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/usr/lib/firefox-esr-devel-52/sdk/bin/xpidllex.py is in firefox-esr-dev 52.8.1esr-1~deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# xpidllex.py. This file automatically created by PLY (version 3.3). Don't edit!
_tabversion   = '3.3'
_lextokens    = {'TYPEDEF': 1, 'INCLUDE': 1, 'RSHIFT': 1, 'LSHIFT': 1, 'ATTRIBUTE': 1, 'NATIVEID': 1, 'NUMBER': 1, 'NATIVE': 1, 'IID': 1, 'READONLY': 1, 'RAISES': 1, 'CDATA': 1, 'IN': 1, 'INTERFACE': 1, 'CONST': 1, 'IDENTIFIER': 1, 'OUT': 1, 'INOUT': 1, 'HEXNUM': 1}
_lexreflags   = 0
_lexliterals  = '"(){}[],;:=|+-*'
_lexstateinfo = {'nativeid': 'exclusive', 'INITIAL': 'inclusive'}
_lexstatere   = {'nativeid': [('(?P<t_nativeid_NATIVEID>[^()\\n]+(?=\\)))', [None, ('t_nativeid_NATIVEID', 'NATIVEID')])], 'INITIAL': [('(?P<t_multilinecomment>/\\*(?s).*?\\*/)|(?P<t_singlelinecomment>(?m)//.*?$)|(?P<t_IID>[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})|(?P<t_IDENTIFIER>(unsigned\\ long\\ long|unsigned\\ short|unsigned\\ long|long\\ long)(?!_?[A-Za-z][A-Za-z_0-9])|_?[A-Za-z][A-Za-z_0-9]*)|(?P<t_LCDATA>(?s)%\\{[ ]*C\\+\\+[ ]*\\n(?P<cdata>.*?\\n?)%\\}[ ]*(C\\+\\+)?)|(?P<t_INCLUDE>\\#include[ \\t]+"[^"\\n]+")|(?P<t_directive>\\#(?P<directive>[a-zA-Z]+)[^\\n]+)|(?P<t_newline>\\n+)|(?P<t_HEXNUM>0x[a-fA-F0-9]+)|(?P<t_NUMBER>-?\\d+)|(?P<t_LSHIFT><<)|(?P<t_RSHIFT>>>)', [None, ('t_multilinecomment', 'multilinecomment'), ('t_singlelinecomment', 'singlelinecomment'), ('t_IID', 'IID'), ('t_IDENTIFIER', 'IDENTIFIER'), None, ('t_LCDATA', 'LCDATA'), None, None, ('t_INCLUDE', 'INCLUDE'), ('t_directive', 'directive'), None, ('t_newline', 'newline'), (None, 'HEXNUM'), (None, 'NUMBER'), (None, 'LSHIFT'), (None, 'RSHIFT')])]}
_lexstateignore = {'nativeid': '', 'INITIAL': ' \t'}
_lexstateerrorf = {'nativeid': 't_ANY_error', 'INITIAL': 't_ANY_error'}