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import { injectable, } from 'inversify';
import * as eslintScope from 'eslint-scope';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { IScopeAnalyzer } from '../../interfaces/analyzers/scope-analyzer/IScopeAnalyzer';
import { ecmaVersion } from '../../constants/EcmaVersion';
import { NodeGuards } from '../../node/NodeGuards';
@injectable()
export class ScopeAnalyzer implements IScopeAnalyzer {
/**
* @type {eslintScope.AnalysisOptions}
*/
private static readonly eslintScopeOptions: eslintScope.AnalysisOptions = {
ecmaVersion,
optimistic: true
};
/**
* @type {acorn.Options['sourceType'][]}
*/
private static readonly sourceTypes: acorn.Options['sourceType'][] = [
'script',
'module'
];
/**
* @type {number}
*/
private static readonly emptyRangeValue: number = 0;
/**
* @type {eslintScope.ScopeManager | null}
*/
private scopeManager: eslintScope.ScopeManager | null = null;
/**
* `eslint-scope` reads `ranges` property of a nodes
* Should attach that property to the some custom nodes
*
* @param {Node} astTree
*/
private static attachMissingRanges (astTree: ESTree.Node): void {
estraverse.replace(astTree, {
enter: (node: ESTree.Node, parentNode: ESTree.Node | null): ESTree.Node => {
if (!node.range) {
node.range = [
parentNode?.range?.[0] ?? ScopeAnalyzer.emptyRangeValue,
parentNode?.range?.[1] ?? ScopeAnalyzer.emptyRangeValue
];
}
return node;
}
});
}
/**
* @param {Node} node
* @returns {boolean}
*/
private static isRootNode (node: ESTree.Node): boolean {
return NodeGuards.isProgramNode(node) || node.parentNode === node;
}
/**
* @param {Program} astTree
*/
public analyze (astTree: ESTree.Node): void {
const sourceTypeLength: number = ScopeAnalyzer.sourceTypes.length;
ScopeAnalyzer.attachMissingRanges(astTree);
for (let i: number = 0; i < sourceTypeLength; i++) {
try {
this.scopeManager = eslintScope.analyze(astTree, {
...ScopeAnalyzer.eslintScopeOptions,
sourceType: ScopeAnalyzer.sourceTypes[i]
});
return;
} catch (error) {
if (i < sourceTypeLength - 1) {
continue;
}
throw new Error(error);
}
}
throw new Error('Scope analyzing error');
}
/**
* @param {Node} node
* @returns {Scope}
*/
public acquireScope (node: ESTree.Node): eslintScope.Scope {
if (!this.scopeManager) {
throw new Error('Scope manager is not defined');
}
const scope: eslintScope.Scope | null = this.scopeManager.acquire(
node,
ScopeAnalyzer.isRootNode(node)
);
if (!scope) {
throw new Error('Cannot acquire scope for node');
}
this.sanitizeScopes(scope);
return scope;
}
/**
* @param {Scope} scope
*/
private sanitizeScopes (scope: eslintScope.Scope): void {
scope.childScopes.forEach((childScope: eslintScope.Scope) => {
// fix of class scopes
// trying to move class scope references to the parent scope
if (childScope.type === 'class' && childScope.upper) {
if (!childScope.variables.length) {
return;
}
// class name variable is always first
const classNameVariable: eslintScope.Variable = childScope.variables[0];
const upperVariable: eslintScope.Variable | undefined = childScope.upper.variables
.find((variable: eslintScope.Variable) => {
const isValidClassNameVariable: boolean = classNameVariable.defs
.some((definition: eslintScope.Definition) => definition.type === 'ClassName');
return isValidClassNameVariable && variable.name === classNameVariable.name;
});
upperVariable?.references.push(...childScope.variables[0].references);
}
});
for (const childScope of scope.childScopes) {
this.sanitizeScopes(childScope);
}
}
}
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