mirror of
https://github.com/google/fonts.git
synced 2024-12-13 15:10:22 +03:00
502 lines
15 KiB
Python
502 lines
15 KiB
Python
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import collections
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import contextlib
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import os
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import re
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import sys
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from fontTools import ttLib
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from google.apputils import app
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import gflags as flags
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from util import google_fonts as fonts
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FLAGS = flags.FLAGS
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flags.DEFINE_boolean('suppress_pass', True, 'Whether to print pass: results')
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flags.DEFINE_boolean('check_metadata', True, 'Whether to check METADATA values')
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flags.DEFINE_boolean('check_font', True, 'Whether to check font values')
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flags.DEFINE_string('repair_script', None, 'Where to write a repair script')
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_FIX_TYPE_OPTS = ['all', 'name', 'filename', 'postScriptName', 'fullName',
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'fsSelection', 'fsType', 'usWeightClass', 'emptyGlyphLSB']
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flags.DEFINE_multistring('fix_type', 'all',
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'What types of problems should be fixed by '
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'repair_script. Choices: ' + ', '.join(_FIX_TYPE_OPTS))
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ResultMessageTuple = collections.namedtuple(
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'ResultMessageTuple', ['happy', 'message', 'path', 'repair_script'])
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def _HappyResult(message, path):
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return ResultMessageTuple(True, message, path, None)
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def _SadResult(message, path, repair_script=None):
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return ResultMessageTuple(False, message, path, repair_script)
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def _DropEmptyPathSegments(path):
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"""Removes empty segments from the end of path.
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Args:
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path: A filesystem path.
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Returns:
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path with trailing empty segments removed. Eg /duck/// => /duck.
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"""
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while True:
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(head, tail) = os.path.split(path)
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if tail:
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break
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path = head
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return path
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def _SanityCheck(path):
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"""Runs various sanity checks on the font family under path.
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Args:
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path: A directory containing a METADATA.pb file.
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Returns:
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A list of ResultMessageTuple's.
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"""
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try:
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fonts.Metadata(path)
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except ValueError as e:
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return [_SadResult('Bad METADATA.pb: ' + e.message, path)]
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results = []
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if FLAGS.check_metadata:
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results.extend(_CheckLicense(path))
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results.extend(_CheckNameMatching(path))
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if FLAGS.check_font:
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results.extend(_CheckFontInternalValues(path))
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return results
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def _CheckLicense(path):
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"""Verifies that METADATA.pb license is correct under path.
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Assumes path is of the form .../<license>/<whatever>/METADATA.pb.
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Args:
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path: A directory containing a METADATA.pb file.
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Returns:
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A list with one ResultMessageTuple. If happy, license is good.
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"""
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metadata = fonts.Metadata(path)
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lic = metadata.license
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lic_dir = os.path.basename(os.path.dirname(path))
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# We use /apache for the license Apache2
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if lic_dir == 'apache':
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lic_dir += '2'
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result = _HappyResult('License consistantly %s' % lic, path)
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# if we were Python 3 we'd use casefold(); this will suffice
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if lic_dir.lower() != lic.lower():
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result = _SadResult(
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'Dir license != METADATA license: %s != %s' % (lic_dir, lic), path)
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return [result]
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def _CheckNameMatching(path):
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"""Verifies the various name fields in the METADATA.pb file are sane.
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Args:
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path: A directory containing a METADATA.pb file.
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Returns:
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A list of ResultMessageTuple, one per validation performed.
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"""
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results = []
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metadata = fonts.Metadata(path)
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name = metadata.name
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for font in metadata.fonts:
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# We assume style/weight is correct in METADATA
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style = font.style
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weight = font.weight
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values = [
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('name', name, font.name),
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('filename', fonts.FilenameFor(name, style, weight, '.ttf'),
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font.filename),
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('postScriptName', fonts.FilenameFor(name, style, weight),
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font.post_script_name),
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('fullName', fonts.FullnameFor(name, style, weight), font.full_name)
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]
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for (key, expected, actual) in values:
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if expected != actual:
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results.append(_SadResult(
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'%s METADATA %s/%d %s expected %s, got %s' %
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(name, style, weight, key, expected, actual), path,
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_FixMetadata(style, weight, key, expected)))
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if not results:
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results.append(_HappyResult('METADATA name consistently derived from "%s"'
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% name, path))
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return results
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def _IsItalic(style):
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return style.lower() == 'italic'
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def _IsBold(weight):
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"""Is this weight considered bold?
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Per Dave C, only 700 will be considered bold.
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Args:
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weight: Font weight.
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Returns:
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True if weight is considered bold, otherwise False.
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"""
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return weight == 700
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def _ShouldFix(key):
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return (FLAGS.fix_type and (
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key in FLAGS.fix_type or 'all' in FLAGS.fix_type))
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def _FixMetadata(style, weight, key, expected):
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if not _ShouldFix(key):
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return None
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if not isinstance(expected, int):
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expected = '\'%s\'' % expected
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return ('[f for f in metadata.fonts if f.style == \'%s\' '
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'and f.weight == %d][0].%s = %s') % (
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style, weight, re.sub('([a-z])([A-Z])', r'\1_\2', key)
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.lower(), expected)
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def _FixFsSelectionBit(key, expected):
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"""Write a repair script to fix a bad fsSelection bit.
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Args:
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key: The name of an fsSelection flag, eg 'ITALIC' or 'BOLD'.
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expected: Expected value, true/false, of the flag.
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Returns:
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A python script to fix the problem.
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"""
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if not _ShouldFix('fsSelection'):
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return None
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op = '|='
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verb = 'set'
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mask = bin(fonts.FsSelectionMask(key))
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if not expected:
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op = '&='
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verb = 'unset'
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mask = '~' + mask
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return 'ttf[\'OS/2\'].fsSelection %s %s # %s %s' % (op, mask, verb, key)
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def _FixFsType(expected):
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if not _ShouldFix('fsType'):
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return None
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return 'ttf[\'OS/2\'].fsType = %d' % expected
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def _FixWeightClass(expected):
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if not _ShouldFix('usWeightClass'):
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return None
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return 'ttf[\'OS/2\'].usWeightClass = %d' % expected
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def _FixBadNameRecord(friendly_name, name_id, expected):
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if not _ShouldFix(friendly_name):
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return None
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return ('for nr in [n for n in ttf[\'name\'].names if n.nameID == %d]:\n'
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' nr.string = \'%s\'.encode(nr.getEncoding()) # Fix %s'
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% (name_id, expected, friendly_name))
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def _FixMissingNameRecord(friendly_name, name_id, expected):
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if not _ShouldFix(friendly_name):
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return None
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return ('nr = ttLib.tables._n_a_m_e.NameRecord()\n'
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'nr.nameID = %d # %s'
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'nr.langID = 0x409\n'
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'nr.platEncID = 1\n'
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'nr.platformID = 3\n'
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'nr.string = \'%s\'.encode(nr.getEncoding())\n'
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'ttf[\'name\'].names.append(nr)\n' % (
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name_id, friendly_name, expected))
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def _FixEmptyGlyphLsb(glyph_name):
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if not _ShouldFix('emptyGlyphLSB'):
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return None
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return 'ttf[\'hmtx\'][\'%s\'] = [ttf[\'hmtx\'][\'%s\'][0], 0]\n' % (
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glyph_name, glyph_name)
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def _CheckFontOS2Values(path, font, ttf):
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"""Check sanity of values hidden in the 'OS/2' table.
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Notably usWeightClass, fsType, fsSelection.
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Args:
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path: Path to directory containing font.
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font: A font record from a METADATA.pb.
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ttf: A fontTools.ttLib.TTFont for the font.
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Returns:
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A list of ResultMessageTuple for tests performed.
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"""
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results = []
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font_file = font.filename
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full_font_file = os.path.join(path, font_file)
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expected_style = font.style
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expected_weight = font.weight
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os2 = ttf['OS/2']
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fs_selection_flags = fonts.FsSelectionFlags(os2.fsSelection)
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actual_weight = os2.usWeightClass
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fs_type = os2.fsType
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marked_oblique = 'OBLIQUE' in fs_selection_flags
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marked_italic = 'ITALIC' in fs_selection_flags
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marked_bold = 'BOLD' in fs_selection_flags
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expect_italic = _IsItalic(expected_style)
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expect_bold = _IsBold(expected_weight)
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# Per Dave C, we should NEVER set oblique, use 0 for italic
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expect_oblique = False
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results.append(ResultMessageTuple(
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marked_italic == expect_italic,
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'%s %s/%d fsSelection marked_italic %d' % (
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font_file, expected_style, expected_weight, marked_italic),
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full_font_file, _FixFsSelectionBit('ITALIC', expect_italic)))
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results.append(ResultMessageTuple(
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marked_bold == expect_bold,
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'%s %s/%d fsSelection marked_bold %d' %
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(font_file, expected_style, expected_weight, marked_bold), full_font_file,
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_FixFsSelectionBit('BOLD', expect_bold)))
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results.append(ResultMessageTuple(
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marked_oblique == expect_oblique,
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'%s %s/%d fsSelection marked_oblique %d' % (
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font_file, expected_style, expected_weight, marked_oblique),
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full_font_file, _FixFsSelectionBit('OBLIQUE', expect_oblique)))
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# For weight < 300, just confirm weight [250, 300)
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# TODO(user): we should also verify ordering is correct
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weight_ok = expected_weight == actual_weight
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weight_msg = str(expected_weight)
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if expected_weight < 300:
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weight_ok = actual_weight >= 250 and actual_weight < 300
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weight_msg = '[250, 300)'
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results.append(ResultMessageTuple(
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weight_ok,
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'%s %s/%d weight expected: %s usWeightClass: %d' %
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(font_file, expected_style, expected_weight, weight_msg, actual_weight),
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full_font_file, _FixWeightClass(expected_weight)))
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expected_fs_type = 0
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results.append(ResultMessageTuple(
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expected_fs_type == fs_type,
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'%s %s/%d fsType expected: %d fsType: %d' %
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(font_file, expected_style, expected_weight, expected_fs_type, fs_type),
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full_font_file, _FixFsType(expected_fs_type)))
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return results
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def _CheckFontNameValues(path, name, font, ttf):
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"""Check sanity of values in the 'name' table.
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Specifically the fullname and postScriptName.
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Args:
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path: Path to directory containing font.
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name: The name of the family.
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font: A font record from a METADATA.pb.
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ttf: A fontTools.ttLib.TTFont for the font.
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Returns:
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A list of ResultMessageTuple for tests performed.
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"""
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results = []
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style = font.style
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weight = font.weight
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full_font_file = os.path.join(path, font.filename)
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expectations = [
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('family', fonts.NAME_FAMILY, name),
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('postScriptName', fonts.NAME_PSNAME,
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fonts.FilenameFor(name, style, weight)),
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('fullName', fonts.NAME_FULLNAME, fonts.FullnameFor(name, style, weight))]
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for (friendly_name, name_id, expected) in expectations:
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# If you have lots of name records they should ALL have the right value
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actuals = fonts.ExtractNames(ttf, name_id)
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for (idx, actual) in enumerate(actuals):
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results.append(ResultMessageTuple(
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expected == actual,
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'%s %s/%d \'name\' %s[%d] expected %s, got %s' %
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(name, style, weight, friendly_name, idx, expected, actual),
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full_font_file,
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_FixBadNameRecord(friendly_name, name_id, expected)))
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# should have at least one actual
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if not actuals:
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results.append(_SadResult(
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'%s %s/%d \'name\' %s has NO values' %
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(name, style, weight, friendly_name), full_font_file,
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_FixMissingNameRecord(friendly_name, name_id, expected)))
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return results
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def _CheckLSB0ForEmptyGlyphs(path, font, ttf):
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"""Checks if font has empty (loca[n] == loca[n+1]) glyphs that have non-0 lsb.
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There is no reason to set such lsb's.
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Args:
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path: Path to directory containing font.
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font: A font record from a METADATA.pb.
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ttf: A fontTools.ttLib.TTFont for the font.
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Returns:
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A list of ResultMessageTuple for tests performed.
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"""
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results = []
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if 'loca' not in ttf:
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return results
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for glyph_index, glyph_name in enumerate(ttf.getGlyphOrder()):
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is_empty = ttf['loca'][glyph_index] == ttf['loca'][glyph_index + 1]
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lsb = ttf['hmtx'][glyph_name][1]
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if is_empty and lsb != 0:
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results.append(_SadResult(
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'%s %s/%d [\'hmtx\'][\'%s\'][1] (lsb) should be 0 but is %d' %
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(font.name, font.style, font.weight, glyph_name, lsb),
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os.path.join(path, font.filename), _FixEmptyGlyphLsb(glyph_name)))
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return results
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def _CheckFontInternalValues(path):
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"""Validates fonts internal metadata matches METADATA.pb values.
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In particular, checks 'OS/2' {usWeightClass, fsSelection, fsType} and 'name'
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{fullName, postScriptName} values.
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Args:
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path: A directory containing a METADATA.pb file.
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Returns:
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A list of ResultMessageTuple, one per validation performed.
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"""
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results = []
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metadata = fonts.Metadata(path)
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name = metadata.name
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for font in metadata.fonts:
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font_file = font.filename
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with contextlib.closing(ttLib.TTFont(os.path.join(path, font_file))) as ttf:
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results.extend(_CheckFontOS2Values(path, font, ttf))
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results.extend(_CheckFontNameValues(path, name, font, ttf))
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results.extend(_CheckLSB0ForEmptyGlyphs(path, font, ttf))
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return results
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def _WriteRepairScript(dest_file, results):
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with open(dest_file, 'w') as out:
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out.write('import collections\n')
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out.write('import contextlib\n')
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out.write('from fontTools import ttLib\n')
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out.write('from google.protobuf.text_format import text_format\n')
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out.write('from fonts_public_pb2 import fonts_pb2\n')
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out.write('from fonts_public_pb2 '
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'import fonts_metadata_pb2\n')
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out.write('\n')
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# group by path
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by_path = collections.defaultdict(list)
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for result in results:
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if result.happy or not result.repair_script:
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continue
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if result.repair_script not in by_path[result.path]:
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by_path[result.path].append(result.repair_script)
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for path in sorted(by_path.keys()):
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out.write('# repair %s\n' % os.path.basename(path))
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_, ext = os.path.splitext(path)
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prefix = ''
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if ext == '.ttf':
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prefix = ' '
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out.write('with contextlib.closing(ttLib.TTFont(\'%s\')) as ttf:\n'
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% path)
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elif os.path.isdir(path):
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metadata_file = os.path.join(path, 'METADATA.pb')
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out.write('metadata = fonts_pb2.FamilyProto()\n')
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out.write('with open(\'%s\', \'r\') as f:\n' % metadata_file)
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out.write(' text_format.Merge(f.read(), metadata)\n')
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else:
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raise ValueError('Not sure how to script %s' % path)
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for repair in by_path[path]:
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out.write(prefix)
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out.write(re.sub('\n', '\n' + prefix, repair))
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out.write('\n')
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if ext == '.ttf':
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out.write(' ttf.save(\'%s\')\n' % path)
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if os.path.isdir(path):
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out.write('with open(\'%s\', \'w\') as f:\n' % metadata_file)
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out.write(' f.write(text_format.MessageToString(metadata))\n')
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out.write('\n')
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def main(argv):
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result_code = 0
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all_results = []
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paths = [_DropEmptyPathSegments(os.path.expanduser(p)) for p in argv[1:]]
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for path in paths:
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if not os.path.isdir(path):
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raise ValueError('Not a directory: %s' % path)
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for path in paths:
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for font_dir in fonts.FontDirs(path):
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results = _SanityCheck(font_dir)
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all_results.extend(results)
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for result in results:
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result_msg = 'pass'
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if not result.happy:
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result_code = 1
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result_msg = 'FAIL'
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if not result.happy or not FLAGS.suppress_pass:
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print '%s: %s (%s)' % (result_msg, result.message, font_dir)
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if FLAGS.repair_script:
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_WriteRepairScript(FLAGS.repair_script, all_results)
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sys.exit(result_code)
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if __name__ == '__main__':
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app.run()
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