How do you set maxValueStackSize?

[Robert Kreuzer]

Hi there,

I am getting a org.parboiled2.ValueStackOverflowException for a larger input. I am trying to work around it by increasing the maxValueStackSize, but I cannot figure out where to set it.

I have a Parser

class JobParser(val input: ParserInput) extends Parser with ExpressionParser {...}

and I am using it like this:

val parsedJob = parser.job.run(maxValueStackSize = 2048)

But setting maxValueStackSize here does not compile. Where should I set it instead?

Thanks,
Robert

[Alexander Myltsev]

Hi Robert, 

Could you paste your compilation error here? 

A.

[Robert Kreuzer]

Hi Alexander,

the error I am getting is:

too many arguments for macro method run: ()(implicit scheme: org.parboiled2.Parser.DeliveryScheme[shapeless.::[com.blabla.Job,shapeless.HNil]])scheme.Result

Also the type of 'parser.job' is Rule1[Job], if that helps.

Best,
Robert

[Alexander Myltsev]

Try this:

parser.job.run("someInput", maxValueStackSize = 2048)

[Robert Kreuzer]

That gives the same error as above, when I try it.
But I am already passing the input to the parser, when constructing it:

        val parser = new JobParser(job)
        val parsedJob = parser.job.run()

This code is working, but for very large inputs it throws the ValueStackOverflowException.
Can I maybe set the maxValueStackSize as an attribute on the JobParser itself somehow?

Best,
Robert

[Mathias Doenitz]

Robert,

`maxValueStackSize` is a constructor parameter of the `Parser` class.

So, if you currently have

class JobParser(val input: ParserInput) extends Parser {
...
}

you should change it to

class JobParser(val input: ParserInput) extends Parser(maxValueStackSize = 16384) {
...
}

HTH and cheers,
Mathias

---
mat...@parboiled.org
http://www.parboiled.org

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[Robert Kreuzer]

Mathias,

thanks for your help, that did the trick!
I didn't realize that you can pass arguments to classes that you are inheriting from in Scala.

Best,
Robert

[Alexander Myltsev]

Example as follows worked out for me:

object ABCParser extends App {

  object Parser extends SimpleParser {

    val InputLine = rule { &(A ~ 'c') ~ oneOrMore('a') ~ B ~ !(ch('a') | 'b' | 'c') ~ EOI }

    val A: Rule0 = rule { 'a' ~ optional(A) ~ 'b' }

    val B: Rule0 = rule { 'b' ~ optional(B) ~ 'c' }

  }

  repl()

  @tailrec

  def repl(): Unit =

    StdIn.readLine("---\nEnter expression for abc-parser > ") match {

      case "" ⇒ // terminate

      case line ⇒

        Parser.InputLine.run(line, maxValueStackSize = 2048) match {

          case Success(_)             ⇒ println("Expression is valid")

          case Failure(e: ParseError) ⇒ println("Expression is not valid: " + e.format(line))

          case Failure(e)             ⇒ println("Unexpected error during parsing run: " + e)

        }

        repl()

    }

}

[Alexander Myltsev]

BTW what version of parboiled do you use? May be you should upgrade it.

[Robert Kreuzer]

Hi Alexander,

I'm using parboiled 2.1.0 (so the latest version, I think).
And I'm importing 'import org.parboiled2._'.
I'm not sure why passing maxValueStackSize to run() doesn't work for me, but I could get it to work by passing it directly to the Parser constructor, as suggested by Mathias.
Thanks for looking into this, I appreciate it.

Robert