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113 lines
3.6 KiB
113 lines
3.6 KiB
/** |
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* @fileoverview Disallow mixed spaces and tabs for indentation |
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* @author Jary Niebur |
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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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/** @type {import('../shared/types').Rule} */ |
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module.exports = { |
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meta: { |
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type: "layout", |
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docs: { |
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description: "Disallow mixed spaces and tabs for indentation", |
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recommended: true, |
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url: "https://eslint.org/docs/rules/no-mixed-spaces-and-tabs" |
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}, |
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schema: [ |
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{ |
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enum: ["smart-tabs", true, false] |
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} |
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], |
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messages: { |
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mixedSpacesAndTabs: "Mixed spaces and tabs." |
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} |
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}, |
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create(context) { |
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const sourceCode = context.getSourceCode(); |
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let smartTabs; |
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switch (context.options[0]) { |
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case true: // Support old syntax, maybe add deprecation warning here |
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case "smart-tabs": |
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smartTabs = true; |
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break; |
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default: |
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smartTabs = false; |
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} |
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//-------------------------------------------------------------------------- |
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// Public |
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//-------------------------------------------------------------------------- |
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return { |
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"Program:exit"(node) { |
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const lines = sourceCode.lines, |
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comments = sourceCode.getAllComments(), |
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ignoredCommentLines = new Set(); |
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// Add all lines except the first ones. |
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comments.forEach(comment => { |
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for (let i = comment.loc.start.line + 1; i <= comment.loc.end.line; i++) { |
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ignoredCommentLines.add(i); |
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} |
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}); |
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/* |
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* At least one space followed by a tab |
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* or the reverse before non-tab/-space |
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* characters begin. |
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*/ |
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let regex = /^(?=( +|\t+))\1(?:\t| )/u; |
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if (smartTabs) { |
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/* |
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* At least one space followed by a tab |
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* before non-tab/-space characters begin. |
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*/ |
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regex = /^(?=(\t*))\1(?=( +))\2\t/u; |
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} |
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lines.forEach((line, i) => { |
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const match = regex.exec(line); |
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if (match) { |
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const lineNumber = i + 1; |
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const loc = { |
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start: { |
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line: lineNumber, |
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column: match[0].length - 2 |
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}, |
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end: { |
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line: lineNumber, |
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column: match[0].length |
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} |
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}; |
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if (!ignoredCommentLines.has(lineNumber)) { |
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const containingNode = sourceCode.getNodeByRangeIndex(sourceCode.getIndexFromLoc(loc.start)); |
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if (!(containingNode && ["Literal", "TemplateElement"].includes(containingNode.type))) { |
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context.report({ |
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node, |
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loc, |
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messageId: "mixedSpacesAndTabs" |
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}); |
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} |
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} |
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} |
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}); |
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} |
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}; |
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} |
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};
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