Add node_modules

node_modules/yaml/dist/doc/anchors.js

@@ -0,0 +1,77 @@
+'use strict';
+
+var Node = require('../nodes/Node.js');
+var visit = require('../visit.js');
+
+/**
+ * Verify that the input string is a valid anchor.
+ *
+ * Will throw on errors.
+ */
+function anchorIsValid(anchor) {
+    if (/[\x00-\x19\s,[\]{}]/.test(anchor)) {
+        const sa = JSON.stringify(anchor);
+        const msg = `Anchor must not contain whitespace or control characters: ${sa}`;
+        throw new Error(msg);
+    }
+    return true;
+}
+function anchorNames(root) {
+    const anchors = new Set();
+    visit.visit(root, {
+        Value(_key, node) {
+            if (node.anchor)
+                anchors.add(node.anchor);
+        }
+    });
+    return anchors;
+}
+/** Find a new anchor name with the given `prefix` and a one-indexed suffix. */
+function findNewAnchor(prefix, exclude) {
+    for (let i = 1; true; ++i) {
+        const name = `${prefix}${i}`;
+        if (!exclude.has(name))
+            return name;
+    }
+}
+function createNodeAnchors(doc, prefix) {
+    const aliasObjects = [];
+    const sourceObjects = new Map();
+    let prevAnchors = null;
+    return {
+        onAnchor: (source) => {
+            aliasObjects.push(source);
+            if (!prevAnchors)
+                prevAnchors = anchorNames(doc);
+            const anchor = findNewAnchor(prefix, prevAnchors);
+            prevAnchors.add(anchor);
+            return anchor;
+        },
+        /**
+         * With circular references, the source node is only resolved after all
+         * of its child nodes are. This is why anchors are set only after all of
+         * the nodes have been created.
+         */
+        setAnchors: () => {
+            for (const source of aliasObjects) {
+                const ref = sourceObjects.get(source);
+                if (typeof ref === 'object' &&
+                    ref.anchor &&
+                    (Node.isScalar(ref.node) || Node.isCollection(ref.node))) {
+                    ref.node.anchor = ref.anchor;
+                }
+                else {
+                    const error = new Error('Failed to resolve repeated object (this should not happen)');
+                    error.source = source;
+                    throw error;
+                }
+            }
+        },
+        sourceObjects
+    };
+}
+
+exports.anchorIsValid = anchorIsValid;
+exports.anchorNames = anchorNames;
+exports.createNodeAnchors = createNodeAnchors;
+exports.findNewAnchor = findNewAnchor;