return handleEvent(context, offset, (nestedMode:IMode, context:ILineContext, offset:number) => {
			if (this._modeId === nestedMode.getId()) {

				// Always complete on empty line
				if (context.getTokenCount() === 0) {
					return true;
				}

				var tokenIndex = context.findIndexOfOffset(offset - 1);
				var tokenType = context.getTokenType(tokenIndex);

				for (var i = 0; i < this._autoClosingPairs.length; ++i) {
					if (this._autoClosingPairs[i].open === character) {
						if (this._autoClosingPairs[i].notIn) {
							for (var notInIndex = 0; notInIndex < this._autoClosingPairs[i].notIn.length; ++notInIndex) {
								if (tokenType.indexOf(this._autoClosingPairs[i].notIn[notInIndex]) > -1) {
									return false;
								}
							}
						}
						break;
					}
				}

				return true;
			} else if (nestedMode.richEditSupport && nestedMode.richEditSupport.characterPair) {
				return nestedMode.richEditSupport.characterPair.shouldAutoClosePair(character, context, offset);
			} else {
				return null;
			}
		});

		return handleEvent(context, offset, (nestedMode:IMode, context:ILineContext, offset:number) => {
			if (this._modeId === nestedMode.getId()) {
				return true;
			} else if (nestedMode.suggestSupport) {
				return nestedMode.suggestSupport.shouldAutotriggerSuggest(context, offset, triggeredByCharacter);
			} else {
				return false;
			}
		});

		return handleEvent(context, offset, (nestedMode:IMode, context:ILineContext, offset:number) => {
			if (this._modeId === nestedMode.getId()) {
				return (!Array.isArray(this.contribution.tokens) ||
					this.contribution.tokens.length < 1 ||
					isLineToken(context, offset, this.contribution.tokens));
			} else if (nestedMode.declarationSupport) {
				return nestedMode.declarationSupport.canFindDeclaration(context, offset);
			} else {
				return false;
			}
		});

	/**
	 * Do an initial pass over the lines and gather info about the line comment string.
	 * Returns null if any of the lines doesn't support a line comment string.
	 */
	public static _gatherPreflightCommentStrings(model:editorCommon.ITokenizedModel, startLineNumber: number, endLineNumber: number): ILinePreflightData[] {
		var lines: ILinePreflightData[] = [],
			config:ICommentsConfiguration,
			commentStr:string,
			seenModes: {[modeId:string]:string;} = Object.create(null),
			i:number,
			lineCount:number,
			lineNumber:number,
			mode: IMode,
			modeId: string;

		for (i = 0, lineCount = endLineNumber - startLineNumber + 1; i < lineCount; i++) {
			lineNumber = startLineNumber + i;
			mode = model.getModeAtPosition(lineNumber, 1);
			modeId = mode.getId();

			// Find the commentStr for this line, if none is found then bail out: we cannot do line comments
			if (seenModes[modeId]) {
				commentStr = seenModes[modeId];
			} else {
				config = (mode.richEditSupport ? mode.richEditSupport.comments : null);
				commentStr = (config ? config.lineCommentToken : null);
				if (!commentStr) {
					// Mode does not support line comments
					return null;
				}

				seenModes[modeId] = commentStr;
			}

			lines.push({
				ignore: false,
				commentStr: commentStr,
				commentStrOffset: 0,
				commentStrLength: commentStr.length
			});
		}

		return lines;
	}

		return handleEvent(context, offset, (nestedMode:IMode, context:ILineContext, offset:number) => {
			if (this._modeId === nestedMode.getId()) {
				if (!Array.isArray(this.contribution.excludeTokens)) {
					return true;
				}
				if (this.contribution.excludeTokens.length === 1 && this.contribution.excludeTokens[0] === '*') {
					return false;
				}
				return !isLineToken(context, offset-1, this.contribution.excludeTokens);
			} else if (nestedMode.parameterHintsSupport) {
				return nestedMode.parameterHintsSupport.shouldTriggerParameterHints(context, offset);
			} else {
				return false;
			}
		});

	private static _safeGetWordDefinition(mode:IMode): RegExp {
		return LanguageConfigurationRegistry.getWordDefinition(mode.getId());
	}

	constructor(startIndex:number, mode:IMode) {
		this.startIndex = startIndex|0;
		this.mode = mode;
		this.modeId = mode.getId();
	}

		return new TPromise<void>((c, e, p) => {
			listener = target.addSupportChangedListener((e) => {
				if (e.tokenizationSupport) {
					stopListening();
					c(void 0);
				}
			});
		}, stopListening);