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Merge pull request #4334 from mermaid-js/sidv/zenuml

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Add `@mermaid-js/mermaid-zenuml` package for zenuml Integration
This commit is contained in:
Knut Sveidqvist 2023-06-02 08:41:49 +02:00 committed by GitHub
commit 1b40f552b2
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25 changed files with 1603 additions and 102 deletions
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3
.eslintignore
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@ -4,4 +4,5 @@ docs/Setup.md
cypress.config.js
cypress/plugins/index.js
coverage
*.json
*.json
node_modules

6
.vite/build.ts
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@ -44,6 +44,11 @@ const packageOptions = {
packageName: 'mermaid-example-diagram',
file: 'detector.ts',
},
'mermaid-zenuml': {
name: 'mermaid-zenuml',
packageName: 'mermaid-zenuml',
file: 'detector.ts',
},
};
interface BuildOptions {
@ -146,6 +151,7 @@ if (watch) {
build(getBuildConfig({ minify: false, watch, core: false, entryName: 'mermaid' }));
if (!mermaidOnly) {
build(getBuildConfig({ minify: false, watch, entryName: 'mermaid-example-diagram' }));
build(getBuildConfig({ minify: false, watch, entryName: 'mermaid-zenuml' }));
}
} else if (visualize) {
await build(getBuildConfig({ minify: false, core: true, entryName: 'mermaid' }));

1
.vite/server.ts
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@ -15,6 +15,7 @@ async function createServer() {
app.use(cors());
app.use(express.static('./packages/mermaid/dist'));
app.use(express.static('./packages/mermaid-zenuml/dist'));
app.use(express.static('./packages/mermaid-example-diagram/dist'));
app.use(vite.middlewares);
app.use(express.static('demos'));

4
cSpell.json
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@ -7,6 +7,7 @@
"alois",
"aloisklink",
"antiscript",
"antlr",
"appli",
"applitools",
"asciidoctor",
@ -134,7 +135,8 @@
"vitepress",
"vueuse",
"xlink",
"yash"
"yash",
"zenuml"
],
"patterns": [
{ "name": "Markdown links", "pattern": "\\((.*)\\)", "description": "" },

19
cypress/integration/rendering/zenuml.spec.js Normal file
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@ -0,0 +1,19 @@
import { imgSnapshotTest } from '../../helpers/util.js';
describe('Zen UML', () => {
it('Basic Zen UML diagram', () => {
imgSnapshotTest(
`
zenuml
A.method() {
if(x) {
B.method() {
selfCall() { return X }
}
}
}
`,
{}
);
});
});

3
cypress/platform/viewer.js
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@ -1,5 +1,6 @@
import mermaid2 from './mermaid.esm.mjs';
import externalExample from '../../packages/mermaid-example-diagram/dist/mermaid-example-diagram.core.mjs';
import zenUml from '../../packages/mermaid-zenuml/dist/mermaid-zenuml.core.mjs';
function b64ToUtf8(str) {
return decodeURIComponent(escape(window.atob(str)));
@ -44,7 +45,7 @@ const contentLoaded = async function () {
document.getElementsByTagName('body')[0].appendChild(div);
}
await mermaid2.registerExternalDiagrams([externalExample]);
await mermaid2.registerExternalDiagrams([externalExample, zenUml]);
mermaid2.initialize(graphObj.mermaid);
await mermaid2.run();
}

3
demos/index.html
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@ -66,6 +66,9 @@
<li>
<h2><a href="./state.html">State</a></h2>
</li>
<li>
<h2><a href="./zenuml.html">ZenUML</a></h2>
</li>
</ul>
</body>
</html>

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demos/zenuml.html Normal file
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@ -0,0 +1,53 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>Mermaid Zenuml Test Page</title>
</head>
<body>
<h1>Zenuml demos</h1>
<pre class="mermaid">
zenuml
title Sync Messages (Design Pattern: Adapter)
@Starter(Client)
Adapter.interfaceMethod() {
translateParameter(parameter)
result = Implementation.implementationMethod()
translateResult()
return translatedResult
}
</pre>
<pre class="mermaid">
zenuml
title Async Messages (SPA Authentication)
// ```
// GET https://${account.namespace}/authorize/?
// response_type=token
// &client_id=${account.clientId}
// &redirect_url=YOUR_CALLBACK_URL
// &state=VALUE_THAT_SURVIVES_REDIRECTS
// &scope=openid
// ```
Browser->Auth0: 1. initiate the authentication
Auth0->"Identity Provider": 2. OAuth2 / SAML, etc
"Identity Provider"->"Identity Provider": 3. user gets authenticated
Auth0->Browser: 4. redirect to ${YOUR_CALLBACK_URL}/#id_token=e68...
Browser->Auth0: 5. validate id_token and get user profile
Browser->"Your API": 6. call API sending JWT in Authorization header
"Your API"->"Your API": 7. validate token
</pre>
<script type="module">
import mermaid from './mermaid.esm.mjs';
import zenuml from './mermaid-zenuml.esm.mjs';
await mermaid.registerExternalDiagrams([zenuml]);
mermaid.initialize({
logLevel: 3,
});
</script>
</body>
</html>

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@ -0,0 +1,472 @@
> **Warning**
>
> ## THIS IS AN AUTOGENERATED FILE. DO NOT EDIT.
>
> ## Please edit the corresponding file in [/packages/mermaid/src/docs/syntax/zenuml.md](../../packages/mermaid/src/docs/syntax/zenuml.md).
# ZenUML
> A Sequence diagram is an interaction diagram that shows how processes operate with one another and in what order.
Mermaid can render sequence diagrams with [ZenUML](https://zenuml.com). Note that ZenUML uses a different
syntax than the original Sequence Diagram in mermaid.
```mermaid-example
zenuml
title Demo
Alice->John: Hello John, how are you?
John->Alice: Great!
Alice->John: See you later!
```
```mermaid
zenuml
title Demo
Alice->John: Hello John, how are you?
John->Alice: Great!
Alice->John: See you later!
```
## Syntax
### Participants
The participants can be defined implicitly as in the first example on this page. The participants or actors are
rendered in order of appearance in the diagram source text. Sometimes you might want to show the participants in a
different order than how they appear in the first message. It is possible to specify the actor's order of
appearance by doing the following:
```mermaid-example
zenuml
title Declare participant (optional)
Bob
Alice
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
```mermaid
zenuml
title Declare participant (optional)
Bob
Alice
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
### Annotators
If you specifically want to use symbols instead of just rectangles with text you can do so by using the annotator syntax to declare participants as per below.
```mermaid-example
zenuml
title Annotators
@Actor Alice
@Database Bob
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
```mermaid
zenuml
title Annotators
@Actor Alice
@Database Bob
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
Here are the available annotators:
![img.png](img/zenuml-participant-annotators.png)
### Aliases
The participants can have a convenient identifier and a descriptive label.
```mermaid-example
zenuml
title Aliases
A as Alice
J as John
A->J: Hello John, how are you?
J->A: Great!
```
```mermaid
zenuml
title Aliases
A as Alice
J as John
A->J: Hello John, how are you?
J->A: Great!
```
## Messages
Messages can be one of:
1. Sync message
2. Async message
3. Creation message
4. Reply message
### Sync message
You can think of a sync (blocking) method in a programming language.
```mermaid-example
zenuml
title Sync message
A.SyncMessage
A.SyncMessage(with, parameters) {
B.nestedSyncMessage()
}
```
```mermaid
zenuml
title Sync message
A.SyncMessage
A.SyncMessage(with, parameters) {
B.nestedSyncMessage()
}
```
### Async message
You can think of an async (non-blocking) method in a programming language.
Fire an event and forget about it.
```mermaid-example
zenuml
title Async message
Alice->Bob: How are you?
```
```mermaid
zenuml
title Async message
Alice->Bob: How are you?
```
### Creation message
We use `new` keyword to create an object.
```mermaid-example
zenuml
new A1
new A2(with, parameters)
```
```mermaid
zenuml
new A1
new A2(with, parameters)
```
### Reply message
There are three ways to express a reply message:
```mermaid-example
zenuml
// 1. assign a variable from a sync message.
a = A.SyncMessage()
// 1.1. optionally give the variable a type
SomeType a = A.SyncMessage()
// 2. use return keyword
A.SyncMessage() {
return result
}
// 3. use @return or @reply annotator on an async message
@return
A->B: result
```
```mermaid
zenuml
// 1. assign a variable from a sync message.
a = A.SyncMessage()
// 1.1. optionally give the variable a type
SomeType a = A.SyncMessage()
// 2. use return keyword
A.SyncMessage() {
return result
}
// 3. use @return or @reply annotator on an async message
@return
A->B: result
```
The third way `@return` is rarely used, but it is useful when you want to return to one level up.
```mermaid-example
zenuml
title Reply message
Client->A.method() {
B.method() {
if(condition) {
return x1
// return early
@return
A->Client: x11
}
}
return x2
}
```
```mermaid
zenuml
title Reply message
Client->A.method() {
B.method() {
if(condition) {
return x1
// return early
@return
A->Client: x11
}
}
return x2
}
```
## Nesting
Sync messages and Creation messages are naturally nestable with `{}`.
```mermaid-example
zenuml
A.method() {
B.nested_sync_method()
B->C: nested async message
}
```
```mermaid
zenuml
A.method() {
B.nested_sync_method()
B->C: nested async message
}
```
## Comments
It is possible to add comments to a sequence diagram with `// comment` syntax.
Comments will be rendered above the messages or fragments. Comments on other places
are ignored. Markdown is supported.
See the example below:
```mermaid-example
zenuml
// a comment on a participant will not be rendered
BookService
// a comment on a message.
// **Markdown** is supported.
BookService.getBook()
```
```mermaid
zenuml
// a comment on a participant will not be rendered
BookService
// a comment on a message.
// **Markdown** is supported.
BookService.getBook()
```
## Loops
It is possible to express loops in a ZenUML diagram. This is done by any of the
following notations:
1. while
2. for
3. forEach, foreach
4. loop
```zenuml
while(condition) {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->John: Hello John, how are you?
while(true) {
John->Alice: Great!
}
```
```mermaid
zenuml
Alice->John: Hello John, how are you?
while(true) {
John->Alice: Great!
}
```
## Alt
It is possible to express alternative paths in a sequence diagram. This is done by the notation
```zenuml
if(condition1) {
...statements...
} else if(condition2) {
...statements...
} else {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->Bob: Hello Bob, how are you?
if(is_sick) {
Bob->Alice: Not so good :(
} else {
Bob->Alice: Feeling fresh like a daisy
}
```
```mermaid
zenuml
Alice->Bob: Hello Bob, how are you?
if(is_sick) {
Bob->Alice: Not so good :(
} else {
Bob->Alice: Feeling fresh like a daisy
}
```
## Opt
It is possible to render an `opt` fragment. This is done by the notation
```zenuml
opt {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->Bob: Hello Bob, how are you?
Bob->Alice: Not so good :(
opt {
Bob->Alice: Thanks for asking
}
```
```mermaid
zenuml
Alice->Bob: Hello Bob, how are you?
Bob->Alice: Not so good :(
opt {
Bob->Alice: Thanks for asking
}
```
## Parallel
It is possible to show actions that are happening in parallel.
This is done by the notation
```zenuml
par {
statement1
statement2
statement3
}
```
See the example below:
```mermaid-example
zenuml
par {
Alice->Bob: Hello guys!
Alice->John: Hello guys!
}
```
```mermaid
zenuml
par {
Alice->Bob: Hello guys!
Alice->John: Hello guys!
}
```
## Try/Catch/Finally (Break)
It is possible to indicate a stop of the sequence within the flow (usually used to model exceptions).
This is done by the notation
try {
...statements...
} catch {
...statements...
} finally {
...statements...
}
See the example below:
```mermaid-example
zenuml
try {
Consumer->API: Book something
API->BookingService: Start booking process
} catch {
API->Consumer: show failure
} finally {
API->BookingService: rollback status
}
```
```mermaid
zenuml
try {
Consumer->API: Book something
API->BookingService: Start booking process
} catch {
API->Consumer: show failure
} finally {
API->BookingService: rollback status
}
```
## Integrating with your library/website.
Zenuml uses the experimental lazy loading & async rendering features which could change in the future.
You can use this method to add mermaid including the zenuml diagram to a web page:
```html
<script type="module">
import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
import zenuml from 'https://cdn.jsdelivr.net/npm/@mermaid-js/mermaid-zenuml@0.1.0/dist/mermaid-zenuml.esm.min.mjs';
await mermaid.registerExternalDiagrams([zenuml]);
</script>
```

2
package.json
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@ -18,7 +18,7 @@
"build:vite": "ts-node-esm --transpileOnly .vite/build.ts",
"build:mermaid": "pnpm build:vite --mermaid",
"build:viz": "pnpm build:mermaid --visualize",
"build:types": "tsc -p ./packages/mermaid/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid-example-diagram/tsconfig.json --emitDeclarationOnly",
"build:types": "tsc -p ./packages/mermaid/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid-zenuml/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid-example-diagram/tsconfig.json --emitDeclarationOnly",
"build:watch": "pnpm build:vite --watch",
"build": "pnpm run -r clean && pnpm build:types && pnpm build:vite",
"dev": "concurrently \"pnpm build:vite --watch\" \"ts-node-esm .vite/server.ts\"",

1
packages/mermaid-zenuml/README.md Symbolic link
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@ -0,0 +1 @@
../mermaid/src/docs/syntax/zenuml.md

47
packages/mermaid-zenuml/package.json Normal file
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@ -0,0 +1,47 @@
{
"name": "@mermaid-js/mermaid-zenuml",
"version": "0.1.0",
"description": "MermaidJS plugin for ZenUML integration",
"module": "dist/mermaid-zenuml.core.mjs",
"types": "dist/detector.d.ts",
"type": "module",
"exports": {
".": {
"import": "./dist/mermaid-zenuml.core.mjs",
"types": "./dist/detector.d.ts"
},
"./*": "./*"
},
"keywords": [
"diagram",
"markdown",
"zenuml",
"mermaid"
],
"scripts": {
"prepublishOnly": "pnpm -w run build"
},
"repository": {
"type": "git",
"url": "https://github.com/mermaid-js/mermaid",
"directory": "packages/mermaid-zenuml"
},
"contributors": [
"Peng Xiao (https://github.com/MrCoder)",
"Sidharth Vinod (https://sidharth.dev)",
"Dong Cai (https://github.com/dontry)"
],
"license": "MIT",
"dependencies": {
"@zenuml/core": "^3.0.0"
},
"devDependencies": {
"mermaid": "workspace:^"
},
"peerDependencies": {
"mermaid": "workspace:>=10.0.0"
},
"files": [
"dist"
]
}

21
packages/mermaid-zenuml/src/detector.ts Normal file
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@ -0,0 +1,21 @@
import type { ExternalDiagramDefinition } from 'mermaid';
const id = 'zenuml';
const regexp = /^\s*zenuml/;
const detector = (txt: string) => {
return txt.match(regexp) !== null;
};
const loader = async () => {
const { diagram } = await import('./zenuml-definition.js');
return { id, diagram };
};
const plugin: ExternalDiagramDefinition = {
id,
detector,
loader,
};
export default plugin;

58
packages/mermaid-zenuml/src/mermaidUtils.ts Normal file
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@ -0,0 +1,58 @@
import type { MermaidConfig } from 'mermaid';
const warning = (s: string) => {
// Todo remove debug code
// eslint-disable-next-line no-console
console.error('Log function was called before initialization', s);
};
export type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';
export const LEVELS: Record<LogLevel, number> = {
trace: 0,
debug: 1,
info: 2,
warn: 3,
error: 4,
fatal: 5,
};
export const log: Record<keyof typeof LEVELS, typeof console.log> = {
trace: warning,
debug: warning,
info: warning,
warn: warning,
error: warning,
fatal: warning,
};
export let setLogLevel: (level: keyof typeof LEVELS | number | string) => void;
export let getConfig: () => MermaidConfig;
export let sanitizeText: (str: string) => string;
// eslint-disable @typescript-eslint/no-explicit-any
export let setupGraphViewbox: (
graph: any,
svgElem: any,
padding: any,
useMaxWidth: boolean
) => void;
export const injectUtils = (
_log: Record<keyof typeof LEVELS, typeof console.log>,
_setLogLevel: any,
_getConfig: any,
_sanitizeText: any,
_setupGraphViewbox: any
) => {
_log.info('Mermaid utils injected');
log.trace = _log.trace;
log.debug = _log.debug;
log.info = _log.info;
log.warn = _log.warn;
log.error = _log.error;
log.fatal = _log.fatal;
setLogLevel = _setLogLevel;
getConfig = _getConfig;
sanitizeText = _sanitizeText;
setupGraphViewbox = _setupGraphViewbox;
};

12
packages/mermaid-zenuml/src/parser.ts Normal file
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@ -0,0 +1,12 @@
/**
* ZenUML manage parsing internally. It uses Antlr4 to parse the DSL.
* The parser is defined in https://github.com/ZenUml/vue-sequence/blob/main/src/parser/index.js
*
* This is a dummy parser that satisfies the mermaid API logic.
*/
export default {
parser: { yy: {} },
parse: () => {
// no op
},
};

17
packages/mermaid-zenuml/src/zenuml-definition.ts Normal file
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@ -0,0 +1,17 @@
import { injectUtils } from './mermaidUtils.js';
import parser from './parser.js';
import renderer from './zenumlRenderer.js';
export const diagram = {
db: {
clear: () => {
// no-op
},
},
renderer,
parser,
styles: () => {
// no-op
},
injectUtils,
};

68
packages/mermaid-zenuml/src/zenumlRenderer.ts Normal file
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@ -0,0 +1,68 @@
import { getConfig, log } from './mermaidUtils.js';
import ZenUml from '@zenuml/core';
const regexp = /^\s*zenuml/;
// Create a Zen UML container outside the svg first for rendering, otherwise the Zen UML diagram cannot be rendered properly
function createTemporaryZenumlContainer(id: string) {
const container = document.createElement('div');
container.id = `container-${id}`;
container.style.display = 'flex';
container.innerHTML = `<div id="zenUMLApp-${id}"></div>`;
const app = container.querySelector(`#zenUMLApp-${id}`) as HTMLElement;
return { container, app };
}
// Create a foreignObject to wrap the Zen UML container in the svg
function createForeignObject(id: string) {
const foreignObject = document.createElementNS('http://www.w3.org/2000/svg', 'foreignObject');
foreignObject.setAttribute('x', '0');
foreignObject.setAttribute('y', '0');
foreignObject.setAttribute('width', '100%');
foreignObject.setAttribute('height', '100%');
const { container, app } = createTemporaryZenumlContainer(id);
foreignObject.appendChild(container);
return { foreignObject, container, app };
}
/**
* Draws a Zen UML in the tag with id: id based on the graph definition in text.
*
* @param text - The text of the diagram
* @param id - The id of the diagram which will be used as a DOM element id¨
*/
export const draw = async function (text: string, id: string) {
log.info('draw with Zen UML renderer', ZenUml);
text = text.replace(regexp, '');
const { securityLevel } = getConfig();
// Handle root and Document for when rendering in sandbox mode
let sandboxElement: HTMLIFrameElement | null = null;
if (securityLevel === 'sandbox') {
sandboxElement = document.getElementById('i' + id) as HTMLIFrameElement;
}
const root = securityLevel === 'sandbox' ? sandboxElement?.contentWindow?.document : document;
const svgContainer = root?.querySelector(`svg#${id}`);
if (!root || !svgContainer) {
log.error('Cannot find root or svgContainer');
return;
}
const { foreignObject, container, app } = createForeignObject(id);
svgContainer.appendChild(foreignObject);
// @ts-expect-error @zenuml/core@3.0.0 exports the wrong type for ZenUml
const zenuml = new ZenUml(app);
// default is a theme name. More themes to be added and will be configurable in the future
await zenuml.render(text, 'theme-mermaid');
const { width, height } = window.getComputedStyle(container);
log.debug('zenuml diagram size', width, height);
svgContainer.setAttribute('style', `width: ${width}; height: ${height};`);
};
export default {
draw,
};

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packages/mermaid-zenuml/tsconfig.json Normal file
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@ -0,0 +1,9 @@
{
"extends": "../../tsconfig.json",
"compilerOptions": {
"rootDir": "./src",
"outDir": "./dist"
},
"include": ["./src/**/*.ts"],
"typeRoots": ["./src/types"]
}

1
packages/mermaid/src/docs/.vitepress/config.ts
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@ -121,6 +121,7 @@ function sidebarSyntax() {
{ text: 'C4C Diagram (Context) Diagram 🦺⚠️', link: '/syntax/c4c' },
{ text: 'Mindmaps 🔥', link: '/syntax/mindmap' },
{ text: 'Timeline 🔥', link: '/syntax/timeline' },
{ text: 'Zenuml 🔥', link: '/syntax/zenuml' },
{ text: 'Other Examples', link: '/syntax/examples' },
],
},

4
packages/mermaid/src/docs/.vitepress/theme/mermaid.ts
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@ -1,6 +1,10 @@
import mermaid, { type MermaidConfig } from 'mermaid';
import zenuml from '../../../../../mermaid-zenuml/dist/mermaid-zenuml.core.mjs';
const init = mermaid.registerExternalDiagrams([zenuml]);
export const render = async (id: string, code: string, config: MermaidConfig): Promise<string> => {
await init;
mermaid.initialize(config);
const { svg } = await mermaid.render(id, code);
return svg;

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# ZenUML
> A Sequence diagram is an interaction diagram that shows how processes operate with one another and in what order.
Mermaid can render sequence diagrams with [ZenUML](https://zenuml.com). Note that ZenUML uses a different
syntax than the original Sequence Diagram in mermaid.
```mermaid-example
zenuml
title Demo
Alice->John: Hello John, how are you?
John->Alice: Great!
Alice->John: See you later!
```
## Syntax
### Participants
The participants can be defined implicitly as in the first example on this page. The participants or actors are
rendered in order of appearance in the diagram source text. Sometimes you might want to show the participants in a
different order than how they appear in the first message. It is possible to specify the actor's order of
appearance by doing the following:
```mermaid-example
zenuml
title Declare participant (optional)
Bob
Alice
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
### Annotators
If you specifically want to use symbols instead of just rectangles with text you can do so by using the annotator syntax to declare participants as per below.
```mermaid-example
zenuml
title Annotators
@Actor Alice
@Database Bob
Alice->Bob: Hi Bob
Bob->Alice: Hi Alice
```
Here are the available annotators:
![img.png](img/zenuml-participant-annotators.png)
### Aliases
The participants can have a convenient identifier and a descriptive label.
```mermaid-example
zenuml
title Aliases
A as Alice
J as John
A->J: Hello John, how are you?
J->A: Great!
```
## Messages
Messages can be one of:
1. Sync message
2. Async message
3. Creation message
4. Reply message
### Sync message
You can think of a sync (blocking) method in a programming language.
```mermaid-example
zenuml
title Sync message
A.SyncMessage
A.SyncMessage(with, parameters) {
B.nestedSyncMessage()
}
```
### Async message
You can think of an async (non-blocking) method in a programming language.
Fire an event and forget about it.
```mermaid-example
zenuml
title Async message
Alice->Bob: How are you?
```
### Creation message
We use `new` keyword to create an object.
```mermaid-example
zenuml
new A1
new A2(with, parameters)
```
### Reply message
There are three ways to express a reply message:
```mermaid-example
zenuml
// 1. assign a variable from a sync message.
a = A.SyncMessage()
// 1.1. optionally give the variable a type
SomeType a = A.SyncMessage()
// 2. use return keyword
A.SyncMessage() {
return result
}
// 3. use @return or @reply annotator on an async message
@return
A->B: result
```
The third way `@return` is rarely used, but it is useful when you want to return to one level up.
```mermaid-example
zenuml
title Reply message
Client->A.method() {
B.method() {
if(condition) {
return x1
// return early
@return
A->Client: x11
}
}
return x2
}
```
## Nesting
Sync messages and Creation messages are naturally nestable with `{}`.
```mermaid-example
zenuml
A.method() {
B.nested_sync_method()
B->C: nested async message
}
```
## Comments
It is possible to add comments to a sequence diagram with `// comment` syntax.
Comments will be rendered above the messages or fragments. Comments on other places
are ignored. Markdown is supported.
See the example below:
```mermaid-example
zenuml
// a comment on a participant will not be rendered
BookService
// a comment on a message.
// **Markdown** is supported.
BookService.getBook()
```
## Loops
It is possible to express loops in a ZenUML diagram. This is done by any of the
following notations:
1. while
2. for
3. forEach, foreach
4. loop
```zenuml
while(condition) {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->John: Hello John, how are you?
while(true) {
John->Alice: Great!
}
```
## Alt
It is possible to express alternative paths in a sequence diagram. This is done by the notation
```zenuml
if(condition1) {
...statements...
} else if(condition2) {
...statements...
} else {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->Bob: Hello Bob, how are you?
if(is_sick) {
Bob->Alice: Not so good :(
} else {
Bob->Alice: Feeling fresh like a daisy
}
```
## Opt
It is possible to render an `opt` fragment. This is done by the notation
```zenuml
opt {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
Alice->Bob: Hello Bob, how are you?
Bob->Alice: Not so good :(
opt {
Bob->Alice: Thanks for asking
}
```
## Parallel
It is possible to show actions that are happening in parallel.
This is done by the notation
```zenuml
par {
statement1
statement2
statement3
}
```
See the example below:
```mermaid-example
zenuml
par {
Alice->Bob: Hello guys!
Alice->John: Hello guys!
}
```
## Try/Catch/Finally (Break)
It is possible to indicate a stop of the sequence within the flow (usually used to model exceptions).
This is done by the notation
```
try {
...statements...
} catch {
...statements...
} finally {
...statements...
}
```
See the example below:
```mermaid-example
zenuml
try {
Consumer->API: Book something
API->BookingService: Start booking process
} catch {
API->Consumer: show failure
} finally {
API->BookingService: rollback status
}
```
## Integrating with your library/website.
Zenuml uses the experimental lazy loading & async rendering features which could change in the future.
You can use this method to add mermaid including the zenuml diagram to a web page:
```html
<script type="module">
import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
import zenuml from 'https://cdn.jsdelivr.net/npm/@mermaid-js/mermaid-zenuml@0.1.0/dist/mermaid-zenuml.esm.min.mjs';
await mermaid.registerExternalDiagrams([zenuml]);
</script>
```

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@ -70,7 +70,6 @@ export const setupGraphViewbox = function (graph, svgElem, padding, useMaxWidth)
height = sHeight + padding * 2;
// }
// width =
log.info(`Calculated bounds: ${width}x${height}`);
configureSvgSize(svgElem, height, width, useMaxWidth);

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