src/vs/editor/common/model/tokenizationTextModelPart.ts/TokenizationTextModelPart/_getLineTokens
class TokenizationTextModelPart:	private _getLineTokens(lineNumber: number): LineTokens {
		const lineText = this._textModel.getLineContent(lineNumber);
		const syntacticTokens = this._tokens.getTokens(
			this._languageId,
			lineNumber - 1,
			lineText
		);
		return this._semanticTokens.addSparseTokens(lineNumber, syntacticTokens);
	}