Parser for Opera's native bookmarks.adr format.

class-opera-bookmarks-parser.php

<?php

/**
 * Parse Opera's bookmarks.adr file.
 */
class Opera_Bookmarks_Parser {

	/** @var string path to bookmarks.adr */
	public $adr;

	/** @var array */
	public $bookmarks = array();

	/** @var array folder levels  */
	public $folder = array();

	/** @var array current bookmarks  */
	public $bookmark = array();

	/** @var string type of current section */
	public $mode = '';

	/** @var array reference to current place in $bookmarks */
	public $target;

	/**
	 * @param string $file_path
	 */
	function __construct( $file_path ) {

		$this->adr = $file_path;
		$this->parse();
	}

	/**
	 * Open and parse file
	 */
	function parse() {

		$this->set_target();

		$handle = fopen( $this->adr, 'r' );

		while ( ( $line = fgets( $handle, 4096 ) ) !== false ) {

			$line     = trim( $line );
			$line_key = substr( $line, 0, 1 );

			if ( '#' === $line_key ) { // new item start

				$this->mode = substr( $line, 1 );
			}
			elseif ( '-' === $line_key ) { // folder level closes

				$this->pop_folder();
			}
			elseif ( 'URL' === $this->mode ) { // parsing URL

				if ( empty( $line ) ) { // URL block over

					$this->push_bookmark();
				}
				elseif ( false !== strpos( $line, '=' ) ) { // line with data

					list( $field, $value ) = explode( '=', $line, 2 );
					$this->bookmark[$field] = $value;
				}
			}
			elseif ( 'FOLDER' === $this->mode && 'NAME=' === substr( $line, 0, 5 ) ) { // parsing folder
				$this->push_folder( substr( $line, 5 ) );
			}
		}

		fclose( $handle );
	}

	/**
	 * Push gathered bookmark data to results.
	 */
	function push_bookmark() {

		if ( empty( $this->bookmark ) )
			return;

		if ( 0 === strpos( $this->bookmark['URL'], 'javascript' ) ) { // skip bookmarklets
			$this->bookmark = array();
			return;
		}

		if ( empty( $this->bookmark['VISITED'] ) )
			$this->bookmark['VISITED'] = $this->bookmark['CREATED'];

		$this->target[] = $this->bookmark;
		$this->bookmark = array();
	}

	/**
	 * Add a folder level and adjust target for bookmarks in results.
	 *
	 * @param string $folder
	 */
	function push_folder( $folder ) {

		$this->folder[] = $folder;
		$this->set_target();
	}

	/**
	 * Pop deepest folder level and adjust target for bookmarks in results.
	 */
	function pop_folder() {

		array_pop( $this->folder );
		$this->set_target();
	}

	/**
	 * Set point in results array where bookmarks are pushed to.
	 */
	function set_target() {

		$this->target =& $this->bookmarks;

		foreach ( $this->folder as $level ) {

			$this->target =& $this->target[$level];
		}
	}
}