1 /*---------------------------------------------------------------------------------------------
2 * Copyright (c) Microsoft Corporation. All rights reserved.
3 * Licensed under the MIT License. See License.txt in the project root for license information.
4 *--------------------------------------------------------------------------------------------*/
6 import { createScanner } from './scanner';
7 export function format(documentText, range, options) {
8 var initialIndentLevel;
14 rangeStart = range.offset;
15 rangeEnd = rangeStart + range.length;
16 formatTextStart = rangeStart;
17 while (formatTextStart > 0 && !isEOL(documentText, formatTextStart - 1)) {
20 var endOffset = rangeEnd;
21 while (endOffset < documentText.length && !isEOL(documentText, endOffset)) {
24 formatText = documentText.substring(formatTextStart, endOffset);
25 initialIndentLevel = computeIndentLevel(formatText, options);
28 formatText = documentText;
29 initialIndentLevel = 0;
32 rangeEnd = documentText.length;
34 var eol = getEOL(options, documentText);
35 var lineBreak = false;
38 if (options.insertSpaces) {
39 indentValue = repeat(' ', options.tabSize || 4);
44 var scanner = createScanner(formatText, false);
46 function newLineAndIndent() {
47 return eol + repeat(indentValue, initialIndentLevel + indentLevel);
50 var token = scanner.scan();
52 while (token === 15 /* Trivia */ || token === 14 /* LineBreakTrivia */) {
53 lineBreak = lineBreak || (token === 14 /* LineBreakTrivia */);
54 token = scanner.scan();
56 hasError = token === 16 /* Unknown */ || scanner.getTokenError() !== 0 /* None */;
59 var editOperations = [];
60 function addEdit(text, startOffset, endOffset) {
61 if (!hasError && (!range || (startOffset < rangeEnd && endOffset > rangeStart)) && documentText.substring(startOffset, endOffset) !== text) {
62 editOperations.push({ offset: startOffset, length: endOffset - startOffset, content: text });
65 var firstToken = scanNext();
66 if (firstToken !== 17 /* EOF */) {
67 var firstTokenStart = scanner.getTokenOffset() + formatTextStart;
68 var initialIndent = repeat(indentValue, initialIndentLevel);
69 addEdit(initialIndent, formatTextStart, firstTokenStart);
71 while (firstToken !== 17 /* EOF */) {
72 var firstTokenEnd = scanner.getTokenOffset() + scanner.getTokenLength() + formatTextStart;
73 var secondToken = scanNext();
74 var replaceContent = '';
75 var needsLineBreak = false;
76 while (!lineBreak && (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */)) {
77 // comments on the same line: keep them on the same line, but ignore them otherwise
78 var commentTokenStart = scanner.getTokenOffset() + formatTextStart;
79 addEdit(' ', firstTokenEnd, commentTokenStart);
80 firstTokenEnd = scanner.getTokenOffset() + scanner.getTokenLength() + formatTextStart;
81 needsLineBreak = secondToken === 12 /* LineCommentTrivia */;
82 replaceContent = needsLineBreak ? newLineAndIndent() : '';
83 secondToken = scanNext();
85 if (secondToken === 2 /* CloseBraceToken */) {
86 if (firstToken !== 1 /* OpenBraceToken */) {
88 replaceContent = newLineAndIndent();
91 else if (secondToken === 4 /* CloseBracketToken */) {
92 if (firstToken !== 3 /* OpenBracketToken */) {
94 replaceContent = newLineAndIndent();
99 case 3 /* OpenBracketToken */:
100 case 1 /* OpenBraceToken */:
102 replaceContent = newLineAndIndent();
104 case 5 /* CommaToken */:
105 case 12 /* LineCommentTrivia */:
106 replaceContent = newLineAndIndent();
108 case 13 /* BlockCommentTrivia */:
110 replaceContent = newLineAndIndent();
112 else if (!needsLineBreak) {
113 // symbol following comment on the same line: keep on same line, separate with ' '
114 replaceContent = ' ';
117 case 6 /* ColonToken */:
118 if (!needsLineBreak) {
119 replaceContent = ' ';
122 case 10 /* StringLiteral */:
123 if (secondToken === 6 /* ColonToken */) {
124 if (!needsLineBreak) {
130 case 7 /* NullKeyword */:
131 case 8 /* TrueKeyword */:
132 case 9 /* FalseKeyword */:
133 case 11 /* NumericLiteral */:
134 case 2 /* CloseBraceToken */:
135 case 4 /* CloseBracketToken */:
136 if (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */) {
137 if (!needsLineBreak) {
138 replaceContent = ' ';
141 else if (secondToken !== 5 /* CommaToken */ && secondToken !== 17 /* EOF */) {
145 case 16 /* Unknown */:
149 if (lineBreak && (secondToken === 12 /* LineCommentTrivia */ || secondToken === 13 /* BlockCommentTrivia */)) {
150 replaceContent = newLineAndIndent();
153 if (secondToken === 17 /* EOF */) {
154 replaceContent = options.insertFinalNewline ? eol : '';
156 var secondTokenStart = scanner.getTokenOffset() + formatTextStart;
157 addEdit(replaceContent, firstTokenEnd, secondTokenStart);
158 firstToken = secondToken;
160 return editOperations;
162 function repeat(s, count) {
164 for (var i = 0; i < count; i++) {
169 function computeIndentLevel(content, options) {
172 var tabSize = options.tabSize || 4;
173 while (i < content.length) {
174 var ch = content.charAt(i);
178 else if (ch === '\t') {
186 return Math.floor(nChars / tabSize);
188 function getEOL(options, text) {
189 for (var i = 0; i < text.length; i++) {
190 var ch = text.charAt(i);
192 if (i + 1 < text.length && text.charAt(i + 1) === '\n') {
197 else if (ch === '\n') {
201 return (options && options.eol) || '\n';
203 export function isEOL(text, offset) {
204 return '\r\n'.indexOf(text.charAt(offset)) !== -1;