public static createInternalEditorOptions()

in src/vs/editor/common/config/editorOptions.ts [2245:2398]
137 lines of code
20 McCabe index (conditional complexity)

	public static createInternalEditorOptions(env: IEnvironmentalOptions, _opts: IValidatedEditorOptions) {

		let accessibilitySupport: AccessibilitySupport;
		if (_opts.accessibilitySupport === 'auto') {
			// The editor reads the `accessibilitySupport` from the environment
			accessibilitySupport = env.accessibilitySupport;
		} else if (_opts.accessibilitySupport === 'on') {
			accessibilitySupport = AccessibilitySupport.Enabled;
		} else {
			accessibilitySupport = AccessibilitySupport.Disabled;
		}

		// Disable some non critical features to get as best performance as possible
		// See https://github.com/Microsoft/vscode/issues/26730
		const opts = this._tweakValidatedOptions(_opts, accessibilitySupport);

		let lineDecorationsWidth: number;
		if (typeof opts.lineDecorationsWidth === 'string' && /^\d+(\.\d+)?ch$/.test(opts.lineDecorationsWidth)) {
			const multiple = parseFloat(opts.lineDecorationsWidth.substr(0, opts.lineDecorationsWidth.length - 2));
			lineDecorationsWidth = multiple * env.fontInfo.typicalHalfwidthCharacterWidth;
		} else {
			lineDecorationsWidth = _clampedInt(opts.lineDecorationsWidth, 0, 0, 1000);
		}
		if (opts.contribInfo.folding) {
			lineDecorationsWidth += 16;
		}

		const layoutInfo = EditorLayoutProvider.compute({
			outerWidth: env.outerWidth,
			outerHeight: env.outerHeight,
			showGlyphMargin: opts.viewInfo.glyphMargin,
			lineHeight: env.fontInfo.lineHeight,
			showLineNumbers: (opts.viewInfo.renderLineNumbers !== RenderLineNumbersType.Off),
			lineNumbersMinChars: opts.lineNumbersMinChars,
			lineNumbersDigitCount: env.lineNumbersDigitCount,
			lineDecorationsWidth: lineDecorationsWidth,
			typicalHalfwidthCharacterWidth: env.fontInfo.typicalHalfwidthCharacterWidth,
			maxDigitWidth: env.fontInfo.maxDigitWidth,
			verticalScrollbarWidth: opts.viewInfo.scrollbar.verticalScrollbarSize,
			horizontalScrollbarHeight: opts.viewInfo.scrollbar.horizontalScrollbarSize,
			scrollbarArrowSize: opts.viewInfo.scrollbar.arrowSize,
			verticalScrollbarHasArrows: opts.viewInfo.scrollbar.verticalHasArrows,
			minimap: opts.viewInfo.minimap.enabled,
			minimapSide: opts.viewInfo.minimap.side,
			minimapRenderCharacters: opts.viewInfo.minimap.renderCharacters,
			minimapMaxColumn: opts.viewInfo.minimap.maxColumn,
			pixelRatio: env.pixelRatio
		});

		let bareWrappingInfo: { isWordWrapMinified: boolean; isViewportWrapping: boolean; wrappingColumn: number; } | null = null;
		{
			const wordWrap = opts.wordWrap;
			const wordWrapColumn = opts.wordWrapColumn;
			const wordWrapMinified = opts.wordWrapMinified;

			if (accessibilitySupport === AccessibilitySupport.Enabled) {
				// See https://github.com/Microsoft/vscode/issues/27766
				// Never enable wrapping when a screen reader is attached
				// because arrow down etc. will not move the cursor in the way
				// a screen reader expects.
				bareWrappingInfo = {
					isWordWrapMinified: false,
					isViewportWrapping: false,
					wrappingColumn: -1
				};
			} else if (wordWrapMinified && env.isDominatedByLongLines) {
				// Force viewport width wrapping if model is dominated by long lines
				bareWrappingInfo = {
					isWordWrapMinified: true,
					isViewportWrapping: true,
					wrappingColumn: Math.max(1, layoutInfo.viewportColumn)
				};
			} else if (wordWrap === 'on') {
				bareWrappingInfo = {
					isWordWrapMinified: false,
					isViewportWrapping: true,
					wrappingColumn: Math.max(1, layoutInfo.viewportColumn)
				};
			} else if (wordWrap === 'bounded') {
				bareWrappingInfo = {
					isWordWrapMinified: false,
					isViewportWrapping: true,
					wrappingColumn: Math.min(Math.max(1, layoutInfo.viewportColumn), wordWrapColumn)
				};
			} else if (wordWrap === 'wordWrapColumn') {
				bareWrappingInfo = {
					isWordWrapMinified: false,
					isViewportWrapping: false,
					wrappingColumn: wordWrapColumn
				};
			} else {
				bareWrappingInfo = {
					isWordWrapMinified: false,
					isViewportWrapping: false,
					wrappingColumn: -1
				};
			}
		}

		const wrappingInfo: EditorWrappingInfo = {
			inDiffEditor: opts.inDiffEditor,
			isDominatedByLongLines: env.isDominatedByLongLines,
			isWordWrapMinified: bareWrappingInfo.isWordWrapMinified,
			isViewportWrapping: bareWrappingInfo.isViewportWrapping,
			wrappingColumn: bareWrappingInfo.wrappingColumn,
			wrappingIndent: opts.wrappingIndent,
			wordWrapBreakBeforeCharacters: opts.wordWrapBreakBeforeCharacters,
			wordWrapBreakAfterCharacters: opts.wordWrapBreakAfterCharacters,
			wordWrapBreakObtrusiveCharacters: opts.wordWrapBreakObtrusiveCharacters,
		};

		let className = 'monaco-editor';
		if (opts.viewInfo.extraEditorClassName) {
			className += ' ' + opts.viewInfo.extraEditorClassName;
		}
		if (env.extraEditorClassName) {
			className += ' ' + env.extraEditorClassName;
		}
		if (opts.viewInfo.fontLigatures) {
			className += ' enable-ligatures';
		}
		if (opts.mouseStyle === 'default') {
			className += ' mouse-default';
		} else if (opts.mouseStyle === 'copy') {
			className += ' mouse-copy';
		}

		return new InternalEditorOptions({
			canUseLayerHinting: opts.disableLayerHinting ? false : true,
			pixelRatio: env.pixelRatio,
			editorClassName: className,
			lineHeight: env.fontInfo.lineHeight,
			readOnly: opts.readOnly,
			accessibilitySupport: accessibilitySupport,
			multiCursorModifier: opts.multiCursorModifier,
			multiCursorMergeOverlapping: opts.multiCursorMergeOverlapping,
			wordSeparators: opts.wordSeparators,
			autoClosingBrackets: opts.autoClosingBrackets,
			autoClosingQuotes: opts.autoClosingQuotes,
			autoSurround: opts.autoSurround,
			autoIndent: opts.autoIndent,
			useTabStops: opts.useTabStops,
			tabFocusMode: opts.readOnly ? true : env.tabFocusMode,
			dragAndDrop: opts.dragAndDrop,
			emptySelectionClipboard: opts.emptySelectionClipboard && env.emptySelectionClipboard,
			copyWithSyntaxHighlighting: opts.copyWithSyntaxHighlighting,
			layoutInfo: layoutInfo,
			fontInfo: env.fontInfo,
			viewInfo: opts.viewInfo,
			wrappingInfo: wrappingInfo,
			contribInfo: opts.contribInfo,
			showUnused: opts.showUnused,
		});
	}