+var locked;
+var unlocked;
+var workarea;
+var scriptcell;
+var goalcell;
+var goals;
+var goalview;
+var filename;
+var logarea;
+var advanceButton;
+var retractButton;
+var cursorButton;
+var bottomButton;
+var metasenv = "";
+
+function initialize()
+{
+ locked = document.getElementById("locked");
+ unlocked = document.getElementById("unlocked");
+ workarea = document.getElementById("workarea");
+ scriptcell = document.getElementById("scriptcell");
+ goalcell = document.getElementById("goalcell");
+ goals = document.getElementById("goals");
+ goalview = document.getElementById("goalview");
+ filename = document.getElementById("filename");
+ logarea = document.getElementById("logarea");
+ advanceButton = document.getElementById("advance");
+ retractButton = document.getElementById("retract");
+ cursorButton = document.getElementById("cursor");
+ bottomButton = document.getElementById("bottom");
+
+ // hide sequent view at start
+ hideSequent();
+}
+
+function debug(txt)
+{
+ logarea.innerHTML = txt + "\n" + logarea.innerHTML;
+}
+
+function listhd(l)
+{
+ ar = l.split("#");
+ debug("hd of '" + l + "' = '" + ar[0] + "'");
+ return (ar[0]);
+}
+
+function listtl(l)
+{
+ i = l.indexOf("#");
+ tl = l.substr(i+1);
+ debug("tl of '" + l + "' = '" + tl + "'");
+ return (tl);
+}
+
+function listcons(x,l)
+{
+ debug("cons '" + x + "' on '" + l + "'");
+ return (x + "#" + l);
+}
+
+function listnil()
+{
+ return ("");
+}
+
+function is_nil(l)
+{
+ return (l == "");
+}
+
+function fold_left (f,acc,l)
+{
+ if (is_nil(l))
+ { debug("'" + l + "' is fold end");
+ return (acc); }
+ else
+ { debug("'" + l + "' is fold cons");
+ return(fold_left (f,f(acc,(listhd(l))),listtl(l))); }
+}
+
+function listiter (f,l)
+{
+ if (is_nil(l))
+ { debug("'" + l + "' is nil");
+ return;
+ }
+ else
+ {
+ debug("'" + l + "' is not nil");
+ f(listhd(l));
+ listiter(f,listtl(l));
+ }
+}
+
+function listmap (f,l)
+{
+ debug("listmap on " + l);
+ if (is_nil(l))
+ { debug("returning listnil");
+ return(listnil());
+ }
+ else
+ { debug("cons f(hd) map(f,tl)");
+ return(f(listhd(l)) + "#" + listmap(f,listtl(l)));
+ }
+}
+
+var statements = listnil();
+
+var goalarray;
+var metalist = listnil();
+
+function pairmap (f,p)
+{
+ debug("pairmap of '" + p + "'");
+ ar = p.split("|");
+ return (f(ar[0],ar[1]));
+}
+
+function tripletmap (f,p)
+{
+ debug("tripletmap of '" + p + "'");
+ ar = p.split("|");
+ return (f(ar[0],ar[1],ar[2]));
+}
+
+function fst (p)
+{
+ debug("fst");
+ return (pairmap (function (a,b) { return (a); }, p));
+}
+
+function p13 (p)
+{
+ debug("p13");
+ return (tripletmap (function (a,b,c) { return (a); }, p));
+}
+
+function p23 (p)
+{
+ debug("p23");
+ return (tripletmap (function (a,b,c) { return (b); }, p));
+}
+
+function p33 (p)
+{
+ debug("f33");
+ return (tripletmap (function (a,b,c) { return (c); }, p));
+}
+
+function populate_goalarray(txt)
+{
+ if (txt == "") {
+ try {
+ hideSequent();
+ } catch (err) { };
+ } else {
+ showSequent();
+ debug("populate with '" + txt + "'");
+ goalarray = new Array();
+ metalist = listnil();
+ var tmp_goallist = "";
+ listiter (function(item)
+ {
+ debug ("item is '" + item + "'");
+ tripletmap (function(a,ahtml,b) {
+ debug ("found meta n. " + a);
+ debug ("found goal\nBEGIN" + unescape(b) + "\nEND");
+ goalarray[a] = unescape(b);
+ tmp_goallist = " <A href=\"javascript:switch_goal(" + a + ")\">" + unescape(ahtml) + "</A>" + tmp_goallist;
+ metalist = listcons(a,metalist);
+ debug ("goalarray[\"" + a + "\"] = " + goalarray[a]);
+ },item);
+ }, txt);
+ // metalist = listmap (p13,txt);
+ goals.innerHTML = tmp_goallist;
+ debug("new metalist is '" + metalist + "'");
+ if (is_nil(metalist)) {
+ switch_goal();
+ }
+ else {
+ switch_goal(listhd(metalist));
+ }
+ }
+}
+
+function switch_goal(meta)
+{
+ if (typeof meta == "undefined") {
+ goalview.innerHTML = "";
+ }
+ else {
+ debug("switch_goal " + meta + "\n" + goalarray[meta]);
+ goalview.innerHTML = "<B>Goal ?" + meta + ":</B>\n\n" + goalarray[meta];
+ }
+}
+
+String.prototype.unescapeHTML = function()
+{
+ var patt1 = /<br(\/|)>/gi;
+ var patt2 = /</gi;
+ var patt3 = />/gi;
+ var result = this;
+ result = result.replace(patt1,"\n");
+ result = result.replace(patt2,"<");
+ result = result.replace(patt3,">");
+ return (unescape(result));
+}
+
+function pause()
+{
+ advanceButton.disabled = true;
+ retractButton.disabled = true;
+ cursorButton.disabled = true;
+ bottomButton.disabled = true;
+}
+
+function resume()
+{
+ advanceButton.disabled = false;
+ retractButton.disabled = false;
+ cursorButton.disabled = false;
+ bottomButton.disabled = false;
+}
+
+function is_defined(x)
+{
+ return (typeof x != "undefined");
+}
+
+/* servicename: name of the service being called
+ * reqbody: text of the request
+ * processResponse: processes the server response
+ * (takes the response text in input, undefined in case of error)
+ */
+function callServer(servicename,processResponse,reqbody)
+{
+ var req = null;
+ // pause();
+ if (window.XMLHttpRequest)
+ {
+ req = new XMLHttpRequest();
+ }
+ else if (window.ActiveXObject)
+ {
+ try {
+ req = new ActiveXObject("Msxml2.XMLHTTP");
+ } catch (e)
+ {
+ try {
+ req = new ActiveXObject("Microsoft.XMLHTTP");
+ } catch (e) {}
+ }
+ }
+ req.onreadystatechange = function()
+ {
+
+ rs = req.readyState;
+
+ if(rs == 4)
+ {
+ stat = req.status;
+ stxt = req.statusText;
+ if(stat == 200)
+ {
+ processResponse(req.responseText);
+ } else {
+ processResponse();
+ }
+ // resume();
+ }
+ };
+ req.open("POST", servicename); // + escape(unlocked.innerHTML), true);
+ if (reqbody) {
+ req.send(reqbody);
+ } else {
+ req.send();
+ }
+
+}
+
+function advanceForm1()
+{
+ processor = function(responseText) {
+ if (is_defined(responseText)) {
+ // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
+ response = responseText.split("@");
+ len = parseInt(response[0]);
+ len0 = unlocked.innerHTML.length;
+ unescaped = unlocked.innerHTML.unescapeHTML();
+ parsedtxt = unescaped.substr(0,len);
+ unparsedtxt = unescaped.substr(len);
+ locked.innerHTML = locked.innerHTML + parsedtxt;
+ unlocked.innerHTML = unparsedtxt;
+ len1 = unlocked.innerHTML.length;
+ len2 = len0 - len1;
+ metasenv = response[1];
+ populate_goalarray(response[1]);
+ statements = listcons(len2,statements);
+ unlocked.scrollIntoView(true);
+ } else {
+ debug("advance failed");
+ }
+ resume();
+ };
+ pause();
+ callServer("advance",processor,unlocked.innerHTML.unescapeHTML());
+
+}
+
+function gotoBottom()
+{
+ processor = function(responseText) {
+ if (is_defined(responseText)) {
+ // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
+ response = responseText.split("@");
+ len = parseInt(response[0]);
+ len0 = unlocked.innerHTML.length;
+ unescaped = unlocked.innerHTML.unescapeHTML();
+ parsedtxt = unescaped.substr(0,len);
+ unparsedtxt = unescaped.substr(len);
+ locked.innerHTML = locked.innerHTML + parsedtxt;
+ unlocked.innerHTML = unparsedtxt;
+ len1 = unlocked.innerHTML.length;
+ len = len0 - len1;
+ populate_goalarray(response[1]);
+ statements = listcons(len,statements);
+ unlocked.scrollIntoView(true);
+ } else {
+ debug("goto bottom failed");
+ }
+ resume();
+ };
+ pause();
+ callServer("bottom",processor,unlocked.innerHTML.unescapeHTML());
+
+}
+
+
+function gotoPos(offset)
+{
+ if (!is_defined(offset)) {
+ offset = getCursorPos();
+ }
+ processor = function(responseText) {
+ if (is_defined(responseText)) {
+ // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
+ response = responseText.split("@");
+ len = parseInt(response[0]);
+ len0 = unlocked.innerHTML.length;
+ unescaped = unlocked.innerHTML.unescapeHTML();
+ parsedtxt = unescaped.substr(0,len);
+ unparsedtxt = unescaped.substr(len);
+ locked.innerHTML = locked.innerHTML + parsedtxt;
+ unlocked.innerHTML = unparsedtxt;
+ len1 = unlocked.innerHTML.length;
+ len2 = len0 - len1;
+ statements = listcons(len2,statements);
+ metasenv = response[1];
+ // la populate non andrebbe fatta a ogni passo
+ if (offset <= len) {
+ populate_goalarray(response[1]);
+ resume();
+ } else {
+ gotoPos(offset - len);
+ }
+ } else {
+ unlocked.scrollIntoView(true);
+ populate_goalarray(metasenv);
+ resume();
+ }
+ }
+ pause();
+ callServer("advance",processor,unlocked.innerHTML.unescapeHTML());
+}
+
+function retract()
+{
+ processor = function(responseText) {
+ if (typeof responseText != "undefined") {
+ debug("retract: received response\nBEGIN\n" + responseText + "\nEND");
+ statementlen = parseInt(listhd(statements));
+ statements = listtl(statements);
+ lockedlen = locked.innerHTML.length - statementlen;
+ statement = locked.innerHTML.substr(lockedlen, statementlen);
+ locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
+ unlocked.innerHTML = statement + unlocked.innerHTML;
+ populate_goalarray(responseText);
+ unlocked.scrollIntoView(true);
+ } else {
+ debug("retract failed");
+ }
+ resume();
+ };
+ debug("retract 1");
+ pause();
+ callServer("retract",processor);
+ debug("retract 2");
+}
+
+function openFile()
+{
+ processor = function(responseText)
+ {
+ if (responseText) {
+ locked.innerHTML = "";
+ unlocked.innerHTML = responseText;
+ } else {
+ debug("file open failed");
+ }
+ };
+ callServer("open?file=" + escape(filename.value),processor);
+}
+
+var goalcell;
+
+function hideSequent() {
+ goalcell.parentNode.removeChild(goalcell);
+ scriptcell.setAttribute("colspan","2");
+}
+
+function showSequent() {
+ scriptcell.setAttribute("colspan","1");
+ workarea.appendChild(goalcell);
+}
+
+function removeElement(id) {
+ var element = document.getElementById(id);
+ element.parentNode.removeChild(element);
+}
+
+function getCursorPos() {
+ var cursorPos;
+ if (window.getSelection) {
+ var selObj = window.getSelection();
+ var selRange = selObj.getRangeAt(0);
+ //cursorPos = findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
+ cursorPos = findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
+ /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
+ return(cursorPos);
+ }
+ else if (document.selection) {
+ var range = document.selection.createRange();
+ var bookmark = range.getBookmark();
+ /* FIXME the following works wrong when the document is longer than 65535 chars */
+ cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
+ return(cursorPos);
+ }
+}
+
+function findNode(list, node, acc) {
+ for (var i = 0; i < list.length; i++) {
+ if (list[i] == node) {
+ // debug("success " + i);
+ return acc;
+ }
+ if (list[i].hasChildNodes()) {
+ try {
+ // debug("recursion on node " + i);
+ return (findNode(list[i].childNodes,node,acc))
+ }
+ catch (e) { /* debug("recursion failed"); */ }
+ }
+ sandbox = document.getElementById("sandbox");
+ dup = list[i].cloneNode(true);
+ sandbox.appendChild(dup);
+// debug("fail " + i + ": " + sandbox.innerHTML);
+ acc += sandbox.innerHTML.length;
+ sandbox.removeChild(dup);
+ }
+ throw "not found";
+}
+
+function test () {
+ debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
+}