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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;

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

  private final CodeReader reader;

  private String attribute = "";
  private String value = "";
  private AttributeOperator operator = AttributeOperator.ATTRIBUTE;

  public AttributeSelectorParser(CodeReader reader) {
    this.reader = reader;
  }

  public AttributeSelector parse() {
    parseAttribute();
    parseValue();
    return new AttributeSelector(attribute, value, operator);
  }

  private void parseAttribute() {
    AttributeOperator[] operators = AttributeOperator.values();

    outer: while (reader.hasNext()) {
      reader.consume();
      for (AttributeOperator op : operators) {
        if (op.matches(reader)) {
          op.deleteKeyword(reader);
          attribute = reader.get();
          operator = op;
          break outer;
        }
      }
    }
  }

  private void parseValue() {
    if (operator.hasValue()) {
      parseValue0();
    }
  }

  private void parseValue0() {
    while (reader.hasNext()) {
      reader.consume();

      if (CssKeywords.stringDelimiter().matches(reader)) {
        reader.deleteKeyword(CssKeywords.stringDelimiter());
        value = reader.getUntil(CssKeywords.stringDelimiter());
        reader.deleteKeyword(CssKeywords.stringDelimiter());
        reader.skipOver(CssKeywords.attributeEnd());
        break;
      }

      if (CssKeywords.attributeEnd().matches(reader)) {
        reader.deleteKeyword(CssKeywords.attributeEnd());
        value = reader.get();
        break;
      }
    }
  }

}