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105 lines
4 KiB
JavaScript
105 lines
4 KiB
JavaScript
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/**
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* @fileoverview Rule to require sorting of variables within a single Variable Declaration block
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "require variables within the same declaration block to be sorted",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/sort-vars"
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},
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schema: [
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{
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type: "object",
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properties: {
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ignoreCase: {
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type: "boolean",
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default: false
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}
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},
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additionalProperties: false
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}
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],
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fixable: "code",
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messages: {
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sortVars: "Variables within the same declaration block should be sorted alphabetically."
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}
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},
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create(context) {
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const configuration = context.options[0] || {},
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ignoreCase = configuration.ignoreCase || false,
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sourceCode = context.getSourceCode();
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return {
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VariableDeclaration(node) {
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const idDeclarations = node.declarations.filter(decl => decl.id.type === "Identifier");
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const getSortableName = ignoreCase ? decl => decl.id.name.toLowerCase() : decl => decl.id.name;
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const unfixable = idDeclarations.some(decl => decl.init !== null && decl.init.type !== "Literal");
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let fixed = false;
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idDeclarations.slice(1).reduce((memo, decl) => {
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const lastVariableName = getSortableName(memo),
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currentVariableName = getSortableName(decl);
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if (currentVariableName < lastVariableName) {
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context.report({
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node: decl,
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messageId: "sortVars",
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fix(fixer) {
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if (unfixable || fixed) {
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return null;
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}
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return fixer.replaceTextRange(
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[idDeclarations[0].range[0], idDeclarations[idDeclarations.length - 1].range[1]],
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idDeclarations
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// Clone the idDeclarations array to avoid mutating it
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.slice()
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// Sort the array into the desired order
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.sort((declA, declB) => {
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const aName = getSortableName(declA);
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const bName = getSortableName(declB);
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return aName > bName ? 1 : -1;
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})
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// Build a string out of the sorted list of identifier declarations and the text between the originals
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.reduce((sourceText, identifier, index) => {
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const textAfterIdentifier = index === idDeclarations.length - 1
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? ""
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: sourceCode.getText().slice(idDeclarations[index].range[1], idDeclarations[index + 1].range[0]);
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return sourceText + sourceCode.getText(identifier) + textAfterIdentifier;
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}, "")
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);
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}
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});
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fixed = true;
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return memo;
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}
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return decl;
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}, idDeclarations[0]);
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}
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};
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}
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};
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