// [[User:Quarl/util.js]] - miscellaneous utility functions for Wikipedia user scripts

// quarl 2006-01-09 initial version

// NON-NAMESPACED FUNCTION NAMES ARE DEPRECATED

// <pre><nowiki>

/////////////////////////////////////////////////////////////
// STRING UTILITY FUNCTIONS

util = new Object();

util.trimSpaces = function(s) {
    if (!s) return s;
    s = s.replace(/^\s+/,'');
    s = s.replace(/\s+$/,'');
    return s;
}
trimspaces = util.trimSpaces;

util.trimLines = function(s) {
    return s.replace(/^\n+/, '').replace(/\n+$/, '');
}
trim_lines = util.trimLines;

util.stringQuoteEscape = function(str) {
    if (!str) return str;
    return "'" + str.replace(/\'/g, '\\\'').replace(/\%27/g, '\\\'') + "'";
}
string_quote_escape = util.stringQuoteEscape;

// wiki article name escaping
util.wpaEscape = function(s) {
    // encodeURIComponent is better than 'escape' for unicode chars;
    // it also escapes '+'.
    // Don't escape ':'
    return encodeURIComponent(s.replace(/ /g,'_')).replace(/%3A/g,':').replace(/%2F/g,'/');
}
wpaescape = wpaencode = util.wpaEscape;

util.wpaDecode = function(s) {
    return decodeURIComponent(s).replace(/_/g,' ');
}
wpaunescape = wpadecode = util.wpaDecode;

util.urlGetPath = function(s) {
    return s.replace(/^http:\/\/[^\/]+/, '');
}
url_getpath = util.urlGetPath;

// Return an authentication token useful to pass through URL for automatic
// edits, to prevent XSS attacks.
//
// requires md5.js
util.makeAuthToken = function() {
    // I'd like to use something like readCookie('enwikiToken') + '%' +
    // readCookie('enwiki_session')), but not sure how to get it cross-wiki
    // compatible, so just use entire cookie for now.

    return hex_md5('auth_token:'+Array.join(arguments, '%') +
                   '%%' + document.cookie);
}
makeAuthToken = util.makeAuthToken;

////////////////////////////////////////////////////////////
// DOM UTILITY FUNCTIONS
util.getElementsByClass = function(searchClass, node, tag) {
    var classElements = [];
    if (node == null)
        node = document;
    if (tag == null)
        tag = '*';
    var els = node.getElementsByTagName(tag);
    var elsLen = els.length;
    var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
    for (var i = 0; i < elsLen; i++) {
        if (pattern.test(els[i].className) ) {
            classElements.push(els[i]);
        }
    }
    return classElements;
}
getElementsByClass = util.getElementsByClass;

util.addClass = function(node, cls) {
    node.className += ' '+cls;
}
addClass = util.addClass;

util.removeClass = function(node, cls) {
    node.className = node.className.replace(
        new RegExp("(^|\\s)"+cls+"(\\s|$)",'g'), ' ');
}
removeClass = util.removeClass;

util.addNodeBefore = function(node, newnode) {
    node.parentNode.insertBefore(newnode, node);
    return newnode;
}
add_before = util.addNodeBefore;

util.addNodeBefore = function(node, newnode) {
    if (node.nextSibling) {
        node.parentNode.insertBefore(newnode, node.nextSibling);
    } else {
        node.parentNode.appendChild(newnode);
    }
    return newnode;
}
add_after = util.addNodeBefore;

// return nodes in [node_start, node_end)
util.getNodesInRange = function(node_start, node_end) {
    var nodes = [];
    while (node_start != node_end) {
        nodes.push(node_start);
        node_start = node_start.nextSibling;
        if (!node_start) return null; // didn't reach node_end!
    }
    return nodes;
}
getNodesInRange = util.getNodesInRange;

util.removeNodesInRange = function(node_start, node_end) {
    if (!node_end) {
        alert("## removeNodesInRange: node_end==null");
        return null;
    }
    if (!util.getNodesInRange(node_start, node_end)) {
        alert("## removeNodesInRange: range does not terminate");
        return null;
    }
    var parent = node_start.parentNode;
    while (node_start != node_end) {
        var n = node_start.nextSibling; // save before it gets clobbered
        parent.removeChild(node_start);
        node_start = n;
        if (!node_start) return null;
    }
}
removeNodesInRange = util.removeNodesInRange;

util.createHref = function(href, title, inner) {
    var a = document.createElement('a');
    a.href = href;
    a.title = title;
    a.innerHTML = inner;
    return a;
}
createHref = util.createHref;

util.findHref = function(href) {
    href = util.wpaEscape(util.wpaDecode(href));
    var links=document.links;
    for(i=0;i<links.length;++i) {
        // unescape and reescape to ensure canonical escaping
        if (util.wpaEscape(util.wpaDecode(links[i].href)) == href) return links[i];
    }
    return null;
}
findHref = util.findHref;

// insert a new node as parent of node
util.insertNode = function(node, newNode) {
    if (!node) return null;

    node.parentNode.replaceChild(newNode, node);
    newNode.appendChild(node);
    return newNode;
}
insertNode = util.insertNode;

util.appendChildren = function(node, newNodes) {
    for (var i in newNodes) {
        node.appendChild(newNodes[i]);
    }
}
appendChild = util.appendChild;

util.hookEventObj = function(obj, hookName, hookFunct) {
    if (!obj) return;

    if (obj.addEventListener)
        obj.addEventListener(hookName, hookFunct, false);
    else if (obj.attachEvent)
        obj.attachEvent("on" + hookName, hookFunct);
}
hookEventObj = util.hookEventObj;

util.copyArray = function(a) {
    var r = [];
    for (var i=0; i < a.length; i++)
        r[i] = a[i];
    return r;
}
copyArray = util.copyArray;

// add a span around a node if there isn't one.
util.ensureSpan = function(node) {
    if (node.parentNode.nodeName == 'SPAN') {
        return node.parentNode;
    }
    return insertNode(node, document.createElement('span'));
}
ensureSpan = util.ensureSpan;

////////////////////////////////////////////////////////////
// STYLESHEET FUNCTIONS
util.addStylesheetRule = function(tag, style) {
    var ss = document.styleSheets[0];
    if (ss.insertRule) {
        ss.insertRule(tag + '{' + style + '}', ss.cssRules.length);
    } else if (ss.addRule) {
        ss.addRule(tag, style);
    }
}
addStylesheetRule = util.addStylesheetRule;

////////////////////////////////////////////////////////////
// AJAX FUNCTIONS

// cross-platform
util.HTTPClient = function() {
    var http;
    if(window.XMLHttpRequest) {
        http = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        try {
            http = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (E) {
                http = false;
            }
        }
    }
    return http;
}
HTTPClient = util.HTTPClient;

util.asyncDownloadXML = function(url, callback, props) {
    var req = util.HTTPClient();
    if (!req) return null;
    // add optional arguments
    if (props) {
        for (var k in props) {
            req[k] = props[k];
        }
    }
    req.open("GET", url, true);
    req.overrideMimeType('text/xml');
    // using onload instead of onreadystatechange allows multiple asynchronous requests
    // TODO: since we now have access to 'req' as a variable, we could change back.
    // Is there any advantage to using onreadystatechange?
    req.onload = function(event) {
        var req = event.target;
        if (req.readyState == 4) callback(req);
    };
    req.send(null);
    return req;
}
asyncDownloadXML = util.asyncDownloadXML;

util.buildParams = function(paramArray) {
    var params = '';
    for (k in paramArray) {
        v = paramArray[k];
        // if v is a Boolean then the form was a checkbox.
        // unchecked checkboxes should not add any input fields.
        if (v == false) continue;
        if (v == true) v = 'on';
        params += '&' + k + '=' + encodeURIComponent(v);
    }
    params = params.replace(/^&/,'');
    return params;
}
buildParams = util.buildParams;

util.addFormHiddenParams = function(newform, d) {
    for (var k in d) {
        v = d[k];
        // if v is a Boolean then the form was a checkbox.
        // unchecked checkboxes should not add any input fields.
        if (v == false) continue;
        if (v == true) v = 'on';
        var t = document.createElement('input');
        t.type = 'hidden';
        t.name = k;
        t.value = d[k];
        newform.appendChild(t);
    }
    return newform;
}
addFormHiddenParams = util.addFormHiddenParams;

util.asyncPostXML = function(url, parameters, callback, props) {
    var req = util.HTTPClient();
    if (!req) return null;
    if (typeof parameters != 'string') parameters = buildParams(parameters);
    // add optional arguments
    if (props) {
        for (var k in props) {
            req[k] = props[k];
        }
    }
    req.open("POST", url, true);
    req.overrideMimeType('text/xml');
    req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    req.setRequestHeader("Content-length", parameters.length);
    req.setRequestHeader("Connection", "close");
    req.onload = function(event) {
        var req = event.target;
        if (req.readyState == 4) callback(req);
    };
    req.send(parameters);
    return req;
}
asyncPostXML = util.asyncPostXML;

// Temporarily replace the content of statusNode with a non-clicakble, bolded string
// that shows we're doing something.  statusNode should be the node that completely wraps
// an <a> element that was just clicked.
util.buttonShowStatus = function(statusNode, statusText) {
    if (!statusNode) return;

    if (!statusText) {
        // use <a> tag to keep padding/margin/color/etc.
        statusText = '<a><b>'+statusNode.textContent+'...</b></a>';
    }

    // Note: saving innerHTML doesn't work if we've messed with the document
    // tree.

    // statusNode.savedContent = statusNode.innerHTML;
    // statusNode.innerHTML = statusText;

    statusNode.savedContent = util.copyArray(statusNode.childNodes);
    statusNode.innerHTML = statusText;
}
buttonShowStatus = util.buttonShowStatus;

util.buttonRestoreStatus = function(statusNode) {
    if (statusNode && statusNode.savedContent) {
        // statusNode.innerHTML = statusNode.savedContent;
        statusNode.innerHTML = '';
        util.appendChildren(statusNode, statusNode.savedContent);
    }
}
buttonRestoreStatus = util.buttonRestoreStatus;

//

// </nowiki></pre>