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visitor.dart
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visitor.dart
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part of 'prefer_trailing_comma_rule.dart';
class _Visitor extends RecursiveAstVisitor<void> {
final LineInfo _lineInfo;
final int? _breakpoint;
final _nodes = <AstNode>[];
Iterable<AstNode> get nodes => _nodes;
_Visitor(this._lineInfo, this._breakpoint);
@override
void visitArgumentList(ArgumentList node) {
super.visitArgumentList(node);
_visitNodeList(node.arguments, node.leftParenthesis, node.rightParenthesis);
}
@override
void visitFormalParameterList(FormalParameterList node) {
super.visitFormalParameterList(node);
_visitNodeList(
node.parameters,
node.leftParenthesis,
node.rightParenthesis,
);
}
@override
void visitListLiteral(ListLiteral node) {
super.visitListLiteral(node);
_visitNodeList(node.elements, node.leftBracket, node.rightBracket);
}
@override
void visitSetOrMapLiteral(SetOrMapLiteral node) {
super.visitSetOrMapLiteral(node);
_visitNodeList(node.elements, node.leftBracket, node.rightBracket);
}
void _visitNodeList(
Iterable<AstNode> nodes,
Token leftBracket,
Token rightBracket,
) {
if (nodes.isEmpty) {
return;
}
final last = nodes.last;
if (last.endToken.next?.type != TokenType.COMMA &&
(!_isLastItemMultiLine(last, leftBracket, rightBracket) &&
_getLineNumber(leftBracket) != _getLineNumber(rightBracket) ||
_breakpoint != null && nodes.length >= _breakpoint!)) {
_nodes.add(last);
}
}
bool _isLastItemMultiLine(
AstNode node,
Token leftBracket,
Token rightBracket,
) =>
_getLineNumber(leftBracket) ==
_lineInfo.getLocation(node.offset).lineNumber &&
_getLineNumber(rightBracket) ==
_lineInfo.getLocation(node.end).lineNumber;
int _getLineNumber(SyntacticEntity entity) =>
_lineInfo.getLocation(entity.offset).lineNumber;
}