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Parser.ts
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Parser.ts
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import * as vscode from 'vscode';
import { fetchResource } from './file';
import { stripQuotes } from './util';
import Parser = require('web-tree-sitter');
const WHITESPACE_RE = /\s/;
async function initTreeSitter(context: vscode.ExtensionContext) {
await Parser.init({
locateFile(path: string, prefix: string) {
const uri = vscode.Uri.joinPath(context.extensionUri, 'dist', path);
return uri.toString(true);
},
});
}
async function loadLanguage(context: vscode.ExtensionContext) {
const wasmBinary = await fetchResource(context, 'dist/tree-sitter-devicetree.wasm');
return await Parser.Language.load(wasmBinary);
}
async function createParser(context: vscode.ExtensionContext) {
await initTreeSitter(context);
const parser = new Parser();
const language = await loadLanguage(context);
parser.setLanguage(language);
return { parser, language };
}
export interface ParseChangedEvent {
document: vscode.TextDocument;
}
/**
* Parses `.keymap` files.
*/
export class KeymapParser implements vscode.Disposable {
static async init(context: vscode.ExtensionContext): Promise<KeymapParser> {
const { parser, language } = await createParser(context);
return new KeymapParser(parser, language);
}
private _onDidChangeParse = new vscode.EventEmitter<ParseChangedEvent>();
public onDidChangeParse = this._onDidChangeParse.event;
private disposable: vscode.Disposable;
private trees: Record<string, Parser.Tree> = {};
private constructor(
private parser: Parser,
private language: Parser.Language,
) {
this.disposable = vscode.Disposable.from(
vscode.workspace.onDidCloseTextDocument((document) => this.deleteTree(document)),
vscode.workspace.onDidChangeTextDocument((e) => this.updateTree(e)),
);
}
dispose() {
this.disposable.dispose();
}
/**
* Returns an up-to-date parse tree for a document.
*/
parse(document: vscode.TextDocument): Parser.Tree {
return this.trees[document.uri.toString()] ?? this.openDocument(document);
}
/**
* Builds a tree-sitter query for keymap files.
*/
query(expression: string): Parser.Query {
return this.language.query(expression);
}
private getTree(document: vscode.TextDocument): Parser.Tree | undefined {
return this.trees[document.uri.toString()];
}
private setTree(document: vscode.TextDocument, tree: Parser.Tree): Parser.Tree {
this.trees[document.uri.toString()] = tree;
this._onDidChangeParse.fire({ document });
return tree;
}
private deleteTree(document: vscode.TextDocument) {
delete this.trees[document.uri.toString()];
}
private getParserInput(document: vscode.TextDocument): Parser.Input {
return (index, startPosition) => {
if (startPosition && startPosition.row < document.lineCount) {
const line = document.lineAt(startPosition.row);
return line.text.slice(startPosition.column);
}
return null;
};
}
private openDocument(document: vscode.TextDocument): Parser.Tree {
return this.setTree(document, this.parser.parse(document.getText()));
}
private updateTree(e: vscode.TextDocumentChangeEvent) {
const tree = this.getTree(e.document);
if (!tree) {
return;
}
for (const change of e.contentChanges) {
const startIndex = change.rangeOffset;
const oldEndIndex = change.rangeOffset + change.rangeLength;
const newEndIndex = change.rangeOffset + change.text.length;
const startPosition = asPoint(e.document.positionAt(startIndex));
const oldEndPosition = asPoint(e.document.positionAt(oldEndIndex));
const newEndPosition = asPoint(e.document.positionAt(newEndIndex));
tree.edit({ startIndex, oldEndIndex, newEndIndex, startPosition, oldEndPosition, newEndPosition });
}
// TODO: figure out how to make this work to be more efficient.
// const newTree = this.parser.parse(this.getParserInput(e.document), tree);
const newTree = this.parser.parse(e.document.getText(), tree);
this.setTree(e.document, newTree);
}
}
/**
* Converts a vscode position to a tree-sitter point.
*/
export function asPoint(position: vscode.Position): Parser.Point {
return { row: position.line, column: position.character };
}
/**
* Converts a tree-sitter point to a vscode position.
*/
export function asPosition(point: Parser.Point): vscode.Position {
return new vscode.Position(point.row, point.column);
}
/**
* Returns whether two nodes are equal.
* TODO: replace this with a.equals(b) once tree-sitter's equals() is fixed.
*/
export function nodesEqual(a: Parser.SyntaxNode, b: Parser.SyntaxNode): boolean {
type NodeWithId = Parser.SyntaxNode & { id: number };
return (a as NodeWithId).id === (b as NodeWithId).id;
}
/**
* Returns whether `node` is a descendant of `other`.
*/
export function isDescendantOf(node: Parser.SyntaxNode, other: Parser.SyntaxNode): boolean {
let current: Parser.SyntaxNode | null = node;
while (current) {
if (nodesEqual(current, other)) {
return true;
}
current = current.parent;
}
return false;
}
/**
* Finds a position inside the first non-whitespace token which is before the
* given position.
*/
export function findPreviousToken(
document: vscode.TextDocument,
position: vscode.Position,
): vscode.Position | undefined {
const line = document.lineAt(position.line);
for (let i = position.character - 1; i >= 0; i--) {
const char = line.text[i];
if (char !== undefined && !WHITESPACE_RE.test(char)) {
return position.with({ character: i });
}
}
return undefined;
}
/**
* Gets the named descendant of `root` at a position.
*/
export function nodeAtPosition(root: Parser.SyntaxNode, position: vscode.Position): Parser.SyntaxNode {
const point = asPoint(position);
return root.namedDescendantForPosition(point);
}
/**
* Returns the closest ancestor that has a given node type.
*/
export function getAncesorOfType(node: Parser.SyntaxNode | null, type: string): Parser.SyntaxNode | null {
while (node && node.type !== type) {
node = node.parent;
}
return node;
}
/**
* Gets the start/end position of a node as a vscode range.
*/
export function getNodeRange(node: Parser.SyntaxNode): vscode.Range {
return new vscode.Range(asPosition(node.startPosition), asPosition(node.endPosition));
}
/**
* Gets the name of the DeviceTree property which includes the given node,
* or `undefined` if it is not part of a property.
*/
export function getPropertyName(node: Parser.SyntaxNode): string | undefined {
const prop = getAncesorOfType(node, 'property');
return prop?.childForFieldName('name')?.text;
}
/**
* Gets the "compatible" property of the DeviceTree node which includes the given node,
* or `undefined` if it is not part of a node with such a property.
*/
export function getCompatible(node: Parser.SyntaxNode): string | undefined {
const dtNode = getAncesorOfType(node, 'node');
const properties = dtNode?.descendantsOfType('property');
const compatible = properties?.find((x) => x.childForFieldName('name')?.text === 'compatible');
const value = compatible?.childForFieldName('value');
return value ? stripQuotes(value.text) : undefined;
}