From 44d1a5a9f71b03d9aceeccd760a63fcdc45f8bad Mon Sep 17 00:00:00 2001
From: hallgren <hallgren@chalmers.se>
Date: Wed, 12 Oct 2011 17:03:54 +0000
Subject: Improvements of "gf -server" mode and related setup

"gf -server" mode now contains everything needed to run the minibar and
the grammar editor (including example-based grammar writing).

The Setup.hs script installs the required files where gf -server can find them.
These files have been moved to a new directory: src/www.

The separate server program pgf-http is now obsolete.
---
 src/www/gfse/editor.js | 1114 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1114 insertions(+)
 create mode 100644 src/www/gfse/editor.js

(limited to 'src/www/gfse/editor.js')

diff --git a/src/www/gfse/editor.js b/src/www/gfse/editor.js
new file mode 100644
index 000000000..859f33a04
--- /dev/null
+++ b/src/www/gfse/editor.js
@@ -0,0 +1,1114 @@
+
+
+var editor=element("editor");
+
+/* -------------------------------------------------------------------------- */
+
+function initial_view() {
+    var current=local.get("current");
+    if(current>0) open_grammar(current-1);
+    else draw_grammar_list();
+    //debug(local.get("dir","no server directory yet"));
+}
+
+function draw_grammar_list() {
+    local.put("current",0);
+    editor.innerHTML="";
+    var uploaded=local.get("dir") && local.get("json_uploaded");
+    var cloud_upload=
+	a(jsurl("upload_json()"),
+	  [node("img",{"class":"cloud",
+		       src:"P/1306856253_weather_06.png",alt:"[Up Cloud]",
+		       title: uploaded
+		               ? "Click to upload grammar updates to the cloud"
+		               : "Click to store your grammars in the cloud"},
+		    [])]);
+    var home=div_class("home",[node("h3",{},
+				    [text("Your grammars"),cloud_upload])]);
+    if(uploaded) {
+	var cloud_download=
+	    a(jsurl("download_json()"),
+	      [node("img",{"class":"cloud",
+			   src:"P/1307545089_weather_04.png",alt:"[Down Cloud]",
+			   title:"Click to download grammar updates from the cloud"},
+		    [])]);
+	insertAfter(cloud_download,cloud_upload);
+    }
+    editor.appendChild(home)
+    var gs=ul([]);
+    function del(i) { return function () { delete_grammar(i); } }
+    function clone(i) { return function (g,b) { clone_grammar(i); } }
+    for(var i=0;i<local.count;i++) {
+	var grammar=local.get(i,null);
+	if(grammar && grammar.basename) {
+	    var link=a(jsurl("open_grammar("+i+")"),[text(grammar.basename)]);
+	    gs.appendChild(
+		node("li",{"class":"extensible"},
+		     [deletable(del(i),link,"Delete this grammar"),
+		      more(grammar,clone(i),"Clone this grammar")]))
+	}
+    }
+    if(local.get("count",null)==null)
+	home.appendChild(text("You have not created any grammars yet."));
+    else if(local.count==0)
+	home.appendChild(text("Your grammar list is empty."));
+    home.appendChild(gs);
+
+    home.appendChild(
+	ul([li([a(jsurl("new_grammar()"),[text("New grammar")])])]));
+    //editor.appendChild(text(local.count));
+    home.appendChild(empty_id("div","sharing"));
+}
+
+function new_grammar() {
+    var g={basename:"Unnamed",
+	   abstract:{cats:[],funs:[]},
+	   concretes:[]}
+    edit_grammar(g);
+}
+
+function remove_local_grammar(i) {
+    local.remove(i);
+    while(local.count>0 && !local.get(local.count-1))
+	local.count--;
+}
+
+function delete_grammar(i) {
+    var g=local.get(i);
+    var ok=confirm("Do you really want to delete the grammar "+g.basename+"?")
+    if(ok) {
+	remove_local_grammar(i)
+	remove_cloud_grammar(g)
+	initial_view();
+    }
+}
+
+function clone_grammar(i) {
+    var old=local.get(i);
+    var g={basename:old.basename,abstract:old.abstract,concretes:old.concretes}
+    save_grammar(g);
+    draw_grammar_list();
+}
+
+function open_grammar(i) {
+    var g=local.get(i);
+    g.index=i;
+    local.put("current",i+1);
+    edit_grammar(g);
+}
+
+function close_grammar(g) { save_grammar(g); draw_grammar_list(); }
+function reload_grammar(g) { save_grammar(g);  edit_grammar(g); }
+
+function save_grammar(g) {
+    if(g.index==null) g.index=local.count++;
+    local.put(g.index,g);
+}
+
+function edit_grammar(g) {
+    editor.innerHTML="";
+    editor.appendChild(draw_grammar(g));
+}
+
+
+function draw_grammar(g) {
+    var files=div_class("files",[draw_filebar(g),draw_file(g)]);
+    return div_class("grammar",[draw_namebar(g,files),files])
+
+}
+
+function draw_namebar(g,files) {
+    return div_class("namebar",
+		  [table([tr([td(draw_name(g)),
+			      td_right([draw_plainbutton(g,files),
+					upload_button(g),
+					draw_closebutton(g)])])])])
+}
+
+function draw_name(g) {
+    return editable("h3",text(g.basename),g,edit_name,"Rename grammar");
+}
+
+function draw_closebutton(g) {
+    var b=button("X",function(){close_grammar(g);});
+    b.title="Save and Close this grammar";
+    return b;
+}
+
+function draw_plainbutton(g,files) {
+    var b2;
+    function show_editor() { edit_grammar(g); }
+    function show_plain() {
+	files.innerHTML="<pre class=plain>"+show_grammar(g)+"</pre>"
+	b.style.display="none";
+	if(b2) b2.style.display="";
+	else {
+	    b2=button("Show editor",show_editor);
+	    insertAfter(b2,b);
+	}
+    }
+    var b=button("Show plain",show_plain);
+    b.title="Show plain text representaiton of the grammar";
+    return b;
+}
+
+function upload_button(g) {
+    var b=button("Compile",function(){upload(g);});
+    b.title="Upload the grammar to the server to check it in GF and test it in the minibar";
+    return b;
+}
+
+function lang(code,name) { return { code:code, name:name} }
+function lang1(name) {
+    var ws=name.split("/");
+    return ws.length==1 ? lang(name.substr(0,3),name) : lang(ws[0],ws[1]);
+}
+var languages =
+    map(lang1,"Amharic Arabic Bulgarian Catalan Danish Dutch English Finnish French German Hindi Ina/Interlingua Italian Latin Norwegian Polish Ron/Romanian Russian Spanish Swedish Thai Turkish Urdu".split(" "));
+languages.push(lang("Other","Other"));
+
+var langname={};
+for(var i in languages)
+    langname[languages[i].code]=languages[i].name
+
+function concname(code) { return langname[code] || code; }
+
+function add_concrete(g,el) {
+    var file=element("file");
+    file.innerHTML="";
+    var dc={};
+    for(var i in g.concretes)
+	dc[g.concretes[i].langcode]=true;
+    var list=[]
+    for(var i in languages) {
+	var l=languages[i], c=l.code;
+	if(!dc[c])
+	    list.push(li([a(jsurl("add_concrete2("+g.index+",'"+c+"')"),
+			    [text(l.name)])]));
+    }
+    var from= g.current>0 
+	? "a copy of "+concname(g.concretes[g.current-1].langcode)
+	:"scratch";
+    file.appendChild(p(text("You are about to create a new concrete syntax by starting from "+from+".")));
+    file.appendChild(p(text("Pick a language for the new concrete syntax:")));
+    file.appendChild(node("ul",{"class":"languages"},list));
+}
+
+function new_concrete(code) {
+    return { langcode:code,params:[],lincats:[],opers:[],lins:[] };
+}
+
+function adjust_opens(cnc,oldcode,code) {
+    for(var oi in cnc.opens)
+	for(var li in rgl_modules)
+	    if(cnc.opens[oi]==rgl_modules[li]+oldcode)
+		cnc.opens[oi]=rgl_modules[li]+code;
+}
+
+function add_concrete2(ix,code) {
+    var g=local.get(ix);
+    var cs=g.concretes;
+    var ci;
+    for(var ci=0;ci<cs.length;ci++) if(cs[ci].langcode==code) break;
+    if(ci==cs.length) {
+	if(g.current>0) {
+	    cs.push(cs[g.current-1]); // old and new are shared at this point
+	    save_grammar(g); // serialization loses sharing
+	    g=local.get(ix); // old and new are separate now
+	    var oldcode=cs[g.current-1].langcode;
+	    var cnc=g.concretes[ci];
+	    cnc.langcode=code;
+	    adjust_opens(cnc,oldcode,code);
+	    timestamp(cnc)
+	}
+	else
+	    cs.push(new_concrete(code))
+	save_grammar(g);
+    }
+    open_concrete(g,ci);
+}
+
+function open_abstract(g) { g.current=0; reload_grammar(g); }
+function open_concrete(g,i) { g.current=i+1; reload_grammar(g); }
+
+function td_gap(c) {return wrap_class("td","gap",c); }
+function gap() { return td_gap(text(" ")); }
+
+function tab(active,link) {
+    return  wrap_class("td",active ? "active" : "inactive",link);
+}
+
+function delete_concrete(g,ci) {
+    var c=g.concretes[ci];
+    var ok=c.params.length==0 && c.lincats.length==0 && c.opers.length==0
+	   && c.lins.length==0
+	|| confirm("Do you really want to delete the concrete syntax for "+
+		   concname(c.langcode)+"?");
+    if(ok) {
+	g.concretes=delete_ix(g.concretes,ci)
+	if(g.current && g.current-1>=ci) g.current--;
+	reload_grammar(g);
+    }
+}
+
+function draw_filebar(g) {
+    var cur=(g.current||0)-1;
+    var filebar = empty_class("tr","extensible")
+    filebar.appendChild(gap());
+    filebar.appendChild(
+	tab(cur== -1,button("Abstract",function(){open_abstract(g);})));
+    var cs=g.concretes;
+    function del(ci) { return function() { delete_concrete(g,ci); }}
+    function open_conc(i) { return function() {open_concrete(g,1*i); }}
+    for(var i in cs) {
+	filebar.appendChild(gap());
+	filebar.appendChild(
+	    tab(i==cur,deletable(del(i),button(concname(cs[i].langcode),open_conc(i)),"Delete this concrete syntax")));
+    }
+    filebar.appendChild(td_gap(more(g,add_concrete,"Add a concrete syntax")));
+    return wrap_class("table","tabs",filebar);
+}
+
+function draw_file(g) {
+    return g.current>0 // && g.current<=g.concretes.length
+	? draw_concrete(g,g.current-1)
+	: draw_abstract(g);
+}
+
+function draw_startcat(g) {
+    var abs=g.abstract;
+    var startcat = abs.startcat || abs.cats[0];
+    function opt(cat) { return option(cat,cat); }
+    var m= node("select",{},map(opt,abs.cats));
+    m.value=startcat;
+    m.onchange=function() { 
+	if(m.value!=abs.startcat) {
+	    abs.startcat=m.value;
+	    timestamp(abs);
+	    save_grammar(g); 
+	}
+    }
+    return indent([kw("flags startcat"),sep(" = "),m]);
+}
+
+function draw_abstract(g) {
+    var kw_cat = kw("cat");
+    kw_cat.title = "The categories (nonterminals) of the grammar are enumerated here. [C.3.2]";
+    var kw_fun = kw("fun");
+    kw_fun.title = "The functions (productions) of the grammar are enumerated here. [C.3.4]";
+    var flags=g.abstract.startcat || g.abstract.cats.length>1
+	? draw_startcat(g)
+	: text("");
+    function sort_funs() {
+	g.abstract.funs=sort_list(this,g.abstract.funs,"name");
+	timestamp(g.abstract);
+	save_grammar(g);
+    }
+    return div_id("file",
+		  [kw("abstract "),ident(g.basename),sep(" = "),
+		   draw_timestamp(g.abstract),
+		   flags,
+		   indent([extensible([kw_cat,
+				       indent(draw_cats(g))]),
+			   extensible([kw_fun,
+				       indent_sortable(draw_funs(g),sort_funs)])])]);
+}
+
+function add_cat(g,el) {
+    function add(s) {
+	var cats=s.split(/\s*(?:\s|[;])\s*/); // allow separating spaces or ";"
+	if(cats.length>0 && cats[cats.length-1]=="") cats.pop();
+	for(var i in cats) {
+	    var err=check_name(cats[i],"Category");
+	    if(err) return err;
+	}
+	for(var i in cats) g.abstract.cats.push(cats[i]);
+	timestamp(g.abstract);
+	reload_grammar(g);
+	return null;
+    }
+    string_editor(el,"",add);
+}
+
+function delete_cat(g,ix) {
+    with(g.abstract) cats=delete_ix(cats,ix);
+    timestamp(g.abstract);
+    reload_grammar(g);
+}
+
+function rename_cat(g,el,cat) {
+    function ren(newcat) {
+	if(newcat!="" && newcat!=cat) {
+	    var err=check_name(newcat,"Category");
+	    if(err) return err;
+	    var dc=defined_cats(g);
+	    if(dc[newcat]) return newcat+" is already in use";
+	    g=rename_category(g,cat,newcat);
+	    timestamp(g.abstract);
+	    reload_grammar(g);
+	}
+	return null;
+    }
+    string_editor(el,cat,ren);
+}
+
+function draw_cats(g) {
+    var cs=g.abstract.cats;
+    var es=[];
+    var defined={};
+    function eident(cat) {
+	function ren(g,el) { rename_cat(g,el,cat); }
+	return editable("span",ident(cat),g,ren,"Rename category");
+    }
+    function check(cat,el) {
+	return ifError(defined[cat],"Same category named twice",el);
+    }
+    function del(i) { return function() { delete_cat(g,i); }}
+    for(var i in cs) {
+	es.push(deletable(del(i),check(cs[i],eident(cs[i])),"Delete this category"));
+	defined[cs[i]]=true;
+	es.push(sep("; "));
+    }
+    es.push(more(g,add_cat,"Add more categories"));
+    return es;
+}
+
+function add_fun(g,el) {
+    function add(s) {
+	var p=parse_fun(s);
+	if(p.ok) {
+	    g.abstract.funs.push(p.ok);
+	    timestamp(g.abstract);
+	    reload_grammar(g);
+	    return null;
+	}
+	else
+	    return p.error
+    }
+    string_editor(el,"",add);
+}
+
+function edit_fun(i) {
+    return function (g,el) {
+	function replace(s) {
+	    var p=parse_fun(s);
+	    if(p.ok) {
+		var old=g.abstract.funs[i];
+		g.abstract.funs[i]=p.ok;
+		if(p.ok.name!=old.name) g=rename_function(g,old.name,p.ok.name);
+		if(show_type(p.ok.type)!=show_type(old.type))
+		    g=change_lin_lhs(g,p.ok);
+		timestamp(g.abstract);
+		reload_grammar(g);
+		return null;
+	    }
+	    else
+		return p.error;
+	}
+	string_editor(el,show_fun(g.abstract.funs[i]),replace);
+    }
+}
+
+function delete_fun(g,ix) {
+    with(g.abstract) funs=delete_ix(funs,ix);
+    timestamp(g.abstract);
+    reload_grammar(g);
+}
+
+function draw_funs(g) {
+    var funs=g.abstract.funs;
+    var es=[];
+    var dc=defined_cats(g);
+    var df={};
+    function del(i) { return function() { delete_fun(g,i); }}
+    function draw_efun(i,df) {
+	return editable("span",draw_fun(funs[i],dc,df),g,edit_fun(i),"Edit this function");
+    }
+    for(var i in funs) {
+	es.push(node_sortable("fun",funs[i].name,[deletable(del(i),draw_efun(i,df),"Delete this function")]));
+	df[funs[i].name]=true;
+    }
+    es.push(more(g,add_fun,"Add a new function"));
+    return es;
+}
+
+function draw_fun(fun,dc,df) {
+    function check(el) {
+	return ifError(dc[fun.name],
+		       "Function names must be distinct from category names",
+		       ifError(df[fun.name],"Same function defined twice",el));
+    }
+    return node("span",{},
+		[check(ident(fun.name)),sep(" : "),draw_type(fun.type,dc)]);
+}
+
+function draw_type(t,dc) {
+    var el=empty("span");
+    function check(t,el) {
+	return ifError(!dc[t],"Undefined category",el);
+    }
+    for(var i in t) {
+	if(i>0) el.appendChild(sep(" → "));
+	el.appendChild(check(t[i],ident(t[i])));
+    }
+    return el;
+}
+
+function edit_name(g,el) {
+    function change_name(name) {
+	if(name!=g.basename && name!="") {
+	    var err=check_name(name,"Grammar");
+	    if(err) return err;
+	    g.basename=name
+	    reload_grammar(g);
+	}
+	return null;
+    }
+    string_editor(el,g.basename,change_name)
+}
+/* -------------------------------------------------------------------------- */
+
+function draw_concrete(g,i) {
+    var conc=g.concretes[i];
+    function edit_langcode(g,el) {
+	function change_langcode(code) {
+	    var err=check_name(g.basename+code,"Name of concrete syntax");
+	    if(err) return err;
+	    adjust_opens(conc,conc.langcode,code);
+	    conc.langcode=code;
+	    timestamp(conc);
+	    reload_grammar(g);
+	}
+	string_editor(el,conc.langcode,change_langcode)
+    }
+    var kw_lincat=kw("lincat")
+    kw_lincat.title="The linearization type for each catagory in the abstract syntax is given here. [C.3.8]"
+    var kw_lin=kw("lin")
+    kw_lin.title="The linearization function for each function in the abstract syntax is given here. [C.3.9]"
+    var kw_param=kw("param")
+    kw_param.title="Parameter type definitions can be added here. [C.3.12]"
+    var kw_oper=kw("oper")
+    kw_oper.title="Operation definitions can be added here. [C.3.14]"
+    return div_id("file",
+		  [kw("concrete "),
+		   ident(g.basename),
+		   editable("span",ident(conc.langcode),g,
+			    edit_langcode,"Change language"),
+		   kw(" of "),ident(g.basename),sep(" = "),
+		   draw_timestamp(conc),
+		   indent([extensible([kw("open "),draw_opens(g,i)])]),
+		   indent([kw_lincat,draw_lincats(g,i)]),
+		   indent([kw_lin,draw_lins(g,i)]),
+		   indent([extensible([kw_param,draw_params(g,i)])]),
+		   indent([extensible([kw_oper,draw_opers(g,i)])]),
+		   exb_extra(g,i)
+		  ])
+}
+
+var rgl_modules=["Paradigms","Syntax","Lexicon","Extra"];
+
+function add_open(ci) {
+    return function (g,el) {
+	var conc=g.concretes[ci];
+	var os=conc.opens;
+	var ds={};
+	for(var i in os) ds[os[i]]=true;
+	var list=[]
+	for(var i in rgl_modules) {
+	    var b=rgl_modules[i], m=b+conc.langcode;
+	    if(!ds[m])
+		list.push(li([a(jsurl("add_open2("+g.index+","+ci+",'"+m+"')"),
+				[text(m)])]));
+	}
+	if(list.length>0) {
+	    var file=element("file");
+	    file.innerHTML="";
+	    file.appendChild(p(text("Pick a resource library module to open:")));
+	    file.appendChild(node("ul",{},list));
+	}
+    }
+}
+
+function add_open2(ix,ci,m) {
+    var g=local.get(ix);
+    var conc=g.concretes[ci];
+    conc.opens || (conc.opens=[]);
+    conc.opens.push(m);
+    timestamp(conc);
+    save_grammar(g);
+    open_concrete(g,ci);
+}
+
+function delete_open(g,ci,ix) {
+    with(g.concretes[ci]) opens=delete_ix(opens,ix);
+    timestamp(g.concretes[ci]);
+    reload_grammar(g);
+}
+
+function draw_opens(g,ci) {
+    var conc=g.concretes[ci];
+    var os=conc.opens || [] ;
+    var es=[];
+    function del(i) { return function() { delete_open(g,ci,i); }}
+    var first=true;
+    for(var i in os) {
+	if(!first) es.push(sep(", "))
+	es.push(deletable(del(i),ident(os[i]),"Don't open this module"));
+	first=false;
+    }
+    es.push(more(g,add_open(ci),"Open more modules"));
+    return indent(es);
+}
+
+function draw_param(p,dp) {
+    function check(el) {
+	return ifError(dp[p.name],"Same parameter type defined twice",el);
+    }
+    return node("span",{},[check(ident(p.name)),sep(" = "),text(p.rhs)]);
+}
+
+function add_param(g,ci,el) {
+    function add(s) {
+	var p=parse_param(s);
+	if(p.ok) {
+	    g.concretes[ci].params.push(p.ok);
+	    timestamp(g.concretes[ci]);
+	    reload_grammar(g);
+	    return null;
+	}
+	else
+	    return p.error
+    }
+    string_editor(el,"",add);
+}
+
+function edit_param(ci,i) {
+    return function (g,el) {
+	function replace(s) {
+	    var p=parse_param(s);
+	    if(p.ok) {
+		g.concretes[ci].params[i]=p.ok;
+		timestamp(g.concretes[ci]);
+		reload_grammar(g);
+		return null;
+	    }
+	    else
+		return p.error;
+	}
+	string_editor(el,show_param(g.concretes[ci].params[i]),replace);
+    }
+}
+
+
+function delete_param(g,ci,ix) {
+    with(g.concretes[ci]) params=delete_ix(params,ix);
+    timestamp(g.concretes[ci]);
+    reload_grammar(g);
+}
+
+function draw_params(g,ci) {
+    var conc=g.concretes[ci];
+    conc.params || (conc.params=[]);
+    var params=conc.params;
+    var es=[];
+    var dp={};
+    function del(i) { return function() { delete_param(g,ci,i); }}
+    function draw_eparam(i,dp) {
+	return editable("span",draw_param(params[i],dp),g,edit_param(ci,i),"Edit this parameter type");
+    }
+    for(var i in params) {
+	es.push(div_class("param",[deletable(del(i),draw_eparam(i,dp),"Delete this parameter type")]));
+	dp[params[i].name]=true;
+    }
+    es.push(more(g,function(g,el) { return add_param(g,ci,el)},
+		 "Add a new parameter type"));
+    return indent(es);
+}
+
+function delete_lincat(g,ci,cat) {
+    var i;
+    var c=g.concretes[ci];
+    for(i=0;i<c.lincats.length && c.lincats[i].cat!=cat;i++);
+    if(i<c.lincats.length) c.lincats=delete_ix(c.lincats,i);
+    timestamp(c);
+    reload_grammar(g);
+}
+
+function draw_lincats(g,i) {
+    var conc=g.concretes[i];
+    function edit(c) {
+	return function(g,el) {
+	    function check(s,cont) {
+		function check2(msg) {
+		    if(!msg) {
+			if(c.template) conc.lincats.push({cat:c.cat,type:s});
+			else c.type=s;
+			reload_grammar(g);
+		    }
+		    cont(msg);
+		}
+		check_exp(s,check2);
+	    }
+	    string_editor(el,c.type,check,true)
+	}
+    }
+    function del(c) { return function() { delete_lincat(g,i,c); } }
+    function dlc(c,cls) {
+	var t=editable("span",text_ne(c.type),g,edit(c),"Edit lincat for "+c.cat);
+	return node("span",{"class":cls},
+		    [ident(c.cat),sep(" = "),t]);
+    }
+    var dc=defined_cats(g);
+    function draw_lincat(c) {
+	var cat=c.cat;
+	var err=!dc[cat];
+	var l1=dlc(c,"lincat");
+	var l2= deletable(del(cat),l1,"Delete this lincat");
+	var l=ifError(err,"lincat for undefined category",l2);
+	delete dc[cat];
+	return node_sortable("lincat",cat,[l]);
+    }
+    function dtmpl(c) {	
+	return wrap("div",dlc({cat:c,type:"",template:true},"template")); }
+    var lcs=map(draw_lincat,conc.lincats);
+    for(var c in dc)
+	lcs.push(dtmpl(c));
+    function sort_lincats() {
+	conc.lincats=sort_list(this,conc.lincats,"cat");
+	timestamp(conc);
+	save_grammar(g);
+    }
+    return indent_sortable(lcs,sort_lincats);
+}
+
+/* -------------------------------------------------------------------------- */
+
+function draw_oper(p,dp) {
+    function check(el) {
+	return ifError(dp[p.name],"Same operator definition defined twice",el);
+    }
+    return node("span",{},[check(ident(p.name)),text(" "),text(p.rhs)]);
+}
+
+function check_oper(s,ok,err) {
+    var p=parse_oper(s);
+    function check2(msg) {
+	if(msg) err(msg);
+	else ok(p.ok)
+    }
+    if(p.ok) {
+	// Checking oper syntax by checking an expression with a local
+	// definition. Some valid opers will be rejected!!
+	var e=p.ok.name+" where { "+p.ok.name+" "+p.ok.rhs+" }";
+	check_exp(e,check2);
+    }
+    else
+	err(p.error);
+}
+
+function add_oper(g,ci,el) {
+    function check(s,cont) {
+	function ok(oper) {
+	    g.concretes[ci].opers.push(oper);
+	    timestamp(g.concretes[ci]);
+	    reload_grammar(g);
+	    cont(null);
+	}
+	check_oper(s,ok,cont)
+    }
+    string_editor(el,"",check,true);
+}
+
+function edit_oper(ci,i) {
+    return function (g,el) {
+	function check(s,cont) {
+	    function ok(oper) {
+		g.concretes[ci].opers[i]=oper;
+		timestamp(g.concretes[ci]);
+		reload_grammar(g);
+		cont(null);
+	    }
+	    check_oper(s,ok,cont)
+	}
+	string_editor(el,show_oper(g.concretes[ci].opers[i]),check,true);
+    }
+}
+
+function delete_oper(g,ci,ix) {
+    with(g.concretes[ci]) opers=delete_ix(opers,ix);
+    timestamp(g.concretes[ci]);
+    reload_grammar(g);
+}
+
+function draw_opers(g,ci) {
+    var conc=g.concretes[ci];
+    conc.opers || (conc.opers=[]);
+    var opers=conc.opers;
+    var es=[];
+    var dp={};
+    function del(i) { return function() { delete_oper(g,ci,i); }}
+    function draw_eoper(i,dp) {
+	return editable("span",draw_oper(opers[i],dp),g,edit_oper(ci,i),"Edit this operator definition");
+    }
+    for(var i in opers) {
+	es.push(node_sortable("oper",opers[i].name,
+			      [deletable(del(i),draw_eoper(i,dp),
+					 "Delete this operator definition")]));
+	dp[opers[i].name]=true;
+    }
+    es.push(more(g,function(g,el) { return add_oper(g,ci,el)},
+		 "Add a new operator definition"));
+    function sort_opers() {
+	conc.opers=sort_list(this,conc.opers,"name");
+	timestamp(conc);
+	save_grammar(g);
+    }
+    return indent_sortable(es,sort_opers);
+}
+
+function delete_lin(g,ci,fun) {
+    var i;
+    var c=g.concretes[ci];
+    for(i=0;i<c.lins.length && c.lins[i].fun!=fun;i++);
+    if(i<c.lins.length) c.lins=delete_ix(c.lins,i);
+    timestamp(c);
+    reload_grammar(g);
+}
+
+/* -------------------------------------------------------------------------- */
+function arg_names(type) {
+    function lower(s) { return s.toLowerCase(); }
+    var names=map(lower,type);
+    names.pop(); // remove result type
+    var n,count={},use={};
+    for(var i in names) n=names[i],count[n]=0,use[n]=0;
+    for(var i in names) count[names[i]]++;
+    function unique(n) {
+	return count[n]>1 ? n+(++use[n]) : n;
+    }
+    return map(unique,names);
+}
+
+function draw_lins(g,ci) {
+    var conc=g.concretes[ci];
+    function edit(f) {
+	return function(g,el) {
+	    function check(s,cont) {
+		function check2(msg) {
+		    if(!msg) {
+			if(f.template)
+			    conc.lins.push({fun:f.fun,args:f.args,lin:s});
+			else { f.lin=s; f.eb_lin=null; }
+			reload_grammar(g);
+		    }
+		    cont(msg);
+		}
+		check_exp(s,check2);
+	    }
+	    string_editor(el,f.lin,check,true)
+	}
+    }
+    function del(fun) { return function () { delete_lin(g,ci,fun); } }
+    function dl(f,cls) {
+	var l=[ident(f.fun)]
+	for(var i in f.args) {
+	    l.push(text(" "));
+	    l.push(ident(f.args[i]));
+	}
+	l.push(sep(" = "));
+	var t=editable("span",text_ne(f.lin),g,edit(f),"Edit lin for "+f.fun);
+	appendChildren(t,exb_linbuttons(g,ci,f));
+	l.push(t);
+	return node("span",{"class":cls},l);
+    }
+    var df=defined_funs(g);
+    function draw_lin(f) {
+	var fun=f.fun;
+	var err= !df[fun];
+	var l= deletable(del(fun),dl(f,"lin"),"Delete this linearization function")
+	var l=ifError(err,"Function "+fun+" is not part of the abstract syntax",l);
+	delete df[fun];
+	return node_sortable("lin",fun,[l]);
+    }
+    function largs(f) {
+	var funs=g.abstract.funs;
+	for(var i=0;i<funs.length && funs[i].name!=f;i++);
+	return arg_names(funs[i].type);
+    }
+    function dtmpl(f) {	
+	return div_class("template",
+			 [dl({fun:f,args:largs(f),lin:"",template:true},"template")]);
+    }
+    function sort_lins() {
+	conc.lins=sort_list(this,conc.lins,"fun");
+	timestamp(conc);
+	save_grammar(g);
+    }
+    var ls=map(draw_lin,conc.lins);
+    for(var f in df)
+	ls.push(dtmpl(f));
+    return indent_sortable(ls,sort_lins);
+}
+
+/* -------------------------------------------------------------------------- */
+
+function find_langcode(concs,langcode) {
+    for(var ci in concs)
+	if(concs[ci].langcode==langcode)
+	    return concs[ci];
+    return null;
+}
+
+function cleanup_deleted(files) {
+    var keep={}
+    for(var i in files) keep[files[i]]=true;
+    //debug("cleanup_deleted "+JSON.stringify(files))
+    //debug("keep "+JSON.stringify(keep))
+    for(var i=0;i<local.count;i++) {
+	var g=local.get(i,null)
+	if(g && g.unique_name && !keep[g.unique_name+".json"]) {
+	    debug("cleanup "+i+" "+g.unique_name);
+	    remove_local_grammar(i)
+	}
+    }
+}
+
+function grammar_index() {
+    var index={}
+    var count=local.count
+    for(var i=0;i<count;i++) {
+	var g=local.get(i,null)
+	if(g && g.unique_name) index[g.unique_name]=i
+    }
+    return index
+}
+
+function merge_grammar(i,newg) {
+    var oldg=local.get(i);
+    var keep="";
+    debug("Merging at "+i);
+    if(oldg) {
+	oldg.basename=newg.basename;
+	if(newg.abstract.timestamp<oldg.abstract.timestamp) {
+	    newg.abstract=newg.abstract
+	    keep+=" "+oldg.basename
+	}
+	for(var ci in newg.concretes) {
+	    var conc=newg.concretes[ci];
+	    var oldconc=find_langcode(oldg.concretes,conc.langcode);
+	    if(oldconc && conc.timestamp<oldconc.timestamp) {
+		newg.concretes[ci]=oldconc;
+		keep+=" "+oldg.basename+conc.langcode;
+	    }
+	}
+    }
+    local.put(i,newg)
+    return keep;
+}
+
+function timestamp(obj,prop) {
+    obj[prop || "timestamp"]=Date.now();
+}
+
+function draw_timestamp(obj) {
+    var t=obj.timestamp;
+    return node("small",{"class":"modtime"},
+		[text(t ? " -- "+new Date(t).toLocaleString() : "")]);
+}
+
+/* -------------------------------------------------------------------------- */
+
+function delete_ix(old,ix) {
+    var a=[];
+    for(var i in old) if(i!=ix) a.push(old[i]);
+    return a;
+}
+
+function sort_list(list,olditems,key) {
+    var items=[];
+    function find(fun) {
+	for(var i=0;i<olditems.length;i++)
+	    if(olditems[i][key]==fun) return olditems[i];
+	return null;
+    }
+    for(var el=list.firstChild;el;el=el.nextSibling) {
+	var name=el.getAttribute("ident")
+	if(name) {
+	    var old=find(name);
+	    if(old) items.push(old)
+	    else debug("Bug: did not find "+name+" while sorting");
+	}
+    }
+    if(items.length==olditems.length)
+	return items;
+    else {
+	debug("Bug: length changed while sorting")
+	return olditems;
+    }
+}
+
+function string_editor(el,init,ok,async) {
+    var p=el.parentNode;
+    function restore() {
+	e.parentNode.removeChild(e);
+	el.style.display="";
+    }
+    function done() {
+	var edited=e.it.value;
+	restore();
+	function cont(msg) { if(msg) start(msg); }
+	if(async) ok(edited,cont)
+	else cont(ok(edited));
+	return false;
+    }
+    function start(msg) {
+	el.style.display="none";
+	m.innerHTML=msg;
+	insertAfter(e,el);
+	e.it.focus();
+    }
+    var m=empty_class("span","error_message");
+    var i=node("input",{"class":"string_edit",name:"it",value:init},[]);
+    if(init.length>10) i.size=init.length+5;
+//  var i=node("textarea",{name:"it",rows:"2",cols:"60"},[text(init)]);
+    var e=node("form",{},
+	       [i,
+		node("input",{type:"submit",value:"OK"},[]),
+		button("Cancel",restore),
+		text(" "),
+		m])
+    e.onsubmit=done
+    start("");
+}
+
+function ifError(b,msg,el) { return b ? inError(msg,el) : el; }
+
+function inError(msg,el) {
+    return node("span",{"class":"inError",title:msg},[el]);
+}
+
+function kw(txt) { return wrap_class("span","kw",text(txt)); }
+function sep(txt) { return wrap_class("span","sep",text(txt)); }
+function ident(txt) { return wrap_class("span","ident",text(txt)); }
+function indent(cs) { return div_class("indent",cs); }
+
+function indent_sortable(cs,sort) {
+    var n= indent(cs);
+    n.onsort=sort;
+    return n;
+}
+
+function node_sortable(cls,name,ls) {
+    return node("div",{"class":cls,"ident":name},ls);
+}
+
+function extensible(cs) { return div_class("extensible",cs); }
+
+function more(g,action,hint) {
+    var b=node("span",{"class":"more","title":hint || "Add more"},
+	       [text(" + ")]);
+    b.onclick=function() { action(g,b); }
+    return b;
+}
+
+function text_ne(s) { // like text(s), but force it to be non-empty
+    return text(s ? s : "\xa0\xa0\xa0")
+}
+
+function editable(tag,cs,g,f,hint) {
+    var b=edit_button(function(){f(g,e)},hint);
+    var e=node(tag,{"class":"editable"},[cs,b]);
+    //e.onclick=b.onclick;
+    return e;
+}
+
+function edit_button(action,hint) {
+    var b=node("span",{"class":"edit","title":hint || "Edit"},[text("%")]);
+    b.onclick=action;
+    return b;
+}
+
+function deletable(del,el,hint) {
+    var b=node("span",{"class":"delete",title:hint || "Delete"},[text("×")])
+    b.onclick=del;
+    return node("span",{"class":"deletable"},[b,el])
+}
+
+function touch_edit() {
+    var b=node("input",{type:"checkbox"},[]);
+    function touch() {
+	document.body.className=b.checked ? "nohover" : "hover";
+    }
+    b.onchange=touch;
+    insertAfter(b,editor);
+    insertAfter(wrap("small",text("Enable editing on touch devices. ")),b);
+}
+/* --- DOM Support ---------------------------------------------------------- */
+
+function div_id(id,cs) { return node("div",{id:id},cs); }
+function div_class(cls,cs) { return node("div",{"class":cls},cs); }
+function a(url,linked) { return node("a",{href:url},linked); }
+function ul(lis) { return node("ul",{},lis); }
+function li(xs) { return node("li",{},xs); }
+function table(rows) { return node("table",{},rows); }
+function td_right(cs) { return node("td",{"class":"right"},cs); }
+function jsurl(js) { return "javascript:"+js; }
+
+function hidden(name,value) {
+    return node("input",{type:"hidden",name:name,value:value},[])
+}
+
+function insertBefore(el,ref) { ref.parentNode.insertBefore(el,ref); }
+
+function insertAfter(el,ref) {
+    ref.parentNode.insertBefore(el,ref.nextSibling);
+}
+/* -------------------------------------------------------------------------- */
+
+function download_from_cloud() {
+    var newdir="/tmp/"+location.hash.substr(1)
+
+    function download2(olddir) {
+	//debug("Starting grammar sharing in the cloud")
+	if(newdir!=olddir) link_directories(newdir,download3)
+	else download4()
+    }
+    function download3() {
+	//debug("Uploading local grammars to cloud");
+	upload_json(download4)
+    }
+    function download4() {
+	//debug("Downloading grammars from the cloud");
+	download_json()
+    }
+
+    with_dir(download2)
+}
+
+/* --- Initialization ------------------------------------------------------- */
+
+//document.body.appendChild(empty_id("div","debug"));
+
+function dir_bugfix() {
+    // remove trailing newline caused by bug in older version
+    var dir=local.get("dir");
+    if(dir) {
+	var n=dir.length;
+	while(dir[dir.length-1]=="\n" || dir[dir.length-1]=="\r")
+	    dir=dir.substr(0,dir.length-1)
+	if(dir.length<n) {
+	    debug("removing trailing newline")
+	    local.put("dir",dir);
+	}
+	//debug("Server directory: "+JSON.stringify(dir))
+    }
+    else debug("No server directory yet")
+}
+
+if(editor) {
+    initial_view();
+    touch_edit();
+    dir_bugfix();
+}
+
+//console.log("hi")
-- 
cgit v1.2.3