Package com.google.gwt.dev.js.ast

Examples of com.google.gwt.dev.js.ast.CanBooleanEval

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    public void endVisit(JsFor x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());

      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;

        // If false, replace with initializers and condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock();
          if (x.getInitExpr() != null) {
            block.getStatements().add(x.getInitExpr().makeStmt());
          }
          if (x.getInitVars() != null) {
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      JsExpression expr = x.getIfExpr();
      JsStatement thenStmt = x.getThenStmt();
      JsStatement elseStmt = x.getElseStmt();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;
        JsStatement onlyStmtToExecute;
        JsStatement removed;
        if (cond.isBooleanTrue()) {
          onlyStmtToExecute = thenStmt;
          removed = elseStmt;
        } else if (cond.isBooleanFalse()) {
          onlyStmtToExecute = elseStmt;
          removed = thenStmt;
        } else {
          return;
        }
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    public void endVisit(JsWhile x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());

      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;

        // If false, replace with condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock();
          block.getStatements().add(expr.makeStmt());
          JsStatement decls = ensureDeclarations(x.getBody());
          if (decls != null) {
            block.getStatements().add(decls);
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   * </pre>
   */
  protected static void shortCircuitAnd(JsExpression arg1, JsExpression arg2,
      JsContext<JsExpression> ctx) {
    if (arg1 instanceof CanBooleanEval) {
      CanBooleanEval eval1 = (CanBooleanEval) arg1;
      if (eval1.isBooleanTrue() && !arg1.hasSideEffects()) {
        ctx.replaceMe(arg2);
      } else if (eval1.isBooleanFalse()) {
        ctx.replaceMe(arg1);
      }
    }
  }
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   * </pre>
   */
  protected static void shortCircuitOr(JsExpression arg1, JsExpression arg2,
      JsContext<JsExpression> ctx) {
    if (arg1 instanceof CanBooleanEval) {
      CanBooleanEval eval1 = (CanBooleanEval) arg1;
      if (eval1.isBooleanTrue()) {
        ctx.replaceMe(arg1);
      } else if (eval1.isBooleanFalse() && !arg1.hasSideEffects()) {
        ctx.replaceMe(arg2);
      }
    }
  }
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      JsExpression condExpr = x.getTestExpression();
      JsExpression thenExpr = x.getThenExpression();
      JsExpression elseExpr = x.getElseExpression();
      if (condExpr instanceof CanBooleanEval) {
        CanBooleanEval condEval = (CanBooleanEval) condExpr;
        if (condEval.isBooleanTrue()) {
          // e.g. (true() ? then : else) -> true() && then
          JsBinaryOperation binOp = new JsBinaryOperation(JsBinaryOperator.AND,
              condExpr, thenExpr);
          ctx.replaceMe(accept(binOp));
        } else if (condEval.isBooleanFalse()) {
          // e.g. (false() ? then : else) -> false() || else
          JsBinaryOperation binOp = new JsBinaryOperation(JsBinaryOperator.OR,
              condExpr, elseExpr);
          ctx.replaceMe(accept(binOp));
        }
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    public void endVisit(JsDoWhile x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());

      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;

        // If false, replace do with do's body
        if (cond.isBooleanFalse()) {
          // Unless it contains break/continue statements
          FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
          visitor.accept(x.getBody());
          if (!visitor.hasBreakContinueStatements()) {
            JsBlock block = new JsBlock();
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    public void endVisit(JsFor x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());

      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;

        // If false, replace with initializers and condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock();
          if (x.getInitExpr() != null) {
            block.getStatements().add(x.getInitExpr().makeStmt());
          }
          if (x.getInitVars() != null) {
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      JsExpression expr = x.getIfExpr();
      JsStatement thenStmt = x.getThenStmt();
      JsStatement elseStmt = x.getElseStmt();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;
        JsStatement onlyStmtToExecute;
        JsStatement removed;
        if (cond.isBooleanTrue()) {
          onlyStmtToExecute = thenStmt;
          removed = elseStmt;
        } else if (cond.isBooleanFalse()) {
          onlyStmtToExecute = elseStmt;
          removed = thenStmt;
        } else {
          return;
        }
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    public void endVisit(JsWhile x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());

      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;

        // If false, replace with condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock();
          block.getStatements().add(expr.makeStmt());
          JsStatement decls = ensureDeclarations(x.getBody());
          if (decls != null) {
            block.getStatements().add(decls);
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Related Classes of com.google.gwt.dev.js.ast.CanBooleanEval

  • com.google.gwt.dev.js.JsStaticEval
  • com.google.gwt.dev.js.JsStaticEval$StaticEvalVisitor
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