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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
'use strict';
import { createScanner } from './scanner';
export function format(documentText, range, options) {
var initialIndentLevel;
var formatText;
var formatTextStart;
var rangeStart;
var rangeEnd;
if (range) {
rangeStart = range.offset;
rangeEnd = rangeStart + range.length;
formatTextStart = rangeStart;
while (formatTextStart > 0 && !isEOL(documentText, formatTextStart - 1)) {
formatTextStart--;
}
var endOffset = rangeEnd;
while (endOffset < documentText.length && !isEOL(documentText, endOffset)) {
endOffset++;
}
formatText = documentText.substring(formatTextStart, endOffset);
initialIndentLevel = computeIndentLevel(formatText, options);
}
else {
formatText = documentText;
initialIndentLevel = 0;
formatTextStart = 0;
rangeStart = 0;
rangeEnd = documentText.length;
}
var eol = getEOL(options, documentText);
var lineBreak = false;
var indentLevel = 0;
var indentValue;
if (options.insertSpaces) {
indentValue = repeat(' ', options.tabSize || 4);
}
else {
indentValue = '\t';
}
var scanner = createScanner(formatText, false);
var hasError = false;
function newLineAndIndent() {
return eol + repeat(indentValue, initialIndentLevel + indentLevel);
}
function scanNext() {
var token = scanner.scan();
lineBreak = false;
while (token === 15 /* Trivia */ || token === 14 /* LineBreakTrivia */) {
lineBreak = lineBreak || (token === 14 /* LineBreakTrivia */);
token = scanner.scan();
}
hasError = token === 16 /* Unknown */ || scanner.getTokenError() !== 0 /* None */;
return token;
}
var editOperations = [];
function addEdit(text, startOffset, endOffset) {
if (!hasError && (!range || (startOffset < rangeEnd && endOffset > rangeStart)) && documentText.substring(startOffset, endOffset) !== text) {
editOperations.push({ offset: startOffset, length: endOffset - startOffset, content: text });
}
}
var firstToken = scanNext();
if (firstToken !== 17 /* EOF */) {
var firstTokenStart = scanner.getTokenOffset() + formatTextStart;
var initialIndent = repeat(indentValue, initialIndentLevel);
addEdit(initialIndent, formatTextStart, firstTokenStart);
}
while (firstToken !== 17 /* EOF */) {
var firstTokenEnd = scanner.getTokenOffset() + scanner.getTokenLength() + formatTextStart;
var secondToken = scanNext();
var replaceContent = '';
var needsLineBreak = false;
while (!lineBreak && (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */)) {
// comments on the same line: keep them on the same line, but ignore them otherwise
var commentTokenStart = scanner.getTokenOffset() + formatTextStart;
addEdit(' ', firstTokenEnd, commentTokenStart);
firstTokenEnd = scanner.getTokenOffset() + scanner.getTokenLength() + formatTextStart;
needsLineBreak = secondToken === 12 /* LineCommentTrivia */;
replaceContent = needsLineBreak ? newLineAndIndent() : '';
secondToken = scanNext();
}
if (secondToken === 2 /* CloseBraceToken */) {
if (firstToken !== 1 /* OpenBraceToken */) {
indentLevel--;
replaceContent = newLineAndIndent();
}
}
else if (secondToken === 4 /* CloseBracketToken */) {
if (firstToken !== 3 /* OpenBracketToken */) {
indentLevel--;
replaceContent = newLineAndIndent();
}
}
else {
switch (firstToken) {
case 3 /* OpenBracketToken */:
case 1 /* OpenBraceToken */:
indentLevel++;
replaceContent = newLineAndIndent();
break;
case 5 /* CommaToken */:
case 12 /* LineCommentTrivia */:
replaceContent = newLineAndIndent();
break;
case 13 /* BlockCommentTrivia */:
if (lineBreak) {
replaceContent = newLineAndIndent();
}
else if (!needsLineBreak) {
// symbol following comment on the same line: keep on same line, separate with ' '
replaceContent = ' ';
}
break;
case 6 /* ColonToken */:
if (!needsLineBreak) {
replaceContent = ' ';
}
break;
case 10 /* StringLiteral */:
if (secondToken === 6 /* ColonToken */) {
if (!needsLineBreak) {
replaceContent = '';
}
break;
}
// fall through
case 7 /* NullKeyword */:
case 8 /* TrueKeyword */:
case 9 /* FalseKeyword */:
case 11 /* NumericLiteral */:
case 2 /* CloseBraceToken */:
case 4 /* CloseBracketToken */:
if (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */) {
if (!needsLineBreak) {
replaceContent = ' ';
}
}
else if (secondToken !== 5 /* CommaToken */ && secondToken !== 17 /* EOF */) {
hasError = true;
}
break;
case 16 /* Unknown */:
hasError = true;
break;
}
if (lineBreak && (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */)) {
replaceContent = newLineAndIndent();
}
}
if (secondToken === 17 /* EOF */) {
replaceContent = options.insertFinalNewline ? eol : '';
}
var secondTokenStart = scanner.getTokenOffset() + formatTextStart;
addEdit(replaceContent, firstTokenEnd, secondTokenStart);
firstToken = secondToken;
}
return editOperations;
}
function repeat(s, count) {
var result = '';
for (var i = 0; i < count; i++) {
result += s;
}
return result;
}
function computeIndentLevel(content, options) {
var i = 0;
var nChars = 0;
var tabSize = options.tabSize || 4;
while (i < content.length) {
var ch = content.charAt(i);
if (ch === ' ') {
nChars++;
}
else if (ch === '\t') {
nChars += tabSize;
}
else {
break;
}
i++;
}
return Math.floor(nChars / tabSize);
}
function getEOL(options, text) {
for (var i = 0; i < text.length; i++) {
var ch = text.charAt(i);
if (ch === '\r') {
if (i + 1 < text.length && text.charAt(i + 1) === '\n') {
return '\r\n';
}
return '\r';
}
else if (ch === '\n') {
return '\n';
}
}
return (options && options.eol) || '\n';
}
export function isEOL(text, offset) {
return '\r\n'.indexOf(text.charAt(offset)) !== -1;
}