120 lines
3.5 KiB
JavaScript
120 lines
3.5 KiB
JavaScript
/**
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* @fileoverview Rule to flag bitwise identifiers
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* @author Nicholas C. Zakas
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*/
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"use strict";
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/*
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*
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* Set of bitwise operators.
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*
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*/
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const BITWISE_OPERATORS = [
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"^", "|", "&", "<<", ">>", ">>>",
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"^=", "|=", "&=", "<<=", ">>=", ">>>=",
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"~"
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];
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "disallow bitwise operators",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/no-bitwise"
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},
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schema: [
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{
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type: "object",
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properties: {
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allow: {
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type: "array",
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items: {
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enum: BITWISE_OPERATORS
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},
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uniqueItems: true
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},
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int32Hint: {
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type: "boolean",
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default: false
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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unexpected: "Unexpected use of '{{operator}}'."
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}
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},
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create(context) {
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const options = context.options[0] || {};
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const allowed = options.allow || [];
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const int32Hint = options.int32Hint === true;
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/**
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* Reports an unexpected use of a bitwise operator.
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* @param {ASTNode} node Node which contains the bitwise operator.
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* @returns {void}
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*/
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function report(node) {
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context.report({ node, messageId: "unexpected", data: { operator: node.operator } });
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}
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/**
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* Checks if the given node has a bitwise operator.
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* @param {ASTNode} node The node to check.
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* @returns {boolean} Whether or not the node has a bitwise operator.
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*/
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function hasBitwiseOperator(node) {
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return BITWISE_OPERATORS.indexOf(node.operator) !== -1;
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}
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/**
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* Checks if exceptions were provided, e.g. `{ allow: ['~', '|'] }`.
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* @param {ASTNode} node The node to check.
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* @returns {boolean} Whether or not the node has a bitwise operator.
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*/
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function allowedOperator(node) {
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return allowed.indexOf(node.operator) !== -1;
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}
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/**
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* Checks if the given bitwise operator is used for integer typecasting, i.e. "|0"
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* @param {ASTNode} node The node to check.
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* @returns {boolean} whether the node is used in integer typecasting.
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*/
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function isInt32Hint(node) {
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return int32Hint && node.operator === "|" && node.right &&
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node.right.type === "Literal" && node.right.value === 0;
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}
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/**
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* Report if the given node contains a bitwise operator.
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* @param {ASTNode} node The node to check.
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* @returns {void}
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*/
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function checkNodeForBitwiseOperator(node) {
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if (hasBitwiseOperator(node) && !allowedOperator(node) && !isInt32Hint(node)) {
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report(node);
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}
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}
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return {
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AssignmentExpression: checkNodeForBitwiseOperator,
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BinaryExpression: checkNodeForBitwiseOperator,
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UnaryExpression: checkNodeForBitwiseOperator
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};
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}
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};
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