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/**
 * Copyright (C) 2009-2011 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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.fusesource.scalate

import scala.util.parsing.input.Positional
import ssp.SspParser

/**
 * Describes a variable binding that a Scalate template defines.
 *
 * @author Hiram Chirino
 */
case class Binding(
        name: String,
        className: String = "Any",
        importMembers: Boolean = false,
        defaultValue: Option[String] = None,
        kind: String = "val",
        isImplicit: Boolean = false,
        classNamePositional: Option[Positional] = None,
        defaultValuePositional: Option[Positional] = None) {
  
  def classNamePositionalOrText: String = classNamePositional match {
    case Some(positional) => positional.toString
    case _ => className
  }

  def defaultValuePositionalOrText: String = defaultValuePositional match {
    case Some(positional) => positional.toString
    case _ => defaultValue.get
  }
}

object Binding {

  def apply(expr:String):Binding = {
    val a = (new SspParser).getAttribute(expr)
    Binding(a.name.value, a.className.value, a.autoImport, a.defaultValue.map(_.value), a.kind.value, false)
  }

  def of[T](
          name: String,
          importMembers: Boolean = false,
          defaultValue: Option[String] = None,
          kind: String = "val",
          isImplicit: Boolean = false)(implicit m: Manifest[T]) =
    new Binding(name, m.erasure.getName, importMembers, defaultValue, kind, isImplicit)
}