First steps on work with sequence diagrams.

src/graphDb.js

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+/**
+ * Created by knut on 14-11-03.
+ */
+
+var vertices = {};
+var edges = [];
+var direction;
+/**
+ * Function called by parser when a node definition has been found
+ * @param id
+ * @param text
+ * @param type
+ * @param style
+ */
+exports.addVertex = function (id, text, type, style) {
+    console.log('Got node ' + id + ' ' + type + ' ' + text + ' styles: ' + JSON.stringify(style));
+    if (typeof vertices[id] === 'undefined') {
+        vertices[id] = {id: id, styles: []};
+    }
+    if (typeof text !== 'undefined') {
+        vertices[id].text = text;
+    }
+    if (typeof type !== 'undefined') {
+        vertices[id].type = type;
+    }
+    if (typeof style !== 'undefined') {
+        if (style !== null) {
+            style.forEach(function (s) {
+                vertices[id].styles.push(s);
+            });
+        }
+    }
+};
+/**
+ * Function called by parser when a link/edge definition has been found
+ * @param start
+ * @param end
+ * @param type
+ * @param linktext
+ */
+exports.addLink = function (start, end, type, linktext) {
+    var edge = {start: start, end: end, type: undefined, text: ''};
+    var linktext = type.text;
+    if (typeof linktext !== 'undefined') {
+        edge.text = linktext;
+    }
+
+    if (typeof type !== 'undefined') {
+        edge.type = type.type;
+    }
+    edges.push(edge);
+};
+/**
+ * Updates a link with a style
+ * @param pos
+ * @param style
+ */
+exports.updateLink = function (pos, style) {
+    var position = pos.substr(1);
+    edges[position].style = style;
+};
+/**
+ * Called by parser when a graph definition is found, stores the direction of the chart.
+ * @param dir
+ */
+exports.setDirection = function (dir) {
+    direction = dir;
+};
+exports.getDirection = function () {
+    return direction;
+};
+/**
+ * Retrieval function for fetching the found nodes after parsing has completed.
+ * @returns {{}|*|vertices}
+ */
+exports.getVertices = function () {
+    return vertices;
+};
+
+/**
+ * Retrieval function for fetching the found links after parsing has completed.
+ * @returns {{}|*|edges}
+ */
+exports.getEdges = function () {
+    return edges;
+};
+
+/**
+ * Clears the internal graph db so that a new graph can be parsed.
+ */
+exports.clear = function () {
+    vertices = {};
+    edges = [];
+};
+/**
+ *
+ * @returns {string}
+ */
+exports.defaultStyle = function () {
+    return "fill:#ffa;stroke: #f66; stroke-width: 3px; stroke-dasharray: 5, 5;fill:#ffa;stroke: #666;";
+};
+