$this->last_query          = $query;
		$this->sought_tag_name     = null;
		$this->sought_class_name   = null;
		$this->sought_match_offset = 1;
		$this->stop_on_tag_closers = false;

		// A single string value means "find the tag of this name".
		if ( is_string( $query ) ) {
			$this->sought_tag_name = $query;
			return;
		}

		// An empty query parameter applies no restrictions on the search.
		if ( null === $query ) {
			return;
		}

		// If not using the string interface, an associative array is required.
		if ( ! is_array( $query ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The query argument must be an array or a tag name.' ),
				'6.2.0'
			);
			return;
		}

		if ( isset( $query['tag_name'] ) && is_string( $query['tag_name'] ) ) {
			$this->sought_tag_name = $query['tag_name'];
		}

		if ( isset( $query['class_name'] ) && is_string( $query['class_name'] ) ) {
			$this->sought_class_name = $query['class_name'];
		}

		if ( isset( $query['match_offset'] ) && is_int( $query['match_offset'] ) && 0 < $query['match_offset'] ) {
			$this->sought_match_offset = $query['match_offset'];
		}

		if ( isset( $query['tag_closers'] ) ) {
			$this->stop_on_tag_closers = 'visit' === $query['tag_closers'];
		}
	}


	/**
	 * Checks whether a given tag and its attributes match the search criteria.
	 *
	 * @since 6.2.0
	 *
	 * @return boolean Whether the given tag and its attribute match the search criteria.
	 */
	private function matches() {
		if ( $this->is_closing_tag && ! $this->stop_on_tag_closers ) {
			return false;
		}

		// Does the tag name match the requested tag name in a case-insensitive manner?
		if ( null !== $this->sought_tag_name ) {
			/*
			 * String (byte) length lookup is fast. If they aren't the
			 * same length then they can't be the same string values.
			 */
			if ( strlen( $this->sought_tag_name ) !== $this->tag_name_length ) {
				return false;
			}

			/*
			 * Check each character to determine if they are the same.
			 * Defer calls to `strtoupper()` to avoid them when possible.
			 * Calling `strcasecmp()` here tested slowed than comparing each
			 * character, so unless benchmarks show otherwise, it should
			 * not be used.
			 *
			 * It's expected that most of the time that this runs, a
			 * lower-case tag name will be supplied and the input will
			 * contain lower-case tag names, thus normally bypassing
			 * the case comparison code.
			 */
			for ( $i = 0; $i < $this->tag_name_length; $i++ ) {
				$html_char = $this->html[ $this->tag_name_starts_at + $i ];
				$tag_char  = $this->sought_tag_name[ $i ];

				if ( $html_char !== $tag_char && strtoupper( $html_char ) !== $tag_char ) {
					return false;
				}
			}
		}

		$needs_class_name = null !== $this->sought_class_name;

		if ( $needs_class_name && ! isset( $this->attributes['class'] ) ) {
			return false;
		}

		/*
		 * Match byte-for-byte (case-sensitive and encoding-form-sensitive) on the class name.
		 *
		 * This will overlook certain classes that exist in other lexical variations
		 * than was supplied to the search query, but requires more complicated searching.
		 */
		if ( $needs_class_name ) {
			$class_start = $this->attributes['class']->value_starts_at;
			$class_end   = $class_start + $this->attributes['class']->value_length;
			$class_at    = $class_start;

			/*
			 * Ensure that boundaries surround the class name to avoid matching on
			 * substrings of a longer name. For example, the sequence "not-odd"
			 * should not match for the class "odd" even though "odd" is found
			 * within the class attribute text.
			 *
			 * See https://html.spec.whatwg.org/#attributes-3
			 * See https://html.spec.whatwg.org/#space-separated-tokens
			 */
			while (
				// phpcs:ignore WordPress.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
				false !== ( $class_at = strpos( $this->html, $this->sought_class_name, $class_at ) ) &&
				$class_at < $class_end
			) {
				/*
				 * Verify this class starts at a boundary.
				 */
				if ( $class_at > $class_start ) {
					$character = $this->html[ $class_at - 1 ];

					if ( ' ' !== $character && "\t" !== $character && "\f" !== $character && "\r" !== $character && "\n" !== $character ) {
						$class_at += strlen( $this->sought_class_name );
						continue;
					}
				}

				/*
				 * Verify this class ends at a boundary as well.
				 */
				if ( $class_at + strlen( $this->sought_class_name ) < $class_end ) {
					$character = $this->html[ $class_at + strlen( $this->sought_class_name ) ];

					if ( ' ' !== $character && "\t" !== $character && "\f" !== $character && "\r" !== $character && "\n" !== $character ) {
						$class_at += strlen( $this->sought_class_name );
						continue;
					}
				}

				return true;
			}

			return false;
		}

		return true;
	}
}