#1257 Adding the autonumber keyword + tests and docs

src/diagrams/sequence/parser/sequenceDiagram.jison

@@ -47,6 +47,7 @@
 "deactivate"      { this.begin('ID'); return 'deactivate'; }
 "title"           return 'title';
 "sequenceDiagram" return 'SD';
+"autonumber" 			return 'autonumber';
 ","               return ',';
 ";"               return 'NL';
 [^\+\->:\n,;]+      { yytext = yytext.trim(); return 'ACTOR'; }
@@ -91,6 +92,7 @@ statement
 	: 'participant' actor 'AS' restOfLine 'NL' {$2.description=$4; $$=$2;}
 	| 'participant' actor 'NL' {$$=$2;}
 	| signal 'NL'
+	| autonumber {yy.enableSequenceNumbers()}
 	| 'activate' actor 'NL' {$$={type: 'activeStart', signalType: yy.LINETYPE.ACTIVE_START, actor: $2};}
 	| 'deactivate' actor 'NL' {$$={type: 'activeEnd', signalType: yy.LINETYPE.ACTIVE_END, actor: $2};}
 	| note_statement 'NL'

src/diagrams/sequence/sequenceDb.js

@@ -4,7 +4,7 @@ let actors = {};
 let messages = [];
 const notes = [];
 let title = '';
-
+let sequenceNumbersEnabled = false;
 export const addActor = function(id, name, description) {
   // Don't allow description nulling
   const old = actors[id];
@@ -80,6 +80,10 @@ export const getActorKeys = function() {
 export const getTitle = function() {
   return title;
 };
+export const enableSequenceNumbers = function() {
+  sequenceNumbersEnabled = true;
+};
+export const showSequenceNumbers = () => sequenceNumbersEnabled;
 
 export const clear = function() {
   actors = {};
@@ -210,6 +214,8 @@ export default {
   addActor,
   addMessage,
   addSignal,
+  enableSequenceNumbers,
+  showSequenceNumbers,
   getMessages,
   getActors,
   getActor,

src/diagrams/sequence/sequenceDiagram.spec.js

@@ -33,6 +33,27 @@ describe('when parsing a sequenceDiagram', function() {
     expect(messages[0].from).toBe('Alice');
     expect(messages[2].from).toBe('Bob');
   });
+  it('it should not show sequence numbers per default', function() {
+    const str =
+      'sequenceDiagram\n' +
+      'Alice->Bob:Hello Bob, how are you?\n' +
+      'Note right of Bob: Bob thinks\n' +
+      'Bob-->Alice: I am good thanks!';
+
+      parser.parse(str);
+      expect(parser.yy.showSequenceNumbers()).toBe(false);
+    });
+  it('it should show sequence numbers when autonumber is enabled', function() {
+    const str =
+      'sequenceDiagram\n' +
+      'autonumber\n' +
+      'Alice->Bob:Hello Bob, how are you?\n' +
+      'Note right of Bob: Bob thinks\n' +
+      'Bob-->Alice: I am good thanks!';
+
+    parser.parse(str);
+    expect(parser.yy.showSequenceNumbers()).toBe(true);
+  });
   it('it should handle a sequenceDiagram definition with a title', function() {
     const str =
       'sequenceDiagram\n' +

src/diagrams/sequence/sequenceRenderer.js

@@ -342,7 +342,7 @@ const drawMessage = function(elem, startx, stopx, verticalPos, msg, sequenceInde
   }
 
   // add node number
-  if (conf.showSequenceNumbers) {
+  if (sequenceDb.showSequenceNumbers() || conf.showSequenceNumbers) {
     line.attr('marker-start', 'url(' + url + '#sequencenumber)');
     g.append('text')
       .attr('x', startx)