Examples with IfStatement com.google.devtools.j2objc.ast.IfStatement used on opensource projects

Example 1 with IfStatement

use of com.google.devtools.j2objc.ast.IfStatement in project j2objc by google.

the class ConstantBranchPruner method endVisit.

@Override
public void endVisit(IfStatement node) {
    Expression expr = node.getExpression();
    Boolean value = getKnownValue(expr);
    if (value != null) {
        Statement sideEffects = getSideEffects(expr);
        if (sideEffects != null) {
            TreeUtil.insertBefore(node, sideEffects);
        }
        if (value) {
            node.replaceWith(TreeUtil.remove(node.getThenStatement()));
        } else if (node.getElseStatement() != null) {
            node.replaceWith(TreeUtil.remove(node.getElseStatement()));
        } else {
            node.remove();
        }
    }
}

Example 2 with IfStatement

use of com.google.devtools.j2objc.ast.IfStatement in project j2objc by google.

the class UnsequencedExpressionRewriter method extractInfixConditional.

private void extractInfixConditional(List<Statement> stmtList, InfixExpression conditional, List<VariableAccess> toExtract) {
    InfixExpression.Operator op = conditional.getOperator();
    List<Expression> branches = conditional.getOperands();
    int lastIfExtractIdx = 0;
    VariableElement conditionalVar = null;
    int lastExtracted = 0;
    Expression lastBranch = null;
    for (int i = 0; i < toExtract.size(); i++) {
        VariableAccess access = toExtract.get(i);
        TreeNode node = access.expression;
        while (node.getParent() != conditional) {
            node = node.getParent();
        }
        assert node instanceof Expression;
        Expression branch = (Expression) node;
        // Extract all accesses from the previous branch.
        if (lastBranch != null && branch != lastBranch) {
            extractOrderedAccesses(stmtList, lastBranch, toExtract.subList(lastExtracted, i));
            lastExtracted = i;
        }
        lastBranch = branch;
        // If there's a new access in a new branch, then we extract an if-statement.
        if (branch != branches.get(lastIfExtractIdx)) {
            TypeMirror boolType = typeUtil.getBoolean();
            if (conditionalVar == null) {
                conditionalVar = GeneratedVariableElement.newLocalVar("unseq$" + count++, boolType, currentMethod);
                conditional.replaceWith(new SimpleName(conditionalVar));
                stmtList.add(new VariableDeclarationStatement(conditionalVar, null));
            }
            List<Expression> subBranches = branches.subList(lastIfExtractIdx, branches.indexOf(branch));
            IfStatement newIf = new IfStatement();
            Expression ifExpr = new Assignment(new SimpleName(conditionalVar), conditionalFromSubBranches(subBranches, op));
            if (op == InfixExpression.Operator.CONDITIONAL_OR) {
                ifExpr = new PrefixExpression(boolType, PrefixExpression.Operator.NOT, ParenthesizedExpression.parenthesize(ifExpr));
            }
            newIf.setExpression(ifExpr);
            stmtList.add(newIf);
            Block thenBlock = new Block();
            stmtList = thenBlock.getStatements();
            newIf.setThenStatement(thenBlock);
            lastIfExtractIdx = branches.indexOf(branch);
        }
    }
    extractOrderedAccesses(stmtList, lastBranch, toExtract.subList(lastExtracted, toExtract.size()));
    if (conditionalVar != null) {
        List<Expression> remainingBranches = Lists.newArrayList();
        remainingBranches.add(new SimpleName(conditionalVar));
        remainingBranches.addAll(branches.subList(lastIfExtractIdx, branches.size()));
        stmtList.add(new ExpressionStatement(new Assignment(new SimpleName(conditionalVar), conditionalFromSubBranches(remainingBranches, op))));
    }
}

Example 3 with IfStatement

use of com.google.devtools.j2objc.ast.IfStatement in project j2objc by google.

the class GwtConverter method visit.

@Override
public boolean visit(IfStatement node) {
    if (isGwtTest(node.getExpression())) {
        if (node.getElseStatement() != null) {
            // Replace this node with the else statement.
            Statement replacement = TreeUtil.remove(node.getElseStatement());
            node.replaceWith(replacement);
            replacement.accept(this);
        } else {
            // with an empty statement.
            if (node.getParent() instanceof Block) {
                node.remove();
            } else {
                node.replaceWith(new EmptyStatement());
            }
        }
        return false;
    }
    return true;
}

Example 4 with IfStatement

use of com.google.devtools.j2objc.ast.IfStatement in project j2objc by google.

the class UnsequencedExpressionRewriter method createLoopTermination.

private IfStatement createLoopTermination(Expression loopCondition) {
    IfStatement newIf = new IfStatement();
    newIf.setExpression(new PrefixExpression(typeUtil.getBoolean(), PrefixExpression.Operator.NOT, ParenthesizedExpression.parenthesize(loopCondition.copy())));
    newIf.setThenStatement(new BreakStatement());
    return newIf;
}

Example 5 with IfStatement

use of com.google.devtools.j2objc.ast.IfStatement in project j2objc by google.

the class UnsequencedExpressionRewriter method visit.

@Override
public boolean visit(IfStatement node) {
    visitAndExtract(node.getExpression(), node);
    node.getThenStatement().accept(this);
    Statement elseStmt = node.getElseStatement();
    if (elseStmt != null) {
        elseStmt.accept(this);
    }
    return false;
}