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

Example 76 with BLangVariable

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

the class Desugar method getSafeAssignErrorPattern.

private BLangMatchStmtPatternClause getSafeAssignErrorPattern(DiagnosticPos pos, BSymbol invokableSymbol) {
    // From here onwards we assume that this function has only one return type
    // Owner of the variable symbol must be an invokable symbol
    boolean noRetParams = ((BInvokableType) invokableSymbol.type).retTypes.isEmpty();
    boolean returnErrorType = false;
    if (!noRetParams) {
        BType retType = ((BInvokableType) invokableSymbol.type).retTypes.get(0);
        Set<BType> returnTypeSet = retType.tag == TypeTags.UNION ? ((BUnionType) retType).memberTypes : new HashSet<BType>() {

            {
                add(retType);
            }
        };
        returnErrorType = returnTypeSet.stream().anyMatch(type -> types.isAssignable(type, symTable.errStructType));
    }
    // Create the pattern to match the error type
    // 1) Create the pattern variable
    String patternFailureCaseVarName = GEN_VAR_PREFIX.value + "t_failure";
    BLangVariable patternFailureCaseVar = ASTBuilderUtil.createVariable(pos, patternFailureCaseVarName, symTable.errStructType, null, new BVarSymbol(0, names.fromString(patternFailureCaseVarName), this.env.scope.owner.pkgID, symTable.errStructType, this.env.scope.owner));
    // 2) Create the pattern block
    BLangVariableReference patternFailureCaseVarRef = ASTBuilderUtil.createVariableRef(pos, patternFailureCaseVar.symbol);
    BLangBlockStmt patternBlockFailureCase = (BLangBlockStmt) TreeBuilder.createBlockNode();
    patternBlockFailureCase.pos = pos;
    if (noRetParams || !returnErrorType) {
        // throw e
        BLangThrow throwStmt = (BLangThrow) TreeBuilder.createThrowNode();
        throwStmt.pos = pos;
        throwStmt.expr = patternFailureCaseVarRef;
        patternBlockFailureCase.stmts.add(throwStmt);
    } else {
        // return e;
        BLangReturn returnStmt = (BLangReturn) TreeBuilder.createReturnNode();
        returnStmt.pos = pos;
        returnStmt.exprs = new ArrayList<BLangExpression>() {

            {
                add(patternFailureCaseVarRef);
            }
        };
        patternBlockFailureCase.stmts.add(returnStmt);
    }
    return ASTBuilderUtil.createMatchStatementPattern(pos, patternFailureCaseVar, patternBlockFailureCase);
}

Example 77 with BLangVariable

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

the class Desugar method visit.

@Override
public void visit(BLangVariableDef varDefNode) {
    if (varDefNode.var.expr instanceof BLangRecordLiteral && ((BLangRecordLiteral) varDefNode.var.expr).type.tag == TypeTags.STREAM) {
        ((BLangRecordLiteral) varDefNode.var.expr).name = varDefNode.var.name;
    }
    varDefNode.var = rewrite(varDefNode.var, env);
    BLangVariable varNode = varDefNode.var;
    // Generate default init expression, if rhs expr is null
    if (varNode.expr == null) {
        varNode.expr = getInitExpr(varNode.type);
    }
    if (!varNode.safeAssignment) {
        result = varDefNode;
        return;
    }
    // Desugar the =? operator with the match statement
    // 
    // e.g.
    // var f =? openFile("/tmp/foo.txt"); // openFile: () -> (File | error)
    // 
    // {
    // File f;
    // match openFile("/tmp/foo.txt") {
    // File _$_f1 => f = _$_f1;
    // error e => throw e | return e
    // }
    // }
    // Create the pattern to match the success case
    BLangMatchStmtPatternClause patternSuccessCase = getSafeAssignSuccessPattern(varNode.pos, varNode.symbol.type, true, varNode.symbol, null);
    BLangMatchStmtPatternClause patternErrorCase = getSafeAssignErrorPattern(varNode.pos, varNode.symbol.owner);
    // Create the match statement
    BLangMatch matchStmt = ASTBuilderUtil.createMatchStatement(varNode.expr.pos, varNode.expr, new ArrayList<BLangMatchStmtPatternClause>() {

        {
            add(patternSuccessCase);
            add(patternErrorCase);
        }
    });
    // var f =? foo() -> var f;
    varNode.expr = null;
    varNode.safeAssignment = false;
    BLangBlockStmt safeAssignmentBlock = ASTBuilderUtil.createBlockStmt(varDefNode.pos, new ArrayList<BLangStatement>() {

        {
            add(varDefNode);
            add(matchStmt);
        }
    });
    result = rewrite(safeAssignmentBlock, this.env);
}

Example 78 with BLangVariable

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

the class Desugar method createAssignmentStmt.

// TODO: Same function is used in symbol enter. Refactor this to reuse the same function.
private StatementNode createAssignmentStmt(BLangVariable variable) {
    BLangSimpleVarRef varRef = (BLangSimpleVarRef) TreeBuilder.createSimpleVariableReferenceNode();
    varRef.pos = variable.pos;
    varRef.variableName = variable.name;
    varRef.symbol = variable.symbol;
    varRef.type = variable.type;
    varRef.pkgAlias = (BLangIdentifier) TreeBuilder.createIdentifierNode();
    BLangAssignment assignmentStmt = (BLangAssignment) TreeBuilder.createAssignmentNode();
    assignmentStmt.expr = variable.expr;
    assignmentStmt.pos = variable.pos;
    assignmentStmt.addVariable(varRef);
    return assignmentStmt;
}

Example 79 with BLangVariable

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

the class Desugar method visit.

@Override
public void visit(BLangMatch matchStmt) {
    // Here we generate an if-else statement for the match statement
    // Here is an example match statement
    // 
    // match expr {
    // int k => io:println("int value: " + k);
    // string s => io:println("string value: " + s);
    // json j => io:println("json value: " + s);
    // 
    // }
    // 
    // Here is how we convert the match statement to an if-else statement. The last clause should always be the
    // else clause
    // 
    // string | int | json | any _$$_matchexpr = expr;
    // if ( _$$_matchexpr isassignable int ){
    // int k = (int) _$$_matchexpr; // unbox
    // io:println("int value: " + k);
    // 
    // } else if (_$$_matchexpr isassignable string ) {
    // string s = (string) _$$_matchexpr; // unbox
    // io:println("string value: " + s);
    // 
    // } else if ( _$$_matchexpr isassignable float ||    // should we consider json[] as well
    // _$$_matchexpr isassignable boolean ||
    // _$$_matchexpr isassignable json) {
    // 
    // } else {
    // // handle the last pattern
    // any case..
    // }
    // 
    // First create a block statement to hold generated statements
    BLangBlockStmt matchBlockStmt = (BLangBlockStmt) TreeBuilder.createBlockNode();
    matchBlockStmt.pos = matchStmt.pos;
    // Create a variable definition to store the value of the match expression
    String matchExprVarName = GEN_VAR_PREFIX.value;
    BLangVariable matchExprVar = ASTBuilderUtil.createVariable(matchStmt.expr.pos, matchExprVarName, matchStmt.expr.type, matchStmt.expr, new BVarSymbol(0, names.fromString(matchExprVarName), this.env.scope.owner.pkgID, matchStmt.expr.type, this.env.scope.owner));
    // Now create a variable definition node
    BLangVariableDef matchExprVarDef = ASTBuilderUtil.createVariableDef(matchBlockStmt.pos, matchExprVar);
    // Add the var def statement to the block statement
    // string | int _$$_matchexpr = expr;
    matchBlockStmt.stmts.add(matchExprVarDef);
    // Create if/else blocks with typeof binary expressions for each pattern
    matchBlockStmt.stmts.add(generateIfElseStmt(matchStmt, matchExprVar));
    rewrite(matchBlockStmt, this.env);
    result = matchBlockStmt;
}

Example 80 with BLangVariable

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

the class Desugar method getSafeAssignSuccessPattern.

private BLangMatchStmtPatternClause getSafeAssignSuccessPattern(DiagnosticPos pos, BType lhsType, boolean isVarDef, BVarSymbol varSymbol, BLangExpression lhsExpr) {
    // File _$_f1 => f = _$_f1;
    // 1) Create the pattern variable
    String patternSuccessCaseVarName = GEN_VAR_PREFIX.value + "t_match";
    BLangVariable patternSuccessCaseVar = ASTBuilderUtil.createVariable(pos, patternSuccessCaseVarName, lhsType, null, new BVarSymbol(0, names.fromString(patternSuccessCaseVarName), this.env.scope.owner.pkgID, lhsType, this.env.scope.owner));
    // 2) Create the pattern body
    BLangExpression varRefExpr;
    if (isVarDef) {
        varRefExpr = ASTBuilderUtil.createVariableRef(pos, varSymbol);
    } else {
        varRefExpr = lhsExpr;
    }
    BLangVariableReference patternSuccessCaseVarRef = ASTBuilderUtil.createVariableRef(pos, patternSuccessCaseVar.symbol);
    BLangAssignment assignmentStmtSuccessCase = ASTBuilderUtil.createAssignmentStmt(pos, new ArrayList<BLangExpression>() {

        {
            add(varRefExpr);
        }
    }, patternSuccessCaseVarRef, false);
    BLangBlockStmt patternBlockSuccessCase = ASTBuilderUtil.createBlockStmt(pos, new ArrayList<BLangStatement>() {

        {
            add(assignmentStmtSuccessCase);
        }
    });
    return ASTBuilderUtil.createMatchStatementPattern(pos, patternSuccessCaseVar, patternBlockSuccessCase);
}