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node.ts
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node.ts
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import type Parser from "./index";
import UtilParser from "./util";
import { SourceLocation, type Position } from "../util/location";
import type { Comment, Node as NodeType, NodeBase } from "../types";
// Start an AST node, attaching a start offset.
class Node implements NodeBase {
constructor(parser: Parser, pos: number, loc: Position) {
this.start = pos;
this.end = 0;
this.loc = new SourceLocation(loc);
if (parser?.options.ranges) this.range = [pos, 0];
if (parser?.filename) this.loc.filename = parser.filename;
}
type: string = "";
declare start: number;
declare end: number;
declare loc: SourceLocation;
declare range: [number, number];
declare leadingComments: Array<Comment>;
declare trailingComments: Array<Comment>;
declare innerComments: Array<Comment>;
declare extra: {
[key: string]: any;
};
}
const NodePrototype = Node.prototype;
if (!process.env.BABEL_8_BREAKING) {
// @ts-expect-error
NodePrototype.__clone = function (): Node {
// @ts-expect-error
const newNode: any = new Node();
const keys = Object.keys(this);
for (let i = 0, length = keys.length; i < length; i++) {
const key = keys[i];
// Do not clone comments that are already attached to the node
if (
key !== "leadingComments" &&
key !== "trailingComments" &&
key !== "innerComments"
) {
newNode[key] =
// @ts-expect-error: key must present in this
this[key];
}
}
return newNode;
};
}
function clonePlaceholder(node: any): any {
return cloneIdentifier(node);
}
export function cloneIdentifier(node: any): any {
// We don't need to clone `typeAnnotations` and `optional`: because
// cloneIdentifier is only used in object shorthand and named import/export.
// Neither of them allow type annotations after the identifier or optional identifier
const { type, start, end, loc, range, extra, name } = node;
const cloned = Object.create(NodePrototype);
cloned.type = type;
cloned.start = start;
cloned.end = end;
cloned.loc = loc;
cloned.range = range;
cloned.extra = extra;
cloned.name = name;
if (type === "Placeholder") {
cloned.expectedNode = node.expectedNode;
}
return cloned;
}
export function cloneStringLiteral(node: any): any {
const { type, start, end, loc, range, extra } = node;
if (type === "Placeholder") {
return clonePlaceholder(node);
}
const cloned = Object.create(NodePrototype);
cloned.type = type;
cloned.start = start;
cloned.end = end;
cloned.loc = loc;
cloned.range = range;
if (node.raw !== undefined) {
// estree set node.raw instead of node.extra
cloned.raw = node.raw;
} else {
cloned.extra = extra;
}
cloned.value = node.value;
return cloned;
}
export type Undone<T extends NodeType> = Omit<T, "type">;
export abstract class NodeUtils extends UtilParser {
startNode<T extends NodeType>(): Undone<T> {
// @ts-expect-error
return new Node(this, this.state.start, this.state.startLoc);
}
startNodeAt<T extends NodeType>(pos: number, loc: Position): Undone<T> {
// @ts-expect-error
return new Node(this, pos, loc);
}
/** Start a new node with a previous node's location. */
startNodeAtNode<T extends NodeType>(type: Undone<NodeType>): Undone<T> {
return this.startNodeAt(type.start, type.loc.start);
}
// Finish an AST node, adding `type` and `end` properties.
finishNode<T extends NodeType>(node: Undone<T>, type: T["type"]): T {
return this.finishNodeAt(node, type, this.state.lastTokEndLoc);
}
// Finish node at given position
finishNodeAt<T extends NodeType>(
node: Omit<T, "type">,
type: T["type"],
endLoc: Position,
): T {
if (process.env.NODE_ENV !== "production" && node.end > 0) {
throw new Error(
"Do not call finishNode*() twice on the same node." +
" Instead use resetEndLocation() or change type directly.",
);
}
// @ts-expect-error migrate to Babel types AST typings
node.type = type;
// @ts-expect-error migrate to Babel types AST typings
node.end = endLoc.index;
node.loc.end = endLoc;
if (this.options.ranges) node.range[1] = endLoc.index;
if (this.options.attachComment) this.processComment(node as T);
return node as T;
}
resetStartLocation(node: NodeBase, start: number, startLoc: Position): void {
node.start = start;
node.loc.start = startLoc;
if (this.options.ranges) node.range[0] = start;
}
resetEndLocation(
node: NodeBase,
endLoc: Position = this.state.lastTokEndLoc,
): void {
node.end = endLoc.index;
node.loc.end = endLoc;
if (this.options.ranges) node.range[1] = endLoc.index;
}
/**
* Reset the start location of node to the start location of locationNode
*/
resetStartLocationFromNode(node: NodeBase, locationNode: NodeBase): void {
this.resetStartLocation(node, locationNode.start, locationNode.loc.start);
}
}