A PCRE internal error occured. This might be caused by a faulty plugin

====== Buzz Syntax BNF Specification ====== For an example-driven explanation of the Buzz syntax, see the [[buzz_syntax_cheatsheet|syntax cheatsheet]]. In what follows, we report a formal [[https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_Form|Backus-Naur Form grammar]] specification. ===== Tokens ===== An **identifier** in Buzz is defined by this regular expression: [[:alpha:]_][[:alnum:]_]* The recognized tokens are: ^ Token ^ Id ^ | //identifier// | ''TOKID'' | | //numeric constant// | ''TOKCONST'' | | '''''_string_''''' ''"''_string_''"'' | ''TOKSTRING'' | | ''var'' | ''TOKVAR'' | | ''nil'' | ''TOKNIL'' | | ''if'' | ''TOKIF'' | | ''else'' | ''TOKELSE'' | | ''function'' | ''TOKFUN'' | | ''return'' | ''TOKRETURN'' | | ''for'' | ''TOKFOR'' | | ''while'' | ''TOKWHILE'' | | ''and'', ''or'' | ''TOKLANDOR'' | | ''not'' | ''TOKLNOT'' | | ''+'', ''-'' | ''TOKADDSUB'' | | ''*'', ''/'' | ''TOKMULDIV'' | | ''%'' | ''TOKMOD'' | | ''^'' | ''TOKPOW'' | | ''<<'' ''>>'' | ''TOKLRSHIFT'' | | ''&'' ''|'' | ''TOKBANDOR'' | | ''!'' | ''TOKBNOT'' | | ''{'' | ''TOKBLOCKOPEN'' | | ''}'' | ''TOKBLOCKCLOSE'' | | ''('' | ''TOKPAROPEN'' | | '')'' | ''TOKPARCLOSE'' | | ''['' | ''TOKIDXOPEN'' | | '']'' | ''TOKIDXCLOSE'' | | '';'' ''\n'' | ''TOKSTATEND'' | | '','' | ''TOKLISTSEP'' | | ''='' | ''TOKASSIGN'' | | ''.'' | ''TOKDOT'' | | ''<'' ''<='' ''>'' ''>='' ''=='' ''!='' | ''TOKCMP'' | ===== Grammar ===== script ::= statlist statlist ::= stat | statlist stat stat ::= <nil> | vardef | fundef | if | loop | command block ::= TOKBLOCKOPEN statlist TOKBLOCKCLOSE vardef ::= TOKVAR TOKID | TOKVAR TOKID assignment fundef ::= TOKFUN TOKID TOKPAROPEN idlist TOKPARCLOSE block if ::= TOKIF TOKPAROPEN condition TOKPARCLOSE block endif endif ::= <nil> | TOKELSE block loop ::= forloop | whileloop forloop ::= TOKFOR TOKPAROPEN idref TOKASSIGN expression TOKLISTSEP condition TOKLISTSEP idref TOKASSIGN expression TOKPARCLOSE block whileloop ::= TOKWHILE TOKPAROPEN condition TOKPARCLOSE block conditionlist ::= condition | conditionlist TOKLISTSEP condition condition ::= comparison | condition TOKLANDOR comparison | TOKLNOT condition comparison ::= expression | expression TOKCMP expression expression ::= product | expression TOKADDSUB product product ::= modulo | product TOKMULDIV modulo modulo ::= power | modulo TOKMOD power power ::= bitshift powerrest powerrest ::= <nil> | TOKPOW power bitshift ::= bitwiseandor | operand TOKLRSHIFT bitwiseandor bitwiseandor ::= bitwisenot | bitwiseandor TOKBANDOR bitwisenot bitwisenot ::= operand | bitwisenot TOKBANDOR operand operand ::= TOKNIL | TOKCONST | TOKSTRING | TOKPAROPEN condition TOKPARCLOSE | TOKADDSUB power | idref | lambda | tabledef command ::= idref | idref assignment | TOKRETURN expression assignment ::= TOKASSIGN expression tabledef ::= TOKBLOCKOPEN TOKBLOCKCLOSE | TOKBLOCKOPEN tablefielddeflist TOKBLOCKCLOSE tablefielddef ::= TOKDOT TOKID assignment | TOKDOT TOKCONST assignment tablefielddeflist ::= tablefielddef | tablefielddeflist TOKLISTSEP tablefielddef idlist ::= <nil> | TOKID | idlist TOKLISTSEP TOKID idreflist ::= idref | idreflist TOKLISTSEP idref idref ::= TOKID | idref TOKDOT TOKID | idref TOKIDXOPEN expression TOKIDXCLOSE | idref TOKPAROPEN conditionlist TOKPARCLOSE lambda ::= TOKFUN TOKPAROPEN idlist TOKPARCLOSE block