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#!/usr/bin/env python3
__doc__ = '''Merge lookup and feature aliases into TypeTuner feature file'''
__url__ = 'https://github.com/silnrsi/pysilfont'
__copyright__ = 'Copyright (c) 2019 SIL International (https://www.sil.org)'
__license__ = 'Released under the MIT License (https://opensource.org/licenses/MIT)'
__author__ = 'Bob Hallissy'
from silfont.core import execute
from xml.etree import ElementTree as ET
from fontTools import ttLib
import csv
import struct
argspec = [
('input', {'help': 'Input TypeTuner feature file'}, {'type': 'infile'}),
('output', {'help': 'Output TypeTuner feature file'}, {}),
('-m','--mapping', {'help': 'Input csv mapping file'}, {'type': 'incsv'}),
('-f','--ttf', {'help': 'Compiled TTF file'}, {}),
('-l','--log',{'help': 'Optional log file'}, {'type': 'outfile', 'def': '_tuneraliases.log', 'optlog': True}),
]
def doit(args) :
logger = args.logger
if args.mapping is None and args.ttf is None:
logger.log("One or both of -m and -f must be provided", "S")
featdoc = ET.parse(args.input)
root = featdoc.getroot()
if root.tag != 'all_features':
logger.log("Invalid TypeTuner feature file: missing root element", "S")
# Whitespace to add after each new alias:
tail = '\n\t\t'
# Find or add alliaes element
aliases = root.find('aliases')
if aliases is None:
aliases = ET.SubElement(root,'aliases')
aliases.tail = '\n'
added = set()
duplicates = set()
def setalias(name, value):
# detect duplicate names in input
if name in added:
duplicates.add(name)
else:
added.add(name)
# modify existing or add new alias
alias = aliases.find('alias[@name="{}"]'.format(name))
if alias is None:
alias = ET.SubElement(aliases, 'alias', {'name': name, 'value': value})
alias.tail = tail
else:
alias.set('value', value)
# Process mapping file if present:
if args.mapping:
# Mapping file is assumed to come from psfbuildfea, and should look like:
# lookupname,table,index
# e.g. DigitAlternates,GSUB,51
for (name,table,value) in args.mapping:
setalias(name, value)
# Process the ttf file if present
if args.ttf:
# Generate aliases for features.
# In this code featureID means the key used in FontUtils for finding the feature, e.g., "calt _2"
def dotable(t): # Common routine for GPOS and GSUB
currtag = None
currtagindex = None
flist = [] # list, in order, of (featureTag, featureID), per Font::TTF
for i in range(0,t.FeatureList.FeatureCount):
newtag = str(t.FeatureList.FeatureRecord[i].FeatureTag)
if currtag is None or currtag != newtag:
flist.append((newtag, newtag))
currtag = newtag
currtagindex = 0
else:
flist.append( (currtag, '{} _{}'.format(currtag, currtagindex)))
currtagindex += 1
fslList = {} # dictionary keyed by feature_script_lang values returning featureID
for s in t.ScriptList.ScriptRecord:
currtag = str(s.ScriptTag)
# At present only looking at the dflt lang entries
for findex in s.Script.DefaultLangSys.FeatureIndex:
fslList['{}_{}_dflt'.format(flist[findex][0],currtag)] = flist[findex][1]
# Now that we have them all, add them in sorted order.
for name, value in sorted(fslList.items()):
setalias(name,value)
# Open the TTF for processing
try:
f = ttLib.TTFont(args.ttf)
except Exception as e:
logger.log("Couldn't open font '{}' for reading : {}".format(args.ttf, str(e)),"S")
# Grab features from GSUB and GPOS
for tag in ('GSUB', 'GPOS'):
try:
dotable(f[tag].table)
except Exception as e:
logger.log("Failed to process {} table: {}".format(tag, str(e)), "W")
# Grab features from Graphite:
try:
for tag in sorted(f['Feat'].features.keys()):
if tag == '1':
continue
name = 'gr_' + tag
value = str(struct.unpack('>L', tag.encode())[0])
setalias(name,value)
except Exception as e:
logger.log("Failed to process Feat table: {}".format(str(e)), "W")
if len(duplicates):
logger.log("The following aliases defined more than once in input: {}".format(", ".join(sorted(duplicates))), "S")
# Success. Write the result
featdoc.write(args.output, encoding='UTF-8', xml_declaration=True)
def cmd() : execute(None,doit,argspec)
if __name__ == "__main__": cmd()
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