stuff

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

@@ -0,0 +1,59 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.sweep = exports.default = void 0;
+var _plugin = _interopRequireDefault(require("../plugin"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+/** @module */
+
+/**
+ * Marpit sweep plugin.
+ *
+ * Hide blank paragraphs. For better support of the background image syntax and
+ * directives through HTML comment, Marpit will sweep paragraphs including only
+ * whitespace by setting `hidden: true`.
+ *
+ * It also sweeps the inline token marked as hidden forcefully. Please notice
+ * that plugins executed after this cannot handle hidden inline tokens.
+ *
+ * @function sweep
+ * @param {MarkdownIt} md markdown-it instance.
+ */
+function _sweep(md) {
+  md.core.ruler.after('inline', 'marpit_sweep', state => {
+    if (state.inlineMode) return;
+    for (const token of state.tokens) {
+      if (token.type === 'html_block' && token.content.match(/^\s*$/) || token.type === 'inline' && token.children.filter(t => !(t.hidden || t.type === 'softbreak')).every(t => t.type === 'text' && t.content.match(/^\s*$/))) token.hidden = true;
+    }
+  });
+  md.core.ruler.push('marpit_sweep_paragraph', state => {
+    if (state.inlineMode) return;
+    const current = {
+      open: [],
+      tokens: {}
+    };
+    for (const token of state.tokens) {
+      if (token.type === 'inline' && token.hidden) {
+        // markdown-it's "inline" type is not following a `hidden` flag. Marpit
+        // changes the token type to unique name to hide token forcefully.
+        token.type = 'marpit_hidden_inline';
+      } else if (token.type === 'paragraph_open') {
+        current.open.push(token);
+        current.tokens[token] = [];
+      } else if (token.type === 'paragraph_close') {
+        const openToken = current.open.pop();
+        if (current.tokens[openToken].every(t => t.hidden)) {
+          openToken.hidden = true;
+          token.hidden = true;
+        }
+      } else {
+        const len = current.open.length;
+        if (len > 0) current.tokens[current.open[len - 1]].push(token);
+      }
+    }
+  });
+}
+const sweep = exports.sweep = (0, _plugin.default)(_sweep);
+var _default = exports.default = sweep;