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#!/usr/bin/env python
## Copyright (C) 2001-2023 Artifex Software, Inc.
# All Rights Reserved.
#
# This software is provided AS-IS with no warranty, either express or
# implied.
#
# This software is distributed under license and may not be copied,
# modified or distributed except as expressly authorized under the terms
# of the license contained in the file LICENSE in this distribution.
#
# Refer to licensing information at http://www.artifex.com or contact
# Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
# CA 94129, USA, for further information.
#
# script to analyse differences in Adobe Font Metrics files
import string
class fontmetric:
"""A container for a parsed font metric file"""
def __init__(self, filename):
self.filename = filename
self.mode = [''] # this is a stack that keeps track of the parsing context
self.info = {} # global font info
self.metrics = {} # glyph metrics, index by postscript character name
self.kerning = {} # kerning data
def parse(self):
print
print "loading metric data from '"+self.filename+"'"
self.file = open(self.filename, 'r')
line = self.file.readline()
while line != '':
self.parseline(string.strip(line))
line = self.file.readline()
self.file.close()
def parseline(self, line):
# skip blank lines
if len(line) == 0: return
#print " parsing '"+line+"'"
bits = string.split(line)
key = bits[0]
# handle context changes
if key[:5] == 'Start':
self.mode.append(key[5:])
print " parsing " + self.mode[-1]
return
if key[:3] == 'End':
self.mode.pop()
return
# parse inside the current context
if self.mode[-1] == 'FontMetrics':
# some keys we treat specially
if key == 'FontBBox':
value = [ bits[1], bits[2], bits[3], bits[4] ]
elif key == 'VVector' or key == 'CharWidth':
value = [ bits[1], bits[2] ]
# all are a string or a single value we treat as such
else:
value = string.join(bits[1:])
#print " "+key+": "+str(value)
self.info[key] = value
elif self.mode[-1] == 'CharMetrics':
if key != 'C' and key != 'CX':
print "error: non metric data!"
return
# each line is a dictionary
dict = {}
for element in string.split(line, ';'):
bits = string.split(element)
if len(bits) > 0:
if bits[0] == 'B':
value = [ int(bits[1]), int(bits[2]), int(bits[3]), int(bits[4]) ]
else:
value = string.join(bits[1:])
dict[bits[0]] = value
self.metrics[dict['N']] = dict
del dict
def print_info(self):
keys = self.info.keys()
keys.sort()
for key in keys:
print " " + string.ljust(key, 18) + " " + str(self.info[key])
def print_metrics(self):
keys = self.metrics.keys()
keys.sort()
for glyph in keys:
width = self.metrics[glyph]['WX']
bbox = self.metrics[glyph]['B']
print " " + string.rjust(glyph, 12),
print " " + string.rjust(width, 5),
print " %4d %4d %4d %4d" % (bbox[0],bbox[1],bbox[2],bbox[3])
def dump(file):
afm = fontmetric(file)
afm.parse()
print "Font Information for " + afm.info['FullName'] + " (" + afm.filename + ")"
afm.print_info()
print "Font Metrics [width] [bbox]"
afm.print_metrics()
def diff(a,b):
one = fontmetric(a)
one.parse();
two = fontmetric(b)
two.parse()
print "differences between '"+a+"' and '"+b+"':"
#print " [not yet implemented. try --dump on each file and then running 'diff']"
# break abstraction
glyphs = one.metrics.keys()
glyphs.sort()
count = 0
for glyph in glyphs:
awx = one.metrics[glyph]['WX']
try:
bwx = two.metrics[glyph]['WX']
except KeyError:
continue
if awx != bwx:
count += 1
print " ", glyph, awx, bwx
print count, "advance width differences"
import sys, getopt
def usage():
print "Usage: " + sys.argv[0] + " [options] <file1.afm> [<file2.afm>]"
print "reads adobe font metric files an preforms various tasks"
print " options:"
print " --dump prints the parsed data for manual comparison"
print " --diff prints a summary of the differences between two afm files"
print " --help this summary"
print
def main():
try:
opts, args = getopt.getopt(sys.argv[1:], "hdxv", ['help', 'dump', 'diff', 'version'])
except getopt.GetoptError:
usage()
sys.exit(2)
for opt, arg in opts:
if opt in ('-h', '--help'):
usage();
sys.exit();
elif opt in ('-d', '--dump'):
if len(args) > 0:
for file in args: dump(file);
else:
print " --dump requires at least one file as an argument"
sys.exit(2)
elif opt in ('-x', '--diff'):
if len(args) == 2:
diff(args[0], args[1])
else:
print " --diff requires two files as arguments"
sys.exit(2)
# call ourselves if we're a script
if __name__ == "__main__":
main()
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