1 | /**
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2 | * @fileoverview Rule to require sorting of variables within a single Variable Declaration block
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3 | * @author Ilya Volodin
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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 | // Rule Definition
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10 | //------------------------------------------------------------------------------
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11 |
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12 | module.exports = {
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13 | meta: {
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14 | type: "suggestion",
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15 |
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16 | docs: {
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17 | description: "require variables within the same declaration block to be sorted",
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18 | category: "Stylistic Issues",
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19 | recommended: false,
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20 | url: "https://eslint.org/docs/rules/sort-vars"
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21 | },
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22 |
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23 | schema: [
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24 | {
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25 | type: "object",
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26 | properties: {
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27 | ignoreCase: {
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28 | type: "boolean",
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29 | default: false
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30 | }
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31 | },
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32 | additionalProperties: false
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33 | }
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34 | ],
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35 |
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36 | fixable: "code"
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37 | },
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38 |
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39 | create(context) {
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40 |
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41 | const configuration = context.options[0] || {},
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42 | ignoreCase = configuration.ignoreCase || false,
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43 | sourceCode = context.getSourceCode();
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44 |
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45 | return {
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46 | VariableDeclaration(node) {
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47 | const idDeclarations = node.declarations.filter(decl => decl.id.type === "Identifier");
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48 | const getSortableName = ignoreCase ? decl => decl.id.name.toLowerCase() : decl => decl.id.name;
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49 | const unfixable = idDeclarations.some(decl => decl.init !== null && decl.init.type !== "Literal");
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50 | let fixed = false;
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51 |
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52 | idDeclarations.slice(1).reduce((memo, decl) => {
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53 | const lastVariableName = getSortableName(memo),
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54 | currentVariableName = getSortableName(decl);
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55 |
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56 | if (currentVariableName < lastVariableName) {
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57 | context.report({
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58 | node: decl,
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59 | message: "Variables within the same declaration block should be sorted alphabetically.",
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60 | fix(fixer) {
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61 | if (unfixable || fixed) {
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62 | return null;
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63 | }
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64 | return fixer.replaceTextRange(
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65 | [idDeclarations[0].range[0], idDeclarations[idDeclarations.length - 1].range[1]],
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66 | idDeclarations
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67 |
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68 | // Clone the idDeclarations array to avoid mutating it
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69 | .slice()
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70 |
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71 | // Sort the array into the desired order
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72 | .sort((declA, declB) => {
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73 | const aName = getSortableName(declA);
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74 | const bName = getSortableName(declB);
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75 |
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76 | return aName > bName ? 1 : -1;
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77 | })
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78 |
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79 | // Build a string out of the sorted list of identifier declarations and the text between the originals
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80 | .reduce((sourceText, identifier, index) => {
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81 | const textAfterIdentifier = index === idDeclarations.length - 1
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82 | ? ""
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83 | : sourceCode.getText().slice(idDeclarations[index].range[1], idDeclarations[index + 1].range[0]);
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84 |
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85 | return sourceText + sourceCode.getText(identifier) + textAfterIdentifier;
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86 | }, "")
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87 |
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88 | );
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89 | }
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90 | });
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91 | fixed = true;
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92 | return memo;
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93 | }
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94 | return decl;
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95 |
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96 | }, idDeclarations[0]);
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97 | }
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98 | };
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99 | }
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100 | };
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