org.parboiled.scala.rules.CharRule.scala Maven / Gradle / Ivy

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Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful

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/*
 * Copyright (C) 2009-2011 Mathias Doenitz
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.parboiled.scala.rules

import org.parboiled.matchers._
import org.parboiled.common.StringUtils.escape
import java.lang.String

/**
 * A rule matching one single character.
 */
class CharRule(val c: Char) extends Rule0(new CharMatcher(c).label(s"'${escape(c)}'")) {

  /**
   * Creates a rule matching the range of characters between the character of this rule and the given character
   * (inclusively).
   */
  override def -(upperBound: String) = {
    require(upperBound != null && upperBound.length == 1)
    new Rule0(new CharRangeMatcher(c, upperBound.charAt(0)).label(s"${c}..${upperBound}"))
  }

}