1 | /**
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2 | * @fileoverview Rule to check for tabs inside a file
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3 | * @author Gyandeep Singh
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4 | */
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5 |
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6 | ;
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7 |
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8 | //------------------------------------------------------------------------------
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9 | // Helpers
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10 | //------------------------------------------------------------------------------
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11 |
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12 | const tabRegex = /\t+/gu;
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13 | const anyNonWhitespaceRegex = /\S/u;
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14 |
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15 | //------------------------------------------------------------------------------
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16 | // Public Interface
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17 | //------------------------------------------------------------------------------
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18 |
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19 | module.exports = {
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20 | meta: {
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21 | type: "layout",
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22 |
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23 | docs: {
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24 | description: "disallow all tabs",
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25 | category: "Stylistic Issues",
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26 | recommended: false,
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27 | url: "https://eslint.org/docs/rules/no-tabs"
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28 | },
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29 | schema: [{
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30 | type: "object",
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31 | properties: {
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32 | allowIndentationTabs: {
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33 | type: "boolean",
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34 | default: false
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35 | }
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36 | },
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37 | additionalProperties: false
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38 | }]
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39 | },
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40 |
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41 | create(context) {
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42 | const sourceCode = context.getSourceCode();
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43 | const allowIndentationTabs = context.options && context.options[0] && context.options[0].allowIndentationTabs;
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44 |
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45 | return {
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46 | Program(node) {
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47 | sourceCode.getLines().forEach((line, index) => {
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48 | let match;
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49 |
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50 | while ((match = tabRegex.exec(line)) !== null) {
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51 | if (allowIndentationTabs && !anyNonWhitespaceRegex.test(line.slice(0, match.index))) {
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52 | continue;
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53 | }
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54 |
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55 | context.report({
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56 | node,
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57 | loc: {
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58 | line: index + 1,
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59 | column: match.index
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60 | },
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61 | message: "Unexpected tab character."
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62 | });
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63 | }
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64 | });
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65 | }
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66 | };
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67 | }
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68 | };
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