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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.css.io;

import br.com.objectos.codereader.CodeReader;
import br.com.objectos.codereader.Keyword;
import br.com.objectos.codereader.OptionalChar;

/**
 * @author [email protected] (Marcio Endo)
 */
class CssKeywords {

  private static final Keyword ATTR_END = Keyword.of(']');

  private CssKeywords() {
  }

  public static Keyword attributeEnd() {
    return ATTR_END;
  }

  public static Keyword identifierChar() {
    return IdentifierCharKeyword.INSTANCE;
  }

  public static Keyword stringDelimiter() {
    return StringDelimiterKeyword.INSTANCE;
  }

  private enum IdentifierCharKeyword implements Keyword {

    INSTANCE;

    @Override
    public boolean matches(CodeReader reader) {
      if (reader.empty()) {
        return false;
      }

      return test(reader.last());
    }

    @Override
    public boolean peek(CodeReader reader) {
      OptionalChar peek = reader.peek();
      return peek.isPresent()
          ? test(peek.getAsChar())
          : test(reader.last());
    }

    @Override
    public int size() {
      return 1;
    }

    private boolean test(char theChar) {
      return Character.isLetterOrDigit(theChar) || theChar == '_' || theChar == '-';
    }

  }

  private enum StringDelimiterKeyword implements Keyword {

    INSTANCE;

    @Override
    public boolean matches(CodeReader reader) {
      if (reader.empty()) {
        return false;
      }
      return test(reader.last());
    }

    @Override
    public int size() {
      return 1;
    }

    private boolean test(char theChar) {
      return theChar == '\'' || theChar == '"';
    }

  }

}