Magnolia fastparse

[aborg0]

Examples

Same content with FastParse (FastParseMagnoliaParseCaseClass)

Intro

There might be multiple implementations of ParseCaseClass, currently only RegexParseCaseClass and FastParseParseCaseClass are supported, but only one should be used in a scope (in this case FastParseParseCaseClass):

import com.github.aborg0.caseyclassy.FastParseMagnoliaParseCaseClass
import com.github.aborg0.caseyclassy.FastParseMagnoliaParseCaseClass._
import java.time.{LocalDate, LocalTime}

It is possible to parse simple values, like Boolean, Byte, Short, Int, Long, Float, Double, LocalTime, LocalDate and Strings without comma (,) or closing parenthesis ()), but this library was designed to parse toString of algebraic data types (products -case classes, tuples- and coproducts) of them. Also some Seqs (List, Vector, WrappedArray (for varargs)) are supported.

Simple primitives

LocalDate:

scala> val date: LocalDate = FastParseMagnoliaParseCaseClass.to[LocalDate]("2018-04-01")
date: java.time.LocalDate = 2018-04-01

or it is also possible to create a parser and reuse it:

scala> val dateParser = FastParseMagnoliaParseCaseClass[LocalDate]
dateParser: com.github.aborg0.caseyclassy.FastParseParse[java.time.LocalDate] = com.github.aborg0.caseyclassy.FastParseMagnoliaParseCaseClass$$anonfun$dateParse$4@7436564e

scala> dateParser.parse("2018-04-01")
res0: java.time.LocalDate = 2018-04-01

scala> dateParser.parse("2018-04-22")
res1: java.time.LocalDate = 2018-04-22

Tuple2 of String and Int:

scala> FastParseMagnoliaParseCaseClass.to[(String, Int)]("(   hello,4)")
res2: (String, Int) = ("   hello",4)

Or in the other order:

scala> val (i, s) = FastParseMagnoliaParseCaseClass.to[(Int, String)]("(4,   hello)")
i: Int = 4
s: String = "   hello"

The error messages are not very good:

scala> val dateTuple1 = FastParseMagnoliaParseCaseClass.to[Tuple1[LocalDate]]("2018-04-01")
java.lang.IllegalArgumentException: Expected: "(" at position: 0
  at com.github.aborg0.caseyclassy.FastParseParse.$anonfun$parse$1(FastParseMagnoliaParseCaseClass.scala:129)
  at com.github.aborg0.caseyclassy.FastParseParse.$anonfun$parse$1$adapted(FastParseMagnoliaParseCaseClass.scala:128)
  at fastparse.core.Parsed.fold(Parsing.scala:40)
  at fastparse.core.Parsed.fold$(Parsing.scala:38)
  at fastparse.core.Parsed$Failure.fold(Parsing.scala:74)
  at com.github.aborg0.caseyclassy.FastParseParse.parse(FastParseMagnoliaParseCaseClass.scala:129)
  at com.github.aborg0.caseyclassy.FastParseParse.parse$(FastParseMagnoliaParseCaseClass.scala:128)
  at com.github.aborg0.caseyclassy.FastParseMagnoliaParseCaseClass$$anonfun$combine$9.parse(FastParseMagnoliaParseCaseClass.scala:62)
  at com.github.aborg0.caseyclassy.FastParseMagnoliaParseCaseClass$.to(FastParseMagnoliaParseCaseClass.scala:95)
  ... 42 elided

Algebraic data types

With help of shapeless the following constructs are supported:

• case classes
• case objects
• sealed hierarchies
• tuples
• a few Seq types

Case classes

scala> case class Example(a: Int, s: String)
defined class Example

scala> FastParseMagnoliaParseCaseClass.to[Example]("Example(-3, Hello)")
res3: Example = Example(-3, Hello)

scala> case object Dot
defined object Dot

scala> FastParseMagnoliaParseCaseClass.to[Dot.type]("Dot")
res4: Dot.type = Dot

Sealed hierarchies

Either

scala> FastParseMagnoliaParseCaseClass.to[Either[Short, Boolean]]("Left(-1111)")
res5: Either[Short,Boolean] = Left(-1111)

scala> FastParseMagnoliaParseCaseClass.to[Either[Short, Boolean]]("Right(false)")
res6: Either[Short,Boolean] = Right(false)

Option

scala> FastParseMagnoliaParseCaseClass.to[Option[Option[Int]]]("Some(None)")
res7: Option[Option[Int]] = Some(None)

scala> FastParseMagnoliaParseCaseClass.to[Option[Option[Int]]]("None")
res8: Option[Option[Int]] = None

scala> FastParseMagnoliaParseCaseClass.to[Option[Either[String, Seq[Boolean]]]]("Some(Right(List()))")
res9: Option[Either[String,Seq[Boolean]]] = Some(Right(ArrayBuffer()))

scala> FastParseMagnoliaParseCaseClass.to[Option[Either[String, Seq[Boolean]]]]("Some(Right(List(false, true)))")
res10: Option[Either[String,Seq[Boolean]]] = Some(Right(ArrayBuffer(false, true)))