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Programming language: Scala
License: Apache License 2.0
Tags: Parsing    
Latest version: v1.1.2

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README

scala-parser-combinators

Scala Standard Parser Combinator Library

This library was originally part of the Scala standard library, but is now community-maintained, under the guidance of the Scala team at Lightbend. If you are interested in helping please contact @Philippus or @SethTisue.

The latest stable release is 2.0.0.

Documentation

Adding an sbt dependency

To depend on scala-parser-combinators in sbt, add something like this to your build.sbt:

libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.0.0"

To support multiple Scala versions, see the example in scala/scala-module-dependency-sample.

Scala.js and Scala Native

Scala-parser-combinators is also available for Scala.js and Scala Native:

libraryDependencies += "org.scala-lang.modules" %%% "scala-parser-combinators" % "2.0.0"

Example

import scala.util.parsing.combinator._

case class WordFreq(word: String, count: Int) {
  override def toString = s"Word <$word> occurs with frequency $count"
}

class SimpleParser extends RegexParsers {
  def word: Parser[String]   = """[a-z]+""".r       ^^ { _.toString }
  def number: Parser[Int]    = """(0|[1-9]\d*)""".r ^^ { _.toInt }
  def freq: Parser[WordFreq] = word ~ number        ^^ { case wd ~ fr => WordFreq(wd,fr) }
}

object TestSimpleParser extends SimpleParser {
  def main(args: Array[String]) = {
    parse(freq, "johnny 121") match {
      case Success(matched,_) => println(matched)
      case Failure(msg,_) => println(s"FAILURE: $msg")
      case Error(msg,_) => println(s"ERROR: $msg")
    }
  }
}

For a detailed unpacking of this example see [Getting Started](docs/Getting_Started.md).

Contributing

Alternatives

A number of other parsing libraries for Scala are available; see https://github.com/lauris/awesome-scala#parsing