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259 lines
11 KiB
Dart
259 lines
11 KiB
Dart
//
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// Copyright 2021 Sergey Penkovsky (sergey.penkovsky@gmail.com)
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import 'package:analyzer/dart/element/element.dart';
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import 'package:source_gen/source_gen.dart';
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import 'bind_parameters_spec.dart';
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import 'metadata_utils.dart';
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enum BindingType {
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instance,
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provide;
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}
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/// ---------------------------------------------------------------------------
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/// BindSpec -- describes a binding specification generated for a dependency.
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///
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/// ENGLISH
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/// Represents all the data necessary to generate a DI binding for a single
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/// method in a module class. Each BindSpec corresponds to one public method
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/// and contains information about its type, provider method, lifecycle (singleton),
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/// parameters (with their annotations), binding strategy (instance/provide),
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/// asynchronous mode, and named keys. It is responsible for generating the
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/// correct Dart code to register this binding with the DI container, in both
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/// sync and async cases, with and without named or runtime arguments.
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///
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/// RUSSIAN
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/// Описывает параметры для создания одного биндинга зависимости (binding spec).
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/// Каждый биндинг соответствует одному публичному методу класса-модуля и
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/// содержит всю информацию для генерации кода регистрации этого биндинга в
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/// DI-контейнере: тип возвращаемой зависимости, имя метода, параметры, аннотации
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/// (@singleton, @named, @instance, @provide), асинхронность, признак runtime
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/// аргументов и др. Генерирует правильный Dart-код для регистрации биндера.
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/// ---------------------------------------------------------------------------
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class BindSpec {
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/// The type this binding provides (e.g. SomeService)
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/// Тип, который предоставляет биндинг (например, SomeService)
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final String returnType;
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/// Method name that implements the binding
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/// Имя метода, который реализует биндинг
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final String methodName;
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/// Optional name for named dependency (from @named)
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/// Необязательное имя, для именованной зависимости (используется с @named)
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final String? named;
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/// Whether the dependency is a singleton (@singleton annotation)
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/// Является ли зависимость синглтоном (имеется ли аннотация @singleton)
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final bool isSingleton;
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/// List of method parameters to inject dependencies with
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/// Список параметров, которые требуются методу для внедрения зависимостей
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final List<BindParameterSpec> parameters;
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/// Binding type: 'instance' or 'provide' (@instance or @provide)
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final BindingType bindingType; // 'instance' | 'provide'
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/// True if the method is asynchronous and uses instance binding (Future)
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final bool isAsyncInstance;
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/// True if the method is asynchronous and uses provide binding (Future)
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final bool isAsyncProvide;
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/// True if the binding method accepts runtime "params" argument (@params)
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final bool hasParams;
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BindSpec({
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required this.returnType,
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required this.methodName,
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required this.isSingleton,
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required this.parameters,
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this.named,
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required this.bindingType,
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required this.isAsyncInstance,
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required this.isAsyncProvide,
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required this.hasParams,
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});
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/// -------------------------------------------------------------------------
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/// generateBind
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///
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/// ENGLISH
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/// Generates a line of Dart code registering the binding with the DI framework.
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/// Produces something like:
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/// bind<Type>().toProvide(() => method(args)).withName('name').singleton();
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/// Indent parameter allows formatted multiline output.
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///
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/// RUSSIAN
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/// Формирует dart-код для биндинга, например:
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/// bind<Type>().toProvide(() => method(args)).withName('name').singleton();
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/// Параметр [indent] задаёт отступ для красивого форматирования кода.
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/// -------------------------------------------------------------------------
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String generateBind(int indent) {
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final indentStr = ' ' * indent;
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final provide = _generateProvideClause(indent);
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final postfix = _generatePostfix();
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return '$indentStr'
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'bind<$returnType>()'
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'$provide'
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'$postfix;';
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}
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// Internal method: decides how the provide clause should be generated by param kind.
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String _generateProvideClause(int indent) {
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if (hasParams) return _generateWithParamsProvideClause(indent);
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return _generatePlainProvideClause(indent);
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}
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/// EN / RU: Supports runtime parameters (@params).
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String _generateWithParamsProvideClause(int indent) {
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// Safe variable name for parameters.
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const paramVar = 'args';
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final fnArgs = parameters.map((p) => p.generateArg(paramVar)).join(', ');
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final multiLine = fnArgs.length > 60 || fnArgs.contains('\n');
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switch (bindingType) {
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case BindingType.instance:
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throw StateError(
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'Internal error: _generateWithParamsProvideClause called for @instance binding with @params.');
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//return isAsyncInstance
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// ? '.toInstanceAsync(($fnArgs) => $methodName($fnArgs))'
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// : '.toInstance(($fnArgs) => $methodName($fnArgs))';
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case BindingType.provide:
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if (isAsyncProvide) {
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return multiLine
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? '.toProvideAsyncWithParams(\n${' ' * (indent + 2)}($paramVar) => $methodName($fnArgs))'
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: '.toProvideAsyncWithParams(($paramVar) => $methodName($fnArgs))';
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} else {
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return multiLine
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? '.toProvideWithParams(\n${' ' * (indent + 2)}($paramVar) => $methodName($fnArgs))'
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: '.toProvideWithParams(($paramVar) => $methodName($fnArgs))';
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}
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}
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}
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/// EN / RU: Supports only injected dependencies, not runtime (@params).
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String _generatePlainProvideClause(int indent) {
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final argsStr = parameters.map((p) => p.generateArg()).join(', ');
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final multiLine = argsStr.length > 60 || argsStr.contains('\n');
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switch (bindingType) {
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case BindingType.instance:
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return isAsyncInstance
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? '.toInstanceAsync($methodName($argsStr))'
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: '.toInstance($methodName($argsStr))';
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case BindingType.provide:
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if (isAsyncProvide) {
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return multiLine
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? '.toProvideAsync(\n${' ' * (indent + 2)}() => $methodName($argsStr))'
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: '.toProvideAsync(() => $methodName($argsStr))';
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} else {
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return multiLine
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? '.toProvide(\n${' ' * (indent + 2)}() => $methodName($argsStr))'
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: '.toProvide(() => $methodName($argsStr))';
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}
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}
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}
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/// EN / RU: Adds .withName and .singleton if needed.
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String _generatePostfix() {
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final namePart = named != null ? ".withName('$named')" : '';
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final singletonPart = isSingleton ? '.singleton()' : '';
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return '$namePart$singletonPart';
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}
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/// -------------------------------------------------------------------------
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/// fromMethod
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///
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/// ENGLISH
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/// Creates a BindSpec from a module class method by analyzing its return type,
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/// annotations, list of parameters (with their own annotations), and async-ness.
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/// Throws if a method does not have the required @instance() or @provide().
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///
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/// RUSSIAN
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/// Создаёт спецификацию биндинга (BindSpec) из метода класса-модуля, анализируя
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/// возвращаемый тип, аннотации, параметры (и их аннотации), а также факт
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/// асинхронности. Если нет @instance или @provide — кидает ошибку.
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/// -------------------------------------------------------------------------
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static BindSpec fromMethod(MethodElement method) {
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var returnType = method.returnType.getDisplayString();
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final methodName = method.displayName;
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// Check for @singleton annotation.
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final isSingleton = MetadataUtils.anyMeta(method.metadata, 'singleton');
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// Get @named value if present.
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final named = MetadataUtils.getNamedValue(method.metadata);
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// Parse each method parameter.
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final params = <BindParameterSpec>[];
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bool hasParams = false;
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for (final p in method.parameters) {
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final typeStr = p.type.getDisplayString();
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final paramNamed = MetadataUtils.getNamedValue(p.metadata);
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final isParams = MetadataUtils.anyMeta(p.metadata, 'params');
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if (isParams) hasParams = true;
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params.add(BindParameterSpec(typeStr, paramNamed, isParams: isParams));
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}
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// Determine bindingType: @instance or @provide.
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final hasInstance = MetadataUtils.anyMeta(method.metadata, 'instance');
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final hasProvide = MetadataUtils.anyMeta(method.metadata, 'provide');
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if (!hasInstance && !hasProvide) {
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throw InvalidGenerationSourceError(
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'Method $methodName must be marked with @instance() or @provide().',
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element: method,
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);
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}
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final bindingType =
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hasInstance ? BindingType.instance : BindingType.provide;
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// PROHIBIT @params with @instance bindings!
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if (bindingType == BindingType.instance && hasParams) {
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throw InvalidGenerationSourceError(
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'@params() (runtime arguments) cannot be used together with @instance() on method $methodName. '
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'Use @provide() instead if you want runtime arguments.',
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element: method,
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);
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}
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// -- Extract inner type for Future<T> and set async flags.
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bool isAsyncInstance = false;
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bool isAsyncProvide = false;
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final futureInnerType = _extractFutureInnerType(returnType);
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if (futureInnerType != null) {
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returnType = futureInnerType;
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if (bindingType == BindingType.instance) isAsyncInstance = true;
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if (bindingType == BindingType.provide) isAsyncProvide = true;
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}
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return BindSpec(
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returnType: returnType,
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methodName: methodName,
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isSingleton: isSingleton,
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named: named,
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parameters: params,
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bindingType: bindingType,
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isAsyncInstance: isAsyncInstance,
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isAsyncProvide: isAsyncProvide,
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hasParams: hasParams,
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);
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}
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/// EN / RU: Extracts inner type from Future<T>, returns e.g. "T" or null.
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static String? _extractFutureInnerType(String typeName) {
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final match = RegExp(r'^Future<(.+)>$').firstMatch(typeName);
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return match?.group(1)?.trim();
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}
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}
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