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The Error Reporting Function yyerror. The Bison parser detects a parse error or syntax error whenever it reads a token which cannot satisfy any syntax rule. The Bison parser expects to report the error by calling an error reporting function named yyerror , which you must supply. It is called by yyparse whenever a syntax error is found, and it receives one argument. For a parse error, the string is normally "parse error". The parser can detect one other kind of error: stack overflow. This happens when the input contains constructions that are very deeply nested.
The Bison parser detects a syntax error (or parse error) whenever it reads a token It is called by yyparse whenever a syntax error is found, and it receives one.
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The Bison parser detects a syntax error or parse error whenever it reads a token which cannot satisfy any syntax rule. The Bison parser yyparse to error the error by calling an error reporting function named yyerrorwhich you must supply. It is called by yyparse whenever a syntax error is found, and it receives one argument.
You call the function yyparse to cause parsing to occur. actions, and ultimately returns when it encounters end-of-input or an unrecoverable syntax error.
You create a yacc parser with the command:. It is not strictly necessary. The output is a file of C-language subroutines called y. The function produced by yacc is called yyparse error, and is integer-valued. When it is called, it repeatedly calls yylexthe lexical analyzer supplied yyparse the user see "Lexical Analysis "to obtain input tokens.
The problem is that your yywrap function is returning 0 (false == not yet wrapped up, more input needs to be read), but is not setting up the input.
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The value is 1 if parsing failed (return is due to a syntax error). In an action, you can cause immediate return from yyparse by using these macros: YYACCEPT.
Once yyerror() returns to yyparse(), the parser proceeds popping down the stack in search of a state that can handle errors. If another error is encountered soon.
yyparse() returns a value of 0 if the input it parses is valid according to the given grammar rules. It returns a 1 if the input is incorrect and error recovery is.
Eventually, an error is detected, yyparse() returns the value 1, and no error recovery is possible, or the lexical analyzer returns the end-marker token and the.