Last change
on this file since 59329aa was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
set to
100644
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File size:
1.8 KB
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1 | var LF = '\n';
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2 | var CR = '\r';
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3 | var LinesAndColumns = (function () {
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4 | function LinesAndColumns(string) {
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5 | this.string = string;
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6 | var offsets = [0];
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7 | for (var offset = 0; offset < string.length;) {
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8 | switch (string[offset]) {
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9 | case LF:
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10 | offset += LF.length;
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11 | offsets.push(offset);
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12 | break;
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13 | case CR:
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14 | offset += CR.length;
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15 | if (string[offset] === LF) {
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16 | offset += LF.length;
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17 | }
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18 | offsets.push(offset);
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19 | break;
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20 | default:
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21 | offset++;
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22 | break;
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23 | }
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24 | }
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25 | this.offsets = offsets;
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26 | }
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27 | LinesAndColumns.prototype.locationForIndex = function (index) {
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28 | if (index < 0 || index > this.string.length) {
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29 | return null;
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30 | }
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31 | var line = 0;
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32 | var offsets = this.offsets;
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33 | while (offsets[line + 1] <= index) {
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34 | line++;
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35 | }
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36 | var column = index - offsets[line];
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37 | return { line: line, column: column };
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38 | };
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39 | LinesAndColumns.prototype.indexForLocation = function (location) {
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40 | var line = location.line, column = location.column;
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41 | if (line < 0 || line >= this.offsets.length) {
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42 | return null;
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43 | }
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44 | if (column < 0 || column > this.lengthOfLine(line)) {
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45 | return null;
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46 | }
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47 | return this.offsets[line] + column;
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48 | };
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49 | LinesAndColumns.prototype.lengthOfLine = function (line) {
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50 | var offset = this.offsets[line];
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51 | var nextOffset = line === this.offsets.length - 1 ? this.string.length : this.offsets[line + 1];
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52 | return nextOffset - offset;
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53 | };
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54 | return LinesAndColumns;
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55 | }());
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56 | export default LinesAndColumns;
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