晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @file Justify commands.
 */

(function()
{
	var alignRemoveRegex = /(-moz-|-webkit-|start|auto)/i;

	function getState( editor, path )
	{
		var firstBlock = path.block || path.blockLimit;

		if ( !firstBlock || firstBlock.getName() == 'body' )
			return CKEDITOR.TRISTATE_OFF;

		var currentAlign = firstBlock.getComputedStyle( 'text-align' ).replace( alignRemoveRegex, '' );
		if ( ( !currentAlign && this.isDefaultAlign ) || currentAlign == this.value )
			return CKEDITOR.TRISTATE_ON;
		return CKEDITOR.TRISTATE_OFF;
	}

	function onSelectionChange( evt )
	{
		var command = evt.editor.getCommand( this.name );
		command.state = getState.call( this, evt.editor, evt.data.path );
		command.fire( 'state' );
	}

	function justifyCommand( editor, name, value )
	{
		this.name = name;
		this.value = value;

		var contentDir = editor.config.contentsLangDirection;
		this.isDefaultAlign = ( value == 'left' && contentDir == 'ltr' ) ||
			( value == 'right' && contentDir == 'rtl' );

		var classes = editor.config.justifyClasses;
		if ( classes )
		{
			switch ( value )
			{
				case 'left' :
					this.cssClassName = classes[0];
					break;
				case 'center' :
					this.cssClassName = classes[1];
					break;
				case 'right' :
					this.cssClassName = classes[2];
					break;
				case 'justify' :
					this.cssClassName = classes[3];
					break;
			}

			this.cssClassRegex = new RegExp( '(?:^|\\s+)(?:' + classes.join( '|' ) + ')(?=$|\\s)' );
		}
	}

	justifyCommand.prototype = {
		exec : function( editor )
		{
			var selection = editor.getSelection(),
				enterMode = editor.config.enterMode;

			if ( !selection )
				return;

			var bookmarks = selection.createBookmarks(),
				ranges = selection.getRanges();


			var cssClassName = this.cssClassName,
				iterator,
				block;
			for ( var i = ranges.length - 1 ; i >= 0 ; i-- )
			{
				iterator = ranges[ i ].createIterator();
				iterator.enlargeBr = enterMode != CKEDITOR.ENTER_BR;

				while ( ( block = iterator.getNextParagraph() ) )
				{
					block.removeAttribute( 'align' );

					if ( cssClassName )
					{
						// Remove any of the alignment classes from the className.
						var className = block.$.className =
							CKEDITOR.tools.ltrim( block.$.className.replace( this.cssClassRegex, '' ) );

						// Append the desired class name.
						if ( this.state == CKEDITOR.TRISTATE_OFF && !this.isDefaultAlign )
							block.addClass( cssClassName );
						else if ( !className )
							block.removeAttribute( 'class' );
					}
					else
					{
						if ( this.state == CKEDITOR.TRISTATE_OFF && !this.isDefaultAlign )
							block.setStyle( 'text-align', this.value );
						else
							block.removeStyle( 'text-align' );
					}
				}

			}

			editor.focus();
			editor.forceNextSelectionCheck();
			selection.selectBookmarks( bookmarks );
		}
	};

	CKEDITOR.plugins.add( 'justify',
	{
		init : function( editor )
		{
			var left = new justifyCommand( editor, 'justifyleft', 'left' ),
				center = new justifyCommand( editor, 'justifycenter', 'center' ),
				right = new justifyCommand( editor, 'justifyright', 'right' ),
				justify = new justifyCommand( editor, 'justifyblock', 'justify' );

			editor.addCommand( 'justifyleft', left );
			editor.addCommand( 'justifycenter', center );
			editor.addCommand( 'justifyright', right );
			editor.addCommand( 'justifyblock', justify );

			editor.ui.addButton( 'JustifyLeft',
				{
					label : editor.lang.justify.left,
					command : 'justifyleft'
				} );
			editor.ui.addButton( 'JustifyCenter',
				{
					label : editor.lang.justify.center,
					command : 'justifycenter'
				} );
			editor.ui.addButton( 'JustifyRight',
				{
					label : editor.lang.justify.right,
					command : 'justifyright'
				} );
			editor.ui.addButton( 'JustifyBlock',
				{
					label : editor.lang.justify.block,
					command : 'justifyblock'
				} );

			editor.on( 'selectionChange', CKEDITOR.tools.bind( onSelectionChange, left ) );
			editor.on( 'selectionChange', CKEDITOR.tools.bind( onSelectionChange, right ) );
			editor.on( 'selectionChange', CKEDITOR.tools.bind( onSelectionChange, center ) );
			editor.on( 'selectionChange', CKEDITOR.tools.bind( onSelectionChange, justify ) );
		},

		requires : [ 'domiterator' ]
	});
})();

CKEDITOR.tools.extend( CKEDITOR.config,
	{
		justifyClasses : null
	} )