2 * @fileoverview Rule to disallow whitespace that is not a tab or space, whitespace inside strings and comments are allowed
3 * @author Jonathan Kingston
4 * @author Christophe Porteneuve
9 //------------------------------------------------------------------------------
11 //------------------------------------------------------------------------------
13 const astUtils = require("./utils/ast-utils");
15 //------------------------------------------------------------------------------
17 //------------------------------------------------------------------------------
19 const ALL_IRREGULARS = /[\f\v\u0085\ufeff\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u202f\u205f\u3000\u2028\u2029]/u;
20 const IRREGULAR_WHITESPACE = /[\f\v\u0085\ufeff\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u202f\u205f\u3000]+/mgu;
21 const IRREGULAR_LINE_TERMINATORS = /[\u2028\u2029]/mgu;
22 const LINE_BREAK = astUtils.createGlobalLinebreakMatcher();
24 //------------------------------------------------------------------------------
26 //------------------------------------------------------------------------------
33 description: "disallow irregular whitespace",
34 category: "Possible Errors",
36 url: "https://eslint.org/docs/rules/no-irregular-whitespace"
60 additionalProperties: false
65 noIrregularWhitespace: "Irregular whitespace not allowed."
71 // Module store of errors that we have found
74 // Lookup the `skipComments` option, which defaults to `false`.
75 const options = context.options[0] || {};
76 const skipComments = !!options.skipComments;
77 const skipStrings = options.skipStrings !== false;
78 const skipRegExps = !!options.skipRegExps;
79 const skipTemplates = !!options.skipTemplates;
81 const sourceCode = context.getSourceCode();
82 const commentNodes = sourceCode.getAllComments();
85 * Removes errors that occur inside the given node
86 * @param {ASTNode} node to check for matching errors.
90 function removeWhitespaceError(node) {
91 const locStart = node.loc.start;
92 const locEnd = node.loc.end;
94 errors = errors.filter(({ loc: { start: errorLocStart } }) => (
95 errorLocStart.line < locStart.line ||
96 errorLocStart.line === locStart.line && errorLocStart.column < locStart.column ||
97 errorLocStart.line === locEnd.line && errorLocStart.column >= locEnd.column ||
98 errorLocStart.line > locEnd.line
103 * Checks identifier or literal nodes for errors that we are choosing to ignore and calls the relevant methods to remove the errors
104 * @param {ASTNode} node to check for matching errors.
108 function removeInvalidNodeErrorsInIdentifierOrLiteral(node) {
109 const shouldCheckStrings = skipStrings && (typeof node.value === "string");
110 const shouldCheckRegExps = skipRegExps && Boolean(node.regex);
112 if (shouldCheckStrings || shouldCheckRegExps) {
114 // If we have irregular characters remove them from the errors list
115 if (ALL_IRREGULARS.test(node.raw)) {
116 removeWhitespaceError(node);
122 * Checks template string literal nodes for errors that we are choosing to ignore and calls the relevant methods to remove the errors
123 * @param {ASTNode} node to check for matching errors.
127 function removeInvalidNodeErrorsInTemplateLiteral(node) {
128 if (typeof node.value.raw === "string") {
129 if (ALL_IRREGULARS.test(node.value.raw)) {
130 removeWhitespaceError(node);
136 * Checks comment nodes for errors that we are choosing to ignore and calls the relevant methods to remove the errors
137 * @param {ASTNode} node to check for matching errors.
141 function removeInvalidNodeErrorsInComment(node) {
142 if (ALL_IRREGULARS.test(node.value)) {
143 removeWhitespaceError(node);
148 * Checks the program source for irregular whitespace
149 * @param {ASTNode} node The program node
153 function checkForIrregularWhitespace(node) {
154 const sourceLines = sourceCode.lines;
156 sourceLines.forEach((sourceLine, lineIndex) => {
157 const lineNumber = lineIndex + 1;
160 while ((match = IRREGULAR_WHITESPACE.exec(sourceLine)) !== null) {
163 messageId: "noIrregularWhitespace",
171 column: match.index + match[0].length
180 * Checks the program source for irregular line terminators
181 * @param {ASTNode} node The program node
185 function checkForIrregularLineTerminators(node) {
186 const source = sourceCode.getText(),
187 sourceLines = sourceCode.lines,
188 linebreaks = source.match(LINE_BREAK);
189 let lastLineIndex = -1,
192 while ((match = IRREGULAR_LINE_TERMINATORS.exec(source)) !== null) {
193 const lineIndex = linebreaks.indexOf(match[0], lastLineIndex + 1) || 0;
197 messageId: "noIrregularWhitespace",
201 column: sourceLines[lineIndex].length
210 lastLineIndex = lineIndex;
215 * A no-op function to act as placeholder for comment accumulation when the `skipComments` option is `false`.
223 if (ALL_IRREGULARS.test(sourceCode.getText())) {
224 nodes.Program = function(node) {
227 * As we can easily fire warnings for all white space issues with
228 * all the source its simpler to fire them here.
229 * This means we can check all the application code without having
230 * to worry about issues caused in the parser tokens.
231 * When writing this code also evaluating per node was missing out
232 * connecting tokens in some cases.
233 * We can later filter the errors when they are found to be not an
234 * issue in nodes we don't care about.
236 checkForIrregularWhitespace(node);
237 checkForIrregularLineTerminators(node);
240 nodes.Identifier = removeInvalidNodeErrorsInIdentifierOrLiteral;
241 nodes.Literal = removeInvalidNodeErrorsInIdentifierOrLiteral;
242 nodes.TemplateElement = skipTemplates ? removeInvalidNodeErrorsInTemplateLiteral : noop;
243 nodes["Program:exit"] = function() {
246 // First strip errors occurring in comment nodes.
247 commentNodes.forEach(removeInvalidNodeErrorsInComment);
250 // If we have any errors remaining report on them
251 errors.forEach(error => context.report(error));
254 nodes.Program = noop;