forked from dart-code-checker/dart-code-metrics
-
Notifications
You must be signed in to change notification settings - Fork 0
/
visitor.dart
96 lines (73 loc) · 2.77 KB
/
visitor.dart
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
part of 'prefer_extracting_callbacks_rule.dart';
class _Visitor extends SimpleAstVisitor<void> {
final _expressions = <Expression>[];
final InternalResolvedUnitResult _source;
final Iterable<String> _ignoredArguments;
final int? _allowedLineCount;
Iterable<Expression> get expressions => _expressions;
_Visitor(this._source, this._ignoredArguments, this._allowedLineCount);
@override
void visitClassDeclaration(ClassDeclaration node) {
// ignore: deprecated_member_use
final classType = node.extendsClause?.superclass2.type;
if (!isWidgetOrSubclass(classType) && !isWidgetStateOrSubclass(classType)) {
return;
}
final visitor =
_InstanceCreationVisitor(_source, _ignoredArguments, _allowedLineCount);
node.visitChildren(visitor);
_expressions.addAll(visitor.expressions);
}
}
class _InstanceCreationVisitor extends RecursiveAstVisitor<void> {
final _expressions = <Expression>[];
final InternalResolvedUnitResult _source;
final Iterable<String> _ignoredArguments;
final int? _allowedLineCount;
Iterable<Expression> get expressions => _expressions;
_InstanceCreationVisitor(
this._source, this._ignoredArguments, this._allowedLineCount);
@override
void visitInstanceCreationExpression(InstanceCreationExpression node) {
super.visitInstanceCreationExpression(node);
for (final argument in node.argumentList.arguments) {
final expression =
argument is NamedExpression ? argument.expression : argument;
if (_isNotIgnored(argument) &&
expression is FunctionExpression &&
_hasNotEmptyBlockBody(expression) &&
!_isFlutterBuilder(expression) &&
_isLongEnough(expression)) {
_expressions.add(argument);
}
}
}
bool _hasNotEmptyBlockBody(FunctionExpression expression) {
final body = expression.body;
if (body is! BlockFunctionBody) {
return false;
}
return body.block.statements.isNotEmpty;
}
bool _isFlutterBuilder(FunctionExpression expression) {
if (!isWidgetOrSubclass(expression.declaredElement?.returnType)) {
return false;
}
final formalParameters = expression.parameters?.parameters;
return formalParameters == null ||
formalParameters.isNotEmpty &&
isBuildContext(formalParameters.first.declaredElement?.type);
}
bool _isNotIgnored(Expression argument) =>
argument is! NamedExpression ||
!_ignoredArguments.contains(argument.name.label.name);
bool _isLongEnough(Expression expression) {
final allowedLineCount = _allowedLineCount;
if (allowedLineCount == null) {
return true;
}
final visitor = SourceCodeVisitor(_source.lineInfo);
expression.visitChildren(visitor);
return visitor.linesWithCode.length > allowedLineCount;
}
}