appjet_987703854.js

/* appjet:version 0.1 */
print(H1(appjet.appName));
print(P(A({href:'http://docs.lib-html-xpath.appjet.net/'},'documentation')));

/* appjet:library */

/**
 * @overview Library for searching html with XPath<br><br>
 *
 * In particular, it defines the function xget().
 */

import('lib-json');

/**
 * This function searches html with XPath.
 *
 * @param {string} url URL to search
 * @param {string} xpath XPath
 * @return {array} search result
 * @return {string} error message if search failed
 *
 * @example
var result = xget('http://lib-html-xpath.appjet.net/', '//h1');
print(result.h1); // prints "lib-html-xpath"
 *
 */
 var xget = function(url, xpath) {
    var yql = "select * from html where url=\""
        + url
        + "\" and xpath='"
        + xpath
        + "'";
    var url = 'http://query.yahooapis.com/v1/public/yql';
    var content = wget(url, {
        q: yql,
        format: 'json',
        callback: ''
    });
    var json = JSON.parse(content);
    
    if(json.query.diagnostics.warning) {
        return json.query.diagnostics.warning[0];
    }

    if(json.query.diagnostics.url.error) {
        return json.query.diagnostics.url['http-status-message'];
    }

    if(!json.query.results) {
        return [];
    }
    
    return json.query.results;
}