edu.knowitall.openregex.example.PatternParsers.scala Maven / Gradle / Ivy

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package edu.knowitall.openregex.example

import scala.Array.canBuildFrom

import edu.knowitall.openregex.Pattern
import edu.washington.cs.knowitall.regex.Expression.BaseExpression

object PatternParsers {
  val singleQuoteStringLiteralRegex = ("'" + """([^']*+)""" + "'").r
  val regexLiteralRegex = ("/" + """((?:[^/\\]*+(?:\\)*+(?:\\/)*+)*+)""" + "/").r

  // build a pattern against the public members of a class
  def reflection[T] = {
    Pattern.parser[T] { (string: String) =>
      val Array(base, quotedValue) = string.split("=").map(_.trim)

      val compare = Common.unquote(quotedValue)

      (t: T) => {
        // see if we have a matching public field
        val fieldValue = Common.publicValue(t, base).toString
        compare(fieldValue)
      }
    }
  }

  // build a pattern against the public members of a class
  // allow logic expressions within the token
  def reflectionWithLogic[T] = {
    val logicParser = LogicParsers.reflection[T]
    Pattern.parser[T] { (tokenString: String) =>
      val logic = logicParser(tokenString)
      (t: T) => {
        logic(t)
      }
    }
  }
}