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feat: Support fallback layouts in renderer

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Sidharth Vinod 2024-08-21 13:27:23 +05:30
parent 8fdeb6d9d3
commit 69b3a9d3a2
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1 changed files with 16 additions and 4 deletions
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20
packages/mermaid/src/rendering-util/render.ts
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@ -1,3 +1,5 @@
import { log } from '$root/logger.js';
export interface LayoutAlgorithm {
render(data4Layout: any, svg: any, element: any, algorithm?: string): any;
}
@ -24,10 +26,6 @@ const registerDefaultLayoutLoaders = () => {
name: 'dagre',
loader: async () => await import('./layout-algorithms/dagre/index.js'),
},
// {
// name: 'elk',
// loader: async () => await import('../../../mermaid-layout-elk/src/render.js'),
// },
]);
};
@ -42,3 +40,17 @@ export const render = async (data4Layout: any, svg: any, element: any) => {
const layoutRenderer = await layoutDefinition.loader();
return layoutRenderer.render(data4Layout, svg, element, layoutDefinition.algorithm);
};
/**
* Get the registered layout algorithm. If the algorithm is not registered, use the fallback algorithm.
*/
export const getRegisteredLayoutAlgorithm = (algorithm = '', { fallback = 'dagre' } = {}) => {
if (algorithm in layoutAlgorithms) {
return algorithm;
}
if (fallback in layoutAlgorithms) {
log.warn(`Layout algorithm ${algorithm} is not registered. Using ${fallback} as fallback.`);
return fallback;
}
throw new Error(`Both layout algorithms ${algorithm} and ${fallback} are not registered.`);
};