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import type {
Element,
MarkdownExtension,
BlockContext,
Line
} from "@lezer/markdown";
import { parseMixed } from "@lezer/common";
import { yaml } from "@codemirror/legacy-modes/mode/yaml";
import { foldInside, foldNodeProp, StreamLanguage } from "@codemirror/language";
import { styleTags, tags } from "@lezer/highlight";
const frontMatterFence = /^---\s*$/m;
export const frontmatter: MarkdownExtension = {
defineNodes: [{ name: "Frontmatter", block: true }, "FrontmatterMark"],
props: [
styleTags({
Frontmatter: [tags.documentMeta, tags.monospace],
FrontmatterMark: tags.processingInstruction
}),
foldNodeProp.add({
Frontmatter: foldInside,
FrontmatterMark: () => null
})
],
wrap: parseMixed((node) => {
const { parser } = StreamLanguage.define(yaml);
if (node.type.name === "Frontmatter") {
return {
parser,
overlay: [{ from: node.from + 4, to: node.to - 4 }]
};
}
return null;
}),
parseBlock: [
{
name: "Frontmatter",
before: "HorizontalRule",
parse: (cx: BlockContext, line: Line): boolean => {
let end: number | undefined = undefined;
const children = new Array<Element>();
if (cx.lineStart === 0 && frontMatterFence.test(line.text)) {
children.push(cx.elt("FrontmatterMark", 0, 4));
while (cx.nextLine()) {
if (frontMatterFence.test(line.text)) {
end = cx.lineStart + 4;
break;
}
}
if (end !== undefined) {
children.push(cx.elt("FrontmatterMark", end - 4, end));
cx.addElement(cx.elt("Frontmatter", 0, end, children));
}
return true;
}
return false;
}
}
]
};
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