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/**
* @fileoverview Rule to flag non-matching identifiers
* @author Matthieu Larcher
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "require identifiers to match a specified regular expression",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/id-match"
},
schema: [
{
type: "string"
},
{
type: "object",
properties: {
properties: {
type: "boolean",
default: false
},
onlyDeclarations: {
type: "boolean",
default: false
},
ignoreDestructuring: {
type: "boolean",
default: false
}
}
}
],
messages: {
notMatch: "Identifier '{{name}}' does not match the pattern '{{pattern}}'."
}
},
create(context) {
//--------------------------------------------------------------------------
// Options
//--------------------------------------------------------------------------
const pattern = context.options[0] || "^.+$",
regexp = new RegExp(pattern); // eslint-disable-line require-unicode-regexp
const options = context.options[1] || {},
properties = !!options.properties,
onlyDeclarations = !!options.onlyDeclarations,
ignoreDestructuring = !!options.ignoreDestructuring;
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
// contains reported nodes to avoid reporting twice on destructuring with shorthand notation
const reported = new Map();
const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
const DECLARATION_TYPES = new Set(["FunctionDeclaration", "VariableDeclarator"]);
const IMPORT_TYPES = new Set(["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"]);
/**
* Checks if a string matches the provided pattern
* @param {string} name The string to check.
* @returns {boolean} if the string is a match
* @private
*/
function isInvalid(name) {
return !regexp.test(name);
}
/**
* Checks if a parent of a node is an ObjectPattern.
* @param {ASTNode} node The node to check.
* @returns {boolean} if the node is inside an ObjectPattern
* @private
*/
function isInsideObjectPattern(node) {
let { parent } = node;
while (parent) {
if (parent.type === "ObjectPattern") {
return true;
}
parent = parent.parent;
}
return false;
}
/**
* Verifies if we should report an error or not based on the effective
* parent node and the identifier name.
* @param {ASTNode} effectiveParent The effective parent node of the node to be reported
* @param {string} name The identifier name of the identifier node
* @returns {boolean} whether an error should be reported or not
*/
function shouldReport(effectiveParent, name) {
return (!onlyDeclarations || DECLARATION_TYPES.has(effectiveParent.type)) &&
!ALLOWED_PARENT_TYPES.has(effectiveParent.type) && isInvalid(name);
}
/**
* Reports an AST node as a rule violation.
* @param {ASTNode} node The node to report.
* @returns {void}
* @private
*/
function report(node) {
if (!reported.has(node)) {
context.report({
node,
messageId: "notMatch",
data: {
name: node.name,
pattern
}
});
reported.set(node, true);
}
}
return {
Identifier(node) {
const name = node.name,
parent = node.parent,
effectiveParent = (parent.type === "MemberExpression") ? parent.parent : parent;
if (parent.type === "MemberExpression") {
if (!properties) {
return;
}
// Always check object names
if (parent.object.type === "Identifier" &&
parent.object.name === name) {
if (isInvalid(name)) {
report(node);
}
// Report AssignmentExpressions left side's assigned variable id
} else if (effectiveParent.type === "AssignmentExpression" &&
effectiveParent.left.type === "MemberExpression" &&
effectiveParent.left.property.name === node.name) {
if (isInvalid(name)) {
report(node);
}
// Report AssignmentExpressions only if they are the left side of the assignment
} else if (effectiveParent.type === "AssignmentExpression" && effectiveParent.right.type !== "MemberExpression") {
if (isInvalid(name)) {
report(node);
}
}
/*
* Properties have their own rules, and
* AssignmentPattern nodes can be treated like Properties:
* e.g.: const { no_camelcased = false } = bar;
*/
} else if (parent.type === "Property" || parent.type === "AssignmentPattern") {
if (parent.parent && parent.parent.type === "ObjectPattern") {
if (parent.shorthand && parent.value.left && isInvalid(name)) {
report(node);
}
const assignmentKeyEqualsValue = parent.key.name === parent.value.name;
// prevent checking righthand side of destructured object
if (!assignmentKeyEqualsValue && parent.key === node) {
return;
}
const valueIsInvalid = parent.value.name && isInvalid(name);
// ignore destructuring if the option is set, unless a new identifier is created
if (valueIsInvalid && !(assignmentKeyEqualsValue && ignoreDestructuring)) {
report(node);
}
}
// never check properties or always ignore destructuring
if (!properties || (ignoreDestructuring && isInsideObjectPattern(node))) {
return;
}
// don't check right hand side of AssignmentExpression to prevent duplicate warnings
if (parent.right !== node && shouldReport(effectiveParent, name)) {
report(node);
}
// Check if it's an import specifier
} else if (IMPORT_TYPES.has(parent.type)) {
// Report only if the local imported identifier is invalid
if (parent.local && parent.local.name === node.name && isInvalid(name)) {
report(node);
}
// Report anything that is invalid that isn't a CallExpression
} else if (shouldReport(effectiveParent, name)) {
report(node);
}
}
};
}
};