always_search_options.user.js

// ==UserScript==
// @name           always search options
// @namespace      http://entrance.cjb.net
// @description    enables search options of target time range and languages
// @include        http://www.google.com/*
// @include        http://www.google.co.jp/*
// ==/UserScript==

(function(){

    function create_element(html_string) {
        var div_elem = document.createElement('div');
        div_elem.innerHTML = html_string;
        return div_elem.firstChild;
    }

    // insert element after node
    function insert_after(element, node) {
        node.parentNode.insertBefore(element, node.nextSibling);
    }

    // insert element before node
    function insert_before(element, node) {
        node.parentNode.insertBefore(element, node);
    }

    var fsearch_node_res = document.evaluate('//form[@action="/search"]', document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
    if (fsearch_node_res.snapshotLength <= 0) {
        return;
    }

    var fsearch_node = fsearch_node_res.snapshotItem(0);

    function xpath_ordered(query) {
        return document.evaluate(query, fsearch_node, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    }

    function xpath(query) {
        return document.evaluate(query, fsearch_node, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
    }

    var qdr_res = xpath('//select[@name="as_qdr"]');
    if (qdr_res.snapshotLength == 0) {
        // E4X here document
        var select_time_elem =
            create_element(<><span style="text-align: left; font-size: small;"><input
                           type="radio" name="as_qdr" value="all" /><label>anytime</label><input
                           type="radio" name="as_qdr" value="y" /><label>year</label><input
                           type="radio" name="as_qdr" value="m" /><label>month</label><input
                           type="radio" name="as_qdr" value="w" /><label>week</label><input
                           type="radio" name="as_qdr" value="d" /><label>24h</label></span></>);
        //var elements = new Array(10);
        //for (var i = 0; i < 5; i++) {
        //  elements[i*2] = document.createElement('input');
        //  elements[i*2].name = 'as_qdr';
        //  elements[i*2].type = 'radio';
        //  elements[i*2 + 1] = document.createElement('label');
        //}
        //elements[0].value = 'all';
        //elements[1].innerHTML = 'anytime';
        //elements[2].value = 'y';
        //elements[3].innerHTML = 'year';
        //elements[4].value = 'm';
        //elements[5].innerHTML = 'month';
        //elements[6].value = 'w';
        //elements[7].innerHTML = 'week';
        //elements[8].value = 'd';
        //elements[9].innerHTML = '24h';

        // where to insert
        var res = xpath_ordered('table//table[@class]');
        var elem;
        if (res.snapshotLength == 0) {
            res = xpath_ordered('//input[@name="q"]');
            elem = res.snapshotItem(0);
            insert_after(document.createElement('br'), elem)
            elem = elem.nextSibling;
        } else {
            elem = res.snapshotItem(0);
        }
        insert_after(select_time_elem, elem);
    }

    var input_lr_res = xpath('//input[@name="lr" and @value="lang_ja"]');
    var input_meta_lr_res = xpath('//input[@name="meta" and @value="lr=lang_ja"]');
    if (input_lr_res.snapshotLength == 0 && input_meta_lr_res.snapshotLength == 0) {
        var radio_lang_elem =
            create_element(<><span style="text-align: left; font-size: small;">Search<input
                           id="all" type="radio" name="lr" value="" /><label for="all">the Web</label><input
                           id="il" type="radio" name="lr" value="lang_ja" /><label for="il">Japanese pages</label></span></>);

        // where to insert
        var qdr_res = xpath('//select[@name="as_qdr"]');
        if (qdr_res.snapshotLength == 0) {
            // span element holding input element named as_qdr
            qdr_res = xpath_ordered('//span[input/@name="as_qdr"]');
        }
        insert_after(radio_lang_elem, qdr_res.snapshotItem(0));
    }

    var input_hl_res = xpath_ordered('//input[@name="hl"]'); // hidden or other type
    var radio_hl_elem =
        create_element(<><span style="text-align: left; font-size: small;"><input
                       id="hl" type="radio" name="hl" value="" /><label for="hl">hl=</label><input
                       id="hlja" type="radio" name="hl" value="ja" /><label for="hlja">hl=ja</label></span></>);
    if (input_hl_res.snapshotLength != 0) {
        // where to insert
        var input_hl_elem = input_hl_res.snapshotItem(0);
        input_hl_elem.parentNode.replaceChild(radio_hl_elem, input_hl_elem);
    } else if (document.URL.match('[?&]hl=[a-z]+')) {
        // where to insert
        var qdr_res = xpath_ordered('//select[@name="as_qdr"]');
        if (qdr_res.snapshotLength == 0) {
            // span element holding input element named as_qdr
            qdr_res = xpath_ordered('//span[input/@name="as_qdr"]');
        }
        insert_before(radio_hl_elem, qdr_res.snapshotItem(0));
    }

})();