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silverbullet/webapp/markdown_ext.ts
2022-04-11 20:34:09 +02:00

67 lines
1.7 KiB
TypeScript

import { Tag } from "@codemirror/highlight";
import type { MarkdownConfig } from "@lezer/markdown";
import { System } from "../plugos/system";
import { Manifest } from "../common/manifest";
export type MDExt = {
// unicode char code for efficiency .charCodeAt(0)
firstCharCodes: number[];
regex: RegExp;
nodeType: string;
tag: Tag;
styles: { [key: string]: string };
};
export function mdExtensionSyntaxConfig({
regex,
firstCharCodes,
nodeType,
}: MDExt): MarkdownConfig {
return {
defineNodes: [nodeType],
parseInline: [
{
name: nodeType,
parse(cx, next, pos) {
if (!firstCharCodes.includes(next)) {
return -1;
}
let match = regex.exec(cx.slice(pos, cx.end));
if (!match) {
return -1;
}
return cx.addElement(cx.elt(nodeType, pos, pos + match[0].length));
},
after: "Emphasis",
},
],
};
}
export function mdExtensionStyleTags({ nodeType, tag }: MDExt): {
[selector: string]: Tag | readonly Tag[];
} {
return {
[nodeType]: tag,
};
}
export function loadMarkdownExtensions(system: System<any>): MDExt[] {
let mdExtensions: MDExt[] = [];
for (let plug of system.loadedPlugs.values()) {
let manifest = plug.manifest as Manifest;
if (manifest.syntax) {
for (let [nodeType, def] of Object.entries(manifest.syntax)) {
mdExtensions.push({
nodeType,
tag: Tag.define(),
firstCharCodes: def.firstCharacters.map((ch) => ch.charCodeAt(0)),
regex: new RegExp("^" + def.regex),
styles: def.styles,
});
}
}
}
return mdExtensions;
}