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node_modules/eslint/lib/rules/no-mixed-spaces-and-tabs.js

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+/**
+ * @fileoverview Disallow mixed spaces and tabs for indentation
+ * @author Jary Niebur
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "disallow mixed spaces and tabs for indentation",
+            category: "Stylistic Issues",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-mixed-spaces-and-tabs"
+        },
+
+        schema: [
+            {
+                enum: ["smart-tabs", true, false]
+            }
+        ]
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        let smartTabs;
+        const ignoredLocs = [];
+
+        switch (context.options[0]) {
+            case true: // Support old syntax, maybe add deprecation warning here
+            case "smart-tabs":
+                smartTabs = true;
+                break;
+            default:
+                smartTabs = false;
+        }
+
+        /**
+         * Determines if a given line and column are before a location.
+         * @param {Location} loc The location object from an AST node.
+         * @param {int} line The line to check.
+         * @param {int} column The column to check.
+         * @returns {boolean} True if the line and column are before the location, false if not.
+         * @private
+         */
+        function beforeLoc(loc, line, column) {
+            if (line < loc.start.line) {
+                return true;
+            }
+            return line === loc.start.line && column < loc.start.column;
+        }
+
+        /**
+         * Determines if a given line and column are after a location.
+         * @param {Location} loc The location object from an AST node.
+         * @param {int} line The line to check.
+         * @param {int} column The column to check.
+         * @returns {boolean} True if the line and column are after the location, false if not.
+         * @private
+         */
+        function afterLoc(loc, line, column) {
+            if (line > loc.end.line) {
+                return true;
+            }
+            return line === loc.end.line && column > loc.end.column;
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            TemplateElement(node) {
+                ignoredLocs.push(node.loc);
+            },
+
+            "Program:exit"(node) {
+
+                /*
+                 * At least one space followed by a tab
+                 * or the reverse before non-tab/-space
+                 * characters begin.
+                 */
+                let regex = /^(?=[\t ]*(\t | \t))/u;
+                const lines = sourceCode.lines,
+                    comments = sourceCode.getAllComments();
+
+                comments.forEach(comment => {
+                    ignoredLocs.push(comment.loc);
+                });
+
+                ignoredLocs.sort((first, second) => {
+                    if (beforeLoc(first, second.start.line, second.start.column)) {
+                        return 1;
+                    }
+
+                    if (beforeLoc(second, first.start.line, second.start.column)) {
+                        return -1;
+                    }
+
+                    return 0;
+                });
+
+                if (smartTabs) {
+
+                    /*
+                     * At least one space followed by a tab
+                     * before non-tab/-space characters begin.
+                     */
+                    regex = /^(?=[\t ]* \t)/u;
+                }
+
+                lines.forEach((line, i) => {
+                    const match = regex.exec(line);
+
+                    if (match) {
+                        const lineNumber = i + 1,
+                            column = match.index + 1;
+
+                        for (let j = 0; j < ignoredLocs.length; j++) {
+                            if (beforeLoc(ignoredLocs[j], lineNumber, column)) {
+                                continue;
+                            }
+                            if (afterLoc(ignoredLocs[j], lineNumber, column)) {
+                                continue;
+                            }
+
+                            return;
+                        }
+
+                        context.report({ node, loc: { line: lineNumber, column }, message: "Mixed spaces and tabs." });
+                    }
+                });
+            }
+
+        };
+
+    }
+};