Move each rule implementation into its own file (fixes #83).

lib/md036.js

@@ -0,0 +1,54 @@
+// @ts-check
+
+"use strict";
+
+var shared = require("./shared");
+
+module.exports = {
+  "names": [ "MD036", "no-emphasis-as-header" ],
+  "description": "Emphasis used instead of a header",
+  "tags": [ "headers", "emphasis" ],
+  "function": function MD036(params, onError) {
+    var punctuation = params.config.punctuation || ".,;:!?";
+    var re = new RegExp("[" + punctuation + "]$");
+    function base(token) {
+      if (token.type === "paragraph_open") {
+        return function inParagraph(t) {
+          // Always paragraph_open/inline/paragraph_close,
+          // omit (t.type === "inline")
+          var children = t.children.filter(function notEmptyText(child) {
+            return (child.type !== "text") || (child.content !== "");
+          });
+          if ((children.length === 3) &&
+              ((children[0].type === "strong_open") ||
+                (children[0].type === "em_open")) &&
+              (children[1].type === "text") &&
+              !re.test(children[1].content)) {
+            shared.addErrorContext(onError, t.lineNumber,
+              children[1].content);
+          }
+          return base;
+        };
+      } else if (token.type === "blockquote_open") {
+        return function inBlockquote(t) {
+          if (t.type !== "blockquote_close") {
+            return inBlockquote;
+          }
+          return base;
+        };
+      } else if (token.type === "list_item_open") {
+        return function inListItem(t) {
+          if (t.type !== "list_item_close") {
+            return inListItem;
+          }
+          return base;
+        };
+      }
+      return base;
+    }
+    var state = base;
+    params.tokens.forEach(function forToken(token) {
+      state = state(token);
+    });
+  }
+};