tests: add python parser for hwdb grammar

This works for hwdb/[67]0-*.hwdb. I also added code to parse hwdb/20-*, but those
files are huge, and parsing them using this parser is annoyingly slow (about one
minute for the biggest files). So I removed the support for hwdb/20-*, a much simpler
hand-generated parser should suffice for those.

Current output:

hwdb/60-evdev.hwdb: 24 match groups, 35 matches, 88 properties, 0.19323015213012695s to parse
Match 'evdev:input:b0003v05ACp0259*' is duplicated
Match 'evdev:input:b0003v05ACp025A*' is duplicated
Match 'evdev:input:b0003v05ACp025B*' is duplicated
hwdb/60-keyboard.hwdb: 122 match groups, 188 matches, 638 properties, 1.0906572341918945s to parse
Failed to parse: 'KEYBOARD_KEY_8F=switchvideomode'
Failed to parse: 'KEYBOARD_KEY_C0183=media'
Failed to parse: 'KEYBOARD_KEY_C0201=new'
Failed to parse: 'KEYBOARD_KEY_C0289=reply'
Failed to parse: 'KEYBOARD_KEY_C028B=forwardmail'
Failed to parse: 'KEYBOARD_KEY_C028C=send'
Failed to parse: 'KEYBOARD_KEY_C021A=undo'
Failed to parse: 'KEYBOARD_KEY_C0279=redo'
Failed to parse: 'KEYBOARD_KEY_C0208=print'
Failed to parse: 'KEYBOARD_KEY_C0207=save'
Failed to parse: 'KEYBOARD_KEY_C0194=file'
Failed to parse: 'KEYBOARD_KEY_C01A7=documents'
Failed to parse: 'KEYBOARD_KEY_C01B6=images'
Failed to parse: 'KEYBOARD_KEY_C01B7=sound'
Property KEYBOARD_KEY_c7 is duplicated
Failed to parse: 'KEYBOARD_KEY_cF=end'
hwdb/70-mouse.hwdb: 62 match groups, 93 matches, 68 properties, 0.34186625480651855s to parse
Match 'mouse:usb:v046dpc51b:name:Logitech USB Receiver:' is duplicated
hwdb/70-pointingstick.hwdb: 5 match groups, 14 matches, 7 properties, 0.06518816947937012s to parse
hwdb/70-touchpad.hwdb: 3 match groups, 5 matches, 3 properties, 0.039690494537353516s to parse

Subsequest commits will clean those issues up.

1 files changed, 177 insertions, 0 deletions

diff --git a/hwdb/parse_hwdb.py b/hwdb/parse_hwdb.py
new file mode 100644
index 0000000000..773513eaf0
--- /dev/null
+++ b/hwdb/parse_hwdb.py
@@ -0,0 +1,177 @@
+#  -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
+#
+#  This file is part of systemd.
+#
+#  Copyright 2016 Zbigniew Jędrzejewski-Szmek
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+#  systemd is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public License
+#  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import string
+import functools
+
+try:
+    from pyparsing import (Word, White, Literal, ParserElement, Regex,
+                           LineStart, LineEnd,
+                           ZeroOrMore, OneOrMore, Combine, Or, Optional, Suppress, Group,
+                           nums, alphanums, printables,
+                           stringEnd, pythonStyleComment,
+                           ParseBaseException)
+except ImportError:
+    sys.exit('pyparsing is not available')
+
+try:
+    from evdev.ecodes import ecodes
+except ImportError:
+    ecodes = None
+    print('WARNING: evdev is not available')
+
+EOL = LineEnd().suppress()
+EMPTYLINE = LineStart() + LineEnd()
+COMMENTLINE = pythonStyleComment + EOL
+INTEGER = Word(nums)
+REAL = Combine((INTEGER + Optional('.' + Optional(INTEGER))) ^ ('.' + INTEGER))
+UDEV_TAG = Word(string.ascii_uppercase, alphanums + '_')
+
+TYPES = {'mouse':    ('usb', 'bluetooth', 'ps2', '*'),
+         'evdev':    ('name', 'atkbd', 'input'),
+         'touchpad': ('i8042', 'rmi', 'bluetooth', 'usb'),
+         'keyboard': ('name', ),
+         }
+
+@functools.lru_cache()
+def hwdb_grammar():
+    ParserElement.setDefaultWhitespaceChars('')
+
+    prefix = Or(category + ':' + Or(conn) + ':'
+                for category, conn in TYPES.items())
+    matchline = Combine(prefix + Word(printables + ' ' + '®')) + EOL
+    propertyline = (White(' ', exact=1).suppress() +
+                    Combine(UDEV_TAG - '=' - Word(alphanums + '_=:@*.! ') - Optional(pythonStyleComment)) +
+                    EOL)
+    propertycomment = White(' ', exact=1) + pythonStyleComment + EOL
+
+    group = (OneOrMore(matchline('MATCHES*') ^ COMMENTLINE.suppress()) -
+             OneOrMore(propertyline('PROPERTIES*') ^ propertycomment.suppress()) -
+             (EMPTYLINE ^ stringEnd()).suppress() )
+    commentgroup = OneOrMore(COMMENTLINE).suppress() - EMPTYLINE.suppress()
+
+    grammar = OneOrMore(group('GROUPS*') ^ commentgroup) + stringEnd()
+
+    return grammar
+
+@functools.lru_cache()
+def property_grammar():
+    ParserElement.setDefaultWhitespaceChars(' ')
+
+    setting = Optional('*')('DEFAULT') + INTEGER('DPI') + Suppress('@') + INTEGER('HZ')
+    props = (('MOUSE_DPI', Group(OneOrMore(setting('SETTINGS*')))),
+             ('MOUSE_WHEEL_CLICK_ANGLE', INTEGER),
+             ('ID_INPUT_TRACKBALL', Literal('1')),
+             ('POINTINGSTICK_SENSITIVITY', INTEGER),
+             ('POINTINGSTICK_CONST_ACCEL', REAL),
+             ('ID_INPUT_TOUCHPAD_INTEGRATION', Or(('internal', 'external'))),
+    )
+    fixed_props = [Literal(name)('NAME') - Suppress('=') - val('VALUE')
+                   for name, val in props]
+    kbd_props = [Regex(r'KEYBOARD_KEY_[0-9a-f]+')('NAME')
+                 - Suppress('=') -
+                 ('!' ^ (Optional('!') - Word(alphanums + '_')))('VALUE')
+                 ]
+    abs_props = [Regex(r'EVDEV_ABS_[0-9a-f]{2}')('NAME')
+                 - Suppress('=') -
+                 Word(nums + ':')('VALUE')
+                 ]
+
+    grammar = Or(fixed_props + kbd_props + abs_props)
+
+    return grammar
+
+ERROR = False
+def error(fmt, *args, **kwargs):
+    global ERROR
+    ERROR = True
+    print(fmt.format(*args, **kwargs))
+
+def convert_properties(group):
+    matches = [m[0] for m in group.MATCHES]
+    props = [p[0] for p in group.PROPERTIES]
+    return matches, props
+
+def parse(fname):
+    grammar = hwdb_grammar()
+    try:
+        parsed = grammar.parseFile(fname)
+    except ParseBaseException as e:
+        error('Cannot parse {}: {}', fname, e)
+        return []
+    return [convert_properties(g) for g in parsed.GROUPS]
+
+def check_match_uniqueness(groups):
+    matches = sum((group[0] for group in groups), [])
+    matches.sort()
+    prev = None
+    for match in matches:
+        if match == prev:
+            error('Match {!r} is duplicated', match)
+        prev = match
+
+def check_one_default(prop, settings):
+    defaults = [s for s in settings if s.DEFAULT]
+    if len(defaults) > 1:
+        error('More than one star entry: {!r}', prop)
+
+def check_one_keycode(prop, value):
+    if value != '!' and ecodes is not None:
+        key = 'KEY_' + value.upper()
+        if key not in ecodes:
+            error('Keycode {} unknown', key)
+
+def check_properties(groups):
+    grammar = property_grammar()
+    for matches, props in groups:
+        prop_names = set()
+        for prop in props:
+            # print('--', prop)
+            prop = prop.partition('#')[0].rstrip()
+            try:
+                parsed = grammar.parseString(prop)
+            except ParseBaseException as e:
+                error('Failed to parse: {!r}', prop)
+                continue
+            # print('{!r}'.format(parsed))
+            if parsed.NAME in prop_names:
+                error('Property {} is duplicated', parsed.NAME)
+            prop_names.add(parsed.NAME)
+            if parsed.NAME == 'MOUSE_DPI':
+                check_one_default(prop, parsed.VALUE.SETTINGS)
+            elif parsed.NAME.startswith('KEYBOARD_KEY_'):
+                check_one_keycode(prop, parsed.VALUE)
+
+def print_summary(fname, groups):
+    print('{}: {} match groups, {} matches, {} properties'
+          .format(fname,
+                  len(groups),
+                  sum(len(matches) for matches, props in groups),
+                  sum(len(props) for matches, props in groups),
+          ))
+
+if __name__ == '__main__':
+    for fname in sys.argv[1:]:
+        groups = parse(fname)
+        print_summary(fname, groups)
+        check_match_uniqueness(groups)
+        check_properties(groups)
+
+    sys.exit(ERROR)