<?php
/**
 * The string parser collects all string character tokens until a string end token is found.
 *
 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
 * @copyright Copyright 2010-2014 PhpCss Team
 */

namespace PhpCss\Parser {

  use PhpCss;
  use PhpCss\Scanner;

  /**
   * The string parser collects all string character tokens until a string end token is found.
   */
  class Text extends PhpCss\Parser {

    /**
     * @throws PhpCss\Exception\ParserException
     */
    public function parse(): PhpCss\Ast\Node {
      $string = '';
      while (TRUE) {
        $token = $this->read(
          [
            Scanner\Token::STRING_CHARACTERS,
            Scanner\Token::STRING_ESCAPED_CHARACTER,
            Scanner\Token::SINGLEQUOTE_STRING_END,
            Scanner\Token::DOUBLEQUOTE_STRING_END,
          ]
        );
        switch ($token->type) {
        case Scanner\Token::STRING_CHARACTERS :
          $string .= $token->content;
          break;
        case Scanner\Token::STRING_ESCAPED_CHARACTER :
          $string .= substr($token->content, 1);
          break;
        case Scanner\Token::SINGLEQUOTE_STRING_END :
        case Scanner\Token::DOUBLEQUOTE_STRING_END :
          return new PhpCss\Ast\Value\Literal($string);
        }
      }
    }
  }
}