Metadata-json NPM

Metadata-JSON

metadata-json is a framework for metadata encoded in a simple JSON format (.mdj file) typically created by StarUML.

Getting Started

Installation

You can simply install via npm.

$ npm install metadata-json

IMPORTANT
This metadata-json uses node-canvas module in order to generate image files (PNG and SVG). If you need to export images, you have to install Cairo first before installing this module (To installing Cairo on various platforms, please refer to https://github.com/Automattic/node-canvas). If you don't need to export images, ignore installation errors from node-canvas.

Load a model file

To load a model file (.mdj), call loadFromFile function with a file path. It returns the root element (typically an instanceof Project). You can also get the root element by getRoot function.

var mdjson = require("metadata-json");

var root = mdjson.loadFromFile("test.mdj");
console.log(root);
console.log(mdjson.getRoot()); // equivalent

Generate code using EJS template

Generate a single file

If you want to generate code with a EJS template, you can do by calling render function.

var mdjson = require("metadata-json");

mdjson.loadFromFile("test.mdj");
mdjson.render("template.ejs", "out.html", mdjson.getRoot()); // out.html file generated.

Here is the content of template.ejs file.

<html>
  <head>
    <title><%= element.name %></title>
  </head>
  <body>
    <h1><%= element.name %></h1>
    <h3>Description</h3>
    <div><%-: element.documentation | markdown %></div>
    <h3>Children</h3>
    <ul>
    <% element.getChildren().forEach(function (e) { %>
        <li><%= e.name %></li>
    <% }); %>
    </ul>
  </body>
</html>

In template, you can use the following variables. If you want to pass additional variables, add them to options, the fourth parameter of render.

element : the element passed as the third parameter of render function.
mdjson : reference to metadata-json module.
filename : file name of the template file.
root : the root element. It equals to mdjson.getRoot().

Generate multiple files

If you want to render a set of elements with a same template, you can do by calling renderBulk function. You can pass array of elements or selector expression (string) to the third parameter of renderBulk. To save each rendered data with different file name, you can also use EJS template syntax in the output file name.

var mdjson = require("metadata-json");

mdjson.loadFromFile("test.mdj");
mdjson.renderBulk("template.ejs", "<%= element.name %>.html", "@UMLPackage");

Use filters

You can define filters to be used in templates.

var myFilters = {
    attributeExpression: function (e) {
        return e.name + " : " + e.type + " = " + e.defaultValue;
    }
};
mdjson.render("template.ejs", "out.html", attr, { filters: myFilters }); // out.html file generated.

In template, you can use the filters you defined.

...
<%=: element | attributeExpression %>
...

Predefined filters

EJS provides several predefined filters and additionally following filters are defined in metadata-json so you can use them in your EJS templates.

filename : convert string to possible filename in Windows.
markdown : render markdown syntax to HTML.

Export Diagrams to Images (PNG, SVG)

This featrure requires Cairo installation. Read the above installation section.

You can export diagrams to two image formats: PNG and SVG.

var mdjson = require("metadata-json");

mdjson.loadFromFile("diagram_test.mdj");

// Retrive all diagrams
var diagrams = mdjson.Repository.getInstancesOf("Diagram");

// Export all diagrams to PNG and SVG
diagrams.forEach(function (d) {
    mdjson.exportDiagramAsPNG(d, d.name + ".png");
    mdjson.exportDiagramAsSVG(d, d.name + ".svg");
});

If you want to export a set of diagrams at once, you can do by calling exportDiagramBulk function. You can pass array of diagrams or selector expression (string) to the first parameter of exportDiagramBulk. To save each diagram image with different file name, you can also use EJS template syntax in the file name.

var mdjson = require("metadata-json");

mdjson.loadFromFile("diagram_test.mdj");

// Retrive all diagrams
var diagrams = mdjson.Repository.getInstancesOf("Diagram");

// Export all diagrams as PNG
mdjson.exportDiagramBulk(diagrams, "images/<%=diagram.name%>.png", "png");

Export Diagrams to PDF

You can export diagrams to a PDF document. Each diagram will be rendered as a page. Supported options are as follow:

size: 4A0, 2A0, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, RA0, RA1, RA2, RA3, RA4, SRA0, SRA1, SRA2, SRA3, SRA4, Executive, Folio, Legal, Letter, Tabloid.
layout: "landscape" or "portrait"
showName: Whether show diagram path name on the top of the page or not.

var mdjson = require("metadata-json");

mdjson.loadFromFile("diagram_test.mdj");

// Retrive all diagrams
var diagrams = mdjson.Repository.getInstancesOf("Diagram");

// Options for PDF export
var options = {
    size: "A4",
    layout: "landscape",
    showName: true
};

mdjson.exportToPDF(diagrams, "out.pdf", options);

Export HTML document

This featrure may requires Cairo installation if you want to generate diagram images. Read the above installation section.

You can generate HTML documents by using exportToHTML. First parameter is output folder name and second parameter inidcates whether generate diagram images or not.

var mdjson = require('metadata-json');
mdjson.loadFromFile("diagram_test.mdj");
mdjson.exportToHTML("html-out", true); // Generate diagram images

fs-extra requirejs underscore pdfkit ejs markdown escape-html canvas

@xkeyio/infrastructure-generator @xkeyio/geninfra @everything-registry/sub-chunk-2159 mdgen @infinitebrahmanuniverse/nolb-metad

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