114 lines
3.6 KiB
JavaScript
114 lines
3.6 KiB
JavaScript
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/**
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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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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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category: "Stylistic Issues",
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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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