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Scala Parser Combinators

Examples

Basic Example


import scala.util.parsing.combinator._
class SimpleParser extends RegexParsers {
 // Define a grammar rule, turn it into a regex, and apply it the input.
 def word: Parser[String] = """[A-Z][a-z]+""".r ^^ { _.toString }
}
object SimpleParser extends SimpleParser {
 val parseAlice = parse(word, "Alice went to Alamo Square.")
 val parseBarb = parse(word, "barb went Upside Down.")
}
//Successfully finds a match
println(SimpleParser.parseAlice)
//Fails to find a match
println(SimpleParser.parseBarb)

The output will be as follows:

[1.6] parsed: Alice
res0: Unit = ()
[1.1] failure: string matching regex `[A-Z][a-z]+' expected but `b' found
barb went Upside Down.
^

[1.6] in the Alice example indicates that the start of the match is at position 1, and the fist character remaining to match starts at position 6.


Conclusion

In this page (written and validated by ) you learned about Scala Parser Combinators . What's Next? If you are interested in completing Scala tutorial, your next topic will be learning about: Scala Partial Functions.



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