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indentationGuesser.ts ×18

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13 tests · 40710 LOC · 238 files · introduces 0 tests · 125 LOC · 2 files

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19 ranges125 lines · 2 files
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2 files ranked by introduced lines: 125 introduced LOC across 19 ranges. Expand a file to inspect source; the > gutter marks introduced lines.

src/vs/editor/common/model/indentationGuesser.ts 115 introduced LOC · 18 ranges

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7 import { ITextBuffer } from '../model.js';
8
9 > class SpacesDiffResult { indentationGuesser.ts
10 > public spacesDiff: number = 0;
11 > public looksLikeAlignment: boolean = false;
12 }
13
15 * Compute the diff in spaces between two line's indentation.
16 */
17 > function spacesDiff(a: string, aLength: number, b: string, bLength: number, result: SpacesDiffResult): void { indentationGuesser.ts
18 >
19 > result.spacesDiff = 0;
20 > result.looksLikeAlignment = false;
21 >
22 > // This can go both ways (e.g.):
23 > // - a: "\t"
24 > // - b: "\t "
25 > // => This should count 1 tab and 4 spaces
26 >
27 > let i: number;
28 >
29 > for (i = 0; i < aLength && i < bLength; i++) {
30 const aCharCode = a.charCodeAt(i);
31 const bCharCode = b.charCodeAt(i);
35 }
36 }
37 > indentationGuesser.ts
38 > let aSpacesCnt = 0, aTabsCount = 0;
39 > for (let j = i; j < aLength; j++) {
40 const aCharCode = a.charCodeAt(j);
41 if (aCharCode === CharCode.Space) {
45 }
46 }
47 > indentationGuesser.ts
48 > let bSpacesCnt = 0, bTabsCount = 0;
49 > for (let j = i; j < bLength; j++) {
50 const bCharCode = b.charCodeAt(j);
51 if (bCharCode === CharCode.Space) {
55 }
56 }
57 > indentationGuesser.ts
58 > if (aSpacesCnt > 0 && aTabsCount > 0) {
59 return;
60 }
61 > if (bSpacesCnt > 0 && bTabsCount > 0) { indentationGuesser.ts
62 return;
63 }
64 > indentationGuesser.ts
65 > const tabsDiff = Math.abs(aTabsCount - bTabsCount);
66 > const spacesDiff = Math.abs(aSpacesCnt - bSpacesCnt);
67 >
68 > if (tabsDiff === 0) {
69 > // check if the indentation difference might be caused by alignment reasons
70 > // sometime folks like to align their code, but this should not be used as a hint
71 > result.spacesDiff = spacesDiff;
72 >
73 > if (spacesDiff > 0 && 0 <= bSpacesCnt - 1 && bSpacesCnt - 1 < a.length && bSpacesCnt < b.length) {
74 if (b.charCodeAt(bSpacesCnt) !== CharCode.Space && a.charCodeAt(bSpacesCnt - 1) === CharCode.Space) {
75 if (a.charCodeAt(a.length - 1) === CharCode.Comma) {
104
105 export function guessIndentation(source: ITextBuffer, defaultTabSize: number, defaultInsertSpaces: boolean): IGuessedIndentation {
106 > // Look at most at the first 10k lines indentationGuesser.ts
107 > const linesCount = Math.min(source.getLineCount(), 10000);
108 >
109 > let linesIndentedWithTabsCount = 0; // number of lines that contain at least one tab in indentation
110 > let linesIndentedWithSpacesCount = 0; // number of lines that contain only spaces in indentation
111 >
112 > let previousLineText = ''; // content of latest line that contained non-whitespace chars
113 > let previousLineIndentation = 0; // index at which latest line contained the first non-whitespace char
114 >
115 > const ALLOWED_TAB_SIZE_GUESSES = [2, 4, 6, 8, 3, 5, 7]; // prefer even guesses for `tabSize`, limit to [2, 8].
116 > const MAX_ALLOWED_TAB_SIZE_GUESS = 8; // max(ALLOWED_TAB_SIZE_GUESSES) = 8
117 >
118 > const spacesDiffCount = [0, 0, 0, 0, 0, 0, 0, 0, 0]; // `tabSize` scores
119 > const tmp = new SpacesDiffResult();
120 >
121 > for (let lineNumber = 1; lineNumber <= linesCount; lineNumber++) {
122 > const currentLineLength = source.getLineLength(lineNumber);
123 > const currentLineText = source.getLineContent(lineNumber);
124 >
125 > // if the text buffer is chunk based, so long lines are cons-string, v8 will flattern the string when we check charCode.
126 > // checking charCode on chunks directly is cheaper.
127 > const useCurrentLineText = (currentLineLength <= 65536);
128 >
129 > let currentLineHasContent = false; // does `currentLineText` contain non-whitespace chars
130 > let currentLineIndentation = 0; // index at which `currentLineText` contains the first non-whitespace char
131 > let currentLineSpacesCount = 0; // count of spaces found in `currentLineText` indentation
132 > let currentLineTabsCount = 0; // count of tabs found in `currentLineText` indentation
133 > for (let j = 0, lenJ = currentLineLength; j < lenJ; j++) {
134 > const charCode = (useCurrentLineText ? currentLineText.charCodeAt(j) : source.getLineCharCode(lineNumber, j));
135 >
136 > if (charCode === CharCode.Tab) {
137 currentLineTabsCount++;
138 > } else if (charCode === CharCode.Space) { indentationGuesser.ts
139 currentLineSpacesCount++;
140 > } else { indentationGuesser.ts
141 > // Hit non whitespace character on this line
142 > currentLineHasContent = true;
143 > currentLineIndentation = j;
144 > break;
145 > }
146 > }
147 >
148 > // Ignore empty or only whitespace lines
149 > if (!currentLineHasContent) {
150 continue;
151 }
152 > indentationGuesser.ts
153 > if (currentLineTabsCount > 0) {
154 linesIndentedWithTabsCount++;
155 > } else if (currentLineSpacesCount > 1) { indentationGuesser.ts
156 linesIndentedWithSpacesCount++;
157 }
158 > indentationGuesser.ts
159 > spacesDiff(previousLineText, previousLineIndentation, currentLineText, currentLineIndentation, tmp);
160 >
161 > if (tmp.looksLikeAlignment) {
162 // if defaultInsertSpaces === true && the spaces count == tabSize, we may want to count it as valid indentation
163 //
174 }
175 }
176 > indentationGuesser.ts
177 > const currentSpacesDiff = tmp.spacesDiff;
178 > if (currentSpacesDiff <= MAX_ALLOWED_TAB_SIZE_GUESS) {
179 > spacesDiffCount[currentSpacesDiff]++;
180 > }
181 >
182 > previousLineText = currentLineText;
183 > previousLineIndentation = currentLineIndentation;
184 > }
185 >
186 > let insertSpaces = defaultInsertSpaces;
187 > if (linesIndentedWithTabsCount !== linesIndentedWithSpacesCount) {
188 insertSpaces = (linesIndentedWithTabsCount < linesIndentedWithSpacesCount);
189 }
190 > indentationGuesser.ts
191 > let tabSize = defaultTabSize;
192 >
193 > // Guess tabSize only if inserting spaces...
194 > if (insertSpaces) {
195 let tabSizeScore = 0;
196 ALLOWED_TAB_SIZE_GUESSES.forEach((possibleTabSize) => {
209 }
210 }
211 > indentationGuesser.ts
212 > // console.log('--------------------------');
213 > // console.log('linesIndentedWithTabsCount: ' + linesIndentedWithTabsCount + ', linesIndentedWithSpacesCount: ' + linesIndentedWithSpacesCount);
214 > // console.log('spacesDiffCount: ' + spacesDiffCount);
215 > // console.log('tabSize: ' + tabSize + ', tabSizeScore: ' + tabSizeScore);
216 >
217 > return {
218 > insertSpaces: insertSpaces,
219 > tabSize: tabSize
220 > };
221 > }
src/vs/editor/common/model/textModel.ts 10 introduced LOC · 1 range

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205 public static resolveOptions(textBuffer: model.ITextBuffer, options: model.ITextModelCreationOptions): model.TextModelResolvedOptions {
206 if (options.detectIndentation) {
207 > const guessedIndentation = guessIndentation(textBuffer, options.tabSize, options.insertSpaces); textModel.ts
208 > return new model.TextModelResolvedOptions({
209 > tabSize: guessedIndentation.tabSize,
210 > indentSize: 'tabSize', // TODO@Alex: guess indentSize independent of tabSize
211 > insertSpaces: guessedIndentation.insertSpaces,
212 > trimAutoWhitespace: options.trimAutoWhitespace,
213 > defaultEOL: options.defaultEOL,
214 > bracketPairColorizationOptions: options.bracketPairColorizationOptions,
215 > });
216 > }
217
218 return new model.TextModelResolvedOptions(options);

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