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Asked: 2026-06-19T00:44:01+00:00

I’d like to get position information using the positional parser and Positional trait. I’d

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I’d like to get position information using the positional parser and Positional trait. I’d like to read the file Im parsing into a string (or something I can convert to a string) and then parse it while retaining the position information. Here’s what I’ve found on ‘positional’:

https://wiki.scala-lang.org/display/SW/Parsing

…which off-handedly mentions StreamReader and CharArrayReader. Are there other options? Reading my file into something that can be used with a CharArrayReader may be what I need. If so, how does that work? If not, what should I be doing?

(FYI, StreamReader is out because I want to read and keep the file long before I parse it, not because I want to waste memory.)

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1 Answer

  1. Editorial Team

    Direct your favorite browser to the ScalaDoc HTML and navigate to the package scala.util.parsing.input where you’ll find the available positioned readers:

    • CharArrayReader
    • CharSequenceReader
    • PagedSeqReader
    • StreamReader

    Addendum

    Creating one of these readers, CharArrayReader, e.g., is simple:

    val car = new CharArrayReader("sample input")

    Now you have the Reader to feed your parser.

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