1

// svghmi.js

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function dispatch_value(index, value) {

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    let widgets = subscribers(index);

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    let oldval = cache[index];

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    cache[index] = value;

     8

     9

    if(widgets.size > 0) {

    10

        for(let widget of widgets){

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            widget.new_hmi_value(index, value, oldval);

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        }

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    }

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};

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function init_widgets() {

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

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        let widget = hmi_widgets[id];

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        widget.do_init();

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    });

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};

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// Open WebSocket to relative "/ws" address

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var has_watchdog = window.location.hash == "#watchdog";

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const dvgetters = {

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

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

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    DINT:  (dv,offset) => [dv.getInt32(offset, true), 4],

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    LINT:  (dv,offset) => [dv.getBigInt64(offset, true), 8],

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    USINT: (dv,offset) => [dv.getUint8(offset, true), 1],

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    UINT:  (dv,offset) => [dv.getUint16(offset, true), 2],

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    UDINT: (dv,offset) => [dv.getUint32(offset, true), 4],

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    ULINT: (dv,offset) => [dv.getBigUint64(offset, true), 8],

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

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

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    REAL:  (dv,offset) => [dv.getFloat32(offset, true), 4],

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    STRING: (dv, offset) => {

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        const size = dv.getInt8(offset);

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        return [

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            String.fromCharCode.apply(null, new Uint8Array(

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                dv.buffer, /* original buffer */

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

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                size /* size of string */

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

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    }

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};

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// Called on requestAnimationFrame, modifies DOM

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var requestAnimationFrameID = null;

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function animate() {

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    let rearm = true;

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    do{

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        if(page_fading == "pending" || page_fading == "forced"){

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            if(page_fading == "pending")

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                svg_root.classList.add("fade-out-page");

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            page_fading = "in_progress";

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            if(page_fading_args.length)

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                setTimeout(function(){

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                    switch_page(...page_fading_args);

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                },1);

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            break;

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        }

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        // Do the page swith if pending

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        if(page_switch_in_progress){

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            if(current_subscribed_page != current_visible_page){

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                switch_visible_page(current_subscribed_page);

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            }

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            page_switch_in_progress = false;

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            if(page_fading == "in_progress"){

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                svg_root.classList.remove("fade-out-page");

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                page_fading = "off";

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            }

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        }

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        if(jumps_need_update) update_jumps();

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        pending_widget_animates.forEach(widget => widget._animate());

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        pending_widget_animates = [];

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        rearm = false;

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    } while(0);

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    requestAnimationFrameID = null;

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    if(rearm) requestHMIAnimation();

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}

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function requestHMIAnimation() {

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    if(requestAnimationFrameID == null){

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        requestAnimationFrameID = window.requestAnimationFrame(animate);

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    }

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}

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// Message reception handler

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

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

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function ws_onmessage(evt) {

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    let data = evt.data;

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    let dv = new DataView(data);

   105

    let i = 0;

   106

    try {

   107

        for(let hash_int of hmi_hash) {

   108

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

   109

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

   110

            };

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            i++;

   112

        };

   113

   114

        while(i < data.byteLength){

   115

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

   116

            i += 4;

   117

            let iectype = hmitree_types[index];

   118

            if(iectype != undefined){

   119

                let dvgetter = dvgetters[iectype];

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

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                dispatch_value(index, value);

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                i += bytesize;

   123

            } else {

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

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            }

   126

        };

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   128

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

   129

    } catch(err) {

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        // 1003 is for "Unsupported Data"

   131

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

   132

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        // TODO : remove debug alert ?

   134

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

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        // force reload ignoring cache

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        location.reload(true);

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    }

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};

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   141

hmi_hash_u8 = new Uint8Array(hmi_hash);

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   143

var ws = null;

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function send_blob(data) {

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    if(data.length > 0 && ws && ws.readyState == WebSocket.OPEN) {

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        ws.send(new Blob([hmi_hash_u8].concat(data)));

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    };

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};

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const typedarray_types = {

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    SINT: (number) => new Int8Array([number]),

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

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    DINT: (number) => new Int32Array([number]),

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    LINT: (number) => new Int64Array([number]),

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    USINT: (number) => new Uint8Array([number]),

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    UINT: (number) => new Uint16Array([number]),

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    UDINT: (number) => new Uint32Array([number]),

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    ULINT: (number) => new Uint64Array([number]),

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    BOOL: (truth) => new Int8Array([truth]),

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    NODE: (truth) => new Int8Array([truth]),

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    REAL: (number) => new Float32Array([number]),

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    STRING: (str) => {

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        // beremiz default string max size is 128

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        str = str.slice(0,128);

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

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        binary[0] = str.length;

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

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

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        }

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        return binary;

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    }

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    /* TODO */

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};

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function send_reset() {

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

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};

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var subscriptions = [];

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var subscriptions_update_requested = false;

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function subscribers(index) {

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    let entry = subscriptions[index];

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    let res;

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    if(entry == undefined){

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        res = new Set();

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        subscriptions[index] = [res,0];

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    }else{

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        [res, _ign] = entry;

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    }

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    return res

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}

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function get_subscription_period(index) {

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    let entry = subscriptions[index];

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    if(entry == undefined)

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        return 0;

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    let [_ign, period] = entry;

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    return period;

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}

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function set_subscription_period(index, period) {

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    let entry = subscriptions[index];

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    if(entry == undefined){

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        subscriptions[index] = [new Set(), period];

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    } else {

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        entry[1] = period;

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    }

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}

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function reset_subscription_periods() {

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    for(let index in subscriptions)

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        subscriptions[index][1] = 0;

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}

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if(has_watchdog){

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

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    // Since dispatch directly calls change_hmi_value,

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    // PLC will periodically send variable at given frequency

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    subscribers(heartbeat_index).add({

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        /* type: "Watchdog", */

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        frequency: 1,

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        indexes: [heartbeat_index],

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        new_hmi_value: function(index, value, oldval) {

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            apply_hmi_value(heartbeat_index, value+1);

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        }

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    });

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}

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var page_fading = "off";

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var page_fading_args = "off";

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function fading_page_switch(...args){

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    if(page_fading == "in_progress")

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        page_fading = "forced";

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    else

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        page_fading = "pending";

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    page_fading_args = args;

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   241

    requestHMIAnimation();

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   243

}

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document.body.style.backgroundColor = "black";

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// subscribe to per instance current page hmi variable

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// PLC must prefix page name with "!" for page switch to happen

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subscribers(current_page_var_index).add({

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    frequency: 1,

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    indexes: [current_page_var_index],

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    new_hmi_value: function(index, value, oldval) {

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        if(value.startsWith("!"))

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            fading_page_switch(value.slice(1));

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    }

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});

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   257

function svg_text_to_multiline(elt) {

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    return(Array.prototype.map.call(elt.children, x=>x.textContent).join("\\\\n")); 

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}

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function multiline_to_svg_text(elt, str, blank) {

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    str.split('\\\\n').map((line,i) => {elt.children[i].textContent = blank?"":line;});

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}

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function switch_langnum(langnum) {

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    langnum = Math.max(0, Math.min(langs.length - 1, langnum));

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    for (let translation of translations) {

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        let [objs, msgs] = translation;

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        let msg = msgs[langnum];

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        for (let obj of objs) {

   272

            multiline_to_svg_text(obj, msg);

   273

            obj.setAttribute("lang",langnum);

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        }

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    }

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    return langnum;

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}

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   279

// backup original texts

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for (let translation of translations) {

   281

    let [objs, msgs] = translation;

   282

    msgs.unshift(svg_text_to_multiline(objs[0])); 

   283

}

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var lang_local_index = hmi_local_index("lang");

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var langcode_local_index = hmi_local_index("lang_code");

   287

var langname_local_index = hmi_local_index("lang_name");

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subscribers(lang_local_index).add({

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    indexes: [lang_local_index],

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    new_hmi_value: function(index, value, oldval) {

   291

        let current_lang =  switch_langnum(value);

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        let [langname,langcode] = langs[current_lang];

   293

        apply_hmi_value(langcode_local_index, langcode);

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        apply_hmi_value(langname_local_index, langname);

   295

        switch_page();

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    }

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});

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// returns en_US, fr_FR or en_UK depending on selected language

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function get_current_lang_code(){

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    return cache[langcode_local_index];

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}

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function setup_lang(){

   305

    let current_lang = cache[lang_local_index];

   306

    let new_lang = switch_langnum(current_lang);

   307

    if(current_lang != new_lang){

   308

        apply_hmi_value(lang_local_index, new_lang);

   309

    }

   310

}

   311

   312

setup_lang();

   313

   314

function update_subscriptions() {

   315

    let delta = [];

   316

   317

    subscriptions_update_requested = false;

   318

   319

    if(!ws || ws.readyState != WebSocket.OPEN)

   320

        // dont' change subscriptions if not connected

   321

        return;

   322

   323

    for(let index in subscriptions){

   324

        let widgets = subscribers(index);

   325

   326

        // periods are in ms

   327

        let previous_period = get_subscription_period(index);

   328

   329

        // subscribing with a zero period is unsubscribing

   330

        let new_period = 0;

   331

        if(widgets.size > 0) {

   332

            let maxfreq = 0;

   333

            for(let widget of widgets){

   334

                let wf = widget.frequency;

   335

                if(wf != undefined && maxfreq < wf)

   336

                    maxfreq = wf;

   337

            }

   338

   339

            if(maxfreq != 0)

   340

                new_period = 1000/maxfreq;

   341

        }

   342

   343

        if(previous_period != new_period) {

   344

            set_subscription_period(index, new_period);

   345

            if(index <= last_remote_index){

   346

                delta.push(

   347

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

   348

                    new Uint32Array([index]),

   349

                    new Uint16Array([new_period]));

   350

            }

   351

        }

   352

    }

   353

    send_blob(delta);

   354

};

   355

   356

function request_subscriptions_update(){

   357

    if(!subscriptions_update_requested){

   358

        subscriptions_update_requested = true;

   359

        Promise.resolve().then(update_subscriptions);

   360

    }

   361

}

   362

   363

   364

function send_hmi_value(index, value) {

   365

    if(index > last_remote_index){

   366

        dispatch_value(index, value);

   367

   368

        if(persistent_indexes.has(index)){

   369

            let varname = persistent_indexes.get(index);

   370

            document.cookie = varname+"="+value+"; max-age=3153600000";

   371

        }

   372

   373

        return;

   374

    }

   375

   376

    let iectype = hmitree_types[index];

   377

    let tobinary = typedarray_types[iectype];

   378

    send_blob([

   379

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

   380

        new Uint32Array([index]),

   381

        tobinary(value)]);

   382

   383

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

   384

    // cache[index] = value;

   385

};

   386

   387

function apply_hmi_value(index, new_val) {

   388

    // Similarly to previous comment, taking decision to update based 

   389

    // on cache content is bad and can lead to inconsistency

   390

    /*let old_val = cache[index];*/

   391

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

   392

        send_hmi_value(index, new_val);

   393

    return new_val;

   394

}

   395

   396

const quotes = {"'":null, '"':null};

   397

   398

function eval_operation_string(old_val, opstr) {

   399

    let op = opstr[0];

   400

    let given_val;

   401

    if(opstr.length < 2) 

   402

        return undefined;

   403

    if(opstr[1] in quotes){

   404

        if(opstr.length < 3) 

   405

            return undefined;

   406

        if(opstr[opstr.length-1] == opstr[1]){

   407

            given_val = opstr.slice(2,opstr.length-1);

   408

        }

   409

    } else {

   410

        given_val = Number(opstr.slice(1));

   411

    }

   412

    let new_val;

   413

    switch(op){

   414

      case "=":

   415

        new_val = given_val;

   416

        break;

   417

      case "+":

   418

        new_val = old_val + given_val;

   419

        break;

   420

      case "-":

   421

        new_val = old_val - given_val;

   422

        break;

   423

      case "*":

   424

        new_val = old_val * given_val;

   425

        break;

   426

      case "/":

   427

        new_val = old_val / given_val;

   428

        break;

   429

    }

   430

    return new_val;

   431

}

   432

   433

var current_visible_page;

   434

var current_subscribed_page;

   435

var current_page_index;

   436

var page_node_local_index = hmi_local_index("page_node");

   437

var page_switch_in_progress = false;

   438

   439

function toggleFullscreen() {

   440

  let elem = document.documentElement;

   441

   442

  if (!document.fullscreenElement) {

   443

    elem.requestFullscreen().catch(err => {

   444

      console.log("Error attempting to enable full-screen mode: "+err.message+" ("+err.name+")");

   445

    });

   446

  } else {

   447

    document.exitFullscreen();

   448

  }

   449

}

   450

   451

// prevents context menu from appearing on right click and long touch

   452

document.body.addEventListener('contextmenu', e => {

   453

    toggleFullscreen();

   454

    e.preventDefault();

   455

});

   456

   457

if(screensaver_delay){

   458

    var screensaver_timer = null;

   459

    function reset_screensaver_timer() {

   460

        if(screensaver_timer){

   461

            window.clearTimeout(screensaver_timer);

   462

        }

   463

        screensaver_timer = window.setTimeout(() => {

   464

            switch_page("ScreenSaver");

   465

            screensaver_timer = null;

   466

        }, screensaver_delay*1000);

   467

    }

   468

    document.body.addEventListener('pointerdown', reset_screensaver_timer);

   469

    // initialize screensaver

   470

    reset_screensaver_timer();

   471

}

   472

   473

   474

function detach_detachables() {

   475

   476

    for(let eltid in detachable_elements){

   477

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

   478

        parent.removeChild(element);

   479

    }

   480

};

   481

   482

function switch_page(page_name, page_index) {

   483

    if(page_switch_in_progress){

   484

        /* page switch already going */

   485

        /* TODO LOG ERROR */