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/**
* @fileoverview Rule to flag non-camelcased identifiers
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "enforce camelcase naming convention",
category: "Stylistic Issues",
recommended: false
},
schema: [
{
type: "object",
properties: {
properties: {
enum: ["always", "never"]
}
},
additionalProperties: false
}
]
},
create(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
// contains reported nodes to avoid reporting twice on destructuring with shorthand notation
const reported = [];
const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
/**
* Checks if a string contains an underscore and isn't all upper-case
* @param {string} name The string to check.
* @returns {boolean} if the string is underscored
* @private
*/
function isUnderscored(name) {
// if there's an underscore, it might be A_CONSTANT, which is okay
return name.indexOf("_") > -1 && name !== name.toUpperCase();
}
/**
* Reports an AST node as a rule violation.
* @param {ASTNode} node The node to report.
* @returns {void}
* @private
*/
function report(node) {
if (reported.indexOf(node) < 0) {
reported.push(node);
context.report({ node, message: "Identifier '{{name}}' is not in camel case.", data: { name: node.name } });
}
}
const options = context.options[0] || {};
let properties = options.properties || "";
if (properties !== "always" && properties !== "never") {
properties = "always";
}
return {
Identifier(node) {
/*
* Leading and trailing underscores are commonly used to flag
* private/protected identifiers, strip them
*/
const name = node.name.replace(/^_+|_+$/g, ""),
effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
// MemberExpressions get special rules
if (node.parent.type === "MemberExpression") {
// "never" check properties
if (properties === "never") {
return;
}
// Always report underscored object names
if (node.parent.object.type === "Identifier" &&
node.parent.object.name === node.name &&
isUnderscored(name)) {
report(node);
// Report AssignmentExpressions only if they are the left side of the assignment
} else if (effectiveParent.type === "AssignmentExpression" &&
isUnderscored(name) &&
(effectiveParent.right.type !== "MemberExpression" ||
effectiveParent.left.type === "MemberExpression" &&
effectiveParent.left.property.name === node.name)) {
report(node);
}
// Properties have their own rules
} else if (node.parent.type === "Property") {
// "never" check properties
if (properties === "never") {
return;
}
if (node.parent.parent && node.parent.parent.type === "ObjectPattern" &&
node.parent.key === node && node.parent.value !== node) {
return;
}
if (isUnderscored(name) && !ALLOWED_PARENT_TYPES.has(effectiveParent.type)) {
report(node);
}
// Check if it's an import specifier
} else if (["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"].indexOf(node.parent.type) >= 0) {
// Report only if the local imported identifier is underscored
if (node.parent.local && node.parent.local.name === node.name && isUnderscored(name)) {
report(node);
}
// Report anything that is underscored that isn't a CallExpression
} else if (isUnderscored(name) && !ALLOWED_PARENT_TYPES.has(effectiveParent.type)) {
report(node);
}
}
};
}
};
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