init

node_modules/estree-walker/dist/esm/estree-walker.js

@@ -0,0 +1,333 @@
+// @ts-check
+/** @typedef { import('estree').BaseNode} BaseNode */
+
+/** @typedef {{
+	skip: () => void;
+	remove: () => void;
+	replace: (node: BaseNode) => void;
+}} WalkerContext */
+
+class WalkerBase {
+	constructor() {
+		/** @type {boolean} */
+		this.should_skip = false;
+
+		/** @type {boolean} */
+		this.should_remove = false;
+
+		/** @type {BaseNode | null} */
+		this.replacement = null;
+
+		/** @type {WalkerContext} */
+		this.context = {
+			skip: () => (this.should_skip = true),
+			remove: () => (this.should_remove = true),
+			replace: (node) => (this.replacement = node)
+		};
+	}
+
+	/**
+	 *
+	 * @param {any} parent
+	 * @param {string} prop
+	 * @param {number} index
+	 * @param {BaseNode} node
+	 */
+	replace(parent, prop, index, node) {
+		if (parent) {
+			if (index !== null) {
+				parent[prop][index] = node;
+			} else {
+				parent[prop] = node;
+			}
+		}
+	}
+
+	/**
+	 *
+	 * @param {any} parent
+	 * @param {string} prop
+	 * @param {number} index
+	 */
+	remove(parent, prop, index) {
+		if (parent) {
+			if (index !== null) {
+				parent[prop].splice(index, 1);
+			} else {
+				delete parent[prop];
+			}
+		}
+	}
+}
+
+// @ts-check
+
+/** @typedef { import('estree').BaseNode} BaseNode */
+/** @typedef { import('./walker.js').WalkerContext} WalkerContext */
+
+/** @typedef {(
+ *    this: WalkerContext,
+ *    node: BaseNode,
+ *    parent: BaseNode,
+ *    key: string,
+ *    index: number
+ * ) => void} SyncHandler */
+
+class SyncWalker extends WalkerBase {
+	/**
+	 *
+	 * @param {SyncHandler} enter
+	 * @param {SyncHandler} leave
+	 */
+	constructor(enter, leave) {
+		super();
+
+		/** @type {SyncHandler} */
+		this.enter = enter;
+
+		/** @type {SyncHandler} */
+		this.leave = leave;
+	}
+
+	/**
+	 *
+	 * @param {BaseNode} node
+	 * @param {BaseNode} parent
+	 * @param {string} [prop]
+	 * @param {number} [index]
+	 * @returns {BaseNode}
+	 */
+	visit(node, parent, prop, index) {
+		if (node) {
+			if (this.enter) {
+				const _should_skip = this.should_skip;
+				const _should_remove = this.should_remove;
+				const _replacement = this.replacement;
+				this.should_skip = false;
+				this.should_remove = false;
+				this.replacement = null;
+
+				this.enter.call(this.context, node, parent, prop, index);
+
+				if (this.replacement) {
+					node = this.replacement;
+					this.replace(parent, prop, index, node);
+				}
+
+				if (this.should_remove) {
+					this.remove(parent, prop, index);
+				}
+
+				const skipped = this.should_skip;
+				const removed = this.should_remove;
+
+				this.should_skip = _should_skip;
+				this.should_remove = _should_remove;
+				this.replacement = _replacement;
+
+				if (skipped) return node;
+				if (removed) return null;
+			}
+
+			for (const key in node) {
+				const value = node[key];
+
+				if (typeof value !== "object") {
+					continue;
+				} else if (Array.isArray(value)) {
+					for (let i = 0; i < value.length; i += 1) {
+						if (value[i] !== null && typeof value[i].type === 'string') {
+							if (!this.visit(value[i], node, key, i)) {
+								// removed
+								i--;
+							}
+						}
+					}
+				} else if (value !== null && typeof value.type === "string") {
+					this.visit(value, node, key, null);
+				}
+			}
+
+			if (this.leave) {
+				const _replacement = this.replacement;
+				const _should_remove = this.should_remove;
+				this.replacement = null;
+				this.should_remove = false;
+
+				this.leave.call(this.context, node, parent, prop, index);
+
+				if (this.replacement) {
+					node = this.replacement;
+					this.replace(parent, prop, index, node);
+				}
+
+				if (this.should_remove) {
+					this.remove(parent, prop, index);
+				}
+
+				const removed = this.should_remove;
+
+				this.replacement = _replacement;
+				this.should_remove = _should_remove;
+
+				if (removed) return null;
+			}
+		}
+
+		return node;
+	}
+}
+
+// @ts-check
+
+/** @typedef { import('estree').BaseNode} BaseNode */
+/** @typedef { import('./walker').WalkerContext} WalkerContext */
+
+/** @typedef {(
+ *    this: WalkerContext,
+ *    node: BaseNode,
+ *    parent: BaseNode,
+ *    key: string,
+ *    index: number
+ * ) => Promise<void>} AsyncHandler */
+
+class AsyncWalker extends WalkerBase {
+	/**
+	 *
+	 * @param {AsyncHandler} enter
+	 * @param {AsyncHandler} leave
+	 */
+	constructor(enter, leave) {
+		super();
+
+		/** @type {AsyncHandler} */
+		this.enter = enter;
+
+		/** @type {AsyncHandler} */
+		this.leave = leave;
+	}
+
+	/**
+	 *
+	 * @param {BaseNode} node
+	 * @param {BaseNode} parent
+	 * @param {string} [prop]
+	 * @param {number} [index]
+	 * @returns {Promise<BaseNode>}
+	 */
+	async visit(node, parent, prop, index) {
+		if (node) {
+			if (this.enter) {
+				const _should_skip = this.should_skip;
+				const _should_remove = this.should_remove;
+				const _replacement = this.replacement;
+				this.should_skip = false;
+				this.should_remove = false;
+				this.replacement = null;
+
+				await this.enter.call(this.context, node, parent, prop, index);
+
+				if (this.replacement) {
+					node = this.replacement;
+					this.replace(parent, prop, index, node);
+				}
+
+				if (this.should_remove) {
+					this.remove(parent, prop, index);
+				}
+
+				const skipped = this.should_skip;
+				const removed = this.should_remove;
+
+				this.should_skip = _should_skip;
+				this.should_remove = _should_remove;
+				this.replacement = _replacement;
+
+				if (skipped) return node;
+				if (removed) return null;
+			}
+
+			for (const key in node) {
+				const value = node[key];
+
+				if (typeof value !== "object") {
+					continue;
+				} else if (Array.isArray(value)) {
+					for (let i = 0; i < value.length; i += 1) {
+						if (value[i] !== null && typeof value[i].type === 'string') {
+							if (!(await this.visit(value[i], node, key, i))) {
+								// removed
+								i--;
+							}
+						}
+					}
+				} else if (value !== null && typeof value.type === "string") {
+					await this.visit(value, node, key, null);
+				}
+			}
+
+			if (this.leave) {
+				const _replacement = this.replacement;
+				const _should_remove = this.should_remove;
+				this.replacement = null;
+				this.should_remove = false;
+
+				await this.leave.call(this.context, node, parent, prop, index);
+
+				if (this.replacement) {
+					node = this.replacement;
+					this.replace(parent, prop, index, node);
+				}
+
+				if (this.should_remove) {
+					this.remove(parent, prop, index);
+				}
+
+				const removed = this.should_remove;
+
+				this.replacement = _replacement;
+				this.should_remove = _should_remove;
+
+				if (removed) return null;
+			}
+		}
+
+		return node;
+	}
+}
+
+// @ts-check
+
+/** @typedef { import('estree').BaseNode} BaseNode */
+/** @typedef { import('./sync.js').SyncHandler} SyncHandler */
+/** @typedef { import('./async.js').AsyncHandler} AsyncHandler */
+
+/**
+ *
+ * @param {BaseNode} ast
+ * @param {{
+ *   enter?: SyncHandler
+ *   leave?: SyncHandler
+ * }} walker
+ * @returns {BaseNode}
+ */
+function walk(ast, { enter, leave }) {
+	const instance = new SyncWalker(enter, leave);
+	return instance.visit(ast, null);
+}
+
+/**
+ *
+ * @param {BaseNode} ast
+ * @param {{
+ *   enter?: AsyncHandler
+ *   leave?: AsyncHandler
+ * }} walker
+ * @returns {Promise<BaseNode>}
+ */
+async function asyncWalk(ast, { enter, leave }) {
+	const instance = new AsyncWalker(enter, leave);
+	return await instance.visit(ast, null);
+}
+
+export { asyncWalk, walk };

node_modules/estree-walker/dist/esm/package.json

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+{"type":"module"}