            data = sstruct.pack(postFormat, self)
            if self.formatType == 1.0:
                pass  # we're done
            elif self.formatType == 2.0:
                data = data + self.encode_format_2_0(ttFont)
            elif self.formatType == 3.0:
                pass  # we're done
            elif self.formatType == 4.0:
                data = data + self.encode_format_4_0(ttFont)
            else:
                # supported format
                raise ttLib.TTLibError(
                    "'post' table format %f not supported" % self.formatType
                )
            return data

        def getGlyphOrder(self):
            """This function will get called by a ttLib.TTFont instance.
            Do not call this function yourself, use TTFont().getGlyphOrder()
            or its relatives instead!
            """
            if not hasattr(self, "glyphOrder"):
                raise ttLib.TTLibError("illegal use of getGlyphOrder()")
            glyphOrder = self.glyphOrder
            del self.glyphOrder
            return glyphOrder

        def decode_format_1_0(self, data, ttFont):
            self.glyphOrder = standardGlyphOrder[: ttFont["maxp"].numGlyphs]

        def decode_format_2_0(self, data, ttFont):
            (numGlyphs,) = struct.unpack(">H", data[:2])
            numGlyphs = int(numGlyphs)
            if numGlyphs > ttFont["maxp"].numGlyphs:
                # Assume the numGlyphs field is bogus, so sync with maxp.
                # I've seen this in one font, and if the assumption is
                # wrong elsewhere, well, so be it: it's hard enough to
                # work around _one_ non-conforming post format...
                numGlyphs = ttFont["maxp"].numGlyphs
            data = data[2:]
            indices = array.array("H")
            indices.frombytes(data[: 2 * numGlyphs])
            if sys.byteorder != "big":
                indices.byteswap()
            data = data[2 * numGlyphs :]
            maxIndex = max(indices)
            self.extraNames = extraNames = unpackPStrings(data, maxIndex - 257)
            self.glyphOrder = glyphOrder = [""] * int(ttFont["maxp"].numGlyphs)
            for glyphID in range(numGlyphs):
                index = indices[glyphID]
                if index > 257:
                    try:
                        name = extraNames[index - 258]
                    except IndexError:
                        name = ""
                else:
                    # fetch names from standard list
                    name = standardGlyphOrder[index]
                glyphOrder[glyphID] = name
            self.build_psNameMapping(ttFont)

        def build_psNameMapping(self, ttFont):
            mapping = {}
            allNames = {}
            glyphOrderNames = set(self.glyphOrder)
            for i in range(ttFont["maxp"].numGlyphs):
                glyphName = psName = self.glyphOrder[i]
                if glyphName == "":
                    glyphName = "glyph%.5d" % i

                if glyphName in allNames:
                    # make up a new glyphName that's unique
                    n = allNames[glyphName]
                    # check if the glyph name exists in the glyph order
                    while f"{glyphName}.{n}" in glyphOrderNames:
                        n += 1
                    allNames[glyphName] = n + 1
                    glyphName = f"{glyphName}.{n}"

                allNames[glyphName] = 1
                if glyphName != psName:
                    self.glyphOrder[i] = glyphName
                    mapping[glyphName] = psName

            self.mapping = mapping

        def decode_format_3_0(self, data, ttFont):
            # Setting self.glyphOrder to None will cause the TTFont object
            # try and construct glyph names from a Unicode cmap table.
            self.glyphOrder = None

        def decode_format_4_0(self, data, ttFont):
            from fontTools import agl

            numGlyphs = ttFont["maxp"].numGlyphs
            indices = array.array("H")
            indices.frombytes(data)
            if sys.byteorder != "big":
                indices.byteswap()
            # In some older fonts, the size of the post table doesn't match
            # the number of glyphs. Sometimes it's bigger, sometimes smaller.
            self.glyphOrder = glyphOrder = [""] * int(numGlyphs)
            for i in range(min(len(indices), numGlyphs)):
                if indices[i] == 0xFFFF:
                    self.glyphOrder[i] = ""
                elif indices[i] in agl.UV2AGL:
                    self.glyphOrder[i] = agl.UV2AGL[indices[i]]
                else:
                    self.glyphOrder[i] = "uni%04X" % indices[i]
            self.build_psNameMapping(ttFont)

        def encode_format_2_0(self, ttFont):
            numGlyphs = ttFont["maxp"].numGlyphs
            glyphOrder = ttFont.getGlyphOrder()
            assert len(glyphOrder) == numGlyphs
            indices = array.array("H")
            extraDict = {}
            extraNames = self.extraNames = [
                n for n in self.extraNames if n not in standardGlyphOrder
            ]
            for i, name in enumerate(extraNames):
                extraDict[name] = i
            for glyphName in glyphOrder:
                if glyphName in self.mapping:
                    psName = self.mapping[glyphName]
                else:
                    psName = glyphName
                if psName in extraDict:
                    index = 258 + extraDict[psName]
                elif psName in standardGlyphOrder:
                    index = standardGlyphOrder.index(psName)
                else:
                    index = 258 + len(extraNames)
                    extraDict[psName] = len(extraNames)
                    extraNames.append(psName)
                indices.append(index)
            if sys.byteorder != "big":
                indices.byteswap()
            return (
                struct.pack(">H", numGlyphs) + indices.tobytes() + packPStrings(extraNames)
            )

        def encode_format_4_0(self, ttFont):
            from fontTools import agl

            numGlyphs = ttFont["maxp"].numGlyphs
            glyphOrder = ttFont.getGlyphOrder()
            assert len(glyphOrder) == numGlyphs
            indices = array.array("H")
            for glyphID in glyphOrder:
                glyphID = glyphID.split("#")[0]
                if glyphID in agl.AGL2UV:
                    indices.append(agl.AGL2UV[glyphID])
                elif len(glyphID) == 7 and glyphID[:3] == "uni":
                    indices.append(int(glyphID[3:], 16))
                else:
                    indices.append(0xFFFF)
            if sys.byteorder != "big":
                indices.byteswap()
            return indices.tobytes()

        def toXML(self, writer, ttFont):
            formatstring, names, fixes = sstruct.getformat(postFormat)
            for name in names:
                value = getattr(self, name)
                writer.simpletag(name, value=value)
                writer.newline()
            if hasattr(self, "mapping"):
                writer.begintag("psNames")
                writer.newline()
                writer.comment(
                    "This file uses unique glyph names based on the information\n"
                    "found in the 'post' table. Since these names might not be unique,\n"
                    "we have to invent artificial names in case of clashes. In order to\n"
                    "be able to retain the original information, we need a name to\n"
                    "ps name mapping for those cases where they differ. That's what\n"
                    "you see below.\n"
                )
                writer.newline()
                items = sorted(self.mapping.items())
                for name, psName in items:
                    writer.simpletag("psName", name=name, psName=psName)
                    writer.newline()
                writer.endtag("psNames")
                writer.newline()
            if hasattr(self, "extraNames"):
                writer.begintag("extraNames")
                writer.newline()
                writer.comment(
                    "following are the name that are not taken from the standard Mac glyph order"
                )
                writer.newline()
                for name in self.extraNames:
                    writer.simpletag("psName", name=name)
                    writer.newline()
                writer.endtag("extraNames")
                writer.newline()
            if hasattr(self, "data"):
                writer.begintag("hexdata")
                writer.newline()
                writer.dumphex(self.data)
                writer.endtag("hexdata")
                writer.newline()

        def fromXML(self, name, attrs, content, ttFont):
            if name not in ("psNames", "extraNames", "hexdata"):
                setattr(self, name, safeEval(attrs["value"]))
            elif name == "psNames":
                self.mapping = {}
                for element in content:
                    if not isinstance(element, tuple):
                        continue
                    name, attrs, content = element
                    if name == "psName":
                        self.mapping[attrs["name"]] = attrs["psName"]
            elif name == "extraNames":
                self.extraNames = []
                for element in content:
                    if not isinstance(element, tuple):
                        continue
                    name, attrs, content = element
                    if name == "psName":
                        self.extraNames.append(attrs["name"])
            else:
                self.data = readHex(content)

    def unpackPStrings(data, n):
        # extract n Pascal strings from data.
        # if there is not enough data, use ""

        strings = []
        index = 0
        dataLen = len(data)

        for _ in range(n):
            if dataLen <= index:
                length = 0
            else:
                length = byteord(data[index])
            index += 1

            if dataLen <= index + length - 1:
                name = ""
            else:
                name = tostr(data[index : index + length], encoding="latin1")
            strings.append(name)
            index += length

        if index < dataLen:
            log.warning("%d extra bytes in post.stringData array", dataLen - index)

        elif dataLen < index:
            log.warning("not enough data in post.stringData array")

        return strings

    def packPStrings(strings):
        data = b""
        for s in strings:
            data = data + bytechr(len(s)) + tobytes(s, encoding="latin1")
        return data