Some improvements related to generator error recovery

moor_generator/lib/src/analyzer/runner/steps/analyze_dart.dart

@@ -34,7 +34,7 @@ class AnalyzeDartStep extends AnalyzingStep {
           affectedElement: accessor.fromClass,
           message: msg.toString(),
         ));
-      } catch (e) {
+      } on Exception catch (e) {
         // unknown error while sorting
         reportError(ErrorInDartCode(
           severity: Severity.warning,
@@ -43,6 +43,9 @@ class AnalyzeDartStep extends AnalyzingStep {
         ));
       }
 
+      // Just to have something in case the above breaks.
+      availableEntities ??= const [];
+
       final availableQueries = transitiveImports
           .map((f) => f.currentResult)
           .whereType<ParsedMoorFile>()

moor_generator/lib/src/analyzer/sql_queries/lints/linter.dart

@@ -1,3 +1,4 @@
+import 'package:moor_generator/moor_generator.dart' show MoorColumn;
 import 'package:sqlparser/sqlparser.dart';
 
 import '../query_handler.dart';
@@ -119,10 +120,17 @@ class _LintingVisitor extends RecursiveVisitor<void, void> {
     );
 
     // second, check that no required columns are left out
-    final specifiedTable = linter.mapper.tableToMoor(e.table.resolved as Table);
-    final required = specifiedTable.columns
-        .where(specifiedTable.isColumnRequiredForInsert)
-        .toList();
+    final resolved = e.table.resolved;
+    List<MoorColumn> required;
+    if (resolved is Table) {
+      final specifiedTable =
+          linter.mapper.tableToMoor(e.table.resolved as Table);
+      required = specifiedTable.columns
+          .where(specifiedTable.isColumnRequiredForInsert)
+          .toList();
+    } else {
+      required = const [];
+    }
 
     if (required.isNotEmpty && e.source is DefaultValues) {
       linter.lints.add(AnalysisError(

moor_generator/lib/src/model/base_entity.dart

@@ -9,6 +9,9 @@ abstract class MoorSchemaEntity implements HasDeclaration {
   /// For tables, this can be contents of a `REFERENCES` clause. For triggers,
   /// it would be the tables watched.
   ///
+  /// If an entity contains an (invalid) null reference, that should not be
+  /// included in [references].
+  ///
   /// The generator will verify that the graph of entities and [references]
   /// is acyclic and sort them topologically.
   Iterable<MoorSchemaEntity> get references;

moor_generator/lib/src/model/index.dart

@@ -36,5 +36,10 @@ class MoorIndex extends MoorSchemaEntity {
   String get displayName => name;
 
   @override
-  Iterable<MoorSchemaEntity> get references => [table];
+  Iterable<MoorSchemaEntity> get references {
+    if (table == null) {
+      return const Iterable.empty();
+    }
+    return [table];
+  }
 }

sqlparser/lib/src/reader/parser/parser.dart

@@ -356,8 +356,10 @@ class Parser extends ParserBase
       as = _consumeIdentifier('Expected a name of the result class').identifier;
     }
 
-    final colon =
-        _consume(TokenType.colon, 'Expected a colon (:) followed by a query');
+    final colon = _consume(
+        TokenType.colon,
+        'Expected a colon (:) followed by a query. Imports and CREATE '
+        'statements must appear before the first query.');
     final stmt = _crud();
 
     if (stmt == null) {

sqlparser/lib/src/reader/tokenizer/token.dart

@@ -499,7 +499,7 @@ class KeywordToken extends Token {
   IdentifierToken convertToIdentifier() {
     isIdentifier = true;
 
-    return IdentifierToken(false, span, synthetic: false);
+    return IdentifierToken(false, span, synthetic: true);
   }
 }