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/**
* @fileoverview Disallow mixed spaces and tabs for indentation
* @author Jary Niebur
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow mixed spaces and tabs for indentation",
category: "Stylistic Issues",
recommended: true
},
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))/;
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)/;
}
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." });
}
});
}
};
}
};
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