Contents - Cultural View

Parboiled (Java) 249
}
}
return sequence(
);
factor(),
zeroOrMore(
public Rule factor() {
}
)
return firstOf(
);
sequence(
)
number(),
public Rule number() {
}
firstOf('*', '/'),
factor()
sequence('(', expression(), ')')
return oneOrMore(charRange('0', '9'));
The class defines the parser rules for the language (yet without any actions), which could be used to parse actual
input with code such as this:
String input = "1+2";
CalculatorParser parser =
Parboiled.createParser(CalculatorParser.class);
ParsingResult result = ReportingParseRunner.run(parser.expression(),
input);
String parseTreePrintOut = ParseTreeUtils.printNodeTree(result);
System.out.println(parseTreePrintOut);
See also
• Parsing expression grammars
• Regular expressions
• ANTLR
• JavaCC
External links
• Official parboiled web site [1]
• Example of a complete Java 5 parser written with parboiled [2]