163 lines
4.0 KiB
JavaScript
163 lines
4.0 KiB
JavaScript
/**
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* @fileoverview Validate JSX maximum depth
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* @author Chris<[email protected]>
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*/
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'use strict';
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const has = require('object.hasown/polyfill')();
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const includes = require('array-includes');
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const variableUtil = require('../util/variable');
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const jsxUtil = require('../util/jsx');
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const docsUrl = require('../util/docsUrl');
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const reportC = require('../util/report');
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// ------------------------------------------------------------------------------
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// Rule Definition
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// ------------------------------------------------------------------------------
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const messages = {
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wrongDepth: 'Expected the depth of nested jsx elements to be <= {{needed}}, but found {{found}}.',
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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 JSX maximum depth',
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category: 'Stylistic Issues',
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recommended: false,
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url: docsUrl('jsx-max-depth'),
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},
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messages,
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schema: [
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{
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type: 'object',
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properties: {
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max: {
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type: 'integer',
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minimum: 0,
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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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const DEFAULT_DEPTH = 2;
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const option = context.options[0] || {};
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const maxDepth = has(option, 'max') ? option.max : DEFAULT_DEPTH;
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function isExpression(node) {
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return node.type === 'JSXExpressionContainer';
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}
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function hasJSX(node) {
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return jsxUtil.isJSX(node) || (isExpression(node) && jsxUtil.isJSX(node.expression));
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}
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function isLeaf(node) {
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const children = node.children;
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return !children || children.length === 0 || !children.some(hasJSX);
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}
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function getDepth(node) {
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let count = 0;
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while (jsxUtil.isJSX(node.parent) || isExpression(node.parent)) {
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node = node.parent;
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if (jsxUtil.isJSX(node)) {
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count += 1;
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}
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}
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return count;
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}
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function report(node, depth) {
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reportC(context, messages.wrongDepth, 'wrongDepth', {
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node,
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data: {
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found: depth,
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needed: maxDepth,
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},
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});
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}
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function findJSXElementOrFragment(variables, name, previousReferences) {
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function find(refs, prevRefs) {
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for (let i = refs.length - 1; i >= 0; i--) {
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if (has(refs[i], 'writeExpr')) {
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const writeExpr = refs[i].writeExpr;
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return (jsxUtil.isJSX(writeExpr)
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&& writeExpr)
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|| ((writeExpr && writeExpr.type === 'Identifier')
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&& findJSXElementOrFragment(variables, writeExpr.name, prevRefs));
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}
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}
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return null;
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}
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const variable = variableUtil.getVariable(variables, name);
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if (variable && variable.references) {
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const containDuplicates = previousReferences.some((ref) => includes(variable.references, ref));
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// Prevent getting stuck in circular references
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if (containDuplicates) {
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return false;
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}
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return find(variable.references, previousReferences.concat(variable.references));
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}
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return false;
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}
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function checkDescendant(baseDepth, children) {
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baseDepth += 1;
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(children || []).filter((node) => hasJSX(node)).forEach((node) => {
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if (baseDepth > maxDepth) {
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report(node, baseDepth);
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} else if (!isLeaf(node)) {
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checkDescendant(baseDepth, node.children);
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}
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});
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}
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function handleJSX(node) {
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if (!isLeaf(node)) {
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return;
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}
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const depth = getDepth(node);
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if (depth > maxDepth) {
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report(node, depth);
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}
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}
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return {
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JSXElement: handleJSX,
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JSXFragment: handleJSX,
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JSXExpressionContainer(node) {
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if (node.expression.type !== 'Identifier') {
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return;
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}
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const variables = variableUtil.variablesInScope(context);
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const element = findJSXElementOrFragment(variables, node.expression.name, []);
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if (element) {
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const baseDepth = getDepth(node);
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checkDescendant(baseDepth, element.children);
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}
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},
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};
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},
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};
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