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accessor-pairs.js
10.95
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array-bracket-newline.js
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array-bracket-spacing.js
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array-callback-return.js
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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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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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constructor-super.js
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curly.js
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default-case.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-len.js
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max-lines-per-function.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-const-assign.js
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no-constant-condition.js
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no-continue.js
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no-control-regex.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-misleading-character-class....
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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-native-nonconstructor.j...
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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-prototype-builtins.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-return-await.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-spaced-func.js
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no-sparse-arrays.js
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no-sync.js
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no-tabs.js
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no-template-curly-in-string.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-unassigned-vars.js
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no-undef-init.js
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no-undef.js
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no-undefined.js
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no-underscore-dangle.js
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no-unexpected-multiline.js
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no-unmodified-loop-condition.j...
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no-unneeded-ternary.js
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no-unreachable-loop.js
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no-unreachable.js
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no-unsafe-finally.js
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no-unsafe-negation.js
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no-unsafe-optional-chaining.js
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no-unused-expressions.js
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no-unused-labels.js
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no-unused-vars.js
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no-use-before-define.js
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no-useless-assignment.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-warning-comments.js
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no-with.js
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nonblock-statement-body-positi...
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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-declaration-per-line.j...
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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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padded-blocks.js
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prefer-arrow-callback.js
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prefer-const.js
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prefer-destructuring.js
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prefer-exponentiation-operator...
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prefer-named-capture-group.js
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prefer-numeric-literals.js
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prefer-object-has-own.js
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prefer-reflect.js
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prefer-regex-literals.js
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prefer-rest-params.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-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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sort-imports.js
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sort-keys.js
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sort-vars.js
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space-unary-ops.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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template-curly-spacing.js
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template-tag-spacing.js
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unicode-bom.js
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use-isnan.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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wrap-regex.js
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yield-star-spacing.js
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yoda.js
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Code Editor : no-misleading-character-class.js
/** * @author Toru Nagashima <https://github.com/mysticatea> */ "use strict"; const { CALL, CONSTRUCT, ReferenceTracker, getStaticValue, getStringIfConstant, } = require("@eslint-community/eslint-utils"); const { RegExpParser, visitRegExpAST } = require("@eslint-community/regexpp"); const { isCombiningCharacter, isEmojiModifier, isRegionalIndicatorSymbol, isSurrogatePair, } = require("./utils/unicode"); const astUtils = require("./utils/ast-utils.js"); const { isValidWithUnicodeFlag } = require("./utils/regular-expressions"); const { parseStringLiteral, parseTemplateToken, } = require("./utils/char-source"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * @typedef {import('@eslint-community/regexpp').AST.Character} Character * @typedef {import('@eslint-community/regexpp').AST.CharacterClassElement} CharacterClassElement */ /** * Iterate character sequences of a given nodes. * * CharacterClassRange syntax can steal a part of character sequence, * so this function reverts CharacterClassRange syntax and restore the sequence. * @param {CharacterClassElement[]} nodes The node list to iterate character sequences. * @returns {IterableIterator<Character[]>} The list of character sequences. */ function* iterateCharacterSequence(nodes) { /** @type {Character[]} */ let seq = []; for (const node of nodes) { switch (node.type) { case "Character": seq.push(node); break; case "CharacterClassRange": seq.push(node.min); yield seq; seq = [node.max]; break; case "CharacterSet": case "CharacterClass": // [[]] nesting character class case "ClassStringDisjunction": // \q{...} case "ExpressionCharacterClass": // [A--B] if (seq.length > 0) { yield seq; seq = []; } break; // no default } } if (seq.length > 0) { yield seq; } } /** * Checks whether the given character node is a Unicode code point escape or not. * @param {Character} char the character node to check. * @returns {boolean} `true` if the character node is a Unicode code point escape. */ function isUnicodeCodePointEscape(char) { return /^\\u\{[\da-f]+\}$/iu.test(char.raw); } /** * Each function returns matched characters if it detects that kind of problem. * @type {Record<string, (chars: Character[]) => IterableIterator<Character[]>>} */ const findCharacterSequences = { *surrogatePairWithoutUFlag(chars) { for (const [index, char] of chars.entries()) { const previous = chars[index - 1]; if ( previous && char && isSurrogatePair(previous.value, char.value) && !isUnicodeCodePointEscape(previous) && !isUnicodeCodePointEscape(char) ) { yield [previous, char]; } } }, *surrogatePair(chars) { for (const [index, char] of chars.entries()) { const previous = chars[index - 1]; if ( previous && char && isSurrogatePair(previous.value, char.value) && (isUnicodeCodePointEscape(previous) || isUnicodeCodePointEscape(char)) ) { yield [previous, char]; } } }, *combiningClass(chars, unfilteredChars) { /* * When `allowEscape` is `true`, a combined character should only be allowed if the combining mark appears as an escape sequence. * This means that the base character should be considered even if it's escaped. */ for (const [index, char] of chars.entries()) { const previous = unfilteredChars[index - 1]; if ( previous && char && isCombiningCharacter(char.value) && !isCombiningCharacter(previous.value) ) { yield [previous, char]; } } }, *emojiModifier(chars) { for (const [index, char] of chars.entries()) { const previous = chars[index - 1]; if ( previous && char && isEmojiModifier(char.value) && !isEmojiModifier(previous.value) ) { yield [previous, char]; } } }, *regionalIndicatorSymbol(chars) { for (const [index, char] of chars.entries()) { const previous = chars[index - 1]; if ( previous && char && isRegionalIndicatorSymbol(char.value) && isRegionalIndicatorSymbol(previous.value) ) { yield [previous, char]; } } }, *zwj(chars) { let sequence = null; for (const [index, char] of chars.entries()) { const previous = chars[index - 1]; const next = chars[index + 1]; if ( previous && char && next && char.value === 0x200d && previous.value !== 0x200d && next.value !== 0x200d ) { if (sequence) { if (sequence.at(-1) === previous) { sequence.push(char, next); // append to the sequence } else { yield sequence; sequence = chars.slice(index - 1, index + 2); } } else { sequence = chars.slice(index - 1, index + 2); } } } if (sequence) { yield sequence; } }, }; const kinds = Object.keys(findCharacterSequences); /** * Gets the value of the given node if it's a static value other than a regular expression object, * or the node's `regex` property. * The purpose of this method is to provide a replacement for `getStaticValue` in environments where certain regular expressions cannot be evaluated. * A known example is Node.js 18 which does not support the `v` flag. * Calling `getStaticValue` on a regular expression node with the `v` flag on Node.js 18 always returns `null`. * A limitation of this method is that it can only detect a regular expression if the specified node is itself a regular expression literal node. * @param {ASTNode | undefined} node The node to be inspected. * @param {Scope} initialScope Scope to start finding variables. This function tries to resolve identifier references which are in the given scope. * @returns {{ value: any } | { regex: { pattern: string, flags: string } } | null} The static value of the node, or `null`. */ function getStaticValueOrRegex(node, initialScope) { if (!node) { return null; } if (node.type === "Literal" && node.regex) { return { regex: node.regex }; } const staticValue = getStaticValue(node, initialScope); if (staticValue?.value instanceof RegExp) { return null; } return staticValue; } /** * Checks whether a specified regexpp character is represented as an acceptable escape sequence. * This function requires the source text of the character to be known. * @param {Character} char Character to check. * @param {string} charSource Source text of the character to check. * @returns {boolean} Whether the specified regexpp character is represented as an acceptable escape sequence. */ function checkForAcceptableEscape(char, charSource) { if (!charSource.startsWith("\\")) { return false; } const match = /(?<=^\\+).$/su.exec(charSource); return match?.[0] !== String.fromCodePoint(char.value); } /** * Checks whether a specified regexpp character is represented as an acceptable escape sequence. * This function works with characters that are produced by a string or template literal. * It requires the source text and the CodeUnit list of the literal to be known. * @param {Character} char Character to check. * @param {string} nodeSource Source text of the string or template literal that produces the character. * @param {CodeUnit[]} codeUnits List of CodeUnit objects of the literal that produces the character. * @returns {boolean} Whether the specified regexpp character is represented as an acceptable escape sequence. */ function checkForAcceptableEscapeInString(char, nodeSource, codeUnits) { const firstIndex = char.start; const lastIndex = char.end - 1; const start = codeUnits[firstIndex].start; const end = codeUnits[lastIndex].end; const charSource = nodeSource.slice(start, end); return checkForAcceptableEscape(char, charSource); } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow characters which are made with multiple code points in character class syntax", recommended: true, url: "https://eslint.org/docs/latest/rules/no-misleading-character-class", }, hasSuggestions: true, schema: [ { type: "object", properties: { allowEscape: { type: "boolean", default: false, }, }, additionalProperties: false, }, ], messages: { surrogatePairWithoutUFlag: "Unexpected surrogate pair in character class. Use 'u' flag.", surrogatePair: "Unexpected surrogate pair in character class.", combiningClass: "Unexpected combined character in character class.", emojiModifier: "Unexpected modified Emoji in character class.", regionalIndicatorSymbol: "Unexpected national flag in character class.", zwj: "Unexpected joined character sequence in character class.", suggestUnicodeFlag: "Add unicode 'u' flag to regex.", }, }, create(context) { const allowEscape = context.options[0]?.allowEscape; const sourceCode = context.sourceCode; const parser = new RegExpParser(); const checkedPatternNodes = new Set(); /** * Verify a given regular expression. * @param {Node} node The node to report. * @param {string} pattern The regular expression pattern to verify. * @param {string} flags The flags of the regular expression. * @param {Function} unicodeFixer Fixer for missing "u" flag. * @returns {void} */ function verify(node, pattern, flags, unicodeFixer) { let patternNode; try { patternNode = parser.parsePattern(pattern, 0, pattern.length, { unicode: flags.includes("u"), unicodeSets: flags.includes("v"), }); } catch { // Ignore regular expressions with syntax errors return; } let codeUnits = null; /** * Checks whether a specified regexpp character is represented as an acceptable escape sequence. * For the purposes of this rule, an escape sequence is considered acceptable if it consists of one or more backslashes followed by the character being escaped. * @param {Character} char Character to check. * @returns {boolean} Whether the specified regexpp character is represented as an acceptable escape sequence. */ function isAcceptableEscapeSequence(char) { if (node.type === "Literal" && node.regex) { return checkForAcceptableEscape(char, char.raw); } if (node.type === "Literal" && typeof node.value === "string") { const nodeSource = node.raw; codeUnits ??= parseStringLiteral(nodeSource); return checkForAcceptableEscapeInString( char, nodeSource, codeUnits, ); } if (astUtils.isStaticTemplateLiteral(node)) { const nodeSource = sourceCode.getText(node); codeUnits ??= parseTemplateToken(nodeSource); return checkForAcceptableEscapeInString( char, nodeSource, codeUnits, ); } return false; } const foundKindMatches = new Map(); visitRegExpAST(patternNode, { onCharacterClassEnter(ccNode) { for (const unfilteredChars of iterateCharacterSequence( ccNode.elements, )) { let chars; if (allowEscape) { // Replace escape sequences with null to avoid having them flagged. chars = unfilteredChars.map(char => isAcceptableEscapeSequence(char) ? null : char, ); } else { chars = unfilteredChars; } for (const kind of kinds) { const matches = findCharacterSequences[kind]( chars, unfilteredChars, ); if (foundKindMatches.has(kind)) { foundKindMatches.get(kind).push(...matches); } else { foundKindMatches.set(kind, [...matches]); } } } }, }); /** * Finds the report loc(s) for a range of matches. * Only literals and expression-less templates generate granular errors. * @param {Character[][]} matches Lists of individual characters being reported on. * @returns {Location[]} locs for context.report. * @see https://github.com/eslint/eslint/pull/17515 */ function getNodeReportLocations(matches) { if ( !astUtils.isStaticTemplateLiteral(node) && node.type !== "Literal" ) { return matches.length ? [node.loc] : []; } return matches.map(chars => { const firstIndex = chars[0].start; const lastIndex = chars.at(-1).end - 1; let start; let end; if (node.type === "TemplateLiteral") { const source = sourceCode.getText(node); const offset = node.range[0]; codeUnits ??= parseTemplateToken(source); start = offset + codeUnits[firstIndex].start; end = offset + codeUnits[lastIndex].end; } else if (typeof node.value === "string") { // String Literal const source = node.raw; const offset = node.range[0]; codeUnits ??= parseStringLiteral(source); start = offset + codeUnits[firstIndex].start; end = offset + codeUnits[lastIndex].end; } else { // RegExp Literal const offset = node.range[0] + 1; // Add 1 to skip the leading slash. start = offset + firstIndex; end = offset + lastIndex + 1; } return { start: sourceCode.getLocFromIndex(start), end: sourceCode.getLocFromIndex(end), }; }); } for (const [kind, matches] of foundKindMatches) { let suggest; if (kind === "surrogatePairWithoutUFlag") { suggest = [ { messageId: "suggestUnicodeFlag", fix: unicodeFixer, }, ]; } const locs = getNodeReportLocations(matches); for (const loc of locs) { context.report({ node, loc, messageId: kind, suggest, }); } } } return { "Literal[regex]"(node) { if (checkedPatternNodes.has(node)) { return; } verify(node, node.regex.pattern, node.regex.flags, fixer => { if ( !isValidWithUnicodeFlag( context.languageOptions.ecmaVersion, node.regex.pattern, ) ) { return null; } return fixer.insertTextAfter(node, "u"); }); }, Program(node) { const scope = sourceCode.getScope(node); const tracker = new ReferenceTracker(scope); /* * Iterate calls of RegExp. * E.g., `new RegExp()`, `RegExp()`, `new window.RegExp()`, * `const {RegExp: a} = window; new a()`, etc... */ for (const { node: refNode } of tracker.iterateGlobalReferences( { RegExp: { [CALL]: true, [CONSTRUCT]: true }, }, )) { let pattern, flags; const [patternNode, flagsNode] = refNode.arguments; const evaluatedPattern = getStaticValueOrRegex( patternNode, scope, ); if (!evaluatedPattern) { continue; } if (flagsNode) { if (evaluatedPattern.regex) { pattern = evaluatedPattern.regex.pattern; checkedPatternNodes.add(patternNode); } else { pattern = String(evaluatedPattern.value); } flags = getStringIfConstant(flagsNode, scope); } else { if (evaluatedPattern.regex) { continue; } pattern = String(evaluatedPattern.value); flags = ""; } if (typeof flags === "string") { verify(patternNode, pattern, flags, fixer => { if ( !isValidWithUnicodeFlag( context.languageOptions.ecmaVersion, pattern, ) ) { return null; } if (refNode.arguments.length === 1) { const penultimateToken = sourceCode.getLastToken(refNode, { skip: 1, }); // skip closing parenthesis return fixer.insertTextAfter( penultimateToken, astUtils.isCommaToken(penultimateToken) ? ' "u",' : ', "u"', ); } if ( (flagsNode.type === "Literal" && typeof flagsNode.value === "string") || flagsNode.type === "TemplateLiteral" ) { const range = [ flagsNode.range[0], flagsNode.range[1] - 1, ]; return fixer.insertTextAfterRange(range, "u"); } return null; }); } } }, }; }, };
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