////////////////////////
//File  : cocolog_ajax_search.js
//site  : http://java.cocolog-nifty.com/
//author: naoyuki
//year  : 2006
//この作品は、クリエイティブ・コモンズの帰属-同一条件許諾 2.1 日本ライセンスの下でライセンスされています。この使用許諾条件を見るには、http://creativecommons.org/licenses/by-sa/2.1/jp/をチェックするか、クリエイティブ･コモンズに郵便にてお問い合わせください。住所は：559 Nathan Abbott Way, Stanford, California 94305, USA です。
////////////////////////

var page_counter = 0;
var backnumber_url_list;
var entries = new Array();
var search_keyword;
var result_content;
var search_counter;
var result_data;
var is_lookahead = true;

//document.write('<img src="http://weblog.news.coocan.jp/projects/etc/cocolog_ajax_search_users_log.cgi?u=' + encodeURIComponent(location.href) + '" width="1" height="1" alt="" />');

load_center_id();
set_lookahead_action();

function load_center_id() {
    var center = document.getElementById( 'center' );
    if ( center ) {
        ligting_search_keyword( center );
    } else {
        window.setTimeout( 'load_center_id()', 100 );
    }
}

function set_lookahead_action() {
	var search_box = document.getElementById('search_box');
	try {
                search_box.onfocus = function () {
			setTimeout("lookahead_backnumbers();", 100);
		}
	} catch(e) {
		setTimeout("set_lookahead_action();", 100 );
	}
}

function ligting_search_keyword( center ) {
    var args = getHashArgs();
    var searched_keyword = args.search_word;
    if ( searched_keyword ) {
        searched_keyword = searched_keyword.replace( /([\/\\\.\*\+\?\|\(\)\[\]\{\}\$\^])/g, "\\$1" );
        searched_keyword = searched_keyword.replace( /( +|　+)/, ' ' );
        searched_keyword = searched_keyword.replace( /( |　)$/, '' );
        var keywords = searched_keyword.split(/ |　/);
        var h3 = center.getElementsByTagName( 'h3' );
        h3[0].innerHTML = highlight( h3[0].innerHTML, keywords );
        var div = center.getElementsByTagName( 'div' );
        for ( var i = 0; i < div.length; i++ ) {
            if ( div[i].className == 'entry-body-text' ) {
		replace_text_only(div[i], keywords);
	    }
	}
    }
}

function getHashArgs () {
    var args = new Object();
    var query = location.href.replace(/.*?#/,"");
   query = decodeURIComponent( query );
    var pairs = query.split("&");
    for ( var i = 0; i < pairs.length; i++ ) {
        var pos = pairs[i].indexOf('=');
        if ( pos == -1 ) continue;
        var argname = pairs[i].substring( 0, pos );
        var value = pairs[i].substring( pos + 1 );
        args[argname] = value;
    }
    return args;
}

function lookahead_backnumbers() {
	if(is_lookahead) {
		is_lookahead = false;
		search_keyword = '';
		search_counter = 0;
		var archive_file_path = getArchiveFilePath();
		var div_tag = document.getElementsByTagName('div');
		for ( var i = 0; i < div_tag.length; i ++ ) {
			if ( div_tag[i].className == 'content' ) {
				result_content = div_tag[i];
			}
		}
		new Ajax.Request( archive_file_path, {method: 'get', onComplete: function(request){ parse_backnumbers( request ); } } );
	}
}

function cocologAjaxSearch( archive_file_path, text ) {
    search_keyword = text;
    search_counter = 0;
    result_data = new Array();
//    search_keyword = search_keyword.replace( /([\/\\\.\*\+\?\|\(\)\[\]\{\}\$\^])/g, "\\$1" );
    search_keyword = search_keyword.replace( /( +|　+)/, ' ' );
    search_keyword = search_keyword.replace( /( |　)$/, '' );
    window.scroll(0,0);
    var div_tag = document.getElementsByTagName('div');
    for ( var i = 0; i < div_tag.length; i ++ ) {
        if ( div_tag[i].className == 'content' ) {
            result_content = div_tag[i];
        }
    }
    new Ajax.Request( getArchiveFilePath(), {method: 'get', onComplete: function(request){ parse_backnumbers( request ); } } );
}

function parse_backnumbers( request, text ) {
    var backnumber_page = request.responseText;
    backnumber_page = backnumber_page.replace( new RegExp( '\n', "g"), '' );
    backnumber_page = backnumber_page.replace( new RegExp( '\r', "g"), '' );
    backnumber_page = backnumber_page.replace( new RegExp( '.*(<div class="archive-datebased">.*?<div class="archive-category">).*', "i"), "$1" );
    backnumber_url_list = backnumber_page.match(/http:\/\/.*?html/ig);
    load_backnumber( text );
}

function load_backnumber() {
    if( page_counter > backnumber_url_list.length - 1 ) {
        search();
    } else {
        new Ajax.Request( backnumber_url_list[ page_counter ], {method: 'get', onComplete: function(request){ parse_enteries_page( request ); } } );
    }
}

function parse_enteries_page( request ) {
    var entries_page = request.responseText;
    entries_page = entries_page.replace( new RegExp( '\n', "g"), '' );
    entries_page = entries_page.replace( new RegExp( '\r', "g"), '' );
    entry_list = entries_page.match(/<div class="entry">.*?<\/div><div class="entry-bottom"><\/div>/ig);
    for ( var i = 0; i < entry_list.length; i++ ) {
        entry_list[i].match(/.*<h3>(.*?)<\/h3>.*<div class="entry-body-text">(.*?)<div class="entry-body-bottom"><\/div>.*<a class="permalink" href="(.*?)">.*/i);
        var title = RegExp.$1;
        var body = RegExp.$2;
        var link = RegExp.$3;
        body = body.replace( new RegExp( '<.*?>', 'ig'), '' );
        title = title.replace( new RegExp( '<.*?>', 'ig'), '' );
        entries[ entries.length ] = {title:title, body:body, link:link};
    }
    search();
    page_counter++;
    load_backnumber();
}

function show_all_backnumbers() {
    var text = '<ol type=1 start=1 style="text-align:left;">';
    for ( var i = 0; i < entries.length; i++ ) {
        text += '<li><a href="' + entries[i].link + '">' +entries[i].title + '</a</li>';
    }
    text += '</ol>';
    document.getElementById('center').innerHTML = text;
}

function search() {
    if ( search_keyword == '' ) {
    } else {
    var keywords = search_keyword.split(/ |　/);
    for ( var i=search_counter; i<entries.length; i++ ) {
        var is_match = true;
        for ( var j= 0; j<keywords.length; j++ ) {
            var body_index = entries[i].body.toLowerCase().indexOf( keywords[j].toLowerCase() );
            var title_index = entries[i].title.toLowerCase().indexOf( keywords[j].toLowerCase() );
            if ( body_index == -1 && title_index == -1 ) {
                is_match = false;
            }
        }
        if ( is_match ) {
            result_data[ result_data.length ] = entries[i];
        }
        search_counter++;
    }
    var result_html = '';
    if ( result_data.length == 0 ) {
	if ( page_counter > backnumber_url_list.length - 1 ) {
        	result_html =  '一致しませんでした';
	} else {
		result_content.innerHTML = '検索中... ' + Math.floor( ( page_counter * 100 )  / backnumber_url_list.length )  + '%';
		return;
	}
    } else {
        if ( page_counter > backnumber_url_list.length - 1 ) {
        	result_html = build_search_result_html( result_data, keywords, '検索結果' );
	} else {
                result_html = build_search_result_html( result_data, keywords, '検索中...' + Math.floor( ( page_counter * 100 )  / backnumber_url_list.length ) + '%' );
	}
    }
    var div = window.document.getElementsByTagName('div');
    result_content.innerHTML = result_html;
  }
}

function build_search_result_html( result_data, keywords, notice ) {
    var html = '<div id="search_notice"  style="text-align:left; font-size: x-small;">※スペースでAND検索が出来ます。<br />※この状態からの２度目の検索は非常に高速です。</div><div class="entry-top"></div><div class="entry"><h3>' + notice + '（' + result_data.length + '件ヒット ）</h3><div class="entry-body-top"></div><div class="entry-body"><div class="entry-body-text"><ol type=1 start=1 style="text-align:left;">';
    for ( var i= 0; i<result_data.length; i++ ) {
    	html += '<li><a href="' + result_data[i].link + '#search_word=' + search_keyword + '" target="_blank">' + highlight( result_data[i].title, keywords ) + '</a><br />' + highlight( trunc( result_data[i].body, keywords[0] ), keywords ) + '</li>';
    }
    html += '</ol></div></div><div class="entry-body-bottom"></div><p class="posted" style="text-align:right; font-size: smaller;"><span class="post-footers"></span><span class="separator"></span><span class="bo_so_copyright">powered by <a href="http://java.cocolog-nifty.com/blog/2005/10/javascript_c163.html">cocolog_ajax_search.js</a></span></p></div><div class="entry-bottom"></div><div class="date-footer"></div>';
    return html;
}

function trunc( text, keyword ) {
    var key = new RegExp( keyword, "i" );
    var res = key.exec( text );

    if ( res ) {
    	var index  = res.index;
    	var length = res[0].length;
    	var start;
    	var end;

    	start = index - 20;
    	end = 55;
    	text = text.substring( start, index ) + text.substr( index, length ) + text.substr( index + length, end ) +'...';
    } else {
        text = text.substring( start, 50 );
    }
    return text;
}

function highlight( text, keywords ) {
    var keyword = '';
    for ( var i= 0; i<keywords.length; i++ ) {
        if ( i == keywords.length - 1 ) {
            keyword += encodeURIComponent(keywords[i]);
        } else {
            keyword += encodeURIComponent(keywords[i]) + '|'; 
        }
    }
    replaced_text = encodeURIComponent(text).replace( new RegExp( '(' + keyword + ')', "ig"), '<span style="background-color: #FFCC33;">' + "$1" + '</span>' );
    return decodeURIComponent(replaced_text);
}

function replace_text_only(node_target, keywords) {
    var keyword = '';
    for ( var i= 0; i<keywords.length; i++ ) {
        if ( i == keywords.length - 1 ) {
            keyword += encodeURIComponent(keywords[i]);
        } else {
            keyword += encodeURIComponent(keywords[i]) + '|'; 
        }
    }
    var nodes = getTextNodes(node_target);
    var reg = new RegExp(keyword, "i");
    var node;
    var text;
    for(var i=0; i<nodes.length; i++) {
	node = nodes[i];
	text = node.nodeValue;
	text = encodeURIComponent(text);
	if(text.match(reg)) {
	    while(text.match(reg)) {
		var res = text.match(reg);
		//		node.parentNode.insertBefore(node.ownerDocument.createTextNode(decodeURIComponent(RegExp.leftContext)), node);
		node.parentNode.insertBefore(node.ownerDocument.createTextNode(decodeURIComponent( text.substring(0, res.index))), node);
		var span = node.ownerDocument.createElement("span");
		span.style.backgroundColor = "#FFCC33";
		//		node.parentNode.insertBefore(span, node).appendChild(node.ownerDocument.createTextNode(decodeURIComponent(RegExp.lastMatch)));
		node.parentNode.insertBefore(span, node).appendChild(node.ownerDocument.createTextNode(decodeURIComponent(res[0])));
		//		text = RegExp.rightContext;
		text = text.substring(res.index + res[0].length, text.length);
	    }
	    node.parentNode.insertBefore(node.ownerDocument.createTextNode(decodeURIComponent(text)), node);
	    node.parentNode.removeChild(node);
	}
    }
}

function getTextNodes(node) {
    function setTextNodes(node, list_text) {
	if(node.nodeType == null)
	    return;	
	switch(node.nodeType) {
	case 3:
	    list_text.push(node);					
	    break;
	case 1:
	case 9:
	    var nodes = node.childNodes;
	    for(var i=0; i<nodes.length; i++)
		setTextNodes(nodes[i], list_text);
	    break;
	default:
	    break;
	}
    }
    var list_text = new Array();
    setTextNodes(node, list_text);
    return list_text;
}

function getArchiveFilePath() {
	return document.getElementsByTagName('h1')[0].getElementsByTagName('a')[0].href + 'archives.html';
}