stuff

node_modules/@marp-team/marpit/lib/postcss/import/parse.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.importParse = exports.default = void 0;
+var _postcss_plugin = _interopRequireDefault(require("../../helpers/postcss_plugin"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+/** @module */
+
+/**
+ * @typedef {object} ImportMeta
+ * @prop {AtRule} node The at-rule node parsed by PostCSS.
+ * @prop {string} value The specified value.
+ */
+
+/**
+ * Marpit PostCSS import parse plugin.
+ *
+ * Parse `@import` and `@import-theme` rules that specify a plain string.
+ *
+ * The `@import` rule for Marpit theme follows CSS spec. It must precede all
+ * other statements. (excepted `@charset`)
+ *
+ * When you are using CSS preprocessors like Sass, `@import` would resolve path
+ * in compiling and would be lost definition. So you can use `@import-theme`
+ * rule alternatively.
+ *
+ * A specification of `@import-theme` has a bit different from `@import`. You
+ * can place `@import-theme` rule at any in the CSS root, and the content of
+ * imported theme will always append to the beginning of CSS.
+ *
+ * @function importParse
+ */
+const importParse = exports.importParse = (0, _postcss_plugin.default)('marpit-postcss-import-parse', () => (css, {
+  result
+}) => {
+  const imports = {
+    import: [],
+    importTheme: []
+  };
+  let allowImport = true;
+  css.walk(node => {
+    if (node.type === 'atrule') {
+      const push = target => {
+        const [quote] = node.params;
+        if (quote !== '"' && quote !== "'") return;
+        const splitValue = node.params.slice(1).split(quote);
+        let value = '';
+        splitValue.every(v => {
+          if (v.endsWith('\\')) {
+            value = `${value}${v.slice(0, -1)}${quote}`;
+            return true;
+          }
+          value = `${value}${v}`;
+          return false;
+        });
+        node.marpitImportParse = value;
+        target.push({
+          node,
+          value
+        });
+      };
+      if (allowImport) {
+        if (node.name === 'import') {
+          push(imports.import);
+        } else if (node.name !== 'charset') {
+          allowImport = false;
+        }
+      }
+      if (node.name === 'import-theme' && node.parent.type === 'root') {
+        push(imports.importTheme);
+      }
+    } else if (node.type !== 'comment') {
+      allowImport = false;
+    }
+  });
+  result.marpitImport = [...imports.importTheme, ...imports.import];
+});
+var _default = exports.default = importParse;