add initial marp implementation with sample content and build configuration

node_modules/@marp-team/marpit/lib/markdown/fragment.js

@@ -0,0 +1,55 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.fragment = exports.default = void 0;
+var _plugin = _interopRequireDefault(require("../plugin"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+/** @module */
+
+const fragmentedListMarkups = ['*', ')'];
+
+/**
+ * Marpit fragment plugin.
+ *
+ * @function fragment
+ * @param {MarkdownIt} md markdown-it instance.
+ */
+function _fragment(md) {
+  // Fragmented list
+  md.core.ruler.after('marpit_directives_parse', 'marpit_fragment', state => {
+    if (state.inlineMode) return;
+    for (const token of state.tokens) {
+      if (token.type === 'list_item_open' && fragmentedListMarkups.includes(token.markup)) {
+        token.meta = token.meta || {};
+        token.meta.marpitFragment = true;
+      }
+    }
+  });
+
+  // Add data-marpit-fragment(s) attributes to token
+  md.core.ruler.after('marpit_fragment', 'marpit_apply_fragment', state => {
+    if (state.inlineMode) return;
+    const fragments = {
+      slide: undefined,
+      count: 0
+    };
+    for (const token of state.tokens) {
+      if (token.meta && token.meta.marpitSlideElement === 1) {
+        fragments.slide = token;
+        fragments.count = 0;
+      } else if (token.meta && token.meta.marpitSlideElement === -1) {
+        if (fragments.slide && fragments.count > 0) {
+          fragments.slide.attrSet('data-marpit-fragments', fragments.count);
+        }
+      } else if (token.meta && token.meta.marpitFragment) {
+        fragments.count += 1;
+        token.meta.marpitFragment = fragments.count;
+        token.attrSet('data-marpit-fragment', fragments.count);
+      }
+    }
+  });
+}
+const fragment = exports.fragment = (0, _plugin.default)(_fragment);
+var _default = exports.default = fragment;