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accessor-pairs.js
11.71
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array-bracket-newline.js
9.45
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array-bracket-spacing.js
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array-callback-return.js
15.5
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array-element-newline.js
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arrow-body-style.js
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arrow-parens.js
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arrow-spacing.js
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block-scoped-var.js
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block-spacing.js
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brace-style.js
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callback-return.js
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camelcase.js
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capitalized-comments.js
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class-methods-use-this.js
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comma-dangle.js
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comma-spacing.js
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comma-style.js
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complexity.js
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computed-property-spacing.js
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consistent-return.js
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consistent-this.js
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curly.js
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default-case-last.js
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default-case.js
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default-param-last.js
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dot-location.js
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dot-notation.js
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eol-last.js
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eqeqeq.js
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for-direction.js
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func-call-spacing.js
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func-name-matching.js
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func-names.js
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func-style.js
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function-paren-newline.js
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generator-star-spacing.js
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getter-return.js
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global-require.js
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grouped-accessor-pairs.js
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guard-for-in.js
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handle-callback-err.js
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id-blacklist.js
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id-denylist.js
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id-length.js
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id-match.js
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implicit-arrow-linebreak.js
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indent-legacy.js
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indent.js
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index.js
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init-declarations.js
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jsx-quotes.js
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key-spacing.js
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keyword-spacing.js
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line-comment-position.js
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linebreak-style.js
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lines-around-comment.js
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lines-around-directive.js
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lines-between-class-members.js
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logical-assignment-operators.j...
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max-classes-per-file.js
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max-depth.js
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max-lines.js
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max-nested-callbacks.js
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max-params.js
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max-statements-per-line.js
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max-statements.js
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multiline-comment-style.js
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multiline-ternary.js
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new-cap.js
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new-parens.js
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newline-after-var.js
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newline-before-return.js
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newline-per-chained-call.js
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no-alert.js
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no-array-constructor.js
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no-async-promise-executor.js
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no-await-in-loop.js
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no-cond-assign.js
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no-confusing-arrow.js
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no-console.js
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no-continue.js
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no-control-regex.js
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no-debugger.js
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no-delete-var.js
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no-div-regex.js
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no-dupe-args.js
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no-dupe-class-members.js
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no-dupe-else-if.js
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no-dupe-keys.js
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no-duplicate-case.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-character-class.js
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no-empty-function.js
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no-empty-pattern.js
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no-empty-static-block.js
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no-empty.js
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no-eq-null.js
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no-eval.js
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no-ex-assign.js
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no-extend-native.js
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no-extra-bind.js
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no-extra-boolean-cast.js
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no-extra-label.js
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no-extra-parens.js
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no-extra-semi.js
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no-fallthrough.js
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no-floating-decimal.js
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no-func-assign.js
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no-global-assign.js
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no-implicit-coercion.js
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no-implicit-globals.js
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no-implied-eval.js
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no-import-assign.js
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no-inline-comments.js
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no-inner-declarations.js
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no-invalid-regexp.js
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no-invalid-this.js
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no-irregular-whitespace.js
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no-iterator.js
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no-label-var.js
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no-labels.js
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no-lone-blocks.js
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no-lonely-if.js
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no-loop-func.js
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no-loss-of-precision.js
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no-magic-numbers.js
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no-mixed-operators.js
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no-mixed-requires.js
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no-mixed-spaces-and-tabs.js
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no-multi-assign.js
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no-multi-spaces.js
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no-multi-str.js
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no-multiple-empty-lines.js
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no-native-reassign.js
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no-negated-condition.js
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no-negated-in-lhs.js
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no-nested-ternary.js
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no-new-func.js
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no-new-object.js
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no-new-require.js
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no-new-symbol.js
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no-new-wrappers.js
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no-new.js
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no-nonoctal-decimal-escape.js
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no-obj-calls.js
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no-object-constructor.js
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no-octal-escape.js
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no-octal.js
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no-param-reassign.js
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no-path-concat.js
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no-plusplus.js
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no-process-env.js
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no-process-exit.js
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no-promise-executor-return.js
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no-proto.js
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no-redeclare.js
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no-regex-spaces.js
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no-restricted-exports.js
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no-restricted-globals.js
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no-restricted-imports.js
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no-restricted-modules.js
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no-restricted-properties.js
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no-restricted-syntax.js
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no-return-assign.js
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no-script-url.js
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no-self-assign.js
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no-self-compare.js
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no-sequences.js
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no-setter-return.js
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no-shadow-restricted-names.js
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no-shadow.js
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no-sync.js
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no-tabs.js
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no-ternary.js
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no-this-before-super.js
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no-throw-literal.js
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no-trailing-spaces.js
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no-undef.js
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no-unexpected-multiline.js
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no-unreachable-loop.js
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no-unreachable.js
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no-unsafe-negation.js
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no-useless-backreference.js
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no-useless-call.js
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no-useless-catch.js
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no-useless-computed-key.js
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no-useless-concat.js
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no-useless-constructor.js
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no-useless-escape.js
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no-useless-rename.js
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no-useless-return.js
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no-var.js
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no-void.js
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no-with.js
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object-curly-newline.js
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object-curly-spacing.js
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object-property-newline.js
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object-shorthand.js
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one-var.js
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operator-assignment.js
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operator-linebreak.js
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prefer-spread.js
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prefer-template.js
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quote-props.js
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quotes.js
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radix.js
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require-atomic-updates.js
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require-await.js
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require-jsdoc.js
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require-unicode-regexp.js
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require-yield.js
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rest-spread-spacing.js
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semi-spacing.js
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semi-style.js
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semi.js
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spaced-comment.js
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strict.js
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switch-colon-spacing.js
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symbol-description.js
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valid-typeof.js
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vars-on-top.js
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wrap-iife.js
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Code Editor : no-useless-escape.js
/** * @fileoverview Look for useless escapes in strings and regexes * @author Onur Temizkan */ "use strict"; const astUtils = require("./utils/ast-utils"); const { RegExpParser, visitRegExpAST } = require("@eslint-community/regexpp"); /** * @typedef {import('@eslint-community/regexpp').AST.CharacterClass} CharacterClass * @typedef {import('@eslint-community/regexpp').AST.ExpressionCharacterClass} ExpressionCharacterClass */ //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** * Returns the union of two sets. * @param {Set} setA The first set * @param {Set} setB The second set * @returns {Set} The union of the two sets */ function union(setA, setB) { return new Set(function *() { yield* setA; yield* setB; }()); } const VALID_STRING_ESCAPES = union(new Set("\\nrvtbfux"), astUtils.LINEBREAKS); const REGEX_GENERAL_ESCAPES = new Set("\\bcdDfnpPrsStvwWxu0123456789]"); const REGEX_NON_CHARCLASS_ESCAPES = union(REGEX_GENERAL_ESCAPES, new Set("^/.$*+?[{}|()Bk")); /* * Set of characters that require escaping in character classes in `unicodeSets` mode. * ( ) [ ] { } / - \ | are ClassSetSyntaxCharacter */ const REGEX_CLASSSET_CHARACTER_ESCAPES = union(REGEX_GENERAL_ESCAPES, new Set("q/[{}|()-")); /* * A single character set of ClassSetReservedDoublePunctuator. * && !! ## $$ %% ** ++ ,, .. :: ;; << == >> ?? @@ ^^ `` ~~ are ClassSetReservedDoublePunctuator */ const REGEX_CLASS_SET_RESERVED_DOUBLE_PUNCTUATOR = new Set("!#$%&*+,.:;<=>?@^`~"); /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow unnecessary escape characters", recommended: true, url: "https://eslint.org/docs/latest/rules/no-useless-escape" }, hasSuggestions: true, messages: { unnecessaryEscape: "Unnecessary escape character: \\{{character}}.", removeEscape: "Remove the `\\`. This maintains the current functionality.", removeEscapeDoNotKeepSemantics: "Remove the `\\` if it was inserted by mistake.", escapeBackslash: "Replace the `\\` with `\\\\` to include the actual backslash character." }, schema: [] }, create(context) { const sourceCode = context.sourceCode; const parser = new RegExpParser(); /** * Reports a node * @param {ASTNode} node The node to report * @param {number} startOffset The backslash's offset from the start of the node * @param {string} character The uselessly escaped character (not including the backslash) * @param {boolean} [disableEscapeBackslashSuggest] `true` if escapeBackslash suggestion should be turned off. * @returns {void} */ function report(node, startOffset, character, disableEscapeBackslashSuggest) { const rangeStart = node.range[0] + startOffset; const range = [rangeStart, rangeStart + 1]; const start = sourceCode.getLocFromIndex(rangeStart); context.report({ node, loc: { start, end: { line: start.line, column: start.column + 1 } }, messageId: "unnecessaryEscape", data: { character }, suggest: [ { // Removing unnecessary `\` characters in a directive is not guaranteed to maintain functionality. messageId: astUtils.isDirective(node.parent) ? "removeEscapeDoNotKeepSemantics" : "removeEscape", fix(fixer) { return fixer.removeRange(range); } }, ...disableEscapeBackslashSuggest ? [] : [ { messageId: "escapeBackslash", fix(fixer) { return fixer.insertTextBeforeRange(range, "\\"); } } ] ] }); } /** * Checks if the escape character in given string slice is unnecessary. * @private * @param {ASTNode} node node to validate. * @param {string} match string slice to validate. * @returns {void} */ function validateString(node, match) { const isTemplateElement = node.type === "TemplateElement"; const escapedChar = match[0][1]; let isUnnecessaryEscape = !VALID_STRING_ESCAPES.has(escapedChar); let isQuoteEscape; if (isTemplateElement) { isQuoteEscape = escapedChar === "`"; if (escapedChar === "$") { // Warn if `\$` is not followed by `{` isUnnecessaryEscape = match.input[match.index + 2] !== "{"; } else if (escapedChar === "{") { /* * Warn if `\{` is not preceded by `$`. If preceded by `$`, escaping * is necessary and the rule should not warn. If preceded by `/$`, the rule * will warn for the `/$` instead, as it is the first unnecessarily escaped character. */ isUnnecessaryEscape = match.input[match.index - 1] !== "$"; } } else { isQuoteEscape = escapedChar === node.raw[0]; } if (isUnnecessaryEscape && !isQuoteEscape) { report(node, match.index, match[0].slice(1)); } } /** * Checks if the escape character in given regexp is unnecessary. * @private * @param {ASTNode} node node to validate. * @returns {void} */ function validateRegExp(node) { const { pattern, flags } = node.regex; let patternNode; const unicode = flags.includes("u"); const unicodeSets = flags.includes("v"); try { patternNode = parser.parsePattern(pattern, 0, pattern.length, { unicode, unicodeSets }); } catch { // Ignore regular expressions with syntax errors return; } /** @type {(CharacterClass | ExpressionCharacterClass)[]} */ const characterClassStack = []; visitRegExpAST(patternNode, { onCharacterClassEnter: characterClassNode => characterClassStack.unshift(characterClassNode), onCharacterClassLeave: () => characterClassStack.shift(), onExpressionCharacterClassEnter: characterClassNode => characterClassStack.unshift(characterClassNode), onExpressionCharacterClassLeave: () => characterClassStack.shift(), onCharacterEnter(characterNode) { if (!characterNode.raw.startsWith("\\")) { // It's not an escaped character. return; } const escapedChar = characterNode.raw.slice(1); if (escapedChar !== String.fromCodePoint(characterNode.value)) { // It's a valid escape. return; } let allowedEscapes; if (characterClassStack.length) { allowedEscapes = unicodeSets ? REGEX_CLASSSET_CHARACTER_ESCAPES : REGEX_GENERAL_ESCAPES; } else { allowedEscapes = REGEX_NON_CHARCLASS_ESCAPES; } if (allowedEscapes.has(escapedChar)) { return; } const reportedIndex = characterNode.start + 1; let disableEscapeBackslashSuggest = false; if (characterClassStack.length) { const characterClassNode = characterClassStack[0]; if (escapedChar === "^") { /* * The '^' character is also a special case; it must always be escaped outside of character classes, but * it only needs to be escaped in character classes if it's at the beginning of the character class. To * account for this, consider it to be a valid escape character outside of character classes, and filter * out '^' characters that appear at the start of a character class. */ if (characterClassNode.start + 1 === characterNode.start) { return; } } if (!unicodeSets) { if (escapedChar === "-") { /* * The '-' character is a special case, because it's only valid to escape it if it's in a character * class, and is not at either edge of the character class. To account for this, don't consider '-' * characters to be valid in general, and filter out '-' characters that appear in the middle of a * character class. */ if (characterClassNode.start + 1 !== characterNode.start && characterNode.end !== characterClassNode.end - 1) { return; } } } else { // unicodeSets mode if (REGEX_CLASS_SET_RESERVED_DOUBLE_PUNCTUATOR.has(escapedChar)) { // Escaping is valid if it is a ClassSetReservedDoublePunctuator. if (pattern[characterNode.end] === escapedChar) { return; } if (pattern[characterNode.start - 1] === escapedChar) { if (escapedChar !== "^") { return; } // If the previous character is a `negate` caret(`^`), escape to caret is unnecessary. if (!characterClassNode.negate) { return; } const negateCaretIndex = characterClassNode.start + 1; if (negateCaretIndex < characterNode.start - 1) { return; } } } if (characterNode.parent.type === "ClassIntersection" || characterNode.parent.type === "ClassSubtraction") { disableEscapeBackslashSuggest = true; } } } report( node, reportedIndex, escapedChar, disableEscapeBackslashSuggest ); } }); } /** * Checks if a node has an escape. * @param {ASTNode} node node to check. * @returns {void} */ function check(node) { const isTemplateElement = node.type === "TemplateElement"; if ( isTemplateElement && node.parent && node.parent.parent && node.parent.parent.type === "TaggedTemplateExpression" && node.parent === node.parent.parent.quasi ) { // Don't report tagged template literals, because the backslash character is accessible to the tag function. return; } if (typeof node.value === "string" || isTemplateElement) { /* * JSXAttribute doesn't have any escape sequence: https://facebook.github.io/jsx/. * In addition, backticks are not supported by JSX yet: https://github.com/facebook/jsx/issues/25. */ if (node.parent.type === "JSXAttribute" || node.parent.type === "JSXElement" || node.parent.type === "JSXFragment") { return; } const value = isTemplateElement ? sourceCode.getText(node) : node.raw; const pattern = /\\[^\d]/gu; let match; while ((match = pattern.exec(value))) { validateString(node, match); } } else if (node.regex) { validateRegExp(node); } } return { Literal: check, TemplateElement: check }; } };
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