99 lines
2.5 KiB
JavaScript
99 lines
2.5 KiB
JavaScript
// @flow
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import Parser from "./index";
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import UtilParser from "./util";
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import { SourceLocation, type Position } from "../util/location";
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import type { Comment, Node as NodeType, NodeBase } from "../types";
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// Start an AST node, attaching a start offset.
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const commentKeys = ["leadingComments", "trailingComments", "innerComments"];
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class Node implements NodeBase {
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constructor(parser: Parser, pos: number, loc: Position) {
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this.type = "";
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this.start = pos;
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this.end = 0;
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this.loc = new SourceLocation(loc);
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if (parser && parser.options.ranges) this.range = [pos, 0];
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if (parser && parser.filename) this.loc.filename = parser.filename;
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}
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type: string;
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start: number;
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end: number;
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loc: SourceLocation;
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range: [number, number];
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leadingComments: Array<Comment>;
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trailingComments: Array<Comment>;
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innerComments: Array<Comment>;
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extra: { [key: string]: any };
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__clone(): this {
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// $FlowIgnore
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const node2: any = new Node();
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Object.keys(this).forEach(key => {
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// Do not clone comments that are already attached to the node
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if (commentKeys.indexOf(key) < 0) {
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// $FlowIgnore
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node2[key] = this[key];
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}
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});
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return node2;
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}
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}
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export class NodeUtils extends UtilParser {
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startNode<T: NodeType>(): T {
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// $FlowIgnore
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return new Node(this, this.state.start, this.state.startLoc);
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}
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startNodeAt<T: NodeType>(pos: number, loc: Position): T {
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// $FlowIgnore
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return new Node(this, pos, loc);
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}
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/** Start a new node with a previous node's location. */
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startNodeAtNode<T: NodeType>(type: NodeType): T {
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return this.startNodeAt(type.start, type.loc.start);
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}
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// Finish an AST node, adding `type` and `end` properties.
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finishNode<T: NodeType>(node: T, type: string): T {
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return this.finishNodeAt(
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node,
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type,
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this.state.lastTokEnd,
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this.state.lastTokEndLoc,
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);
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}
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// Finish node at given position
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finishNodeAt<T: NodeType>(
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node: T,
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type: string,
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pos: number,
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loc: Position,
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): T {
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node.type = type;
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node.end = pos;
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node.loc.end = loc;
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if (this.options.ranges) node.range[1] = pos;
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this.processComment(node);
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return node;
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}
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/**
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* Reset the start location of node to the start location of locationNode
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*/
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resetStartLocationFromNode(node: NodeBase, locationNode: NodeBase): void {
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node.start = locationNode.start;
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node.loc.start = locationNode.loc.start;
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if (this.options.ranges) node.range[0] = locationNode.range[0];
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}
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}
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