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604 lines
22 KiB
604 lines
22 KiB
/**
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* @fileoverview Rule to flag declared but unused variables
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const lodash = require("lodash");
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const astUtils = require("../ast-utils");
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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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docs: {
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description: "disallow unused variables",
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category: "Variables",
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recommended: true
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},
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schema: [
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{
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oneOf: [
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{
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enum: ["all", "local"]
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},
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{
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type: "object",
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properties: {
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vars: {
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enum: ["all", "local"]
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},
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varsIgnorePattern: {
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type: "string"
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},
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args: {
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enum: ["all", "after-used", "none"]
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},
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ignoreRestSiblings: {
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type: "boolean"
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},
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argsIgnorePattern: {
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type: "string"
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},
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caughtErrors: {
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enum: ["all", "none"]
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},
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caughtErrorsIgnorePattern: {
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type: "string"
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}
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}
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}
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]
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}
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]
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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const DEFINED_MESSAGE = "'{{name}}' is defined but never used.";
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const ASSIGNED_MESSAGE = "'{{name}}' is assigned a value but never used.";
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const REST_PROPERTY_TYPE = /^(?:Experimental)?RestProperty$/;
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const config = {
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vars: "all",
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args: "after-used",
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ignoreRestSiblings: false,
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caughtErrors: "none"
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};
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const firstOption = context.options[0];
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if (firstOption) {
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if (typeof firstOption === "string") {
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config.vars = firstOption;
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} else {
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config.vars = firstOption.vars || config.vars;
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config.args = firstOption.args || config.args;
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config.ignoreRestSiblings = firstOption.ignoreRestSiblings || config.ignoreRestSiblings;
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config.caughtErrors = firstOption.caughtErrors || config.caughtErrors;
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if (firstOption.varsIgnorePattern) {
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config.varsIgnorePattern = new RegExp(firstOption.varsIgnorePattern);
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}
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if (firstOption.argsIgnorePattern) {
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config.argsIgnorePattern = new RegExp(firstOption.argsIgnorePattern);
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}
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if (firstOption.caughtErrorsIgnorePattern) {
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config.caughtErrorsIgnorePattern = new RegExp(firstOption.caughtErrorsIgnorePattern);
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}
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}
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}
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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const STATEMENT_TYPE = /(?:Statement|Declaration)$/;
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/**
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* Determines if a given variable is being exported from a module.
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* @param {Variable} variable - EScope variable object.
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* @returns {boolean} True if the variable is exported, false if not.
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* @private
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*/
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function isExported(variable) {
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const definition = variable.defs[0];
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if (definition) {
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let node = definition.node;
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if (node.type === "VariableDeclarator") {
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node = node.parent;
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} else if (definition.type === "Parameter") {
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return false;
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}
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return node.parent.type.indexOf("Export") === 0;
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}
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return false;
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}
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/**
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* Determines if a variable has a sibling rest property
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* @param {Variable} variable - EScope variable object.
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* @returns {boolean} True if the variable is exported, false if not.
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* @private
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*/
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function hasRestSpreadSibling(variable) {
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if (config.ignoreRestSiblings) {
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return variable.defs.some(def => {
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const propertyNode = def.name.parent;
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const patternNode = propertyNode.parent;
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return (
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propertyNode.type === "Property" &&
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patternNode.type === "ObjectPattern" &&
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REST_PROPERTY_TYPE.test(patternNode.properties[patternNode.properties.length - 1].type)
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);
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});
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}
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return false;
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}
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/**
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* Determines if a reference is a read operation.
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* @param {Reference} ref - An escope Reference
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* @returns {boolean} whether the given reference represents a read operation
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* @private
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*/
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function isReadRef(ref) {
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return ref.isRead();
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}
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/**
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* Determine if an identifier is referencing an enclosing function name.
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* @param {Reference} ref - The reference to check.
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* @param {ASTNode[]} nodes - The candidate function nodes.
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* @returns {boolean} True if it's a self-reference, false if not.
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* @private
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*/
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function isSelfReference(ref, nodes) {
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let scope = ref.from;
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while (scope) {
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if (nodes.indexOf(scope.block) >= 0) {
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return true;
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}
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scope = scope.upper;
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}
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return false;
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}
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/**
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* Checks the position of given nodes.
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*
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* @param {ASTNode} inner - A node which is expected as inside.
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* @param {ASTNode} outer - A node which is expected as outside.
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* @returns {boolean} `true` if the `inner` node exists in the `outer` node.
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* @private
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*/
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function isInside(inner, outer) {
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return (
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inner.range[0] >= outer.range[0] &&
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inner.range[1] <= outer.range[1]
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);
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}
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/**
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* If a given reference is left-hand side of an assignment, this gets
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* the right-hand side node of the assignment.
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*
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* In the following cases, this returns null.
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*
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* - The reference is not the LHS of an assignment expression.
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* - The reference is inside of a loop.
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* - The reference is inside of a function scope which is different from
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* the declaration.
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*
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* @param {escope.Reference} ref - A reference to check.
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* @param {ASTNode} prevRhsNode - The previous RHS node.
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* @returns {ASTNode|null} The RHS node or null.
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* @private
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*/
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function getRhsNode(ref, prevRhsNode) {
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const id = ref.identifier;
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const parent = id.parent;
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const granpa = parent.parent;
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const refScope = ref.from.variableScope;
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const varScope = ref.resolved.scope.variableScope;
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const canBeUsedLater = refScope !== varScope || astUtils.isInLoop(id);
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/*
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* Inherits the previous node if this reference is in the node.
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* This is for `a = a + a`-like code.
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*/
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if (prevRhsNode && isInside(id, prevRhsNode)) {
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return prevRhsNode;
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}
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if (parent.type === "AssignmentExpression" &&
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granpa.type === "ExpressionStatement" &&
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id === parent.left &&
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!canBeUsedLater
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) {
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return parent.right;
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}
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return null;
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}
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/**
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* Checks whether a given function node is stored to somewhere or not.
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* If the function node is stored, the function can be used later.
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*
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* @param {ASTNode} funcNode - A function node to check.
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* @param {ASTNode} rhsNode - The RHS node of the previous assignment.
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* @returns {boolean} `true` if under the following conditions:
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* - the funcNode is assigned to a variable.
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* - the funcNode is bound as an argument of a function call.
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* - the function is bound to a property and the object satisfies above conditions.
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* @private
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*/
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function isStorableFunction(funcNode, rhsNode) {
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let node = funcNode;
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let parent = funcNode.parent;
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while (parent && isInside(parent, rhsNode)) {
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switch (parent.type) {
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case "SequenceExpression":
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if (parent.expressions[parent.expressions.length - 1] !== node) {
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return false;
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}
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break;
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case "CallExpression":
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case "NewExpression":
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return parent.callee !== node;
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case "AssignmentExpression":
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case "TaggedTemplateExpression":
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case "YieldExpression":
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return true;
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default:
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if (STATEMENT_TYPE.test(parent.type)) {
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/*
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* If it encountered statements, this is a complex pattern.
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* Since analyzeing complex patterns is hard, this returns `true` to avoid false positive.
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*/
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return true;
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}
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}
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node = parent;
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parent = parent.parent;
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}
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return false;
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}
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/**
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* Checks whether a given Identifier node exists inside of a function node which can be used later.
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*
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* "can be used later" means:
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* - the function is assigned to a variable.
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* - the function is bound to a property and the object can be used later.
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* - the function is bound as an argument of a function call.
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*
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* If a reference exists in a function which can be used later, the reference is read when the function is called.
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*
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* @param {ASTNode} id - An Identifier node to check.
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* @param {ASTNode} rhsNode - The RHS node of the previous assignment.
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* @returns {boolean} `true` if the `id` node exists inside of a function node which can be used later.
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* @private
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*/
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function isInsideOfStorableFunction(id, rhsNode) {
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const funcNode = astUtils.getUpperFunction(id);
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return (
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funcNode &&
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isInside(funcNode, rhsNode) &&
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isStorableFunction(funcNode, rhsNode)
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);
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}
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/**
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* Checks whether a given reference is a read to update itself or not.
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*
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* @param {escope.Reference} ref - A reference to check.
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* @param {ASTNode} rhsNode - The RHS node of the previous assignment.
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* @returns {boolean} The reference is a read to update itself.
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* @private
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*/
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function isReadForItself(ref, rhsNode) {
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const id = ref.identifier;
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const parent = id.parent;
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const granpa = parent.parent;
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return ref.isRead() && (
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// self update. e.g. `a += 1`, `a++`
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(
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parent.type === "AssignmentExpression" &&
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granpa.type === "ExpressionStatement" &&
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parent.left === id
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) ||
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(
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parent.type === "UpdateExpression" &&
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granpa.type === "ExpressionStatement"
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) ||
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// in RHS of an assignment for itself. e.g. `a = a + 1`
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(
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rhsNode &&
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isInside(id, rhsNode) &&
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!isInsideOfStorableFunction(id, rhsNode)
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)
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);
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}
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/**
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* Determine if an identifier is used either in for-in loops.
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*
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* @param {Reference} ref - The reference to check.
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* @returns {boolean} whether reference is used in the for-in loops
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* @private
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*/
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function isForInRef(ref) {
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let target = ref.identifier.parent;
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// "for (var ...) { return; }"
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if (target.type === "VariableDeclarator") {
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target = target.parent.parent;
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}
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if (target.type !== "ForInStatement") {
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return false;
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}
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// "for (...) { return; }"
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if (target.body.type === "BlockStatement") {
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target = target.body.body[0];
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// "for (...) return;"
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} else {
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target = target.body;
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}
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// For empty loop body
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if (!target) {
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return false;
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}
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return target.type === "ReturnStatement";
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}
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/**
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* Determines if the variable is used.
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* @param {Variable} variable - The variable to check.
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* @returns {boolean} True if the variable is used
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* @private
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*/
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function isUsedVariable(variable) {
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const functionNodes = variable.defs.filter(def => def.type === "FunctionName").map(def => def.node),
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isFunctionDefinition = functionNodes.length > 0;
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let rhsNode = null;
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return variable.references.some(ref => {
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if (isForInRef(ref)) {
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return true;
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}
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const forItself = isReadForItself(ref, rhsNode);
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rhsNode = getRhsNode(ref, rhsNode);
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return (
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isReadRef(ref) &&
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!forItself &&
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!(isFunctionDefinition && isSelfReference(ref, functionNodes))
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);
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});
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}
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/**
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* Checks whether the given variable is the last parameter in the non-ignored parameters.
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*
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* @param {escope.Variable} variable - The variable to check.
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* @returns {boolean} `true` if the variable is the last.
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*/
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function isLastInNonIgnoredParameters(variable) {
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const def = variable.defs[0];
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// This is the last.
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if (def.index === def.node.params.length - 1) {
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return true;
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}
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// if all parameters preceded by this variable are ignored and unused, this is the last.
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if (config.argsIgnorePattern) {
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const params = context.getDeclaredVariables(def.node);
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const posteriorParams = params.slice(params.indexOf(variable) + 1);
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if (posteriorParams.every(v => v.references.length === 0 && config.argsIgnorePattern.test(v.name))) {
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return true;
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}
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}
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return false;
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}
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/**
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* Gets an array of variables without read references.
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* @param {Scope} scope - an escope Scope object.
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* @param {Variable[]} unusedVars - an array that saving result.
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* @returns {Variable[]} unused variables of the scope and descendant scopes.
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* @private
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*/
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function collectUnusedVariables(scope, unusedVars) {
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const variables = scope.variables;
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const childScopes = scope.childScopes;
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let i, l;
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if (scope.type !== "TDZ" && (scope.type !== "global" || config.vars === "all")) {
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for (i = 0, l = variables.length; i < l; ++i) {
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const variable = variables[i];
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// skip a variable of class itself name in the class scope
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if (scope.type === "class" && scope.block.id === variable.identifiers[0]) {
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continue;
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}
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// skip function expression names and variables marked with markVariableAsUsed()
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if (scope.functionExpressionScope || variable.eslintUsed) {
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continue;
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}
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// skip implicit "arguments" variable
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if (scope.type === "function" && variable.name === "arguments" && variable.identifiers.length === 0) {
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continue;
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}
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// explicit global variables don't have definitions.
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const def = variable.defs[0];
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if (def) {
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const type = def.type;
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// skip catch variables
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if (type === "CatchClause") {
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if (config.caughtErrors === "none") {
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continue;
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}
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// skip ignored parameters
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if (config.caughtErrorsIgnorePattern && config.caughtErrorsIgnorePattern.test(def.name.name)) {
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continue;
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}
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}
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if (type === "Parameter") {
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// skip any setter argument
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if ((def.node.parent.type === "Property" || def.node.parent.type === "MethodDefinition") && def.node.parent.kind === "set") {
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continue;
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}
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// if "args" option is "none", skip any parameter
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if (config.args === "none") {
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continue;
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}
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// skip ignored parameters
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if (config.argsIgnorePattern && config.argsIgnorePattern.test(def.name.name)) {
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continue;
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}
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// if "args" option is "after-used", skip all but the last parameter
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if (config.args === "after-used" && !isLastInNonIgnoredParameters(variable)) {
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continue;
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}
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} else {
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// skip ignored variables
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if (config.varsIgnorePattern && config.varsIgnorePattern.test(def.name.name)) {
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continue;
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}
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}
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}
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if (!isUsedVariable(variable) && !isExported(variable) && !hasRestSpreadSibling(variable)) {
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unusedVars.push(variable);
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}
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}
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}
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for (i = 0, l = childScopes.length; i < l; ++i) {
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collectUnusedVariables(childScopes[i], unusedVars);
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}
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return unusedVars;
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}
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/**
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* Gets the index of a given variable name in a given comment.
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* @param {escope.Variable} variable - A variable to get.
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* @param {ASTNode} comment - A comment node which includes the variable name.
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* @returns {number} The index of the variable name's location.
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* @private
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*/
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function getColumnInComment(variable, comment) {
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const namePattern = new RegExp(`[\\s,]${lodash.escapeRegExp(variable.name)}(?:$|[\\s,:])`, "g");
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|
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// To ignore the first text "global".
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namePattern.lastIndex = comment.value.indexOf("global") + 6;
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|
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// Search a given variable name.
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const match = namePattern.exec(comment.value);
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return match ? match.index + 1 : 0;
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}
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|
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/**
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* Creates the correct location of a given variables.
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* The location is at its name string in a `/*global` comment.
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*
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* @param {escope.Variable} variable - A variable to get its location.
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* @returns {{line: number, column: number}} The location object for the variable.
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* @private
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*/
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function getLocation(variable) {
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const comment = variable.eslintExplicitGlobalComment;
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|
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return sourceCode.getLocFromIndex(comment.range[0] + 2 + getColumnInComment(variable, comment));
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}
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|
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//--------------------------------------------------------------------------
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// Public
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|
//--------------------------------------------------------------------------
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|
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return {
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"Program:exit"(programNode) {
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const unusedVars = collectUnusedVariables(context.getScope(), []);
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for (let i = 0, l = unusedVars.length; i < l; ++i) {
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|
const unusedVar = unusedVars[i];
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|
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if (unusedVar.eslintExplicitGlobal) {
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context.report({
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node: programNode,
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loc: getLocation(unusedVar),
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message: DEFINED_MESSAGE,
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|
data: unusedVar
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});
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|
} else if (unusedVar.defs.length > 0) {
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context.report({
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node: unusedVar.identifiers[0],
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message: unusedVar.references.some(ref => ref.isWrite()) ? ASSIGNED_MESSAGE : DEFINED_MESSAGE,
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|
data: unusedVar
|
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});
|
|
}
|
|
}
|
|
}
|
|
};
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|
|
|
}
|
|
};
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