Examples with IfStatement org.eclipse.jdt.core.dom.IfStatement used on opensource projects

Example 6 with IfStatement

use of org.eclipse.jdt.core.dom.IfStatement in project flux by eclipse.

the class AdvancedQuickAssistProcessor method getSplitAndConditionProposals.

public static boolean getSplitAndConditionProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
    Operator andOperator = InfixExpression.Operator.CONDITIONAL_AND;
    // check that user invokes quick assist on infix expression
    if (!(node instanceof InfixExpression)) {
        return false;
    }
    InfixExpression infixExpression = (InfixExpression) node;
    if (infixExpression.getOperator() != andOperator) {
        return false;
    }
    int offset = isOperatorSelected(infixExpression, context.getSelectionOffset(), context.getSelectionLength());
    if (offset == -1) {
        return false;
    }
    // check that infix expression belongs to IfStatement
    Statement statement = ASTResolving.findParentStatement(node);
    if (!(statement instanceof IfStatement)) {
        return false;
    }
    IfStatement ifStatement = (IfStatement) statement;
    // check that infix expression is part of first level && condition of IfStatement
    InfixExpression topInfixExpression = infixExpression;
    while (topInfixExpression.getParent() instanceof InfixExpression && ((InfixExpression) topInfixExpression.getParent()).getOperator() == andOperator) {
        topInfixExpression = (InfixExpression) topInfixExpression.getParent();
    }
    if (ifStatement.getExpression() != topInfixExpression) {
        return false;
    }
    //
    if (resultingCollections == null) {
        return true;
    }
    AST ast = ifStatement.getAST();
    ASTRewrite rewrite = ASTRewrite.create(ast);
    // prepare left and right conditions
    Expression[] newOperands = { null, null };
    breakInfixOperationAtOperation(rewrite, topInfixExpression, andOperator, offset, true, newOperands);
    Expression leftCondition = newOperands[0];
    Expression rightCondition = newOperands[1];
    // replace conditions in outer IfStatement
    rewrite.set(ifStatement, IfStatement.EXPRESSION_PROPERTY, leftCondition, null);
    // prepare inner IfStatement
    IfStatement innerIf = ast.newIfStatement();
    innerIf.setExpression(rightCondition);
    innerIf.setThenStatement((Statement) rewrite.createMoveTarget(ifStatement.getThenStatement()));
    Block innerBlock = ast.newBlock();
    innerBlock.statements().add(innerIf);
    Statement elseStatement = ifStatement.getElseStatement();
    if (elseStatement != null) {
        innerIf.setElseStatement((Statement) rewrite.createCopyTarget(elseStatement));
    }
    // replace outer thenStatement
    rewrite.replace(ifStatement.getThenStatement(), innerBlock, null);
    // add correction proposal
    String label = CorrectionMessages.AdvancedQuickAssistProcessor_splitAndCondition_description;
    //		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
    ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, IProposalRelevance.SPLIT_AND_CONDITION);
    resultingCollections.add(proposal);
    return true;
}

Example 7 with IfStatement

use of org.eclipse.jdt.core.dom.IfStatement in project flux by eclipse.

the class AdvancedQuickAssistProcessor method getIfReturnIntoIfElseAtEndOfVoidMethodProposals.

private static boolean getIfReturnIntoIfElseAtEndOfVoidMethodProposals(IInvocationContext context, ASTNode covering, Collection<ICommandAccess> resultingCollections) {
    if (!(covering instanceof IfStatement)) {
        return false;
    }
    IfStatement ifStatement = (IfStatement) covering;
    if (ifStatement.getElseStatement() != null) {
        return false;
    }
    // 'then' block should have 'return' as last statement
    Statement thenStatement = ifStatement.getThenStatement();
    if (!(thenStatement instanceof Block)) {
        return false;
    }
    Block thenBlock = (Block) thenStatement;
    List<Statement> thenStatements = thenBlock.statements();
    if (thenStatements.isEmpty() || !(thenStatements.get(thenStatements.size() - 1) instanceof ReturnStatement)) {
        return false;
    }
    // method should return 'void'
    MethodDeclaration coveringMetod = ASTResolving.findParentMethodDeclaration(covering);
    if (coveringMetod == null) {
        return false;
    }
    Type returnType = coveringMetod.getReturnType2();
    if (!isVoid(returnType)) {
        return false;
    }
    //
    List<Statement> statements = coveringMetod.getBody().statements();
    int ifIndex = statements.indexOf(ifStatement);
    if (ifIndex == -1) {
        return false;
    }
    //  we could produce quick assist
    if (resultingCollections == null) {
        return true;
    }
    //
    AST ast = covering.getAST();
    ASTRewrite rewrite = ASTRewrite.create(ast);
    // remove last 'return' in 'then' block
    ListRewrite listRewriter = rewrite.getListRewrite(thenBlock, (ChildListPropertyDescriptor) ifStatement.getLocationInParent());
    listRewriter.remove(thenStatements.get(thenStatements.size() - 1), null);
    // prepare original nodes
    Expression conditionPlaceholder = (Expression) rewrite.createMoveTarget(ifStatement.getExpression());
    Statement thenPlaceholder = (Statement) rewrite.createMoveTarget(ifStatement.getThenStatement());
    // prepare 'else' block
    Block elseBlock = ast.newBlock();
    for (int i = ifIndex + 1; i < statements.size(); i++) {
        Statement statement = statements.get(i);
        elseBlock.statements().add(rewrite.createMoveTarget(statement));
    }
    // prepare new 'if' statement
    IfStatement newIf = ast.newIfStatement();
    newIf.setExpression(conditionPlaceholder);
    newIf.setThenStatement(thenPlaceholder);
    newIf.setElseStatement(elseBlock);
    rewrite.replace(ifStatement, newIf, null);
    // add correction proposal
    String label = CorrectionMessages.AdvancedQuickAssistProcessor_convertToIfElse_description;
    //		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
    ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, IProposalRelevance.CONVERT_TO_IF_ELSE);
    resultingCollections.add(proposal);
    return true;
}

Example 8 with IfStatement

use of org.eclipse.jdt.core.dom.IfStatement in project flux by eclipse.

the class AdvancedQuickAssistProcessor method getCastAndAssignIfStatementProposals.

private static boolean getCastAndAssignIfStatementProposals(IInvocationContext context, ASTNode node, Collection<ICommandAccess> resultingCollections) {
    if (node instanceof IfStatement) {
        node = ((IfStatement) node).getExpression();
    } else if (node instanceof WhileStatement) {
        node = ((WhileStatement) node).getExpression();
    } else if (node instanceof Block) {
        List<Statement> statements = ((Block) node).statements();
        if (statements.size() > 0) {
            if (context.getSelectionOffset() > statements.get(0).getStartPosition()) {
                return false;
            }
        }
        ASTNode parent = node.getParent();
        Expression expression = null;
        if (parent instanceof IfStatement) {
            expression = ((IfStatement) parent).getExpression();
        } else if (parent instanceof WhileStatement) {
            expression = ((WhileStatement) parent).getExpression();
        } else {
            return false;
        }
        if (expression instanceof InstanceofExpression) {
            node = expression;
        } else {
            final ArrayList<InstanceofExpression> nodes = new ArrayList<InstanceofExpression>();
            expression.accept(new ASTVisitor() {

                @Override
                public boolean visit(InstanceofExpression instanceofExpression) {
                    nodes.add(instanceofExpression);
                    return false;
                }
            });
            if (nodes.size() != 1) {
                return false;
            }
            node = nodes.get(0);
        }
    } else {
        while (node != null && !(node instanceof InstanceofExpression) && !(node instanceof Statement)) {
            node = node.getParent();
        }
    }
    if (!(node instanceof InstanceofExpression)) {
        return false;
    }
    InstanceofExpression expression = (InstanceofExpression) node;
    // test that we are the expression of a 'while' or 'if'
    while (node.getParent() instanceof Expression) {
        node = node.getParent();
    }
    StructuralPropertyDescriptor locationInParent = node.getLocationInParent();
    boolean negated = isNegated(expression);
    Statement body = null;
    ASTNode insertionPosition = null;
    if (negated) {
        insertionPosition = node.getParent();
        if (locationInParent == IfStatement.EXPRESSION_PROPERTY) {
            body = ((IfStatement) node.getParent()).getElseStatement();
            if (body != null) {
                negated = false;
            }
        }
        if (body == null && insertionPosition.getParent() instanceof Block) {
            body = (Statement) insertionPosition.getParent();
        }
    } else {
        if (locationInParent == IfStatement.EXPRESSION_PROPERTY) {
            body = ((IfStatement) node.getParent()).getThenStatement();
        } else if (locationInParent == WhileStatement.EXPRESSION_PROPERTY) {
            body = ((WhileStatement) node.getParent()).getBody();
        }
    }
    if (body == null) {
        return false;
    }
    Type originalType = expression.getRightOperand();
    if (originalType.resolveBinding() == null) {
        return false;
    }
    //  we could produce quick assist
    if (resultingCollections == null) {
        return true;
    }
    //$NON-NLS-1$
    final String KEY_NAME = "name";
    //$NON-NLS-1$
    final String KEY_TYPE = "type";
    //
    AST ast = expression.getAST();
    ASTRewrite rewrite = ASTRewrite.create(ast);
    ICompilationUnit cu = context.getCompilationUnit();
    // prepare correction proposal
    String label = CorrectionMessages.AdvancedQuickAssistProcessor_castAndAssign;
    //		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_LOCAL);
    LinkedCorrectionProposal proposal = new LinkedCorrectionProposal(label, cu, rewrite, IProposalRelevance.CAST_AND_ASSIGN);
    // prepare possible variable names
    List<String> excludedNames = Arrays.asList(ASTResolving.getUsedVariableNames(body));
    String[] varNames = suggestLocalVariableNames(cu, originalType.resolveBinding(), excludedNames);
    for (int i = 0; i < varNames.length; i++) {
        proposal.addLinkedPositionProposal(KEY_NAME, varNames[i], null);
    }
    CastExpression castExpression = ast.newCastExpression();
    castExpression.setExpression((Expression) rewrite.createCopyTarget(expression.getLeftOperand()));
    castExpression.setType((Type) ASTNode.copySubtree(ast, originalType));
    // prepare new variable declaration
    VariableDeclarationFragment vdf = ast.newVariableDeclarationFragment();
    vdf.setName(ast.newSimpleName(varNames[0]));
    vdf.setInitializer(castExpression);
    // prepare new variable declaration statement
    VariableDeclarationStatement vds = ast.newVariableDeclarationStatement(vdf);
    vds.setType((Type) ASTNode.copySubtree(ast, originalType));
    // add new variable declaration statement
    if (negated) {
        ListRewrite listRewriter = rewrite.getListRewrite(body, Block.STATEMENTS_PROPERTY);
        listRewriter.insertAfter(vds, insertionPosition, null);
    } else {
        if (body instanceof Block) {
            ListRewrite listRewriter = rewrite.getListRewrite(body, Block.STATEMENTS_PROPERTY);
            listRewriter.insertAt(vds, 0, null);
        } else {
            Block newBlock = ast.newBlock();
            List<Statement> statements = newBlock.statements();
            statements.add(vds);
            statements.add((Statement) rewrite.createMoveTarget(body));
            rewrite.replace(body, newBlock, null);
        }
    }
    // setup linked positions
    proposal.addLinkedPosition(rewrite.track(vdf.getName()), true, KEY_NAME);
    proposal.addLinkedPosition(rewrite.track(vds.getType()), false, KEY_TYPE);
    proposal.addLinkedPosition(rewrite.track(castExpression.getType()), false, KEY_TYPE);
    // set cursor after expression statement
    proposal.setEndPosition(rewrite.track(vds));
    // add correction proposal
    resultingCollections.add(proposal);
    return true;
}

Example 9 with IfStatement

use of org.eclipse.jdt.core.dom.IfStatement in project flux by eclipse.

the class AdvancedQuickAssistProcessor method getInverseIfIntoContinueInLoopsProposals.

private static boolean getInverseIfIntoContinueInLoopsProposals(IInvocationContext context, ASTNode covering, Collection<ICommandAccess> resultingCollections) {
    if (!(covering instanceof IfStatement)) {
        return false;
    }
    IfStatement ifStatement = (IfStatement) covering;
    if (ifStatement.getElseStatement() != null) {
        return false;
    }
    // prepare outer control structure and block that contains 'if' statement
    ASTNode ifParent = ifStatement.getParent();
    Block ifParentBlock = null;
    ASTNode ifParentStructure = ifParent;
    if (ifParentStructure instanceof Block) {
        ifParentBlock = (Block) ifParent;
        ifParentStructure = ifParentStructure.getParent();
    }
    // check that control structure is loop and 'if' statement if last statement
    if (!(ifParentStructure instanceof ForStatement) && !(ifParentStructure instanceof WhileStatement)) {
        return false;
    }
    if (ifParentBlock != null && ifParentBlock.statements().indexOf(ifStatement) != ifParentBlock.statements().size() - 1) {
        return false;
    }
    //  we could produce quick assist
    if (resultingCollections == null) {
        return true;
    }
    //
    AST ast = covering.getAST();
    ASTRewrite rewrite = ASTRewrite.create(ast);
    // create inverted 'if' statement
    Expression inversedExpression = getInversedExpression(rewrite, ifStatement.getExpression());
    IfStatement newIf = ast.newIfStatement();
    newIf.setExpression(inversedExpression);
    newIf.setThenStatement(ast.newContinueStatement());
    //
    if (ifParentBlock == null) {
        // if there is no block, create it
        ifParentBlock = ast.newBlock();
        ifParentBlock.statements().add(newIf);
        for (Iterator<Statement> iter = getUnwrappedStatements(ifStatement.getThenStatement()).iterator(); iter.hasNext(); ) {
            Statement statement = iter.next();
            ifParentBlock.statements().add(rewrite.createMoveTarget(statement));
        }
        // replace 'if' statement as body with new block
        if (ifParentStructure instanceof ForStatement) {
            rewrite.set(ifParentStructure, ForStatement.BODY_PROPERTY, ifParentBlock, null);
        } else if (ifParentStructure instanceof WhileStatement) {
            rewrite.set(ifParentStructure, WhileStatement.BODY_PROPERTY, ifParentBlock, null);
        }
    } else {
        // if there was block, replace
        ListRewrite listRewriter = rewrite.getListRewrite(ifParentBlock, (ChildListPropertyDescriptor) ifStatement.getLocationInParent());
        listRewriter.replace(ifStatement, newIf, null);
        // add statements from 'then' to the end of block
        for (Iterator<Statement> iter = getUnwrappedStatements(ifStatement.getThenStatement()).iterator(); iter.hasNext(); ) {
            Statement statement = iter.next();
            listRewriter.insertLast(rewrite.createMoveTarget(statement), null);
        }
    }
    // add correction proposal
    String label = CorrectionMessages.AdvancedQuickAssistProcessor_inverseIfToContinue_description;
    //		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
    ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, IProposalRelevance.INVERT_IF_TO_CONTINUE);
    resultingCollections.add(proposal);
    return true;
}

Example 10 with IfStatement

use of org.eclipse.jdt.core.dom.IfStatement in project flux by eclipse.

the class AdvancedQuickAssistProcessor method getInverseIfContinueIntoIfThenInLoopsProposals.

private static boolean getInverseIfContinueIntoIfThenInLoopsProposals(IInvocationContext context, ASTNode covering, Collection<ICommandAccess> resultingCollections) {
    if (!(covering instanceof IfStatement)) {
        return false;
    }
    IfStatement ifStatement = (IfStatement) covering;
    if (ifStatement.getElseStatement() != null) {
        return false;
    }
    // check that 'then' is 'continue'
    if (!(ifStatement.getThenStatement() instanceof ContinueStatement)) {
        return false;
    }
    // check that 'if' statement is statement in block that is body of loop
    Block loopBlock = null;
    if (ifStatement.getParent() instanceof Block && ifStatement.getParent().getParent() instanceof ForStatement) {
        loopBlock = (Block) ifStatement.getParent();
    } else if (ifStatement.getParent() instanceof Block && ifStatement.getParent().getParent() instanceof WhileStatement) {
        loopBlock = (Block) ifStatement.getParent();
    } else {
        return false;
    }
    if (resultingCollections == null) {
        return true;
    }
    //
    AST ast = covering.getAST();
    ASTRewrite rewrite = ASTRewrite.create(ast);
    // create inverted 'if' statement
    Expression inversedExpression = getInversedExpression(rewrite, ifStatement.getExpression());
    IfStatement newIf = ast.newIfStatement();
    newIf.setExpression(inversedExpression);
    // prepare 'then' for new 'if'
    Block thenBlock = ast.newBlock();
    int ifIndex = loopBlock.statements().indexOf(ifStatement);
    for (int i = ifIndex + 1; i < loopBlock.statements().size(); i++) {
        Statement statement = (Statement) loopBlock.statements().get(i);
        thenBlock.statements().add(rewrite.createMoveTarget(statement));
    }
    newIf.setThenStatement(thenBlock);
    // replace 'if' statement in loop
    rewrite.replace(ifStatement, newIf, null);
    // add correction proposal
    String label = CorrectionMessages.AdvancedQuickAssistProcessor_inverseIfContinue_description;
    //		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
    ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(), rewrite, IProposalRelevance.INVERSE_IF_CONTINUE);
    resultingCollections.add(proposal);
    return true;
}