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157 lines (130 loc) · 6 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using com.github.javaparser;
using com.github.javaparser.ast.expr;
using com.github.javaparser.ast.stmt;
using com.github.javaparser.ast.type;
using JavaToCSharp.Expressions;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace JavaToCSharp.Statements;
public class TryStatementVisitor : StatementVisitor<TryStmt>
{
public override StatementSyntax Visit(ConversionContext context, TryStmt tryStmt)
{
var resources = tryStmt.getResources().ToList<Expression>() ?? new List<Expression>();
var tryBlock = tryStmt.getTryBlock();
var tryStatements = tryBlock.getStatements().ToList<Statement>();
var tryConverted = VisitStatements(context, tryStatements);
var tryBlockStatements = tryConverted.ToArray();
if (resources.Count == 0)
{
// regular try statement
return TransformTryBlock(context, tryStmt, tryBlockStatements);
}
// try-with-resources statement
// for inner-most using block, use the statements from the Java try block
StatementSyntax result = SyntaxFactory.Block(tryBlockStatements);
// go inner-most to outer-most
resources.Reverse();
foreach (var resource in resources)
{
if (resource.isNameExpr())
{
result = SyntaxFactory.UsingStatement(result)
.WithExpression(
SyntaxFactory.IdentifierName(resource.asNameExpr().getNameAsString()));
}
else if (resource.isVariableDeclarationExpr())
{
var varDecl = resource.asVariableDeclarationExpr();
if (varDecl.getVariables().size() > 1)
{
context.Options.Warning("Unexpected multiple variables in try-with-resources declaration",
resource.getBegin().FromRequiredOptional<Position>().line);
}
var variable = varDecl.getVariable(0);
var variableInit = variable.getInitializer().FromRequiredOptional<Expression>();
var initSyntax = ExpressionVisitor.VisitExpression(context, variableInit)
?? throw new InvalidOperationException("Unable to parse try-with-resources variable initializer");
result = SyntaxFactory.UsingStatement(result)
.WithDeclaration(
SyntaxFactory.VariableDeclaration(
SyntaxFactory.ParseTypeName(TypeHelper.ConvertType(variable.getType())),
SyntaxFactory.SeparatedList(new[]
{
SyntaxFactory.VariableDeclarator(variable.getNameAsString())
.WithInitializer(SyntaxFactory.EqualsValueClause(initSyntax))
})
));
}
else
{
context.Options.Warning("Unexpected try-with-resources resource",
resource.getBegin().FromRequiredOptional<Position>().line);
}
}
if (tryStmt.getFinallyBlock().isPresent() || tryStmt.getCatchClauses().ToList<CatchClause>()?.Count > 0)
{
result = TransformTryBlock(context, tryStmt, new[] { result });
}
return result;
}
private static StatementSyntax TransformTryBlock(ConversionContext context, TryStmt tryStmt,
IEnumerable<StatementSyntax> tryBlockStatements)
{
var catches = tryStmt.getCatchClauses().ToList<CatchClause>();
var trySyn = SyntaxFactory.TryStatement()
.AddBlockStatements(tryBlockStatements.ToArray());
if (catches != null)
{
foreach (var catchClause in catches)
{
var paramType = catchClause.getParameter().getType();
if (paramType is UnionType)
{
var nodes = paramType.getChildNodes()?.ToList<ReferenceType>() ?? new List<ReferenceType>();
foreach (var node in nodes)
{
var referenceTypeName = node.getElementType().ToString();
trySyn = AddCatches(context, catchClause, referenceTypeName, trySyn);
}
}
else
{
var referenceType = (ReferenceType)catchClause.getParameter().getType();
trySyn = AddCatches(context, catchClause, referenceType.getElementType().ToString(), trySyn);
}
}
}
var finallyBlock = tryStmt.getFinallyBlock().FromOptional<BlockStmt>();
if (finallyBlock == null)
return trySyn;
var finallyStatements = finallyBlock.getStatements().ToList<Statement>();
var finallyConverted = VisitStatements(context, finallyStatements);
var finallyBlockSyntax = SyntaxFactory.Block(finallyConverted);
trySyn = trySyn.WithFinally(SyntaxFactory.FinallyClause(finallyBlockSyntax));
return trySyn;
}
private static TryStatementSyntax AddCatches(ConversionContext context, CatchClause ctch,
string typeName, TryStatementSyntax trySyn)
{
var block = ctch.getBody();
var catchStatements = block.getStatements().ToList<Statement>();
var catchConverted = VisitStatements(context, catchStatements);
var catchBlockSyntax = SyntaxFactory.Block(catchConverted);
var type = TypeHelper.ConvertType(typeName);
trySyn = trySyn.AddCatches(
SyntaxFactory.CatchClause(
SyntaxFactory.CatchDeclaration(
SyntaxFactory.ParseTypeName(type),
SyntaxFactory.ParseToken(ctch.getParameter().getNameAsString())
),
filter: null,
block: catchBlockSyntax
)
);
return trySyn;
}
}