feat: simple markdown parser (#252)

* feat: simple markdown parser

* chore: rename test file name

* feat: add plain text link parser

* chore: update style

web/src/labs/marked/parser/CodeBlock.ts

@@ -0,0 +1,23 @@
+export const CODE_BLOCK_REG = /^```(\S*?)\s([\s\S]*?)```(\n?)/;
+
+const match = (rawStr: string): number => {
+  const matchResult = rawStr.match(CODE_BLOCK_REG);
+  if (!matchResult) {
+    return 0;
+  }
+
+  const matchStr = matchResult[0];
+  return matchStr.length;
+};
+
+const renderer = (rawStr: string): string => {
+  const parsedStr = rawStr.replace(CODE_BLOCK_REG, "<pre lang='$1'>\n$2</pre>$3");
+  return parsedStr;
+};
+
+export default {
+  name: "code block",
+  regex: CODE_BLOCK_REG,
+  match,
+  renderer,
+};