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XPath parser and XPath AST API

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/*
 * Copyright 2011-2017 Chris de Vreeze
 *
 * 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 eu.cdevreeze.xpathparser.parse

import eu.cdevreeze.xpathparser.ast.AnyWildcard
import eu.cdevreeze.xpathparser.ast.LocalNameWildcard
import eu.cdevreeze.xpathparser.ast.NamespaceWildcard
import eu.cdevreeze.xpathparser.ast.PrefixWildcard
import eu.cdevreeze.xpathparser.ast.Wildcard

/**
 * Wildcard parsing support. No whitespace skipping is performed. See ws:explicit constraint.
 *
 * For re-usability without imposing any NoCut calls on using parsers, no cuts have been used.
 *
 * @author Chris de Vreeze
 */
object Wildcards {
  import fastparse.all._

  private val DT = DelimitingTerminals

  // Mind the order of parsing, trying to match AnyWildcard only at the end

  val wildcard: P[Wildcard] =
    P(prefixWildcard | localNameWildcard | namespaceWildcard | anyWildcard)

  val prefixWildcard: P[PrefixWildcard] =
    P(NCNames.ncName ~ DT.colonAsterisk) map {
      nm => PrefixWildcard(nm)
    }

  val localNameWildcard: P[LocalNameWildcard] =
    P(DT.asteriskColon ~ NCNames.ncName) map {
      nm => LocalNameWildcard(nm)
    }

  val namespaceWildcard: P[NamespaceWildcard] =
    P(DT.bracedUriLiteral ~ DT.asterisk) map {
      uriLit => NamespaceWildcard(uriLit)
    }

  val anyWildcard: P[AnyWildcard.type] =
    P(DT.asterisk) map (_ => AnyWildcard)
}