679 lines
21 KiB
Python
679 lines
21 KiB
Python
##
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# This software was developed and / or modified by Raytheon Company,
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# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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#
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# U.S. EXPORT CONTROLLED TECHNICAL DATA
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# This software product contains export-restricted data whose
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# export/transfer/disclosure is restricted by U.S. law. Dissemination
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# to non-U.S. persons whether in the United States or abroad requires
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# an export license or other authorization.
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#
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# Contractor Name: Raytheon Company
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# Contractor Address: 6825 Pine Street, Suite 340
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# Mail Stop B8
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# Omaha, NE 68106
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# 402.291.0100
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#
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# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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# further licensing information.
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##
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#
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# Name:
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# MetarDecoder.py
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# GFS1-NHD:A7806.0000-SCRIPT;1.25
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#
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# Status:
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# DELIVERED
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#
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# History:
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# Revision 1.25 (DELIVERED)
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# Created: 01-AUG-2008 15:44:46 OBERFIEL
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# Synch'd up with changes in OB8.3.1
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#
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# Revision 1.24 (DELIVERED)
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# Created: 19-JUN-2008 14:28:30 OBERFIEL
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# Fixed problem with visibility when given in meters
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#
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# Revision 1.23 (DELIVERED)
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# Created: 22-JUN-2007 12:42:57 OBERFIEL
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# Removed superflous __index method and used tpg information
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# to determine location of token in index method.
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#
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# Revision 1.22 (DELIVERED)
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# Created: 20-JUN-2007 08:56:55 OBERFIEL
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# Updates to take care of PIT DRs
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#
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# Revision 1.21 (DELIVERED)
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# Created: 25-MAY-2007 14:27:10 OBERFIEL
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# Update to support additional information in remarks
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#
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# Revision 1.20 (REVIEW)
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# Created: 15-MAY-2007 14:19:17 OBERFIEL
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# Added ability to find and decode SFC VIS in RMK section of
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# METAR.
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#
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# Revision 1.19 (DELIVERED)
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# Created: 14-APR-2006 13:17:48 TROJAN
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# spr 7118
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#
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# Revision 1.18 (DELIVERED)
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# Created: 14-APR-2006 08:24:41 TROJAN
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# spr 7117
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#
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# Revision 1.17 (DELIVERED)
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# Created: 03-NOV-2005 13:16:32 TROJAN
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# spr 7051
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#
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# Revision 1.16 (APPROVED)
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# Created: 12-OCT-2005 18:26:35 TROJAN
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# spr 7040
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#
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# Revision 1.15 (DELIVERED)
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# Created: 07-JUL-2005 12:57:10 TROJAN
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# spr 6879
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#
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# Revision 1.14 (DELIVERED)
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# Created: 13-MAY-2005 18:58:15 TROJAN
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# spr 6841
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#
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# Revision 1.13 (REVIEW)
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# Created: 07-MAY-2005 11:35:32 OBERFIEL
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# Added Item Header Block
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#
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# Revision 1.12 (DELIVERED)
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# Created: 18-APR-2005 17:32:08 OBERFIEL
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# Changes to support gamin
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#
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# Revision 1.11 (DELIVERED)
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# Created: 04-APR-2005 15:51:07 TROJAN
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# spr 6775
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#
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# Revision 1.10 (APPROVED)
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# Created: 21-MAR-2005 14:02:06 TROJAN
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# spr 6734
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#
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# Revision 1.9 (DELIVERED)
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# Created: 02-MAR-2005 14:38:31 TROJAN
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# spr 6691
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#
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# Revision 1.8 (DELIVERED)
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# Created: 14-FEB-2005 21:08:13 TROJAN
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# spr 6651
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#
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# Revision 1.7 (APPROVED)
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# Created: 24-JAN-2005 17:49:55 TROJAN
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# spr 6608
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#
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# Revision 1.6 (APPROVED)
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# Created: 19-JAN-2005 15:17:43 TROJAN
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# spr 6565
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#
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# Revision 1.5 (APPROVED)
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# Created: 01-OCT-2004 13:34:49 TROJAN
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# spr 6398
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#
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# Revision 1.4 (APPROVED)
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# Created: 19-AUG-2004 20:49:15 OBERFIEL
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# Code chage
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#
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# Revision 1.3 (REVIEW)
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# Created: 09-JUL-2004 19:48:12 OBERFIEL
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# Fixed problem with VCTS and temperature decoding
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#
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# Revision 1.2 (UNDER WORK)
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# Created: 09-JUL-2004 19:42:15 OBERFIEL
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# Fixed problem with VCTS and temperature decoding
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#
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# Revision 1.1 (APPROVED)
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# Created: 01-JUL-2004 14:41:54 OBERFIEL
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# date and time created -2147483647/-2147483648/-2147481748
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# -2147483648:-2147483648:-2147483648 by oberfiel
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#
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# Change Document History:
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# 1:
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# Change Document: GFS1-NHD_SPR_7385
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# Action Date: 11-OCT-2008 12:56:11
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# Relationship Type: In Response to
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# Status: CLOSED
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# Title: AvnFPS: Handle missing LLWS sources better
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#
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#
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##
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# This is a base file that is not intended to be overridden.
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##
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#
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# SOFTWARE HISTORY
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#
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# Date Ticket# Engineer Description
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# ------------ ---------- ----------- --------------------------
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# 01/16/2018 6965 tgurney Fix regex for vsby in meters
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# 03/05/2018 7017 njensen Fix valid_day() to handle leap days
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#
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import time
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import tpg
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import Avn
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IN_TO_MB = 33.8622
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M_TO_SM = 1.0/1609.0
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MPS_TO_KT = 3600.0/1852.0
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_ValidVcnty = dict.fromkeys(['TS', 'SH', 'FG'])
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###############################################################################
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# local exceptions
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class Error(Exception):
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pass
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##############################################################################
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# parser stuff
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_SkyCov = 'FEW|SCT|BKN|OVC'
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_Cld = '(%s)\d{3}(CB|TCU)?' % _SkyCov
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_Fract = '([1-4] |[1-4])?[1357]/([248]|16)'
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_Obv = 'BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|[+]?FC|SS|DS|SN'
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_ObvQ = 'MI|PR|BC|DR|BL|FZ'
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_Pcp = 'DZ|RA|SN|SG|IC|PE|GR|GS|UP|PL'
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_PcpQ = 'SH|TS|FZ'
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_Options = r"""
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set lexer = ContextSensitiveLexer
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set lexer_dotall = True
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"""
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_Separator = r"separator spaces: '\s+' ;"
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_pcptok = '[+-]?(%s)?(%s)+' % (_PcpQ, _Pcp)
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_obvtok = '(%s)?(%s)' % (_ObvQ, _Obv)
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_vsbytok = '(?P<%s>\d{1,2}(?!/)\s*)?(?P<%s>[1357]/1?[2468])?'
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_TokList = [
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# mandatory part
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('type', r'METAR|SPECI'),
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('ident', r'[A-Z][A-Z0-9]{3}'),
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('itime', r'\d{6}Z'),
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('autocor', r'AUTO|COR|RTD'),
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('wind', r'(VRB|\d{3})\d{2,3}(G\d{2,3})?(KT|MPS)'),
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('wind_vrb', r'\d{3}V\d{3}'),
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# Only two-digit visibility allowed by the METAR spec is 50 (meters)
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('vsby', r'(M\d/\d|%s|\d{1,3})SM|(?:\d{3,4}|50)[NEWS]{0,2}' % _Fract),
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('rvr', r'R\w+/[MP]?\d{3,4}(V?P?\d{4})?(FT)?'),
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('funnel', r'[+]?FC'),
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('pcp', r'%s|TS(\s+%s)?' % (_pcptok, _pcptok)),
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('obv', r'%s(\s+%s)*' % (_obvtok, _obvtok)),
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('vcnty', r'[+-]?VC\w+'),
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('sky', r'SKC|CLR|VV\d{3}|(%s(\s+%s)*)' % (_Cld, _Cld)),
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('temp', r'M?\d{2}/(M?\d{2})?'),
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('alt', r'[AQ]\d{3,4}'),
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# US remarks
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('pcp1h', r'P\d{4}'),
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('tempdec', r'T[01]\d{3}[01]\d{3}'),
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('mslp', r'SLP\d{3}'),
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('sfcvis', r'SFC\s+VIS\s+M?'+_vsbytok % ('visint','visfrac')),
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('vvis', r'VIS\s+'+_vsbytok % ('vintlo','vfraclo') +'V'+_vsbytok % ('vinthi','vfrachi')),
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('vcig', r'CIG\s+(\d{3})V(\d{3})'),
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('vsky', r'(%s)(\d{3})?\s+V\s+(%s)' % ( _SkyCov, _SkyCov )),
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# is this needed?
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('any', r'\S+'),
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]
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_Tokens = '\n'.join([r"token %s: '%s' ;" % tok for tok in _TokList])
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_Rules = r"""
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START/e -> METAR/e $ e=self._metar $ ;
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METAR -> Type Ident ('NIL' '.*' | ITime autocor? Body (Remark | any*)) ;
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Body -> Wind? wind_vrb? Vsby? rvr* Funnel? Vcnty? Pcp? Obv? Vcnty? Sky? Temp? Alt? ;
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Remark -> 'RMK' (Pcp1h | TempDec | Slp | SfcVis | VVis | VCig | VSky | any)+ ;
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# PcpG -> (Pcp vcnty?) | (vcnty Pcp) ;
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Type -> type/x $ self.type(x) $ ;
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Ident -> ident/x $ self.ident(x) $ ;
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ITime -> itime/x $ self.itime(x) $ ;
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Wind -> wind/x $ self.wind(x) $ ;
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Vsby -> vsby/x $ self.vsby(x) $ ;
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Funnel -> funnel/x $ self.obv(x) $ ;
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Pcp -> pcp/x $ self.pcp(x) $ ;
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Obv -> obv/x $ self.obv(x) $ ;
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Vcnty -> vcnty/x $ self.vcnty(x) $ ;
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Sky -> sky/x $ self.sky(x) $ ;
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Temp -> temp/x $ self.temp(x) $ ;
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Alt -> alt/x $ self.alt(x) $ ;
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SfcVis -> sfcvis/x $ self.sfcvsby(x) $ ;
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VVis -> vvis/x $ self.vvis(x) $ ;
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VCig -> vcig/x $ self.vcig(x) $ ;
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VSky -> vsky/x $ self.vsky(x) $ ;
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Pcp1h -> pcp1h/x $ self.pcp1h(x) $ ;
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TempDec -> tempdec/x $ self.tempdec(x) $ ;
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Slp -> mslp/x $ self.mslp(x) $ ;
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"""
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##############################################################################
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# local functions
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def valid_day(tms):
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"""Checks if day of month is valid"""
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year, month, day = tms[:3]
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if day > 31:
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return 0
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if month in [4, 6, 9, 11] and day > 30:
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return 0
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if month == 2 and ((year%4 == 0 and day > 29) or (year%4 != 0 and day > 28)):
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return 0
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return 1
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##############################################################################
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# decoder class
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class Decoder(tpg.VerboseParser):
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"""METAR decoder class"""
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__doc__ = '\n'.join([_Options, _Separator, _Tokens, _Rules])
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verbose = 0
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# print __doc__
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def __call__(self, metar, year=None, month=None):
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self._year, self._month = year, month
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self._metar = {}
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self.expected = []
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self._first = 0
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if type(metar) is list:
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metar = '\n'.join(metar)
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try:
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return super(Decoder, self).__call__(metar)
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except tpg.SyntacticError:
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return {'fatal': {'index': self.index(),
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'error': 'Invalid token. Expecting one of:\n%s' %
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'\n'.join(self.expected)}}
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except Exception as e:
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# highlight only METAR/SPECI
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row = self._first+1
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index = ('%d.%d' % (row, 0), '%d.%d' % (row, 5))
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return {'fatal': {'index': index, 'error': 'METAR decoder bug'}}
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def index(self):
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ti = self.lexer.cur_token
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return ('%d.%d' % (ti.line+self._first, ti.start),
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'%d.%d' % (ti.end_line+self._first, ti.end_column-1))
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def eatCSL(self, name):
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"""Overrides super definition"""
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try:
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value = super(Decoder, self).eatCSL(name)
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self.expected = []
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return value
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except tpg.WrongToken:
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self.expected.append(name)
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raise
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def fix_date(self, tms):
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"""Tries to determine month and year from report timestamp.
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tms contains day, hour, min of the report, current year and month
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"""
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if self._year is not None and self._month is not None:
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tms[:2] = self._year, self._month
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else:
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now = time.time()
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t = time.mktime(tuple(tms)) - time.timezone
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if t > now + 86400.0: # previous month
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if tms[1] > 1:
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tms[1] -= 1
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else:
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tms[1] = 12
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tms[0] -= 1
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elif t < now - 25*86400.0: # next month
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if tms[1] < 12:
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tms[1] += 1
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else:
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tms[1] = 1
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tms[0] += 1
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#######################################################################
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# Methods called by the parser
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def alt(self, s):
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d = self._metar['alt'] = {'str': s, 'index': self.index()}
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v = int(s[1:])
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if s[0] == 'A':
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v *= IN_TO_MB/100.0
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if 900 < v < 1080:
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d['value'] = v
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else:
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d['error'] = 'Invalid value %.f' % v
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def ident(self, s):
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self._metar['ident'] = {'str': s, 'index': self.index()}
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def itime(self, s):
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d = self._metar['itime'] = {'str': s, 'index': self.index()}
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mday, hour, minute = int(s[:2]), int(s[2:4]), int(s[4:6])
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try:
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if mday > 31 or hour > 23 or minute > 59:
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raise Error('Invalid time')
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tms = list(time.gmtime())
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tms[2:6] = mday, hour, minute, 0
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self.fix_date(tms)
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if not valid_day(tms):
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raise Error('Invalid day')
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d['value'] = time.mktime(tuple(tms)) - time.timezone
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except Error as e:
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d['value'] = time.time() # should be fatal?
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d['error'] = str(e)
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def type(self, s):
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self._metar['type'] = {'str': s, 'index': self.index()}
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def vvis(self, s):
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d = self._metar['vvsby'] = {'str': s, 'index': self.index()}
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v = self.lexer.tokens[self.lexer.cur_token.name][0].search(s)
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vis = 0.0
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try:
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vis += float(v.group('vintlo').strip())
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except (AttributeError, ValueError):
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pass
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try:
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num, den = v.group('vfraclo').split('/', 1)
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vis += float(num)/float(den)
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except (AttributeError, ValueError):
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pass
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if vis > 50.0:
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if vis > 9998.:
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vis = 7.0
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else:
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vis = vis*M_TO_SM
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d['lo'] = vis
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vis = 0.0
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try:
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vis += float(v.group('vinthi').strip())
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except (AttributeError, ValueError):
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pass
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try:
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num, den = v.group('vfrachi').split('/', 1)
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vis += float(num)/float(den)
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except (AttributeError, ValueError):
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pass
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if vis > 50.0:
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if vis > 9998.:
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vis = 7.0
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else:
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vis = vis*M_TO_SM
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d['hi'] = vis
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#
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# Bad token processed
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if d['hi'] < d['lo']:
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del self._metar['vvsby']
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raise tpg.WrongToken
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#
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# SFC VIS always overrides the prevailing visibility
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def sfcvsby(self, s):
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v = self.lexer.tokens[self.lexer.cur_token.name][0].search(s)
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vis = 0.0
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metric = True
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try:
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vis += float(v.group('visint').strip())
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except (AttributeError, ValueError):
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pass
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try:
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num, den = v.group('visfrac').split('/', 1)
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vis += float(num)/float(den)
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metric = False
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except (AttributeError, ValueError):
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pass
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#
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# It would be unusual if visibility wasn't already in the
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# dictionary
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try:
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d = self._metar['vsby']
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if 'SM' in d['str']:
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metric = False
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d['str'] = s
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d['index'] = self.index()
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except KeyError:
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d = self._metar['vsby'] = {'str': s,
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'index': self.index()}
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if vis > 50.0:
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metric = True
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if metric:
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if vis > 9998.:
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vis = 7.0
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else:
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vis = vis*M_TO_SM
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d['value'] = vis
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def vsby(self, s):
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d = self._metar['vsby'] = {'str': s, 'index': self.index()}
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if s[0] == 'M': # M1/4SM
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v = 0.0
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elif 'SM' in s: # miles
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tok = s[:-2].split()
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if len(tok) > 1:
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v = float(tok[0])
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num, den = tok[1].split('/', 1)
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v += float(num)/float(den)
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else:
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if '/' in tok[0]:
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num, den = tok[0].split('/', 1)
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if len(num) > 1: # 11/4 (missing space)
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v = float(num[0])
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num = num[1:]
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else:
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v = 0.0
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v += float(num)/float(den)
|
|
else:
|
|
v = float(tok[0])
|
|
else: # meters
|
|
for n, x in enumerate(s):
|
|
if not x.isdigit():
|
|
v = float(s[:n])*M_TO_SM
|
|
break
|
|
else:
|
|
v = float(s)*M_TO_SM
|
|
|
|
if v > 6.2:
|
|
v = 7.0
|
|
|
|
d['value'] = v
|
|
|
|
def wind(self, s):
|
|
d = self._metar['wind'] = {'str': s, 'index': self.index()}
|
|
try:
|
|
if s.startswith('VRB'):
|
|
dd = 'VRB'
|
|
else:
|
|
if s[2] != '0':
|
|
raise Error('Invalid direction')
|
|
dd = int(s[:3])
|
|
if 'MPS' in s:
|
|
tok = s[3:-3].split('G', 1)
|
|
factor = MPS_TO_KT
|
|
else:
|
|
tok = s[3:-2].split('G', 1)
|
|
factor = 1
|
|
ff = int(tok[0]) * factor
|
|
if ff > 100:
|
|
raise Error('Invalid speed')
|
|
d.update({'dd': dd, 'ff': ff})
|
|
if len(tok) > 1:
|
|
gg = int(tok[1]) * factor
|
|
if gg <= ff or gg - ff > 40:
|
|
raise Error('Invalid gust')
|
|
d['gg'] = gg
|
|
else:
|
|
gg = None
|
|
except Error as e:
|
|
d['error'] = str(e)
|
|
|
|
def obv(self, s):
|
|
if 'obv' in self._metar:
|
|
return
|
|
self._metar['obv'] = {'str': s, 'index': self.index()}
|
|
|
|
def pcp(self, s):
|
|
self._metar['pcp'] = {'str': s, 'index': self.index()}
|
|
|
|
def vcnty(self, s):
|
|
d = self._metar['vcnty'] = {'str': s, 'index': self.index()}
|
|
if not s[2:] in _ValidVcnty:
|
|
d['error'] = 'Invalid weather in vicinity'
|
|
|
|
def sky(self, s):
|
|
cig = Avn.UNLIMITED
|
|
cover = 0
|
|
for n, tok in enumerate(s.split()):
|
|
if tok.startswith('VV'):
|
|
cig = int(tok[2:])
|
|
cover = 4
|
|
elif tok == 'CLR':
|
|
cig = Avn.CLEAR
|
|
break
|
|
elif tok == 'SKC':
|
|
cig = Avn.UNLIMITED
|
|
break
|
|
elif tok.startswith('FEW'):
|
|
cover = 1
|
|
elif tok.startswith('SCT'):
|
|
cover = 2
|
|
elif tok.startswith('BKN'):
|
|
cover = 3
|
|
cig = min(cig, int(tok[3:6]))
|
|
elif tok.startswith('OVC'):
|
|
cover = 4
|
|
cig = min(cig, int(tok[3:6]))
|
|
self._metar['sky'] = {'str': s, 'index': self.index(), \
|
|
'cover': cover, 'cig': 100*cig}
|
|
|
|
def vsky(self,s):
|
|
d = self._metar['vsky'] = {'str': s, 'index': self.index()}
|
|
v = self.lexer.tokens[self.lexer.cur_token.name][0].search(s)
|
|
d['cvr1'] = {'FEW':1,'SCT':2,'BKN':3,'OVC':4}.get(v.group(1),4)
|
|
d['cvr2'] = {'FEW':1,'SCT':2,'BKN':3,'OVC':4}.get(v.group(3),4)
|
|
|
|
try:
|
|
d['cig'] = int(v.group(2))*100
|
|
except (AttributeError,TypeError):
|
|
try:
|
|
d['cig'] = self._metar['sky']['cig']
|
|
except KeyError:
|
|
pass
|
|
|
|
def vcig(self,s):
|
|
d = self._metar['vcig'] = {'str': s, 'index': self.index()}
|
|
v = self.lexer.tokens[self.lexer.cur_token.name][0].search(s)
|
|
d['lo']=int(v.group(1))*100
|
|
d['hi']=int(v.group(2))*100
|
|
|
|
def temp(self, s):
|
|
d = self._metar['temp'] = {'str': s, 'index': self.index()}
|
|
tok = s.split('/')
|
|
if tok[0][0] == 'M':
|
|
tt = -int(tok[0][1:])
|
|
else:
|
|
tt = int(tok[0])
|
|
try:
|
|
if tok[1][0] == 'M':
|
|
td = -int(tok[1][1:])
|
|
else:
|
|
td = int(tok[1])
|
|
except IndexError:
|
|
td = None
|
|
if -60 < tt < 50:
|
|
d['tt'] = tt
|
|
else:
|
|
d['error'] = 'Invalid temperature'
|
|
if td is not None and -60 < td <= tt:
|
|
d['td'] = td
|
|
else:
|
|
d['error'] = 'Invalid temperature'
|
|
|
|
def tempdec(self, s):
|
|
d = self._metar['tempdec'] = {'str': s, 'index': self.index()}
|
|
tt = float(s[2:5])/10.0
|
|
if s[1] == '1':
|
|
tt = -tt
|
|
td = float(s[6:9])/10.0
|
|
if s[5] == '1':
|
|
td = -td
|
|
if -60.0 < tt < 50.0 and -60.0 < td <= tt:
|
|
d.update({'tt': tt, 'td': td})
|
|
else:
|
|
d['error'] = 'Invalid temperature'
|
|
|
|
def pcp1h(self, s):
|
|
self._metar['pcp1h'] = {'str': s, 'index': self.index(), \
|
|
'value': float(s[1:])/100.0}
|
|
|
|
def mslp(self, s):
|
|
p = float(s[3:])/100.0
|
|
if p >= 50.0:
|
|
p += 900.0
|
|
else:
|
|
p += 1000.0
|
|
try:
|
|
if p - self._metar['alt']['value'] > 80.0:
|
|
p -= 100.0
|
|
elif p - self._metar['alt']['value'] < -80.0:
|
|
p += 100.0
|
|
self._metar['mslp'] = {'str': s, 'index': self.index(), 'value': p}
|
|
except KeyError:
|
|
pass # missing/bad altimeter
|
|
|
|
##############################################################################
|
|
# public part
|
|
def errors(decoded):
|
|
"""Returns list of elements that have 'error' or 'warning' key"""
|
|
d = {'error': [], 'warning': []}
|
|
def walk(item, k=None):
|
|
if type(item) is list:
|
|
for i in item:
|
|
walk(i)
|
|
elif type(item) is dict:
|
|
if 'error' in item:
|
|
d['error'].append((k, item))
|
|
elif 'warning' in item:
|
|
d['warning'].append((k, item))
|
|
else:
|
|
for k, v in item.items():
|
|
walk(v, k)
|
|
if 'fatal' in decoded:
|
|
return d
|
|
walk(decoded)
|
|
return d
|
|
|
|
##############################################################################
|
|
# test
|
|
def main(report):
|
|
for n, line in enumerate(report):
|
|
if line.startswith('METAR') or line.startswith('SPECI'):
|
|
metar = ''.join(report[n:])
|
|
break
|
|
else:
|
|
raise Avn.AvnError('Cannot find METAR')
|
|
print(metar)
|
|
decoder = Decoder()
|
|
decoded = decoder(metar)
|
|
if 'fatal' in decoded:
|
|
print('Fatal error at ' + str(decoded['fatal']))
|
|
for key in decoded:
|
|
print(str(key) + ' ' + str(decoded[key]))
|
|
errlist = errors(decoded)
|
|
for k, d in errlist['error']:
|
|
print(str(k) + ' ' + str(d['index']) + ' ' + str(d['error']))
|
|
# decoder does not produce warnings
|
|
|
|
if __name__ == '__main__':
|
|
import sys
|
|
main(sys.stdin.readlines())
|