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      1 from __future__ import print_function, division, absolute_import
      2 from fontTools.misc.py23 import *
      3 from fontTools.misc.textTools import safeEval
      4 from . import DefaultTable
      5 import operator
      6 import struct
      7 
      8 
      9 class table_V_O_R_G_(DefaultTable.DefaultTable):
     10 
     11 	""" This table is structured so that you can treat it like a dictionary keyed by glyph name.
     12 	ttFont['VORG'][<glyphName>] will return the vertical origin for any glyph
     13 	ttFont['VORG'][<glyphName>] = <value> will set the vertical origin for any glyph.
     14 	"""
     15 
     16 	def decompile(self, data, ttFont):
     17 		self.getGlyphName = ttFont.getGlyphName # for use in get/set item functions, for access by GID
     18 		self.majorVersion, self.minorVersion, self.defaultVertOriginY, self.numVertOriginYMetrics = struct.unpack(">HHhH", data[:8])
     19 		assert (self.majorVersion <= 1), "Major version of VORG table is higher than I know how to handle"
     20 		data = data[8:]
     21 		vids = []
     22 		gids = []
     23 		pos = 0
     24 		for i in range(self.numVertOriginYMetrics):
     25 			gid, vOrigin = struct.unpack(">Hh", data[pos:pos+4])
     26 			pos += 4
     27 			gids.append(gid)
     28 			vids.append(vOrigin)
     29 
     30 		self.VOriginRecords = vOrig = {}
     31 		glyphOrder = ttFont.getGlyphOrder()
     32 		try:
     33 			names = map(operator.getitem, [glyphOrder]*self.numVertOriginYMetrics, gids)
     34 		except IndexError:
     35 			getGlyphName = self.getGlyphName
     36 			names = map(getGlyphName, gids )
     37 
     38 		list(map(operator.setitem, [vOrig]*self.numVertOriginYMetrics, names, vids))
     39 
     40 
     41 	def compile(self, ttFont):
     42 		vorgs = list(self.VOriginRecords.values())
     43 		names = list(self.VOriginRecords.keys())
     44 		nameMap = ttFont.getReverseGlyphMap()
     45 		lenRecords = len(vorgs) 
     46 		try:
     47 			gids = map(operator.getitem, [nameMap]*lenRecords, names)
     48 		except KeyError:
     49 			nameMap = ttFont.getReverseGlyphMap(rebuild=True)
     50 			gids = map(operator.getitem, [nameMap]*lenRecords, names)
     51 		vOriginTable = list(zip(gids, vorgs))
     52 		self.numVertOriginYMetrics = lenRecords
     53 		vOriginTable.sort() # must be in ascending GID order
     54 		dataList = [ struct.pack(">Hh", rec[0], rec[1]) for rec in vOriginTable]
     55 		header = struct.pack(">HHhH", self.majorVersion, self.minorVersion, self.defaultVertOriginY, self.numVertOriginYMetrics)
     56 		dataList.insert(0, header)
     57 		data = bytesjoin(dataList)
     58 		return data
     59 
     60 	def toXML(self, writer, ttFont):
     61 		writer.simpletag("majorVersion", value=self.majorVersion)
     62 		writer.newline()
     63 		writer.simpletag("minorVersion", value=self.minorVersion)
     64 		writer.newline()
     65 		writer.simpletag("defaultVertOriginY", value=self.defaultVertOriginY)
     66 		writer.newline()
     67 		writer.simpletag("numVertOriginYMetrics", value=self.numVertOriginYMetrics)
     68 		writer.newline()
     69 		vOriginTable = []
     70 		glyphNames = self.VOriginRecords.keys()
     71 		for glyphName in glyphNames:
     72 			try:
     73 				gid = ttFont.getGlyphID(glyphName)
     74 			except:
     75 				assert 0, "VORG table contains a glyph name not in ttFont.getGlyphNames(): " + str(glyphName)
     76 			vOriginTable.append([gid, glyphName, self.VOriginRecords[glyphName]])
     77 		vOriginTable.sort()
     78 		for entry in vOriginTable:
     79 			vOriginRec = VOriginRecord(entry[1], entry[2])
     80 			vOriginRec.toXML(writer, ttFont)
     81 
     82 	def fromXML(self, name, attrs, content, ttFont):
     83 		if not hasattr(self, "VOriginRecords"):
     84 			self.VOriginRecords = {}
     85 		self.getGlyphName = ttFont.getGlyphName # for use in get/set item functions, for access by GID
     86 		if name == "VOriginRecord":
     87 			vOriginRec = VOriginRecord()
     88 			for element in content:
     89 				if isinstance(element, basestring):
     90 					continue
     91 				name, attrs, content = element
     92 				vOriginRec.fromXML(name, attrs, content, ttFont)
     93 			self.VOriginRecords[vOriginRec.glyphName] = vOriginRec.vOrigin
     94 		elif "value" in attrs:
     95 			setattr(self, name, safeEval(attrs["value"]))
     96 
     97 
     98 	def __getitem__(self, glyphSelector):
     99 		if isinstance(glyphSelector, int):
    100 			# its a gid, convert to glyph name
    101 			glyphSelector = self.getGlyphName(glyphSelector)
    102 
    103 		if glyphSelector not in self.VOriginRecords:
    104 			return self.defaultVertOriginY
    105 			
    106 		return self.VOriginRecords[glyphSelector]
    107 
    108 	def __setitem__(self, glyphSelector, value):
    109 		if isinstance(glyphSelector, int):
    110 			# its a gid, convert to glyph name
    111 			glyphSelector = self.getGlyphName(glyphSelector)
    112 
    113 		if  value != self.defaultVertOriginY:
    114 			self.VOriginRecords[glyphSelector] = value
    115 		elif glyphSelector in self.VOriginRecords:
    116 			del self.VOriginRecords[glyphSelector]
    117 
    118 	def __delitem__(self, glyphSelector):
    119 		del self.VOriginRecords[glyphSelector]
    120 
    121 class VOriginRecord(object):
    122 
    123 	def __init__(self, name = None, vOrigin = None):
    124 		self.glyphName = name
    125 		self.vOrigin = vOrigin
    126 
    127 	def toXML(self, writer, ttFont):
    128 		writer.begintag("VOriginRecord")
    129 		writer.newline()
    130 		writer.simpletag("glyphName", value=self.glyphName)
    131 		writer.newline()
    132 		writer.simpletag("vOrigin", value=self.vOrigin)
    133 		writer.newline()
    134 		writer.endtag("VOriginRecord")
    135 		writer.newline()
    136 
    137 	def fromXML(self, name, attrs, content, ttFont):
    138 		value = attrs["value"]
    139 		if name == "glyphName":
    140 			setattr(self, name, value)
    141 		else:
    142 			setattr(self, name, safeEval(value))
    143