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<HTML><HEAD><!-- This HTML file has been created by texi2html 1.44 from /opt/src/gnu/bison-1.25/bison.texinfo on 30 June 1997 --><TITLE>Bison 1.25 - Bison Symbols</TITLE></HEAD><BODY>Go to the <A HREF="bison_1.html">first</A>, <A HREF="bison_12.html">previous</A>, <A HREF="bison_14.html">next</A>, <A HREF="bison_15.html">last</A> section, <A HREF="index.html">table of contents</A>.<HR><H1><A NAME="SEC91" HREF="index.html#SEC91">Bison Symbols</A></H1><P><A NAME="IDX197"></A><A NAME="IDX198"></A></P><DL COMPACT><DT><CODE>error</CODE><DD>A token name reserved for error recovery. This token may be used ingrammar rules so as to allow the Bison parser to recognize an error inthe grammar without halting the process. In effect, a sentencecontaining an error may be recognized as valid. On a parse error, thetoken <CODE>error</CODE> becomes the current look-ahead token. Actionscorresponding to <CODE>error</CODE> are then executed, and the look-aheadtoken is reset to the token that originally caused the violation.See section <A HREF="bison_9.html#SEC81">Error Recovery</A>.<DT><CODE>YYABORT</CODE><DD>Macro to pretend that an unrecoverable syntax error has occurred, bymaking <CODE>yyparse</CODE> return 1 immediately. The error reportingfunction <CODE>yyerror</CODE> is not called. See section <A HREF="bison_7.html#SEC60">The Parser Function <CODE>yyparse</CODE></A>.<DT><CODE>YYACCEPT</CODE><DD>Macro to pretend that a complete utterance of the language has beenread, by making <CODE>yyparse</CODE> return 0 immediately. See section <A HREF="bison_7.html#SEC60">The Parser Function <CODE>yyparse</CODE></A>.<DT><CODE>YYBACKUP</CODE><DD>Macro to discard a value from the parser stack and fake a look-aheadtoken. See section <A HREF="bison_7.html#SEC67">Special Features for Use in Actions</A>.<DT><CODE>YYERROR</CODE><DD>Macro to pretend that a syntax error has just been detected: call<CODE>yyerror</CODE> and then perform normal error recovery if possible(see section <A HREF="bison_9.html#SEC81">Error Recovery</A>), or (if recovery is impossible) make<CODE>yyparse</CODE> return 1. See section <A HREF="bison_9.html#SEC81">Error Recovery</A>.<DT><CODE>YYERROR_VERBOSE</CODE><DD>Macro that you define with <CODE>#define</CODE> in the Bison declarationssection to request verbose, specific error message strings when<CODE>yyerror</CODE> is called.<DT><CODE>YYINITDEPTH</CODE><DD>Macro for specifying the initial size of the parser stack.See section <A HREF="bison_8.html#SEC80">Stack Overflow, and How to Avoid It</A>.<DT><CODE>YYLEX_PARAM</CODE><DD>Macro for specifying an extra argument (or list of extra arguments) for<CODE>yyparse</CODE> to pass to <CODE>yylex</CODE>. See section <A HREF="bison_7.html#SEC65">Calling Conventions for Pure Parsers</A>.<DT><CODE>YYLTYPE</CODE><DD>Macro for the data type of <CODE>yylloc</CODE>; a structure with fourmembers. See section <A HREF="bison_7.html#SEC64">Textual Positions of Tokens</A>.<DT><CODE>yyltype</CODE><DD>Default value for YYLTYPE.<DT><CODE>YYMAXDEPTH</CODE><DD>Macro for specifying the maximum size of the parser stack.See section <A HREF="bison_8.html#SEC80">Stack Overflow, and How to Avoid It</A>.<DT><CODE>YYPARSE_PARAM</CODE><DD>Macro for specifying the name of a parameter that <CODE>yyparse</CODE> shouldaccept. See section <A HREF="bison_7.html#SEC65">Calling Conventions for Pure Parsers</A>.<DT><CODE>YYRECOVERING</CODE><DD>Macro whose value indicates whether the parser is recovering from asyntax error. See section <A HREF="bison_7.html#SEC67">Special Features for Use in Actions</A>.<DT><CODE>YYSTYPE</CODE><DD>Macro for the data type of semantic values; <CODE>int</CODE> by default.See section <A HREF="bison_6.html#SEC44">Data Types of Semantic Values</A>.<DT><CODE>yychar</CODE><DD>External integer variable that contains the integer value of thecurrent look-ahead token. (In a pure parser, it is a local variablewithin <CODE>yyparse</CODE>.) Error-recovery rule actions may examine thisvariable. See section <A HREF="bison_7.html#SEC67">Special Features for Use in Actions</A>.<DT><CODE>yyclearin</CODE><DD>Macro used in error-recovery rule actions. It clears the previouslook-ahead token. See section <A HREF="bison_9.html#SEC81">Error Recovery</A>.<DT><CODE>yydebug</CODE><DD>External integer variable set to zero by default. If <CODE>yydebug</CODE>is given a nonzero value, the parser will output information on inputsymbols and parser action. See section <A HREF="bison_11.html#SEC86">Debugging Your Parser</A>.<DT><CODE>yyerrok</CODE><DD>Macro to cause parser to recover immediately to its normal modeafter a parse error. See section <A HREF="bison_9.html#SEC81">Error Recovery</A>.<DT><CODE>yyerror</CODE><DD>User-supplied function to be called by <CODE>yyparse</CODE> on error. Thefunction receives one argument, a pointer to a character stringcontaining an error message. See section <A HREF="bison_7.html#SEC66">The Error Reporting Function <CODE>yyerror</CODE></A>.<DT><CODE>yylex</CODE><DD>User-supplied lexical analyzer function, called with no argumentsto get the next token. See section <A HREF="bison_7.html#SEC61">The Lexical Analyzer Function <CODE>yylex</CODE></A>.<DT><CODE>yylval</CODE><DD>External variable in which <CODE>yylex</CODE> should place the semanticvalue associated with a token. (In a pure parser, it is a localvariable within <CODE>yyparse</CODE>, and its address is passed to<CODE>yylex</CODE>.) See section <A HREF="bison_7.html#SEC63">Semantic Values of Tokens</A>.<DT><CODE>yylloc</CODE><DD>External variable in which <CODE>yylex</CODE> should place the line andcolumn numbers associated with a token. (In a pure parser, it is alocal variable within <CODE>yyparse</CODE>, and its address is passed to<CODE>yylex</CODE>.) You can ignore this variable if you don't use the<SAMP>`@'</SAMP> feature in the grammar actions. See section <A HREF="bison_7.html#SEC64">Textual Positions of Tokens</A>.<DT><CODE>yynerrs</CODE><DD>Global variable which Bison increments each time there is a parseerror. (In a pure parser, it is a local variable within<CODE>yyparse</CODE>.) See section <A HREF="bison_7.html#SEC66">The Error Reporting Function <CODE>yyerror</CODE></A>.<DT><CODE>yyparse</CODE><DD>The parser function produced by Bison; call this function to startparsing. See section <A HREF="bison_7.html#SEC60">The Parser Function <CODE>yyparse</CODE></A>.<DT><CODE>%left</CODE><DD>Bison declaration to assign left associativity to token(s).See section <A HREF="bison_6.html#SEC51">Operator Precedence</A>.<DT><CODE>%no_lines</CODE><DD>Bison declaration to avoid generating <CODE>#line</CODE> directives in theparser file. See section <A HREF="bison_6.html#SEC57">Bison Declaration Summary</A>.<DT><CODE>%nonassoc</CODE><DD>Bison declaration to assign nonassociativity to token(s).See section <A HREF="bison_6.html#SEC51">Operator Precedence</A>.<DT><CODE>%prec</CODE><DD>Bison declaration to assign a precedence to a specific rule.See section <A HREF="bison_8.html#SEC76">Context-Dependent Precedence</A>.<DT><CODE>%pure_parser</CODE><DD>Bison declaration to request a pure (reentrant) parser.See section <A HREF="bison_6.html#SEC56">A Pure (Reentrant) Parser</A>.<DT><CODE>%raw</CODE><DD>Bison declaration to use Bison internal token code numbers in tokentables instead of the usual Yacc-compatible token code numbers.See section <A HREF="bison_6.html#SEC57">Bison Declaration Summary</A>.<DT><CODE>%right</CODE><DD>Bison declaration to assign right associativity to token(s).See section <A HREF="bison_6.html#SEC51">Operator Precedence</A>.<DT><CODE>%start</CODE><DD>Bison declaration to specify the start symbol. See section <A HREF="bison_6.html#SEC55">The Start-Symbol</A>.<DT><CODE>%token</CODE><DD>Bison declaration to declare token(s) without specifying precedence.See section <A HREF="bison_6.html#SEC50">Token Type Names</A>.<DT><CODE>%token_table</CODE><DD>Bison declaration to include a token name table in the parser file.See section <A HREF="bison_6.html#SEC57">Bison Declaration Summary</A>.<DT><CODE>%type</CODE><DD>Bison declaration to declare nonterminals. See section <A HREF="bison_6.html#SEC53">Nonterminal Symbols</A>.<DT><CODE>%union</CODE><DD>Bison declaration to specify several possible data types for semanticvalues. See section <A HREF="bison_6.html#SEC52">The Collection of Value Types</A>.</DL><P>These are the punctuation and delimiters used in Bison input:</P><DL COMPACT><DT><SAMP>`%%'</SAMP><DD>Delimiter used to separate the grammar rule section from theBison declarations section or the additional C code section.See section <A HREF="bison_4.html#SEC14">The Overall Layout of a Bison Grammar</A>.<DT><SAMP>`%{ %}'</SAMP><DD>All code listed between <SAMP>`%{'</SAMP> and <SAMP>`%}'</SAMP> is copied directlyto the output file uninterpreted. Such code forms the "Cdeclarations" section of the input file. See section <A HREF="bison_6.html#SEC35">Outline of a Bison Grammar</A>.<DT><SAMP>`/*...*/'</SAMP><DD>Comment delimiters, as in C.<DT><SAMP>`:'</SAMP><DD>Separates a rule's result from its components. See section <A HREF="bison_6.html#SEC41">Syntax of Grammar Rules</A>.<DT><SAMP>`;'</SAMP><DD>Terminates a rule. See section <A HREF="bison_6.html#SEC41">Syntax of Grammar Rules</A>.<DT><SAMP>`|'</SAMP><DD>Separates alternate rules for the same result nonterminal.See section <A HREF="bison_6.html#SEC41">Syntax of Grammar Rules</A>.</DL><HR>Go to the <A HREF="bison_1.html">first</A>, <A HREF="bison_12.html">previous</A>, <A HREF="bison_14.html">next</A>, <A HREF="bison_15.html">last</A> section, <A HREF="index.html">table of contents</A>.</BODY></HTML>⌨️ 快捷键说明
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