export function _lastWordPartEnd(str: string, startIndex: number = str.length - 1): number {
	let ignoreUpperCase = !strings.isLowerAsciiLetter(str.charCodeAt(startIndex + 1));
	for (let i = startIndex; i >= 0; i--) {
		let chCode = str.charCodeAt(i);
		if (chCode === CharCode.Space || chCode === CharCode.Tab || (!ignoreUpperCase && strings.isUpperAsciiLetter(chCode)) || chCode === CharCode.Underline) {
			return i - 1;
		}
		if (ignoreUpperCase && i < startIndex && strings.isLowerAsciiLetter(chCode)) {
			return i;
		}
		ignoreUpperCase = ignoreUpperCase && strings.isUpperAsciiLetter(chCode);
	}
	return -1;
}

	private _addInWordRanges(bucket: SelectionRange[], model: ITextModel, pos: Position): void {
		const obj = model.getWordAtPosition(pos);
		if (!obj) {
			return;
		}
		let { word, startColumn } = obj;
		let offset = pos.column - startColumn;
		let lastCh: number = 0;
		for (; offset < word.length; offset++) {
			let ch = word.charCodeAt(offset);
			if (isUpperAsciiLetter(ch) && isLowerAsciiLetter(lastCh)) {
				// fooBar
				// ^^^
				// ^^^^^^
				bucket.push({ range: new Range(pos.lineNumber, startColumn, pos.lineNumber, startColumn + offset), kind: 'statement.word.part' });
			} else if (ch === CharCode.Underline && lastCh !== CharCode.Underline) {
				// foo_bar
				// ^^^
				// ^^^^^^^
				bucket.push({ range: new Range(pos.lineNumber, startColumn, pos.lineNumber, startColumn + offset), kind: 'statement.word.part' });
				offset += 1;
			}
			lastCh = ch;
		}
	}

	private _addInWordRanges(bucket: SelectionRange[], model: ITextModel, pos: Position): void {
		const obj = model.getWordAtPosition(pos);
		if (!obj) {
			return;
		}

		let { word, startColumn } = obj;
		let offset = pos.column - startColumn;
		let start = offset;
		let end = offset;
		let lastCh: number = 0;

		// LEFT anchor (start)
		for (; start >= 0; start--) {
			let ch = word.charCodeAt(start);
			if (ch === CharCode.Underline || ch === CharCode.Dash) {
				// foo-bar OR foo_bar
				break;
			} else if (isLowerAsciiLetter(ch) && isUpperAsciiLetter(lastCh)) {
				// fooBar
				break;
			}
			lastCh = ch;
		}
		start += 1;

		// RIGHT anchor (end)
		for (; end < word.length; end++) {
			let ch = word.charCodeAt(end);
			if (isUpperAsciiLetter(ch) && isLowerAsciiLetter(lastCh)) {
				// fooBar
				break;
			} else if (ch === CharCode.Underline || ch === CharCode.Dash) {
				// foo-bar OR foo_bar
				break;
			}
			lastCh = ch;
		}

		if (start < end) {
			bucket.push({ range: new Range(pos.lineNumber, startColumn + start, pos.lineNumber, startColumn + end), kind: 'statement.word.part' });
		}
	}

export function _nextWordPartBegin(str: string, startIndex: number = 0): number {
	let prevChCode = str.charCodeAt(startIndex - 1);
	let chCode = str.charCodeAt(startIndex);
	// handle the special case ' X' and ' x' which is different from the standard methods
	if ((prevChCode === CharCode.Space || prevChCode === CharCode.Tab) && (strings.isLowerAsciiLetter(chCode) || strings.isUpperAsciiLetter(chCode))) {
		return startIndex + 1;
	}
	let ignoreUpperCase = strings.isUpperAsciiLetter(chCode);
	for (let i = startIndex; i < str.length; ++i) {
		chCode = str.charCodeAt(i);
		if (chCode === CharCode.Space || chCode === CharCode.Tab || (!ignoreUpperCase && strings.isUpperAsciiLetter(chCode))) {
			return i + 1;
		}
		if (ignoreUpperCase && strings.isLowerAsciiLetter(chCode)) {
			return i; // multiple UPPERCase : assume an upper case word and a CamelCase word - like DSLModel
		}
		ignoreUpperCase = ignoreUpperCase && strings.isUpperAsciiLetter(chCode);
		if (chCode === CharCode.Underline) {
			return i + 2;
		}
	}
	return str.length + 1;
}

	public static _moveWordPartRight(model: ICursorSimpleModel, position: Position): Position {
		const lineNumber = position.lineNumber;
		const maxColumn = model.getLineMaxColumn(lineNumber);

		if (position.column === maxColumn) {
			return (lineNumber < model.getLineCount() ? new Position(lineNumber + 1, 1) : position);
		}

		const lineContent = model.getLineContent(lineNumber);
		for (let column = position.column + 1; column < maxColumn; column++) {
			const left = lineContent.charCodeAt(column - 2);
			const right = lineContent.charCodeAt(column - 1);

			if (left === CharCode.Underline && right !== CharCode.Underline) {
				// snake_case_variables
				return new Position(lineNumber, column);
			}

			if (strings.isLowerAsciiLetter(left) && strings.isUpperAsciiLetter(right)) {
				// camelCaseVariables
				return new Position(lineNumber, column);
			}

			if (strings.isUpperAsciiLetter(left) && strings.isUpperAsciiLetter(right)) {
				// thisIsACamelCaseWithOneLetterWords
				if (column + 1 < maxColumn) {
					const rightRight = lineContent.charCodeAt(column);
					if (strings.isLowerAsciiLetter(rightRight)) {
						return new Position(lineNumber, column);
					}
				}
			}
		}

		return new Position(lineNumber, maxColumn);
	}

export function _nextWordPartBegin(str: string, startIndex: number = str.length - 1): number {
	const checkLowerCase = str.charCodeAt(startIndex - 1) === CharCode.Space; // does a lc char count as a part start?
	for (let i = startIndex; i < str.length; ++i) {
		let chCode = str.charCodeAt(i);
		if (chCode === CharCode.Space || chCode === CharCode.Tab || strings.isUpperAsciiLetter(chCode) || (checkLowerCase && strings.isLowerAsciiLetter(chCode))) {
			return i + 1;
		}
		if (chCode === CharCode.Underline) {
			return i + 2;
		}
	}
	return str.length + 1;
}