package_search.js

(function() {

    if (!!document.getElementById('package-search-results')){

        // Load packages from JSON asynchronously
        fortranLang.loadJSON(fortranLang.baseurl+'/packages/package_index.json', search);

    }
    

    
    function search(data){
        // Called after json data is loaded
        
        projects = data.projects;
	    
        // In the earlier code there has been an error in the regex implemented in  function fortranLang.findGetParameter('query')
	// Opened a new Issue for this  #388   
	    
        var url = new URL(window.location.href); //converts the url from index page and extracts the parameter "query" 
       
        // Get search string
        var queryString = url.searchParams.get("query");

        document.getElementById('search-query').value = queryString;

        results = searchProjects(queryString,projects);
        resultsHTML = resultsToHTML(results);
        document.getElementById('package-search-results').innerHTML = resultsHTML;

    }

    function getSubSentences(sentence) {
        // Return all permutations of contiguous sub sentences from a sentence
        var words = sentence.split(" ");
    
        var subs = [];
    
        var N = words.length;
    
        var i;
        for (i = 1; i <= N; i++){ // Loop over possible sentence lengths
    
            var j;
            for (j=0; j<=(N-i); j++){ // Loop over sentence locations
    
                sub_i = words.slice(j,j+i);
                subs.push(sub_i.join(" "));
    
            }
    
        }
    
        return subs;
    
    }
    

    function searchProjects(queryString,projects) {
        // Basic sub-string matching within project fields
        //
        //  Results ranked by size of matched sub-string and field weight
        //
        var subs = getSubSentences(queryString);
    
        // Sort by subsentence length descending
        subs = subs.sort(function(a,b){return b.split(" ").length - a.split(" ").length})
    
        var fields = ['name','description','tags','license','github','gitlab','url'];
        var fieldWeights = [10.0,1.0,1.0,0.1,1.0,1.0,0.1];
    
        // Loop over projects JSON
        var i;
        for (i = 0; i<projects.length; i++){
    
            var j;
    
            projects[i].score = 0;
    
            var subMatch = [];
            for (j=0; j<subs.length; j++){
                subMatch[j] = false;
            }        
    
            for (j=0; j<fields.length; j++){
    
                var k;
                for (k=0; k<subs.length; k++){
    
                    if (subMatch[k]){
                        // Don't match a sub-sentence more than once per project
                        continue;
                    }
    
                    fieldData = projects[i][fields[j]].toLowerCase();
                    querySubString = subs[k].toLowerCase();
                    queryStringLength = querySubString.split(" ").length;
    
                    if (fieldData.includes(querySubString)){
    
                        subMatch[k] = true;
                        projects[i].score += fieldWeights[j]*queryStringLength;
                        break;
    
                    }
    
                }
    
            }
    
        }
    
        return projects.sort(function(a,b){return b.score - a.score});
    
    }
    

    function resultsToHTML(results){
        // Return HTML representation of search results
        //
    
        var out = "";
        var i;
        for (i=0;i<results.length;i++){
        
            if (results[i].score > 0){
        
                project = results[i];
        
                if (results[i].github != "" && !project.fpm){
                    out += '<h3><a href="https://github.com/'+project.github+'" target="_blank">';
                    out += '<i class="devicon-github-plain colored"></i> '+project.name+'</a></h3>';
                } else if (results[i].gitlab != "" && !project.fpm){
                    out += '<h3><a href="https://gitlab.com/'+results[i].gitlab+'" target="_blank">';
                    out += '<i class="devicon-gitlab-plain colored"></i> '+project.name+'</a></h3>';
                } else {
                    out += '<h3><a href="'+project.url+'" target="_blank">';
                    if (project.fpm){
                        out += '<i class="fas fa-cubes"></i> ';
                    } else if (project.url.includes('gitlab.com')) {
                        out += '<i class="devicon-gitlab-plain colored"></i> ';
                    } else if (project.url.includes('bitbucket.org')){
                        out += '<i class="devicon-bitbucket-plain colored"></i> ';
                    }
                    out += project.name+'</a></h3>';
                }
                
                out += '<p> '+project.description;
    
                var cats = project.categories.split(" ");
                out += ' ('
                var j;
                for (j=0;j<cats.length;j++){
                    out += '<a href="'+fortranLang.baseurl+'/packages/'+cats[j]+'">'+cats[j]+'</a>';
                    if (j<cats.length-1){
                        out += ', ';
                    }
                }
                out += ') </p>'
                
                
    
                out += '<p class="light small"><b>Tags: </b>'+project.tags+'</p>';
        
            }
        
        }
        
        return out;
    
    }

})();