1

// svghmi.js

     2

     3

var cache = hmitree_types.map(_ignored => undefined);

     4

var updates = {};

     5

var need_cache_apply = []; 

     6

     7

function dispatch_value_to_widget(widget, index, value, oldval) {

     8

    try {

     9

        let idx = widget.offset ? index - widget.offset : index;

    10

        let idxidx = widget.indexes.indexOf(idx);

    11

        let d = widget.dispatch;

    12

        if(typeof(d) == "function" && idxidx == 0){

    13

            d.call(widget, value, oldval);

    14

        }

    15

        else if(typeof(d) == "object" && d.length >= idxidx){

    16

            d[idxidx].call(widget, value, oldval);

    17

        }

    18

        /* else dispatch_0, ..., dispatch_n ? */

    19

        /*else {

    20

            throw new Error("Dunno how to dispatch to widget at index = " + index);

    21

        }*/

    22

    } catch(err) {

    23

        console.log(err);

    24

    }

    25

}

    26

    27

function dispatch_value(index, value) {

    28

    let widgets = subscribers[index];

    29

    30

    let oldval = cache[index];

    31

    cache[index] = value;

    32

    33

    if(widgets.size > 0) {

    34

        for(let widget of widgets){

    35

            dispatch_value_to_widget(widget, index, value, oldval);

    36

        }

    37

    }

    38

};

    39

    40

function init_widgets() {

    41

    Object.keys(hmi_widgets).forEach(function(id) {

    42

        let widget = hmi_widgets[id];

    43

        let init = widget.init;

    44

        if(typeof(init) == "function"){

    45

            try {

    46

                init.call(widget);

    47

            } catch(err) {

    48

                console.log(err);

    49

            }

    50

        }

    51

    });

    52

};

    53

    54

// Open WebSocket to relative "/ws" address

    55

var ws = new WebSocket(window.location.href.replace(/^http(s?:\/\/[^\/]*)\/.*$/, 'ws$1/ws'));

    56

ws.binaryType = 'arraybuffer';

    57

    58

const dvgetters = {

    59

    INT: (dv,offset) => [dv.getInt16(offset, true), 2],

    60

    BOOL: (dv,offset) => [dv.getInt8(offset, true), 1],

    61

    NODE: (dv,offset) => [dv.getInt8(offset, true), 1],

    62

    STRING: (dv, offset) => {

    63

        size = dv.getInt8(offset);

    64

        return [

    65

            String.fromCharCode.apply(null, new Uint8Array(

    66

                dv.buffer, /* original buffer */

    67

                offset + 1, /* string starts after size*/

    68

                size /* size of string */

    69

            )), size + 1]; /* total increment */

    70

    }

    71

};

    72

    73

// Apply updates recieved through ws.onmessage to subscribed widgets

    74

function apply_updates() {

    75

    for(let index in updates){

    76

        // serving as a key, index becomes a string

    77

        // -> pass Number(index) instead

    78

        dispatch_value(Number(index), updates[index]);

    79

        delete updates[index];

    80

    }

    81

}

    82

    83

// Called on requestAnimationFrame, modifies DOM

    84

var requestAnimationFrameID = null;

    85

function animate() {

    86

    // Do the page swith if any one pending

    87

    if(current_subscribed_page != current_visible_page){

    88

        switch_visible_page(current_subscribed_page);

    89

    }

    90

    91

    while(widget = need_cache_apply.pop()){

    92

        widget.apply_cache();

    93

    }

    94

    95

    if(jumps_need_update) update_jumps();

    96

    97

    apply_updates();

    98

    requestAnimationFrameID = null;

    99

}

   100

   101

function requestHMIAnimation() {

   102

    if(requestAnimationFrameID == null){

   103

        requestAnimationFrameID = window.requestAnimationFrame(animate);

   104

    }

   105

}

   106

   107

// Message reception handler

   108

// Hash is verified and HMI values updates resulting from binary parsing

   109

// are stored until browser can compute next frame, DOM is left untouched

   110

ws.onmessage = function (evt) {

   111

   112

    let data = evt.data;

   113

    let dv = new DataView(data);

   114

    let i = 0;

   115

    try {

   116

        for(let hash_int of hmi_hash) {

   117

            if(hash_int != dv.getUint8(i)){

   118

                throw new Error("Hash doesn't match");

   119

            };

   120

            i++;

   121

        };

   122

   123

        while(i < data.byteLength){

   124

            let index = dv.getUint32(i, true);

   125

            i += 4;

   126

            let iectype = hmitree_types[index];

   127

            if(iectype != undefined){

   128

                let dvgetter = dvgetters[iectype];

   129

                let [value, bytesize] = dvgetter(dv,i);

   130

                updates[index] = value;

   131

                i += bytesize;

   132

            } else {

   133

                throw new Error("Unknown index "+index);

   134

            }

   135

        };

   136

        // register for rendering on next frame, since there are updates

   137

        requestHMIAnimation();

   138

    } catch(err) {

   139

        // 1003 is for "Unsupported Data"

   140

        // ws.close(1003, err.message);

   141

   142

        // TODO : remove debug alert ?

   143

        alert("Error : "+err.message+"\\\\nHMI will be reloaded.");

   144

   145

        // force reload ignoring cache

   146

        location.reload(true);

   147

    }

   148

};

   149

   150

   151

function send_blob(data) {

   152

    if(data.length > 0) {

   153

        ws.send(new Blob([new Uint8Array(hmi_hash)].concat(data)));

   154

    };

   155

};

   156

   157

const typedarray_types = {

   158

    INT: (number) => new Int16Array([number]),

   159

    BOOL: (truth) => new Int16Array([truth]),

   160

    NODE: (truth) => new Int16Array([truth]),

   161

    STRING: (str) => {

   162

        // beremiz default string max size is 128

   163

        str = str.slice(0,128);

   164

        binary = new Uint8Array(str.length + 1);

   165

        binary[0] = str.length;

   166

        for(var i = 0; i < str.length; i++){

   167

            binary[i+1] = str.charCodeAt(i);

   168

        }

   169

        return binary;

   170

    }

   171

    /* TODO */

   172

};

   173

   174

function send_reset() {

   175

    send_blob(new Uint8Array([1])); /* reset = 1 */

   176

};

   177

   178

// subscription state, as it should be in hmi server

   179

// hmitree indexed array of integers

   180

var subscriptions =  hmitree_types.map(_ignored => 0);

   181

   182

// subscription state as needed by widget now

   183

// hmitree indexed array of Sets of widgets objects

   184

var subscribers = hmitree_types.map(_ignored => new Set());

   185

   186

// artificially subscribe the watchdog widget to "/heartbeat" hmi variable

   187

// Since dispatch directly calls change_hmi_value,

   188

// PLC will periodically send variable at given frequency

   189

subscribers[heartbeat_index].add({

   190

    /* type: "Watchdog", */

   191

    frequency: 1,

   192

    indexes: [heartbeat_index],

   193

    dispatch: function(value) {

   194

        change_hmi_value(heartbeat_index, "+1");

   195

    }

   196

});

   197

   198

function update_subscriptions() {

   199

    let delta = [];

   200

    for(let index = 0; index < subscribers.length; index++){

   201

        let widgets = subscribers[index];

   202

   203

        // periods are in ms

   204

        let previous_period = subscriptions[index];

   205

   206

        // subscribing with a zero period is unsubscribing

   207

        let new_period = 0;

   208

        if(widgets.size > 0) {

   209

            let maxfreq = 0;

   210

            for(let widget of widgets)

   211

                if(maxfreq < widget.frequency)

   212

                    maxfreq = widget.frequency;

   213

   214

            if(maxfreq != 0)

   215

                new_period = 1000/maxfreq;

   216

        }

   217

   218

        if(previous_period != new_period) {

   219

            subscriptions[index] = new_period;

   220

            delta.push(

   221

                new Uint8Array([2]), /* subscribe = 2 */

   222

                new Uint32Array([index]),

   223

                new Uint16Array([new_period]));

   224

        }

   225

    }

   226

    send_blob(delta);

   227

};

   228

   229

function send_hmi_value(index, value) {

   230

    let iectype = hmitree_types[index];

   231

    let tobinary = typedarray_types[iectype];

   232

    send_blob([

   233

        new Uint8Array([0]),  /* setval = 0 */

   234

        new Uint32Array([index]),

   235

        tobinary(value)]);

   236

   237

    // DON'T DO THAT unless read_iterator in svghmi.c modifies wbuf as well, not only rbuf

   238

    // cache[index] = value;

   239

};

   240

   241

function apply_hmi_value(index, new_val) {

   242

    let old_val = cache[index]

   243

    if(new_val != undefined && old_val != new_val)

   244

        send_hmi_value(index, new_val);

   245

    return new_val;

   246

}

   247

   248

function change_hmi_value(index, opstr) {

   249

    let op = opstr[0];

   250

    let given_val = opstr.slice(1);

   251

    let old_val = cache[index]

   252

    let new_val;

   253

    switch(op){

   254

      case "=":

   255

        eval("new_val"+opstr);

   256

        break;

   257

      case "+":

   258

      case "-":

   259

      case "*":

   260

      case "/":

   261

        if(old_val != undefined)

   262

            new_val = eval("old_val"+opstr);

   263

        break;

   264

    }

   265

    if(new_val != undefined && old_val != new_val)

   266

        send_hmi_value(index, new_val);

   267

    return new_val;

   268

}

   269

   270

var current_visible_page;

   271

var current_subscribed_page;

   272

var current_page_index;

   273

   274

function prepare_svg() {

   275

    for(let eltid in detachable_elements){

   276

        let [element,parent] = detachable_elements[eltid];

   277

        parent.removeChild(element);

   278

    }

   279

};

   280

   281

function switch_page(page_name, page_index) {

   282

    if(current_subscribed_page != current_visible_page){

   283

        /* page switch already going */

   284

        /* TODO LOG ERROR */

   285

        return false;

   286

    }

   287

   288

    if(page_name == undefined)

   289

        page_name = current_subscribed_page;

   290

   291

   292

    let old_desc = page_desc[current_subscribed_page];

   293

    let new_desc = page_desc[page_name];

   294

   295

    if(new_desc == undefined){

   296

        /* TODO LOG ERROR */

   297

        return false;

   298

    }

   299

   300

    if(page_index == undefined){

   301

        page_index = new_desc.page_index;

   302

    }

   303

   304

    if(old_desc){

   305

        old_desc.absolute_widgets.map(w=>w.unsub());

   306

        old_desc.relative_widgets.map(w=>w.unsub());

   307

    }

   308

    new_desc.absolute_widgets.map(w=>w.sub());

   309

    var new_offset = page_index == undefined ? 0 : page_index - new_desc.page_index;

   310

    new_desc.relative_widgets.map(w=>w.sub(new_offset));

   311

   312

    update_subscriptions();

   313

   314

    current_subscribed_page = page_name;

   315

    current_page_index = page_index;

   316

   317

    jumps_need_update = true;

   318

   319

    requestHMIAnimation();

   320

   321

    jump_history.push([page_name, page_index]);

   322

    if(jump_history.length > 42)

   323

        jump_history.shift();

   324

   325

    return true;

   326

};

   327

   328

function* chain(a,b){

   329

    yield* a;

   330

    yield* b;

   331

};

   332

   333

function unsubscribe(){

   334

    /* remove subsribers */

   335

    for(let index of this.indexes){

   336

        let idx = index + this.offset;

   337

        subscribers[idx].delete(this);

   338

    }

   339

    this.offset = 0;

   340

}

   341

   342

function subscribe(new_offset=0){

   343

    /* set the offset because relative */

   344

    this.offset = new_offset;

   345

    /* add this's subsribers */

   346

    for(let index of this.indexes){

   347

        subscribers[index + new_offset].add(this);

   348

    }

   349

    need_cache_apply.push(this); 

   350

}

   351

   352

function widget_apply_cache() {

   353

    for(let index of this.indexes){

   354

        /* dispatch current cache in newly opened page widgets */

   355

        let realindex = index+this.offset;

   356

        let cached_val = cache[realindex];

   357

        if(cached_val != undefined)

   358

            dispatch_value_to_widget(this, realindex, cached_val, cached_val);

   359

    }

   360

}

   361

   362

function switch_visible_page(page_name) {

   363

   364

    let old_desc = page_desc[current_visible_page];

   365

    let new_desc = page_desc[page_name];

   366

   367

    if(old_desc){

   368

        for(let eltid in old_desc.required_detachables){

   369

            if(!(eltid in new_desc.required_detachables)){

   370

                let [element, parent] = old_desc.required_detachables[eltid];

   371

                parent.removeChild(element);

   372

            }

   373

        }

   374

        for(let eltid in new_desc.required_detachables){

   375

            if(!(eltid in old_desc.required_detachables)){

   376

                let [element, parent] = new_desc.required_detachables[eltid];

   377

                parent.appendChild(element);

   378

            }

   379

        }

   380

    }else{

   381

        for(let eltid in new_desc.required_detachables){

   382

            let [element, parent] = new_desc.required_detachables[eltid];

   383

            parent.appendChild(element);

   384

        }

   385

    }

   386

   387

    svg_root.setAttribute('viewBox',new_desc.bbox.join(" "));

   388

    current_visible_page = page_name;

   389

};

   390

   391

// Once connection established

   392

ws.onopen = function (evt) {

   393

    init_widgets();

   394

    send_reset();

   395

    // show main page

   396

    prepare_svg();

   397

    switch_page(default_page);

   398

};

   399

   400

ws.onclose = function (evt) {

   401

    // TODO : add visible notification while waiting for reload

   402

    console.log("Connection closed. code:"+evt.code+" reason:"+evt.reason+" wasClean:"+evt.wasClean+" Reload in 10s.");

   403

    // TODO : re-enable auto reload when not in debug

   404

    //window.setTimeout(() => location.reload(true), 10000);

   405

    alert("Connection closed. code:"+evt.code+" reason:"+evt.reason+" wasClean:"+evt.wasClean+".");

   406

   407

};

   408

   409

var xmlns = "http://www.w3.org/2000/svg";

   410

var edit_callback;

   411

function edit_value(path, valuetype, callback, initial) {

   412

   413

    let [keypadid, xcoord, ycoord] = keypads[valuetype];

   414

    console.log('XXX TODO : Edit value', path, valuetype, callback, initial, keypadid);

   415

    edit_callback = callback;

   416

    let widget = hmi_widgets[keypadid];

   417

    widget.start_edit(path, valuetype, callback, initial);

   418

};

   419

   420

var current_modal; /* TODO stack ?*/

   421

   422

function show_modal() {

   423

    let [element, parent] = detachable_elements[this.element.id];

   424

   425

    tmpgrp = document.createElementNS(xmlns,"g");

   426

    tmpgrpattr = document.createAttribute("transform");

   427

   428

    let [xcoord,ycoord] = this.coordinates;

   429

    let [xdest,ydest] = page_desc[current_visible_page].bbox;

   430

    tmpgrpattr.value = "translate("+String(xdest-xcoord)+","+String(ydest-ycoord)+")";

   431

    tmpgrp.setAttributeNode(tmpgrpattr);

   432

   433

    tmpgrp.appendChild(element);

   434

    parent.appendChild(tmpgrp);

   435

   436

    current_modal = [this.element.id, tmpgrp];

   437

};

   438

   439

function end_modal() {

   440

    let [eltid, tmpgrp] = current_modal;

   441

    let [element, parent] = detachable_elements[this.element.id];

   442

   443

    parent.removeChild(tmpgrp);

   444

   445

    current_modal = undefined;

   446

};

   447

   448

function widget_active_activable(eltsub) {

   449

    if(eltsub.inactive_style === undefined)

   450

        eltsub.inactive_style = eltsub.inactive.getAttribute("style");

   451

    eltsub.inactive.setAttribute("style", "display:none");

   452

    if(eltsub.active_style !== undefined)

   453

            eltsub.active.setAttribute("style", eltsub.active_style);

   454

    console.log("active", eltsub);

   455

};

   456

function widget_inactive_activable(eltsub) {

   457

    if(eltsub.active_style === undefined)

   458

        eltsub.active_style = eltsub.active.getAttribute("style");

   459

    eltsub.active.setAttribute("style", "display:none");

   460

    if(eltsub.inactive_style !== undefined)

   461

            eltsub.inactive.setAttribute("style", eltsub.inactive_style);

   462

    console.log("inactive", eltsub);

   463

};