Examples with BLangReturn org.wso2.ballerinalang.compiler.tree.statements.BLangReturn used on opensource projects

Example 11 with BLangReturn

use of org.wso2.ballerinalang.compiler.tree.statements.BLangReturn in project ballerina by ballerina-lang.

the class IterableCodeDesugar method generateDefaultIfEmpty.

/**
 * Generates following.
 *
 * if(count == 0){
 * return;
 * }
 *
 * @param blockStmt target
 * @param ctx       current context
 */
private void generateDefaultIfEmpty(BLangBlockStmt blockStmt, IterableContext ctx) {
    if (ctx.resultVar.symbol.type.tag > TypeTags.TYPEDESC) {
        return;
    }
    final DiagnosticPos pos = blockStmt.pos;
    final BLangBinaryExpr equality = (BLangBinaryExpr) TreeBuilder.createBinaryExpressionNode();
    equality.pos = pos;
    equality.type = symTable.booleanType;
    equality.opKind = OperatorKind.EQUAL;
    equality.lhsExpr = ASTBuilderUtil.createVariableRef(pos, ctx.countVar.symbol);
    equality.rhsExpr = ASTBuilderUtil.createLiteral(pos, symTable.intType, 0L);
    equality.opSymbol = (BOperatorSymbol) symResolver.resolveBinaryOperator(OperatorKind.EQUAL, symTable.intType, symTable.intType);
    final BLangIf ifNode = ASTBuilderUtil.createIfStmt(pos, blockStmt);
    ifNode.expr = equality;
    ifNode.body = ASTBuilderUtil.createBlockStmt(pos);
    if (ctx.resultVar.symbol.type.tag <= TypeTags.FLOAT) {
        final BLangAssignment assign = ASTBuilderUtil.createAssignmentStmt(pos, ifNode.body);
        assign.varRefs.add(ASTBuilderUtil.createVariableRef(pos, ctx.resultVar.symbol));
        switch(ctx.resultVar.symbol.type.tag) {
            case TypeTags.INT:
                assign.expr = ASTBuilderUtil.createLiteral(pos, symTable.intType, 0L);
                break;
            case TypeTags.FLOAT:
                assign.expr = ASTBuilderUtil.createLiteral(pos, symTable.floatType, 0D);
                break;
        }
    }
    final BLangReturn returnStmt = ASTBuilderUtil.createReturnStmt(pos, ifNode.body);
    returnStmt.addExpression(ASTBuilderUtil.createVariableRef(pos, ctx.resultVar.symbol));
}

Example 12 with BLangReturn

use of org.wso2.ballerinalang.compiler.tree.statements.BLangReturn in project ballerina by ballerina-lang.

the class IterableCodeDesugar method generateStreamingIteratorBlock.

private void generateStreamingIteratorBlock(IterableContext ctx, BLangFunction funcNode, LinkedList<Operation> streamOperations) {
    final Operation firstOperation = ctx.getFirstOperation();
    final DiagnosticPos pos = firstOperation.pos;
    // Generate streaming based function Body.
    if (isReturningIteratorFunction(ctx)) {
        if (ctx.resultType.tag != TypeTags.TABLE) {
            // This should be the select operation. No need of a count variable.
            createCounterVarDefStmt(funcNode, ctx);
        }
        createResultVarDefStmt(funcNode, ctx);
        ctx.iteratorResultVariables = createIteratorResultVariables(ctx, streamOperations.getLast().retVar, funcNode);
    } else {
        ctx.iteratorResultVariables = Collections.emptyList();
    }
    // Create variables required.
    final List<BLangVariable> foreachVariables = createForeachVariables(ctx, ctx.getFirstOperation().argVar, funcNode);
    // Define all undefined variables.
    defineRequiredVariables(ctx, streamOperations, foreachVariables, funcNode);
    // Generate foreach iteration.
    final BLangForeach foreachStmt = ASTBuilderUtil.createForeach(pos, funcNode.body, ASTBuilderUtil.createVariableRef(pos, ctx.collectionVar.symbol), ASTBuilderUtil.createVariableRefList(pos, foreachVariables), ctx.foreachTypes);
    if (foreachVariables.size() > 1) {
        // Create tuple, for lambda invocation.
        final BLangAssignment assignmentStmt = ASTBuilderUtil.createAssignmentStmt(pos, foreachStmt.body);
        assignmentStmt.declaredWithVar = true;
        assignmentStmt.varRefs.add(ASTBuilderUtil.createVariableRef(pos, ctx.getFirstOperation().argVar.symbol));
        final BLangBracedOrTupleExpr tupleExpr = (BLangBracedOrTupleExpr) TreeBuilder.createBracedOrTupleExpression();
        for (BLangVariable foreachVariable : foreachVariables) {
            tupleExpr.expressions.add(ASTBuilderUtil.createVariableRef(pos, foreachVariable.symbol));
        }
        tupleExpr.isBracedExpr = foreachVariables.size() == 1;
        tupleExpr.type = new BTupleType(getTupleTypeList(ctx.getFirstOperation().inputType));
        assignmentStmt.expr = tupleExpr;
    }
    // Generate Operations related
    ctx.operations.forEach(operation -> generateOperationCode(foreachStmt.body, operation));
    // Generate aggregator and result
    if (isReturningIteratorFunction(ctx)) {
        if (ctx.iteratorResultVariables.size() > 1) {
            // Destructure return Values.
            final BLangTupleDestructure tupleAssign = (BLangTupleDestructure) TreeBuilder.createTupleDestructureStatementNode();
            tupleAssign.pos = pos;
            tupleAssign.declaredWithVar = true;
            foreachStmt.body.addStatement(tupleAssign);
            tupleAssign.expr = ASTBuilderUtil.createVariableRef(pos, ctx.getLastOperation().retVar.symbol);
            tupleAssign.varRefs.addAll(ASTBuilderUtil.createVariableRefList(pos, ctx.iteratorResultVariables));
        }
        generateAggregator(foreachStmt.body, ctx);
        generateFinalResult(funcNode.body, ctx);
    }
    final BLangReturn returnStmt = ASTBuilderUtil.createReturnStmt(firstOperation.pos, funcNode.body);
    if (isReturningIteratorFunction(ctx)) {
        returnStmt.addExpression(ASTBuilderUtil.createVariableRef(pos, ctx.resultVar.symbol));
    }
}

Example 13 with BLangReturn

use of org.wso2.ballerinalang.compiler.tree.statements.BLangReturn in project ballerina by ballerina-lang.

the class BLangPackageBuilder method addReturnStatement.

public void addReturnStatement(DiagnosticPos pos, Set<Whitespace> ws, boolean exprAvailable) {
    BLangReturn retStmt = (BLangReturn) TreeBuilder.createReturnNode();
    retStmt.pos = pos;
    retStmt.addWS(ws);
    if (exprAvailable) {
        retStmt.addWS(commaWsStack.pop());
        for (ExpressionNode expr : this.exprNodeListStack.pop()) {
            retStmt.exprs.add((BLangExpression) expr);
        }
    }
    addStmtToCurrentBlock(retStmt);
}