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#! /usr/bin/env python

"""

Adds an SVG table to a TTF or OTF font.

The file names of the SVG glyphs need to match their corresponding glyph final names.

"""

import os

import sys

import re

from distutils.version import StrictVersion

try:

from fontTools import ttLib, version

from fontTools.ttLib.tables import S_V_G_

except ImportError:

print >> sys.stderr, "ERROR: FontTools Python module is not installed."

sys.exit(1)

# support for the SVG table was added to FontTools on Aug 28, 2013

# https://github.com/behdad/fonttools/commit/ddcca79308b52dc36b24ef94cab4ab00c8e32376

minFontToolsVersion = '2.5'

if StrictVersion(version) < StrictVersion(minFontToolsVersion):

print >> sys.stderr, "ERROR: The FontTools module version must be %s or higher.\n\

You have version %s installed.\n\

Get the latest version at https://github.com/behdad/fonttools" % (minFontToolsVersion, version)

sys.exit(1)

# Regexp patterns

reXMLheader = re.compile(r"<\?xml.+?\?>")

reSVGelement = re.compile(r"<svg.+?>.+?</svg>", re.DOTALL)

reIDvalue = re.compile(r"<svg[^>]+?(id=\".*?\").+?>", re.DOTALL)

reViewBox = re.compile(r"<svg.+?(viewBox=[\"|\'][\d, ]+[\"|\']).+?>", re.DOTALL)

def readFile(filePath):

f = open(filePath, "rt")

data = f.read()

f.close()

return data

def setIDvalue(data, gid):

id = reIDvalue.search(data)

if id:

newData = re.sub(id.group(1), 'id="glyph%s"' % gid, data)

else:

newData = re.sub('<svg', '<svg id="glyph%s"' % gid, data)

return newData

def fixViewBox(data):

viewBox = reViewBox.search(data)

if not viewBox:

return data

fixedViewBox = 'viewBox=\"0 1000 1000 1000\"'

fixedData = re.sub(viewBox.group(1), fixedViewBox, data)

return fixedData

def getGlyphNameFromFileName(filePath):

folderPath, fontFileName = os.path.split(filePath)

fileNameNoExtension, fileExtension = os.path.splitext(fontFileName)

return fileNameNoExtension

def processFontFile(fontFilePath, svgFilePathsList):

# retrieve the font's glyph order, to determine the GID later

font = ttLib.TTFont(fontFilePath)

glyphOrder = font.getGlyphOrder()

# first create a dictionary because the SVG glyphs need to be sorted in the table

svgDocsDict = {}

for svgFilePath in svgFilePathsList:

gName = getGlyphNameFromFileName(svgFilePath)

try:

gid = glyphOrder.index(gName)

except ValueError:

print >> sys.stderr, "ERROR: Could not find a glyph named %s in the font %s." % (gName, os.path.split(fontFilePath)[1])

continue

svgItemsList = []

svgItemData = readFile(svgFilePath)

svgItemData = setIDvalue(svgItemData, gid)

svgItemData = fixViewBox(svgItemData)

svgItemsList.append(svgItemData)

svgItemsList.extend([gid, gid])

svgDocsDict[gid] = svgItemsList

# don't do any changes to the source OTF/TTF font if there's no SVG data

if not svgDocsDict:

return

svgDocsList = [svgDocsDict[index] for index in sorted(svgDocsDict.keys())]

svgTable = S_V_G_.table_S_V_G_()

svgTable.docList = svgDocsList

svgTable.colorPalettes = None

font['SVG '] = svgTable

# FontTools can't overwrite a font on save,

# so save to a hidden file, and then rename it

# https://github.com/behdad/fonttools/issues/302

folderPath, fontFileName = os.path.split(fontFilePath)

fileNameNoExtension, fileExtension = os.path.splitext(fontFileName)

newFontFilePath = os.path.join(folderPath, "%s%s%s" % ('.', fileNameNoExtension, fileExtension))

font.save(newFontFilePath)

font.close()

# On windows file can't be renamed to file what already exist.

os.remove(fontFilePath)

os.rename(newFontFilePath, fontFilePath)

print >> sys.stdout, "\nSVG table successfully added to %s" % fontFilePath

def validateSVGfiles(svgFilePathsList):

"""

Light validation of SVG files.

Checks that:

- there is an <xml> header

- there is an <svg> element

"""

validatedPaths = []

for filePath in svgFilePathsList:

# skip hidden files (filenames that start with period)

fileName = os.path.basename(filePath)

if fileName[0] == '.':

continue

# read file

data = readFile(filePath)

# find <xml> header

xml = reXMLheader.search(data)

if not xml:

print "WARNING: Could not find <xml> header in the file. Skiping %s" % (filePath)

continue

# find <svg> blob

svg = reSVGelement.search(data)

if not svg:

print "WARNING: Could not find <svg> element in the file. Skiping %s" % (filePath)

continue

validatedPaths.append(filePath)

return validatedPaths

def getFontFormat(fontFilePath):

# these lines were scavenged from fontTools

f = open(fontFilePath, "rb")

header = f.read(256)

head = header[:4]

if head == "OTTO":

return "OTF"

elif head in ("\0\1\0\0", "true"):

return "TTF"

return None

def run():

fontFilePath = os.path.realpath(sys.argv[1])

svgFolderPath = os.path.realpath(sys.argv[2])

# Font file path

if os.path.isfile(fontFilePath):

if getFontFormat(fontFilePath) not in ["OTF", "TTF"]:

print >> sys.stderr, "ERROR: The path is not a valid OTF or TTF font."

return

else:

print >> sys.stderr, "ERROR: The path to the font is invalid."

return

# SVG folder path

if os.path.isdir(svgFolderPath):

svgFilePathsList = []

for dirName, subdirList, fileList in os.walk(svgFolderPath): # Support nested folders

for file in fileList:

svgFilePathsList.append(os.path.join(dirName, file)) # Assemble the full paths, not just file names

else:

print >> sys.stderr, "ERROR: The path to the folder containing the SVG files is invalid."

return

# validate the SVGs

svgFilePathsList = validateSVGfiles(svgFilePathsList)

if not svgFilePathsList:

print >> sys.stderr, "WARNING: No SVG files were found."

return

processFontFile(fontFilePath, svgFilePathsList)

if __name__ == "__main__":

if len(sys.argv) != 3:

print "To run this script type:\n python %s <path to input OTF/TTF file> <path to folder tree containing SVG files>" % sys.argv[0]

else:

run()