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// widget_jsontable.ysl2

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    ||

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        // arbitrary defaults to avoid missing entries in query

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        cache = [0,0,0];

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        init_common() {

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            this.spread_json_data_bound = this.spread_json_data.bind(this);

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            this.handle_http_response_bound = this.handle_http_response.bind(this);

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            this.fetch_error_bound = this.fetch_error.bind(this);

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            this.promised = false;

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        }

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        handle_http_response(response) {

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            if (!response.ok) {

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              console.log("HTTP error, status = " + response.status);

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            }

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            return response.json();

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        }

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        fetch_error(e){

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            console.log("HTTP fetch error, message = " + e.message + "Widget:" + this.element_id);

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        }

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        do_http_request(...opt) {

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            this.abort_controller = new AbortController();

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            return Promise.resolve().then(() => {

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                const query = {

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                    args: this.args,

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                    range: this.cache[1],

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                    position: this.cache[2],

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                    visible: this.visible,

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                    extra: this.cache.slice(4),

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                    options: opt

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                };

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                const options = {

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                     method: 'POST',

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                     body: JSON.stringify(query),

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                     headers: {'Content-Type': 'application/json'},

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                     signal: this.abort_controller.signal

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                };

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                return fetch(this.args[0], options)

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                        .then(this.handle_http_response_bound)

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                        .then(this.spread_json_data_bound)

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                        .catch(this.fetch_error_bound);

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            });

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        }

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        unsub(){

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            this.abort_controller.abort();

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            super.unsub();

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        }

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        sub(...args){

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            this.cache[0] = undefined;

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            super.sub(...args);

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        }

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        dispatch(value, oldval, index) {

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            if(this.cache[index] != value)

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                this.cache[index] = value;

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            else

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                return;

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            if(!this.promised){

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                this.promised = true;

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                this.do_http_request().finally(() => {

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                    this.promised = false;

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                });

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            }

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        }

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        make_on_click(...options){

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            let that = this;

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            return function(evt){

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                that.do_http_request(...options);

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            }

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        }

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        // on_click(evt, ...options) {

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        //     this.do_http_request(...options);

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        // }

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    ||

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template "svg:*", mode="json_table_elt_render" {

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    error > JsonTable Widget can't contain element of type «local-name()».

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}

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const "hmi_textstylelists_descs", "$parsed_widgets/widget[@type = 'TextStyleList']";

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const "hmi_textstylelists", "$hmi_elements[@id = $hmi_textstylelists_descs/@id]";

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const "textstylelist_related" foreach "$hmi_textstylelists" list {

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    attrib "listid" value "@id";

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    foreach "func:refered_elements(.)" elt {

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        attrib "eltid" value "@id";

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    }

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}

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const "textstylelist_related_ns", "exsl:node-set($textstylelist_related)";

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def "func:json_expressions" {

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    param "expressions";

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    param "label";

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    // compute javascript expressions to access JSON data

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    // desscribed in given svg element's "label"

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    // knowing that parent element already has given "expressions".

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    choose {

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        when "$label" {

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            const "suffixes", "str:split($label)";

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            const "res" foreach "$suffixes" expression {

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                const "suffix",".";

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                const "pos","position()";

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                // take last available expression (i.e can have more suffixes than expressions)

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                const "expr","$expressions[position() <= $pos][last()]/expression";

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                choose {

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                    when "contains($suffix,'=')" {

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                        const "name", "substring-before($suffix,'=')";

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                        if "$expr/@name[. != $name]"

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                            error > JsonTable : missplaced '=' or inconsistent names in Json data expressions.

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                        attrib "name" value "$name";

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                        attrib "content" > «$expr/@content»«substring-after($suffix,'=')»

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                    }

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                    otherwise {

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                        copy "$expr/@name";

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                        attrib "content" > «$expr/@content»«$suffix»

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                    }

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                }

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            }

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            result "exsl:node-set($res)";

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        }

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        // Empty labels are ignored, expressions are then passed as-is.

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        otherwise result "$expressions";

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    }

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}

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const "initexpr" expression attrib "content" > jdata

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const "initexpr_ns", "exsl:node-set($initexpr)";

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template "svg:use", mode="json_table_elt_render" {

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    param "expressions";

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    // cloned element must be part of a HMI:List

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    const "targetid", "substring-after(@xlink:href,'#')";

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    const "from_list", "$hmi_lists[(@id | */@id) = $targetid]";

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    choose {

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        when "count($from_list) > 0" {

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            |         id("«@id»").setAttribute("xlink:href",

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            // obtain new target id from HMI:List widget

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            |             "#"+hmi_widgets["«$from_list/@id»"].items[«$expressions/expression[1]/@content»]);

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        }

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        otherwise

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            warning > Clones (svg:use) in JsonTable Widget must point to a valid HMI:List widget or item. Reference "«@xlink:href»" is not valid and will not be updated.

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    }

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}

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template "svg:text", mode="json_table_elt_render" {

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    param "expressions";

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    const "value_expr", "$expressions/expression[1]/@content";

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    const "original", "@original";

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    const "from_textstylelist", "$textstylelist_related_ns/list[elt/@eltid = $original]";

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    choose {

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        when "count($from_textstylelist) > 0" {

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            const "content_expr", "$expressions/expression[2]/@content";

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            if "string-length($content_expr) = 0 or $expressions/expression[2]/@name != 'textContent'"

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                error > Clones (svg:use) in JsonTable Widget pointing to a HMI:TextStyleList widget or item must have a "textContent=.someVal" assignement following value expression in label.

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            |         {

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            |           let elt = id("«@id»");

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            |           elt.textContent = String(«$content_expr»);

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            |           elt.style = hmi_widgets["«$from_textstylelist/@listid»"].styles[«$value_expr»];

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            |         }

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        }

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        otherwise {

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            |         id("«@id»").textContent = String(«$value_expr»);

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        }

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    }

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}

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// only labels comming from Json widget are counted in

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def "func:filter_non_widget_label" {

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    param "elt";

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    param "widget_elts";

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    const "eltid" choose {

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        when "$elt/@original" value "$elt/@original";

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        otherwise value "$elt/@id";

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    }

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    result "$widget_elts[@id=$eltid]/@inkscape:label";

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}

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template "svg:*", mode="json_table_render_except_comments"{

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    param "expressions";

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    param "widget_elts";

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    const "label", "func:filter_non_widget_label(., $widget_elts)";

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    // filter out "# commented" elements

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    if "not(starts-with($label,'#'))" 

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        apply ".", mode="json_table_render"{

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            with "expressions", "$expressions";

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            with "widget_elts", "$widget_elts";

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            with "label", "$label";

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        }

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}

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template "svg:*", mode="json_table_render" {

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    param "expressions";

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    param "widget_elts";

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    param "label";

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    const "new_expressions", "func:json_expressions($expressions, $label)";

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    const "elt",".";

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    foreach "$new_expressions/expression[position() > 1][starts-with(@name,'onClick')]"

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    |         id("«$elt/@id»").onclick = this.make_on_click('«@name»', «@content»);

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    apply ".", mode="json_table_elt_render"

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        with "expressions", "$new_expressions";

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}

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template "svg:g", mode="json_table_render" {

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    param "expressions";

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    param "widget_elts";

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    param "label";

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    // use intermediate variables for optimization

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    const "varprefix" > obj_«@id»_

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    |         try {

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    foreach "$expressions/expression"{

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    |          let «$varprefix»«position()» = «@content»;

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    |          if(«$varprefix»«position()» == undefined) {

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    |               throw null;

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    |          }

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    }

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    // because we put values in a variables, we can replace corresponding expression with variable name

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    const "new_expressions" foreach "$expressions/expression" xsl:copy {

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        copy "@name";

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        attrib "content" > «$varprefix»«position()»

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    }

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    // revert hiding in case it did happen before

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    |           id("«@id»").style = "«@style»";

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    apply "*", mode="json_table_render_except_comments" {

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        with "expressions", "func:json_expressions(exsl:node-set($new_expressions), $label)";

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        with "widget_elts", "$widget_elts";

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    }

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    |         } catch(err) {

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    |           id("«@id»").style = "display:none";

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    |         }

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}

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    param "hmi_element";

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    labels("data");

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    const "data_elt", "$result_svg_ns//*[@id = $hmi_element/@id]/*[@inkscape:label = 'data']";

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    |     visible: «count($data_elt/*[@inkscape:label])»,

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    |     spread_json_data: function(janswer) {

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    |         let [range,position,jdata] = janswer;

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    |         [[1, range], [2, position], [3, this.visible]].map(([i,v]) => {

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    |              this.apply_hmi_value(i,v);

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    |              this.cache[i] = v;

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    |         });

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    apply "$data_elt", mode="json_table_render_except_comments" {

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        with "expressions","$initexpr_ns";

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        with "widget_elts","$hmi_element/*[@inkscape:label = 'data']/descendant::svg:*";

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    }

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    |     },

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    |     init() {

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    |        this.init_common();

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    foreach "$hmi_element/*[starts-with(@inkscape:label,'action_')]" {

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    |         id("«@id»").onclick = this.make_on_click("«func:escape_quotes(@inkscape:label)»");

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    }

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    |     }

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}