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Simplify JS worker integration using tokenization detection

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Remove virtual model approach and use Monaco's built-in tokenization
to detect when cursor is in embedded JavaScript region. With
nextEmbedded, Monaco automatically syncs model content to the JS
worker, so we can call the worker directly on the model's URI
instead of creating a separate virtual model.
This commit is contained in:
Claude 2025-12-09 20:48:51 +00:00
parent a96c488593
commit 8ca12ee61a
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1 changed files with 47 additions and 99 deletions
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146
packages/monaco-json-interpolation/src/index.ts
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@ -174,6 +174,7 @@ async function getJSONWorker(resource: monaco.Uri): Promise<JSONWorker | null> {
type JSWorker = {
getCompletionsAtPosition(uri: string, offset: number): Promise<any>;
getCompletionEntryDetails(uri: string, offset: number, name: string): Promise<any>;
getQuickInfoAtPosition(uri: string, offset: number): Promise<any>;
getSignatureHelpItems(uri: string, offset: number): Promise<any>;
};
@ -195,82 +196,37 @@ async function getJavaScriptWorker(resource: monaco.Uri): Promise<JSWorker | nul
}
}
// --- Interpolation context helpers ---
// --- Check if position is inside interpolation using tokenization ---
interface InterpolationContext {
/** The full expression inside ${...} */
expression: string;
/** Offset of ${ in the document */
interpolationStart: number;
/** Offset within the expression where cursor is */
offsetInExpression: number;
/** Start line/column of the interpolation */
startPosition: { lineNumber: number; column: number };
}
function isInsideInterpolation(model: monaco.editor.ITextModel, offset: number): boolean {
// Tokenize the content and check if we're in an embedded JS region
const source = model.getValue();
const tokenLines = monaco.editor.tokenize(source, LANGUAGE_ID);
function getInterpolationContext(
model: monaco.editor.ITextModel,
position: monaco.Position
): InterpolationContext | null {
const text = model.getValue();
const offset = model.getOffsetAt(position);
// Flatten tokens and find which one contains our offset
let currentOffset = 0;
for (let lineIdx = 0; lineIdx < tokenLines.length; lineIdx++) {
const lineTokens = tokenLines[lineIdx];
const lineContent = model.getLineContent(lineIdx + 1);
// Find the ${...} that contains the current position
const beforeCursor = text.substring(0, offset);
const lastStart = beforeCursor.lastIndexOf('${');
for (let tokenIdx = 0; tokenIdx < lineTokens.length; tokenIdx++) {
const token = lineTokens[tokenIdx];
const nextToken = lineTokens[tokenIdx + 1];
const tokenStart = currentOffset + token.offset;
const tokenEnd = nextToken
? currentOffset + nextToken.offset
: currentOffset + lineContent.length;
if (lastStart === -1) {
return null;
}
// Check if there's a closing } between ${ and cursor
const betweenStartAndCursor = text.substring(lastStart + 2, offset);
if (betweenStartAndCursor.includes('}')) {
return null;
}
// Find the closing }
let depth = 1;
let endOffset = offset;
for (let i = offset; i < text.length; i++) {
if (text[i] === '{') depth++;
else if (text[i] === '}') {
depth--;
if (depth === 0) {
endOffset = i;
break;
if (offset >= tokenStart && offset <= tokenEnd) {
// Check if this token is in an embedded JavaScript region
// The embedded JS tokens won't have our language's postfix
return !token.type.endsWith('.json-interpolation') && token.type !== '';
}
}
currentOffset += lineContent.length + 1; // +1 for newline
}
// Extract the expression (content between ${ and })
const expressionStart = lastStart + 2;
const expression = text.substring(expressionStart, endOffset);
const offsetInExpression = offset - expressionStart;
const startPos = model.getPositionAt(lastStart);
return {
expression,
interpolationStart: lastStart,
offsetInExpression,
startPosition: {
lineNumber: startPos.lineNumber,
column: startPos.column
}
};
}
// --- Virtual model for JavaScript worker ---
const VIRTUAL_JS_URI = monaco.Uri.parse('file:///interpolation-context.js');
let virtualJsModel: monaco.editor.ITextModel | null = null;
function getOrCreateVirtualJsModel(): monaco.editor.ITextModel {
if (!virtualJsModel || virtualJsModel.isDisposed()) {
virtualJsModel = monaco.editor.createModel('', 'javascript', VIRTUAL_JS_URI);
}
return virtualJsModel;
return false;
}
// --- Providers ---
@ -285,25 +241,22 @@ function registerProviders(defaults: LanguageServiceDefaultsImpl): void {
position: monaco.Position,
context: monaco.languages.CompletionContext
): Promise<monaco.languages.CompletionList | null> {
// Check if we're inside an interpolation
const interpContext = getInterpolationContext(model, position);
const offset = model.getOffsetAt(position);
if (interpContext) {
// Check if we're inside an interpolation using tokenization
if (isInsideInterpolation(model, offset)) {
// Use JavaScript worker for completions inside interpolation
const jsWorker = await getJavaScriptWorker(VIRTUAL_JS_URI);
// Monaco syncs the model content automatically with nextEmbedded
const jsWorker = await getJavaScriptWorker(model.uri);
if (!jsWorker) {
return null;
}
try {
// Update the virtual model with the expression
const virtualModel = getOrCreateVirtualJsModel();
virtualModel.setValue(interpContext.expression);
// Get completions from JavaScript worker
// Get completions from JavaScript worker directly on the model's URI
const info = await jsWorker.getCompletionsAtPosition(
VIRTUAL_JS_URI.toString(),
interpContext.offsetInExpression
model.uri.toString(),
offset
);
if (!info || !info.entries) {
@ -378,25 +331,21 @@ function registerProviders(defaults: LanguageServiceDefaultsImpl): void {
model: monaco.editor.ITextModel,
position: monaco.Position
): Promise<monaco.languages.Hover | null> {
// Check if we're inside an interpolation
const interpContext = getInterpolationContext(model, position);
const offset = model.getOffsetAt(position);
if (interpContext) {
// Check if we're inside an interpolation using tokenization
if (isInsideInterpolation(model, offset)) {
// Use JavaScript worker for hover inside interpolation
const jsWorker = await getJavaScriptWorker(VIRTUAL_JS_URI);
const jsWorker = await getJavaScriptWorker(model.uri);
if (!jsWorker) {
return null;
}
try {
// Update the virtual model with the expression
const virtualModel = getOrCreateVirtualJsModel();
virtualModel.setValue(interpContext.expression);
// Get quick info from JavaScript worker
// Get quick info from JavaScript worker directly on the model's URI
const info = await jsWorker.getQuickInfoAtPosition(
VIRTUAL_JS_URI.toString(),
interpContext.offsetInExpression
model.uri.toString(),
offset
);
if (!info) {
@ -483,23 +432,22 @@ function registerProviders(defaults: LanguageServiceDefaultsImpl): void {
model: monaco.editor.ITextModel,
position: monaco.Position
): Promise<monaco.languages.SignatureHelpResult | null> {
const interpContext = getInterpolationContext(model, position);
if (!interpContext) {
const offset = model.getOffsetAt(position);
// Only provide signature help inside interpolations
if (!isInsideInterpolation(model, offset)) {
return null;
}
const jsWorker = await getJavaScriptWorker(VIRTUAL_JS_URI);
const jsWorker = await getJavaScriptWorker(model.uri);
if (!jsWorker) {
return null;
}
try {
const virtualModel = getOrCreateVirtualJsModel();
virtualModel.setValue(interpContext.expression);
const info = await jsWorker.getSignatureHelpItems(
VIRTUAL_JS_URI.toString(),
interpContext.offsetInExpression
model.uri.toString(),
offset
);
if (!info || !info.items || info.items.length === 0) {
@ -837,7 +785,7 @@ function setupDiagnostics(defaults: LanguageServiceDefaultsImpl): void {
monaco.editor.onDidCreateModel(onModelAdd);
monaco.editor.onWillDisposeModel(onModelRemoved);
monaco.editor.onDidChangeModelLanguage((event) => {
monaco.editor.onDidChangeModelLanguage((event: { model: monaco.editor.ITextModel }) => {
onModelRemoved(event.model);
onModelAdd(event.model);
});