PPT Slide

// Parse slash-delimited book data.

%%

%class lex

%standalone

%unicode

LineTerminator = \r|\n|\r\n

Slash = "/"

Field = [^/\r\n]+

%{

StringBuffer line = new StringBuffer();

private void add_to_buffer(String s) {

line.append(s);

}

private void display_line() {

System.out.println(line.toString());

line = new StringBuffer(); /* Clear buffer */

}

%}

%%

{Field} { add_to_buffer(yytext()); }

{Slash} { add_to_buffer("/"); }

{LineTerminator} { display_line(); }

<<EOF>> { return 0; }

mylexer.flex

See example03

This code will get

inserted verbatim

into the parser

Instructing the lexer to

invoke the add_to_buffer()

method after it has

consumed a Field token.

Do Lab4

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