@std/front-matter

import { test, extractJson } from "@std/front-matter";
import { assertEquals } from "@std/assert";

const str = "---json\n{\"and\": \"this\"}\n---\ndeno is awesome";

assertEquals(test(str), true);
assertEquals(extractJson(str), {
  frontMatter: "{\"and\": \"this\"}",
  body: "deno is awesome",
  attrs: { and: "this" }
});

---json
{
  "and": "this"
}
---

{
  "is": "JSON"
}

import { test, extractToml } from "@std/front-matter";
import { assertEquals } from "@std/assert";

const str = "---toml\nmodule = 'front_matter'\n---\ndeno is awesome";

assertEquals(test(str), true);
assertEquals(extractToml(str), {
  frontMatter: "module = 'front_matter'",
  body: "deno is awesome",
  attrs: { module: "front_matter" }
});

---toml
this = 'is'
---

= toml =
parsed = 'as'
toml = 'data'
= toml =

+++
is = 'that'
not = 'cool?'
+++

import { test, extractYaml } from "@std/front-matter";
import { assertEquals } from "@std/assert";

const str = "---yaml\nmodule: front_matter\n---\ndeno is awesome";

assertEquals(test(str), true);
assertEquals(extractYaml(str), {
  frontMatter: "module: front_matter",
  body: "deno is awesome",
  attrs: { module: "front_matter" }
});

---
these: are
---

---yaml
all: recognized
---

= yaml =
as: yaml
= yaml =

deno add jsr:@std/front-matter

// 检测并提取 YAML front matter
import { extractYaml, test } from "@std/front-matter";

const source = `---yaml\ntitle: Hello\nauthor: Ada\n---\nContent starts here.`;

if (test(source)) {
  const { attrs, body, frontMatter } = extractYaml(source);
  // attrs: { title: "Hello", author: "Ada" }
  // body: "Content starts here."
  // frontMatter: "title: Hello\nauthor: Ada"
}

// JSON front matter
import { extractJson } from "@std/front-matter";

const jsonSource = `---json\n{ "tags": ["news", "deno"] }\n---\nPost body`;
const { attrs } = extractJson(jsonSource);
// attrs: { tags: ["news", "deno"] }

// TOML front matter
import { extractToml } from "@std/front-matter";

const tomlSource = `+++\ncategory = 'release'\n+++\nNotes...`;
const { attrs, body } = extractToml(tomlSource);
// attrs: { category: "release" }
// body: "Notes..."