Class SchemaValidator

packages/language/src/validators/schema-validator.ts:10–58

 * Validates toplevel schema.
 */
export default class SchemaValidator implements AstValidator<Model> {
    constructor(protected readonly documents: LangiumDocuments) {}

    validate(model: Model, accept: ValidationAcceptor) {
        this.validateImports(model, accept);
        validateDuplicatedDeclarations(model, model.declarations, accept);

        const importedModels = resolveTransitiveImports(this.documents, model);

        const importedNames = new Set(importedModels.flatMap((m) => m.declarations.map((d) => d.name)));

        for (const declaration of model.declarations) {
            if (importedNames.has(declaration.name)) {
                accept('error', `A ${declaration.name} already exists in an imported module`, {
                    node: declaration,
                    property: 'name',
                });
            }
        }

        if (
            !model.$document?.uri.path.endsWith(STD_LIB_MODULE_NAME) &&
            !model.$document?.uri.path.endsWith(PLUGIN_MODULE_NAME)
        ) {
            this.validateDataSources(model, accept);
        }
    }

    private async validateDataSources(model: Model, accept: ValidationAcceptor) {
        const dataSources = (await getAllDeclarationsIncludingImports(this.documents, model)).filter((d) =>
            isDataSource(d),
        );
        if (dataSources.length > 1) {
            accept('error', 'Multiple datasource declarations are not allowed', { node: dataSources[1]! });
        }
    }

    private validateImports(model: Model, accept: ValidationAcceptor) {
        model.imports.forEach((imp) => {
            const importedModel = resolveImport(this.documents, imp);
            if (!importedModel) {
                const importPath = imp.path.endsWith('.zmodel') ? imp.path : `${imp.path}.zmodel`;
                accept('error', `Cannot find model file ${importPath}`, {
                    node: imp,
                });
            }
        });
    }
}