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68 lines
4.9 KiB
Markdown
68 lines
4.9 KiB
Markdown
# Diagram Syntax
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Mermaid's syntax is used to create diagrams. You'll find that it is not too tricky and can be learned in a day. The next sections dive deep into the syntax of each diagram type.
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Syntax, together with Deployment and Configuration constitute the whole of Mermaid.
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Diagram Examples can be found in the [Mermaid Live Editor](https://mermaid-js.github.io/mermaid-live-editor), it is also a great practice area.
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## Syntax Structure
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One would notice that all **Diagrams definitions begin** with a declaration of the **diagram type**, followed by the definitions of the diagram and its contents. This declaration notifies the parser which kind of diagram the code is supposed to generate.
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**Example** : The code below is for an Entity Relationship Diagram, specified by the `erDiagram` declaration. What follows is the definition of the different `Entities` represented in it.
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```mermaid-example
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erDiagram
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CUSTOMER }|..|{ DELIVERY-ADDRESS : has
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CUSTOMER ||--o{ ORDER : places
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CUSTOMER ||--o{ INVOICE : "liable for"
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DELIVERY-ADDRESS ||--o{ ORDER : receives
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INVOICE ||--|{ ORDER : covers
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ORDER ||--|{ ORDER-ITEM : includes
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PRODUCT-CATEGORY ||--|{ PRODUCT : contains
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PRODUCT ||--o{ ORDER-ITEM : "ordered in"
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```
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The [Getting Started](../intro/n00b-gettingStarted.md) section can also provide some practical examples of mermaid syntax.
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## Diagram Breaking
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One should **beware the use of some words or symbols** that can break diagrams. These words or symbols are few and often only affect specific types of diagrams. The table below will continuously be updated.
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| Diagram Breakers | Reason | Solution |
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| -------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ | ------------------------------------------------- |
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| **Comments** | | |
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| [` %%{``}%% `](https://github.com/mermaid-js/mermaid/issues/1968) | Similar to [Directives](./directives.md) confuses the renderer. | In comments using `%%`, avoid using "{}". |
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| **Flow-Charts** | | |
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| 'end' | The word "End" can cause Flowcharts and Sequence diagrams to break | Wrap them in quotation marks to prevent breakage. |
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| [Nodes inside Nodes](https://mermaid-js.github.io/mermaid/#/flowchart?id=special-characters-that-break-syntax) | Mermaid gets confused with nested shapes | wrap them in quotation marks to prevent breaking |
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### Mermaid Live Editor
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Now, that you've seen what you should not add to your diagrams, you can play around with them in the [Mermaid Live Editor](https://mermaid-js.github.io/mermaid-live-editor).
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# Configuration
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Configuration is the third part of Mermaid, after deployment and syntax. It deals with the different ways that Mermaid can be customized across different deployments.
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If you are interested in altering and customizing your Mermaid Diagrams, you will find the methods and values available for [Configuration](../config/Setup.md) here. It includes themes.
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This section will introduce the different methods of configuring the behaviors and appearances of Mermaid Diagrams.
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The following are the most commonly used methods, and they are all tied to Mermaid [Deployment](../intro/n00b-gettingStarted.md) methods.
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### Configuration Section in the [Live Editor](https://mermaid-js.github.io/mermaid-live-editor).
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Here you can edit certain values to change the behavior and appearance of the diagram.
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### [The initialize() call](../intro/n00b-gettingStarted?id=_3-calling-the-javascript-api),
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Used when Mermaid is called via an API, or through a `<script>` tag.
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### [Directives](../config/directives.md),
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Allows for the limited reconfiguration of a diagram just before it is rendered. It can alter the font style, color and other aesthetic aspects of the diagram. You can pass a directive alongside your definition inside `%%{ }%%`. It can be done either above or below your diagram definition.
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### [Theme Manipulation](../config/theming.md):
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An application of using Directives to change [Themes](../config/theming.md). `Theme` is a value within Mermaid's configuration that dictates the color scheme for diagrams.
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