145 lines
4.5 KiB
JavaScript
145 lines
4.5 KiB
JavaScript
/**
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* @fileoverview Rule to flag non-matching identifiers
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* @author Matthieu Larcher
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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: "require identifiers to match a specified regular expression",
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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: "string"
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},
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{
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type: "object",
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properties: {
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properties: {
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type: "boolean"
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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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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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const pattern = context.options[0] || "^.+$",
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regexp = new RegExp(pattern);
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const options = context.options[1] || {},
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properties = !!options.properties,
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onlyDeclarations = !!options.onlyDeclarations;
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/**
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* Checks if a string matches the provided pattern
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* @param {string} name The string to check.
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* @returns {boolean} if the string is a match
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* @private
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*/
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function isInvalid(name) {
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return !regexp.test(name);
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}
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/**
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* Verifies if we should report an error or not based on the effective
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* parent node and the identifier name.
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* @param {ASTNode} effectiveParent The effective parent node of the node to be reported
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* @param {string} name The identifier name of the identifier node
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* @returns {boolean} whether an error should be reported or not
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*/
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function shouldReport(effectiveParent, name) {
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return effectiveParent.type !== "CallExpression" &&
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effectiveParent.type !== "NewExpression" &&
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isInvalid(name);
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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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context.report({
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node,
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message: "Identifier '{{name}}' does not match the pattern '{{pattern}}'.",
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data: {
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name: node.name,
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pattern
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}
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});
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}
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return {
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Identifier(node) {
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const name = node.name,
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parent = node.parent,
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effectiveParent = (parent.type === "MemberExpression") ? parent.parent : parent;
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if (parent.type === "MemberExpression") {
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if (!properties) {
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return;
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}
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// Always check object names
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if (parent.object.type === "Identifier" &&
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parent.object.name === name) {
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if (isInvalid(name)) {
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report(node);
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}
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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" &&
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(effectiveParent.right.type !== "MemberExpression" ||
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effectiveParent.left.type === "MemberExpression" &&
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effectiveParent.left.property.name === name)) {
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if (isInvalid(name)) {
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report(node);
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}
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}
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} else if (parent.type === "Property") {
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if (!properties || parent.key.name !== name) {
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return;
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}
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if (shouldReport(effectiveParent, name)) {
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report(node);
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}
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} else {
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const isDeclaration = effectiveParent.type === "FunctionDeclaration" || effectiveParent.type === "VariableDeclarator";
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if (onlyDeclarations && !isDeclaration) {
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return;
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}
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if (shouldReport(effectiveParent, name)) {
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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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};
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