Make eager ast resolving behavior opt-in

docs/content/en/docs/Advanced Features/builder_options.md

@@ -63,6 +63,8 @@ At the moment, moor supports these options:
   However, it's still in development and may not work in all cases yet. Please report any issues you can find.
   __Warning:__ The new type inference algorithm is in development and does not obey to semantic versioning.
   Results and generated code might change in moor versions not declared as breaking.
+* `eagerly_load_dart_ast`: Moor's builder will load the resolved AST whenever it encounters a Dart file,
+  instead of lazily when it reads a table. This is used to investigate rare builder crashes. 
 
 ## Available extensions
 

moor/build.yaml

@@ -9,6 +9,7 @@ targets:
           compact_query_methods: true
           write_from_json_string_constructor: true
           use_experimental_inference: true
+          eagerly_load_dart_ast: true
           sqlite_modules:
             - json1
             - fts5

moor_generator/lib/src/analyzer/options.dart

@@ -63,6 +63,9 @@ class MoorOptions {
   @JsonKey(name: 'sqlite_modules', defaultValue: [])
   final List<SqlModule> modules;
 
+  @JsonKey(name: 'eagerly_load_dart_ast', defaultValue: false)
+  final bool eagerlyLoadDartAst;
+
   /// Whether the [module] has been enabled in this configuration.
   bool hasModule(SqlModule module) => modules.contains(module);
 
@@ -75,6 +78,7 @@ class MoorOptions {
       this.useColumnNameAsJsonKeyWhenDefinedInMoorFile = false,
       this.generateConnectConstructor = false,
       this.useExperimentalInference = false,
+      this.eagerlyLoadDartAst = false,
       this.modules = const []});
 
   factory MoorOptions.fromJson(Map<String, dynamic> json) =>

moor_generator/lib/src/analyzer/options.g.dart

@@ -17,7 +17,8 @@ MoorOptions _$MoorOptionsFromJson(Map<String, dynamic> json) {
       'use_column_name_as_json_key_when_defined_in_moor_file',
       'generate_connect_constructor',
       'use_experimental_inference',
-      'sqlite_modules'
+      'sqlite_modules',
+      'eagerly_load_dart_ast',
     ]);
     final val = MoorOptions(
       generateFromJsonStringConstructor: $checkedConvert(
@@ -46,6 +47,9 @@ MoorOptions _$MoorOptionsFromJson(Map<String, dynamic> json) {
       useExperimentalInference: $checkedConvert(
               json, 'use_experimental_inference', (v) => v as bool) ??
           false,
+      eagerlyLoadDartAst:
+          $checkedConvert(json, 'eagerly_load_dart_ast', (v) => v as bool) ??
+              false,
       modules: $checkedConvert(
               json,
               'sqlite_modules',

moor_generator/lib/src/backends/build/build_backend.dart

@@ -5,10 +5,15 @@ import 'package:analyzer/dart/element/type.dart';
 import 'package:build/build.dart' hide log;
 import 'package:build/build.dart' as build show log;
 import 'package:logging/logging.dart';
+import 'package:moor_generator/src/analyzer/options.dart';
 import 'package:moor_generator/src/backends/backend.dart';
 import 'package:moor_generator/src/backends/build/serialized_types.dart';
 
 class BuildBackend extends Backend {
+  final MoorOptions options;
+
+  BuildBackend([this.options = const MoorOptions()]);
+
   BuildBackendTask createTask(BuildStep step) {
     return BuildBackendTask(step, this);
   }
@@ -47,8 +52,11 @@ class BuildBackendTask extends BackendTask {
     try {
       final asset = _resolve(uri);
       final library = await step.resolver.libraryFor(asset);
-      _cachedResults[asset] =
-          await library.session.getResolvedLibraryByElement(library);
+
+      if (backend.options.eagerlyLoadDartAst) {
+        _cachedResults[asset] =
+            await library.session.getResolvedLibraryByElement(library);
+      }
 
       return library;
     } on NonLibraryAssetException catch (_) {
@@ -63,8 +71,12 @@ class BuildBackendTask extends BackendTask {
     // dart file was read...
     final assetId = await step.resolver.assetIdForElement(element);
     final result = _cachedResults[assetId];
-    return result.getElementDeclaration(element) ??
-        await super.loadElementDeclaration(element);
+
+    if (result != null) {
+      return result.getElementDeclaration(element);
+    } else {
+      return super.loadElementDeclaration(element);
+    }
   }
 
   @override

moor_generator/lib/src/backends/build/moor_builder.dart

@@ -19,7 +19,7 @@ mixin MoorBuilder on Builder {
     Task task;
     FoundFile input;
     try {
-      final backend = BuildBackend();
+      final backend = BuildBackend(options);
       final backendTask = backend.createTask(step);
       final session = MoorSession(backend, options: options);