PPT Slide

// Parse slash-delimited book data.

%%

%class lex

%standalone

%unicode

%line

%column

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

Slash = "/"

Field = [^/\r\n]+

%{

StringBuffer line = new StringBuffer();

private void add_identifier_to_buffer(String s) {

line.append("[" + yyline + ", " + yycolumn + "]" + s);

}

private void add_delimiter_to_buffer(String s) {

line.append(s);

}

private void display_line() {

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

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

}

%}

%%

{Field} { add_identifier_to_buffer(yytext()); }

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

{LineTerminator} { display_line(); }

<<EOF>> { return 0; }

Turn on line and

column counting

We will print the location

[line, column] of each field

token.

mylexer.flex

See example04

Do Lab5

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