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Deterministic Regular Expression Engine

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package dregex

import dregex.impl.Compiler
import dregex.impl.Dfa
import dregex.impl.RegexTree
import dregex.impl.SimpleState

/**
  * A fully-compiled regular expression that was generated from a string literal.
  */
/*
 * Private parameters used to work around Scaladoc limitation for val's in private
 * constructors.
 */
class CompiledRegex private[dregex] (
    _originalString: String,
    parsedTree: RegexTree.Node,
    val universe: Universe
) extends Regex {

  /**
    * The original regex string, before parsing.
    */
  val originalString: String = _originalString

  private[dregex] val dfa: Dfa[SimpleState] = {
    new Compiler(universe.alphabet).fromTree(parsedTree)
  }

  override def toString = s"⟪$originalString⟫ (DFA states: ${dfa.stateCount})"

}