com.github.kardapoltsev.astparser.parser.BaseLexer.scala Maven / Gradle / Ivy

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ast-parser

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/*
 * Copyright 2016 Alexey Kardapoltsev
 *
 * 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 com.github.kardapoltsev.astparser.parser

import java.awt.event.KeyEvent

import scala.collection.mutable.ListBuffer
import scala.util.parsing.combinator.Parsers
import scala.util.parsing.combinator.lexical.Scanners
import scala.util.parsing.input.{CharSequenceReader, Reader}

abstract class BaseLexer extends Scanners with Parsers {

  def scan(input: Reader[Char]): List[Token] = {
    var r   = new Scanner(input)
    val buf = ListBuffer[Token]()
    while (!r.atEnd) {
      buf += r.first
      r = r.rest
    }
    buf.toList
  }

  def scan(input: CharSequence): List[Token] = scan(new CharSequenceReader(input))

  protected def isPrintableChar(c: Char): Boolean = {
    val block = Character.UnicodeBlock.of(c)
    (!Character.isISOControl(c)) &&
    c != KeyEvent.CHAR_UNDEFINED &&
    block != null &&
    block != Character.UnicodeBlock.SPECIALS
  }

}