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visit.js
import { isDocument, isNode, isPair, isCollection, isMap, isSeq, isScalar, isAlias } from './nodes/Node.js'; const BREAK = Symbol('break visit'); const SKIP = Symbol('skip children'); const REMOVE = Symbol('remove node'); /** * Apply a visitor to an AST node or document. * * Walks through the tree (depth-first) starting from `node`, calling a * `visitor` function with three arguments: * - `key`: For sequence values and map `Pair`, the node's index in the * collection. Within a `Pair`, `'key'` or `'value'`, correspondingly. * `null` for the root node. * - `node`: The current node. * - `path`: The ancestry of the current node. * * The return value of the visitor may be used to control the traversal: * - `undefined` (default): Do nothing and continue * - `visit.SKIP`: Do not visit the children of this node, continue with next * sibling * - `visit.BREAK`: Terminate traversal completely * - `visit.REMOVE`: Remove the current node, then continue with the next one * - `Node`: Replace the current node, then continue by visiting it * - `number`: While iterating the items of a sequence or map, set the index * of the next step. This is useful especially if the index of the current * node has changed. * * If `visitor` is a single function, it will be called with all values * encountered in the tree, including e.g. `null` values. Alternatively, * separate visitor functions may be defined for each `Map`, `Pair`, `Seq`, * `Alias` and `Scalar` node. To define the same visitor function for more than * one node type, use the `Collection` (map and seq), `Value` (map, seq & scalar) * and `Node` (alias, map, seq & scalar) targets. Of all these, only the most * specific defined one will be used for each node. */ function visit(node, visitor) { const visitor_ = initVisitor(visitor); if (isDocument(node)) { const cd = visit_(null, node.contents, visitor_, Object.freeze([node])); if (cd === REMOVE) node.contents = null; } else visit_(null, node, visitor_, Object.freeze([])); } // Without the `as symbol` casts, TS declares these in the `visit` // namespace using `var`, but then complains about that because // `unique symbol` must be `const`. /** Terminate visit traversal completely */ visit.BREAK = BREAK; /** Do not visit the children of the current node */ visit.SKIP = SKIP; /** Remove the current node */ visit.REMOVE = REMOVE; function visit_(key, node, visitor, path) { const ctrl = callVisitor(key, node, visitor, path); if (isNode(ctrl) || isPair(ctrl)) { replaceNode(key, path, ctrl); return visit_(key, ctrl, visitor, path); } if (typeof ctrl !== 'symbol') { if (isCollection(node)) { path = Object.freeze(path.concat(node)); for (let i = 0; i < node.items.length; ++i) { const ci = visit_(i, node.items[i], visitor, path); if (typeof ci === 'number') i = ci - 1; else if (ci === BREAK) return BREAK; else if (ci === REMOVE) { node.items.splice(i, 1); i -= 1; } } } else if (isPair(node)) { path = Object.freeze(path.concat(node)); const ck = visit_('key', node.key, visitor, path); if (ck === BREAK) return BREAK; else if (ck === REMOVE) node.key = null; const cv = visit_('value', node.value, visitor, path); if (cv === BREAK) return BREAK; else if (cv === REMOVE) node.value = null; } } return ctrl; } /** * Apply an async visitor to an AST node or document. * * Walks through the tree (depth-first) starting from `node`, calling a * `visitor` function with three arguments: * - `key`: For sequence values and map `Pair`, the node's index in the * collection. Within a `Pair`, `'key'` or `'value'`, correspondingly. * `null` for the root node. * - `node`: The current node. * - `path`: The ancestry of the current node. * * The return value of the visitor may be used to control the traversal: * - `Promise`: Must resolve to one of the following values * - `undefined` (default): Do nothing and continue * - `visit.SKIP`: Do not visit the children of this node, continue with next * sibling * - `visit.BREAK`: Terminate traversal completely * - `visit.REMOVE`: Remove the current node, then continue with the next one * - `Node`: Replace the current node, then continue by visiting it * - `number`: While iterating the items of a sequence or map, set the index * of the next step. This is useful especially if the index of the current * node has changed. * * If `visitor` is a single function, it will be called with all values * encountered in the tree, including e.g. `null` values. Alternatively, * separate visitor functions may be defined for each `Map`, `Pair`, `Seq`, * `Alias` and `Scalar` node. To define the same visitor function for more than * one node type, use the `Collection` (map and seq), `Value` (map, seq & scalar) * and `Node` (alias, map, seq & scalar) targets. Of all these, only the most * specific defined one will be used for each node. */ async function visitAsync(node, visitor) { const visitor_ = initVisitor(visitor); if (isDocument(node)) { const cd = await visitAsync_(null, node.contents, visitor_, Object.freeze([node])); if (cd === REMOVE) node.contents = null; } else await visitAsync_(null, node, visitor_, Object.freeze([])); } // Without the `as symbol` casts, TS declares these in the `visit` // namespace using `var`, but then complains about that because // `unique symbol` must be `const`. /** Terminate visit traversal completely */ visitAsync.BREAK = BREAK; /** Do not visit the children of the current node */ visitAsync.SKIP = SKIP; /** Remove the current node */ visitAsync.REMOVE = REMOVE; async function visitAsync_(key, node, visitor, path) { const ctrl = await callVisitor(key, node, visitor, path); if (isNode(ctrl) || isPair(ctrl)) { replaceNode(key, path, ctrl); return visitAsync_(key, ctrl, visitor, path); } if (typeof ctrl !== 'symbol') { if (isCollection(node)) { path = Object.freeze(path.concat(node)); for (let i = 0; i < node.items.length; ++i) { const ci = await visitAsync_(i, node.items[i], visitor, path); if (typeof ci === 'number') i = ci - 1; else if (ci === BREAK) return BREAK; else if (ci === REMOVE) { node.items.splice(i, 1); i -= 1; } } } else if (isPair(node)) { path = Object.freeze(path.concat(node)); const ck = await visitAsync_('key', node.key, visitor, path); if (ck === BREAK) return BREAK; else if (ck === REMOVE) node.key = null; const cv = await visitAsync_('value', node.value, visitor, path); if (cv === BREAK) return BREAK; else if (cv === REMOVE) node.value = null; } } return ctrl; } function initVisitor(visitor) { if (typeof visitor === 'object' && (visitor.Collection || visitor.Node || visitor.Value)) { return Object.assign({ Alias: visitor.Node, Map: visitor.Node, Scalar: visitor.Node, Seq: visitor.Node }, visitor.Value && { Map: visitor.Value, Scalar: visitor.Value, Seq: visitor.Value }, visitor.Collection && { Map: visitor.Collection, Seq: visitor.Collection }, visitor); } return visitor; } function callVisitor(key, node, visitor, path) { if (typeof visitor === 'function') return visitor(key, node, path); if (isMap(node)) return visitor.Map?.(key, node, path); if (isSeq(node)) return visitor.Seq?.(key, node, path); if (isPair(node)) return visitor.Pair?.(key, node, path); if (isScalar(node)) return visitor.Scalar?.(key, node, path); if (isAlias(node)) return visitor.Alias?.(key, node, path); return undefined; } function replaceNode(key, path, node) { const parent = path[path.length - 1]; if (isCollection(parent)) { parent.items[key] = node; } else if (isPair(parent)) { if (key === 'key') parent.key = node; else parent.value = node; } else if (isDocument(parent)) { parent.contents = node; } else { const pt = isAlias(parent) ? 'alias' : 'scalar'; throw new Error(`Cannot replace node with ${pt} parent`); } } export { visit, visitAsync };