// parse_labels.ysl2


//  Parses:
//  "HMI:WidgetType:param1:param2@path1,path1min,path1max@path2"
//
//  Into:
//  widget type="WidgetType" id="blah456" {
//      arg value="param1";
//      arg value="param2";
//      path value=".path1" index=".path1" min="path1min" max="path1max" type="PAGE_LOCAL";
//      path value="/path1" index="348" type="HMI_INT";
//      path value="path4" index="path4" type="HMI_LOCAL";
//  }
//
const "pathregex",!"'^([^\[,]+)(\[[^\]]+\])?([\d,]*)$'"!;

template "*", mode="parselabel" 
{
    const "label","@inkscape:label";
    const "id","@id";
    const "description", "substring-after($label,'HMI:')";

    const "_args", "substring-before($description,'@')";
    const "args" choose {
        when "$_args" value "$_args";
        otherwise value "$description";
    }

    const "_type", "substring-before($args,':')";
    const "type" choose {
        when "$_type" value "$_type";
        otherwise value "$args";
    }

    if "$type" widget {
        attrib "id" > «$id»
        attrib "type" > «$type»
        foreach "str:split(substring-after($args, ':'), ':')" {
            arg {
                attrib "value" > «.»
            }
        }
        const "paths", "substring-after($description,'@')";
        foreach "str:split($paths, '@')" {
            if "string-length(.) > 0" path {
                // 1 : global match
                // 2 : /path
                // 3 : [accepts]
                // 4 : min,max
                const "path_match", "regexp:match(.,$pathregex)";
                const "pathminmax", "str:split($path_match[4],',')";
                const "path", "$path_match[2]";
                const "path_accepts", "$path_match[3]";
                const "pathminmaxcount", "count($pathminmax)";
                attrib "value" > «$path»
                if "string-length($path_accepts)"
                    attrib "accepts" > «$path_accepts»
                choose {
                    when "$pathminmaxcount = 2" {
                        attrib "min" > «$pathminmax[1]»
                        attrib "max" > «$pathminmax[2]»
                    }
                    when "$pathminmaxcount = 1 or $pathminmaxcount > 2" {
                        error > Widget id:«$id» label:«$label» has wrong syntax of path section «$pathminmax»
                    }
                }
                if "$indexed_hmitree" choose {
                    when "regexp:test($path,'^\.[a-zA-Z0-9_]+$')" {
                        attrib "type" > PAGE_LOCAL
                    }
                    when "regexp:test($path,'^[a-zA-Z0-9_]+$')" {
                        attrib "type" > HMI_LOCAL
                    }
                    otherwise {
                        const "item", "$indexed_hmitree/*[@hmipath = $path]";
                        const "pathtype", "local-name($item)";
                        if "$pathminmaxcount = 3 and not($pathtype = 'HMI_INT' or $pathtype = 'HMI_REAL')" {
                            error > Widget id:«$id» label:«$label» path section «$pathminmax» use min and max on non mumeric value
                        }
                        if "count($item) = 1" {
                            attrib "index" > «$item/@index»
                            attrib "type" > «$pathtype»
                        }
                    }
                }
            }
        }
    }
}


// Templates to generate label back from parsed tree
template "arg", mode="genlabel" > :«@value»

template "path", mode="genlabel" {
    > @«@value»
    if "string-length(@min)>0 or string-length(@max)>0"  > ,«@min»,«@max»
}

template "widget", mode="genlabel" {
    > HMI:«@type»
    apply "arg", mode="genlabel";
    apply "path", mode="genlabel";
}