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remove timer and simon
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+154
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/**
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* @fileoverview Rule to flag non-camelcased 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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// 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: "enforce camelcase naming convention",
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category: "Stylistic Issues",
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recommended: false
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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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properties: {
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enum: ["always", "never"]
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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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},
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create(context) {
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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// contains reported nodes to avoid reporting twice on destructuring with shorthand notation
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const reported = [];
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const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
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/**
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* Checks if a string contains an underscore and isn't all upper-case
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* @param {string} name The string to check.
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* @returns {boolean} if the string is underscored
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* @private
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*/
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function isUnderscored(name) {
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// if there's an underscore, it might be A_CONSTANT, which is okay
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return name.indexOf("_") > -1 && name !== name.toUpperCase();
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}
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/**
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* Reports an AST node as a rule violation.
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* @param {ASTNode} node The node to report.
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* @returns {void}
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* @private
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*/
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function report(node) {
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if (reported.indexOf(node) < 0) {
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reported.push(node);
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context.report({ node, message: "Identifier '{{name}}' is not in camel case.", data: { name: node.name } });
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}
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}
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const options = context.options[0] || {};
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let properties = options.properties || "";
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if (properties !== "always" && properties !== "never") {
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properties = "always";
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}
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return {
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Identifier(node) {
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/*
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* Leading and trailing underscores are commonly used to flag
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* private/protected identifiers, strip them
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*/
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const name = node.name.replace(/^_+|_+$/g, ""),
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effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
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// MemberExpressions get special rules
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if (node.parent.type === "MemberExpression") {
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// "never" check properties
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if (properties === "never") {
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return;
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}
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// Always report underscored object names
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if (node.parent.object.type === "Identifier" && node.parent.object.name === node.name && isUnderscored(name)) {
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report(node);
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// Report AssignmentExpressions only if they are the left side of the assignment
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} else if (effectiveParent.type === "AssignmentExpression" && isUnderscored(name) && (effectiveParent.right.type !== "MemberExpression" || effectiveParent.left.type === "MemberExpression" && effectiveParent.left.property.name === node.name)) {
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report(node);
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}
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/*
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* Properties have their own rules, and
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* AssignmentPattern nodes can be treated like Properties:
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* e.g.: const { no_camelcased = false } = bar;
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*/
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} else if (node.parent.type === "Property" || node.parent.type === "AssignmentPattern") {
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if (node.parent.parent && node.parent.parent.type === "ObjectPattern") {
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if (node.parent.shorthand && node.parent.value.left && isUnderscored(name)) {
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report(node);
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}
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// prevent checking righthand side of destructured object
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if (node.parent.key === node && node.parent.value !== node) {
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return;
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}
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if (node.parent.value.name && isUnderscored(name)) {
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report(node);
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}
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}
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// "never" check properties
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if (properties === "never") {
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return;
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}
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// don't check right hand side of AssignmentExpression to prevent duplicate warnings
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if (isUnderscored(name) && !ALLOWED_PARENT_TYPES.has(effectiveParent.type) && !(node.parent.right === node)) {
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report(node);
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}
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// Check if it's an import specifier
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} else if (["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"].indexOf(node.parent.type) >= 0) {
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// Report only if the local imported identifier is underscored
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if (node.parent.local && node.parent.local.name === node.name && isUnderscored(name)) {
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report(node);
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}
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// Report anything that is underscored that isn't a CallExpression
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} else if (isUnderscored(name) && !ALLOWED_PARENT_TYPES.has(effectiveParent.type)) {
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report(node);
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}
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}
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};
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}
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};
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