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import type { MermaidConfig } from "@excalidraw/mermaid-to-excalidraw";
import type { MermaidToExcalidrawResult } from "@excalidraw/mermaid-to-excalidraw/dist/interfaces";
import { DEFAULT_EXPORT_PADDING, EDITOR_LS_KEYS } from "../../constants";
import { convertToExcalidrawElements, exportToCanvas } from "../../index";
import type { NonDeletedExcalidrawElement } from "../../element/types";
import type { AppClassProperties, BinaryFiles } from "../../types";
import { canvasToBlob } from "../../data/blob";
import { EditorLocalStorage } from "../../data/EditorLocalStorage";
import { t } from "../../i18n";
const resetPreview = ({
canvasRef,
setError,
}: {
canvasRef: React.RefObject<HTMLDivElement | null>;
setError: (error: Error | null) => void;
}) => {
const canvasNode = canvasRef.current;
if (!canvasNode) {
return;
}
const parent = canvasNode.parentElement;
if (!parent) {
return;
}
parent.style.background = "";
setError(null);
canvasNode.replaceChildren();
};
export interface MermaidToExcalidrawLibProps {
loaded: boolean;
api: Promise<{
parseMermaidToExcalidraw: (
definition: string,
config?: MermaidConfig,
) => Promise<MermaidToExcalidrawResult>;
}>;
}
interface ConvertMermaidToExcalidrawFormatProps {
canvasRef: React.RefObject<HTMLDivElement | null>;
mermaidToExcalidrawLib: MermaidToExcalidrawLibProps;
mermaidDefinition: string;
setError: (error: Error | null) => void;
data: React.MutableRefObject<{
elements: readonly NonDeletedExcalidrawElement[];
files: BinaryFiles | null;
}>;
}
export const convertMermaidToExcalidraw = async ({
canvasRef,
mermaidToExcalidrawLib,
mermaidDefinition,
setError,
data,
}: ConvertMermaidToExcalidrawFormatProps) => {
const canvasNode = canvasRef.current;
const parent = canvasNode?.parentElement;
if (!canvasNode || !parent) {
return;
}
if (!mermaidDefinition) {
resetPreview({ canvasRef, setError });
return;
}
try {
const api = await mermaidToExcalidrawLib.api;
let ret;
try {
ret = await api.parseMermaidToExcalidraw(mermaidDefinition);
} catch (err: any) {
ret = await api.parseMermaidToExcalidraw(
mermaidDefinition.replace(/"/g, "'"),
);
}
const { elements, files = {} } = ret;
setError(null);
data.current = {
elements: convertToExcalidrawElements(elements, {
regenerateIds: true,
}),
files,
};
const canvas = await exportToCanvas({
elements: data.current.elements,
files: data.current.files,
exportPadding: DEFAULT_EXPORT_PADDING,
maxWidthOrHeight:
Math.max(parent.offsetWidth, parent.offsetHeight) *
window.devicePixelRatio,
});
// if converting to blob fails, there's some problem that will
// likely prevent preview and export (e.g. canvas too big)
try {
await canvasToBlob(canvas);
} catch (e: any) {
if (e.name === "CANVAS_POSSIBLY_TOO_BIG") {
throw new Error(t("canvasError.canvasTooBig"));
}
throw e;
}
parent.style.background = "var(--default-bg-color)";
canvasNode.replaceChildren(canvas);
} catch (err: any) {
parent.style.background = "var(--default-bg-color)";
if (mermaidDefinition) {
setError(err);
}
throw err;
}
};
export const saveMermaidDataToStorage = (mermaidDefinition: string) => {
EditorLocalStorage.set(
EDITOR_LS_KEYS.MERMAID_TO_EXCALIDRAW,
mermaidDefinition,
);
};
export const insertToEditor = ({
app,
data,
text,
shouldSaveMermaidDataToStorage,
}: {
app: AppClassProperties;
data: React.MutableRefObject<{
elements: readonly NonDeletedExcalidrawElement[];
files: BinaryFiles | null;
}>;
text?: string;
shouldSaveMermaidDataToStorage?: boolean;
}) => {
const { elements: newElements, files } = data.current;
if (!newElements.length) {
return;
}
app.addElementsFromPasteOrLibrary({
elements: newElements,
files,
position: "center",
fitToContent: true,
});
app.setOpenDialog(null);
if (shouldSaveMermaidDataToStorage && text) {
saveMermaidDataToStorage(text);
}
};
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