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1 | | -scala-parser-combinators [<img src="https://img.shields.io/travis/scala/scala-parser-combinators.svg"/>](https://travis-ci.org/scala/scala-parser-combinators) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-parser-combinators_2.11.svg?label=latest%20release%20for%202.11"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-parser-combinators_2.11) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-parser-combinators_2.12.svg?label=latest%20release%20for%202.12"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-parser-combinators_2.12) [](https://gitter.im/scala/scala-parser-combinators) |
2 | | -======================== |
| 1 | +# scala-parser-combinators [<img src="https://img.shields.io/travis/scala/scala-parser-combinators.svg"/>](https://travis-ci.org/scala/scala-parser-combinators) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-parser-combinators_2.11.svg?label=latest%20release%20for%202.11"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-parser-combinators_2.11) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-parser-combinators_2.12.svg?label=latest%20release%20for%202.12"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-parser-combinators_2.12) [](https://gitter.im/scala/scala-parser-combinators) |
3 | 2 |
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4 | 3 | ### Scala Standard Parser Combinator Library |
5 | 4 |
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@@ -29,24 +28,23 @@ To support multiple Scala versions, see the example in [scala/scala-module-depen |
29 | 28 | import scala.util.parsing.combinator._ |
30 | 29 |
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31 | 30 | case class WordFreq(word: String, count: Int) { |
32 | | - override def toString = "Word <" + word + "> " + |
33 | | - "occurs with frequency " + count |
| 31 | + override def toString = s"Word <$word> occurs with frequency $count" |
34 | 32 | } |
35 | 33 |
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36 | 34 | class SimpleParser extends RegexParsers { |
37 | | - def word: Parser[String] = """[a-z]+""".r ^^ { _.toString } |
38 | | - def number: Parser[Int] = """(0|[1-9]\d*)""".r ^^ { _.toInt } |
39 | | - def freq: Parser[WordFreq] = word ~ number ^^ { case wd ~ fr => WordFreq(wd,fr) } |
| 35 | + def word: Parser[String] = """[a-z]+""".r ^^ { _.toString } |
| 36 | + def number: Parser[Int] = """(0|[1-9]\d*)""".r ^^ { _.toInt } |
| 37 | + def freq: Parser[WordFreq] = word ~ number ^^ { case wd ~ fr => WordFreq(wd,fr) } |
40 | 38 | } |
41 | 39 |
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42 | 40 | object TestSimpleParser extends SimpleParser { |
43 | | - def main(args: Array[String]) = { |
44 | | - parse(freq, "johnny 121") match { |
45 | | - case Success(matched,_) => println(matched) |
46 | | - case Failure(msg,_) => println("FAILURE: " + msg) |
47 | | - case Error(msg,_) => println("ERROR: " + msg) |
48 | | - } |
| 41 | + def main(args: Array[String]) = { |
| 42 | + parse(freq, "johnny 121") match { |
| 43 | + case Success(matched,_) => println(matched) |
| 44 | + case Failure(msg,_) => println(s"FAILURE: $msg") |
| 45 | + case Error(msg,_) => println(s"ERROR: $msg") |
49 | 46 | } |
| 47 | + } |
50 | 48 | } |
51 | 49 | ``` |
52 | 50 |
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