uk.ac.ed.epcc.safe.accounting.expr.parse

Interface ExpressionParser.Lexer

All Known Implementing Classes:

ExpressionLexer

Enclosing class:

ExpressionParser

public static interface ExpressionParser.Lexer

Communication interface between the scanner and the Bison-generated parser ExpressionParser.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	getLVal() Method to retrieve the semantic value of the last scanned token.
void	yyerror(java.lang.String s) Entry point for error reporting.
int	yylex() Entry point for the scanner.

Method Detail

getLVal

java.lang.Object getLVal()

Method to retrieve the semantic value of the last scanned token.

Returns:

the semantic value of the last scanned token.

yylex

int yylex()
          throws LexException

Entry point for the scanner. Returns the token identifier corresponding to the next token and prepares to return the semantic value of the token.

Throws:

LexException

Returns:

the token identifier corresponding to the next token.

yyerror

void yyerror(java.lang.String s)

Entry point for error reporting. Emits an error in a user-defined way.

Parameters:

s - The string for the error message.