Examples of com.google.gwt.dev.jjs.ast.js.JMultiExpression

com.google.gwt.dev.jjs.ast.js.JMultiExpression
Represents multiple ordered expressions as a single compound expression.

  private static JExpression castImpl(JExpression original, SourceInfo info, JType type,
      JExpression exp) {
    info = getBestSourceInfo(original, info, exp);
    if (exp instanceof JMultiExpression) {
      // (T)(a,b,c) -> a,b,(T) c
      JMultiExpression expMulti = (JMultiExpression) exp;
      JMultiExpression newMulti = new JMultiExpression(info);
      newMulti.addExpressions(allButLast(expMulti.getExpressions()));
      newMulti.addExpressions(castImpl(null, info, type, last(expMulti.getExpressions())));
      // TODO(rluble): immediately simplify the resulting multi.
      // TODO(rluble): refactor common outward JMultiExpression movement.
      return newMulti;
    }
    if (type == exp.getType()) {

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      JExpression condExpr, JExpression thenExpr, JExpression elseExpr) {
    info = getBestSourceInfo(original, info, condExpr);
    if (condExpr instanceof JMultiExpression) {
      // (a,b,c)?d:e -> a,b,(c?d:e)
      // TODO(spoon): do this outward multi movement for all AST nodes
      JMultiExpression condMulti = (JMultiExpression) condExpr;
      JMultiExpression newMulti = new JMultiExpression(info);
      newMulti.addExpressions(allButLast(condMulti.getExpressions()));
      newMulti.addExpressions(conditionalImpl(null, info, type, last(condMulti.getExpressions()),
          thenExpr, elseExpr));
      // TODO(spoon): immediately simplify the resulting multi
      return newMulti;
    }
    if (condExpr instanceof JBooleanLiteral) {

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  private static JStatement ifStatementImpl(JIfStatement original, SourceInfo info,
      JExpression condExpr, JStatement thenStmt,JStatement elseStmt, JMethod currentMethod) {
    info = getBestSourceInfo(original, info, condExpr);
    if (condExpr instanceof JMultiExpression) {
      // if(a,b,c) d else e -> {a; b; if(c) d else e; }
      JMultiExpression condMulti = (JMultiExpression) condExpr;
      JBlock newBlock = new JBlock(info);
      for (JExpression expr : allButLast(condMulti.getExpressions())) {
        newBlock.addStmt(expr.makeStatement());
      }
      newBlock.addStmt(ifStatementImpl(null, info, last(condMulti.getExpressions()), thenStmt,
          elseStmt, currentMethod));
      // TODO(spoon): immediately simplify the resulting block
      return newBlock;
    }

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  private static JExpression notImpl(JPrefixOperation original, SourceInfo info, JExpression arg) {
    info = getBestSourceInfo(original, info, arg);
    if (arg instanceof JMultiExpression) {
      // !(a,b,c) -> (a,b,!c)
      JMultiExpression argMulti = (JMultiExpression) arg;
      JMultiExpression newMulti = new JMultiExpression(info);
      newMulti.addExpressions(allButLast(argMulti.getExpressions()));
      newMulti.addExpressions(notImpl(null, info, last(argMulti.getExpressions())));
      // TODO(spoon): immediately simplify the newMulti
      return newMulti;
    }
    if (arg instanceof JBinaryOperation) {
      // try to invert the binary operator

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  private static JExpression andImpl(JBinaryOperation original, SourceInfo info, JExpression lhs,
      JExpression rhs) {
    info = getBestSourceInfo(original, info, lhs);
    if (lhs instanceof JMultiExpression) {
      // (a,b,c)&&d -> a,b,(c&&d)
      JMultiExpression lhsMulti = (JMultiExpression) lhs;
      JMultiExpression newMulti = new JMultiExpression(info);
      newMulti.addExpressions(allButLast(lhsMulti.getExpressions()));
      newMulti.addExpressions(andImpl(null, info, last(lhsMulti.getExpressions()), rhs));
      // TODO(rluble): immediately simplify the resulting multi.
      // TODO(rluble): refactor common outward JMultiExpression movement.
      return newMulti;
    }
    if (lhs instanceof JBooleanLiteral) {

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  private static JExpression orImpl(JBinaryOperation original, SourceInfo info, JExpression lhs,
      JExpression rhs) {
    info = getBestSourceInfo(original, info, lhs);
    if (lhs instanceof JMultiExpression) {
      // (a,b,c)|| d -> a,b,(c||d)
      JMultiExpression lhsMulti = (JMultiExpression) lhs;
      JMultiExpression newMulti = new JMultiExpression(info);
      newMulti.addExpressions(allButLast(lhsMulti.getExpressions()));
      newMulti.addExpressions(orImpl(null, info, last(lhsMulti.getExpressions()), rhs));
      // TODO(rluble): immediately simplify the resulting multi.
      // TODO(rluble): refactor common outward JMultiExpression movement.
      return newMulti;
    }
    if (lhs instanceof JBooleanLiteral) {

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    }


    private JExpression makeReplacementForAssignment(SourceInfo info, JVariableRef variableRef,
        JExpression rhs) {
      // Replace with a multi, which may wind up empty.
      JMultiExpression multi = new JMultiExpression(info);


      // If the lhs is a field ref, evaluate it first.
      if (variableRef instanceof JFieldRef) {
        JFieldRef fieldRef = (JFieldRef) variableRef;
        JExpression instance = fieldRef.getInstance();
        if (instance != null) {
          multi.addExpressions(instance);
        }
      }


      // If there is an rhs, evaluate it second.
      if (rhs != null) {
        multi.addExpressions(rhs);
      }
      if (multi.getNumberOfExpressions() == 1) {
        return multi.getExpression(0);
      } else {
        return multi;
      }
    }

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    }


    private void replaceForPrunedParameters(JMethodCall x, JMethodCall newCall, Context ctx) {
      assert !x.getTarget().canBePolymorphic();
      List<JParameter> originalParams = methodToOriginalParamsMap.get(x.getTarget());
      JMultiExpression currentMulti = null;
      for (int i = 0, c = x.getArgs().size(); i < c; ++i) {
        JExpression arg = x.getArgs().get(i);
        JParameter param = null;
        if (i < originalParams.size()) {
          param = originalParams.get(i);
        }


        if (param != null && referencedNonTypes.contains(param)) {
          // If there is an existing multi, terminate it.
          if (currentMulti != null) {
            currentMulti.addExpressions(arg);
            newCall.addArg(currentMulti);
            currentMulti = null;
          } else {
            newCall.addArg(arg);
          }
        } else if (arg.hasSideEffects()) {
          // The argument is only needed for side effects, add it to a multi.
          if (currentMulti == null) {
            currentMulti = new JMultiExpression(x.getSourceInfo());
          }
          currentMulti.addExpressions(arg);
        }
      }


      // Add any orphaned parameters on the end. Extra params are OK.
      if (currentMulti != null) {

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          JExpressionStatement stmtExpr = (JExpressionStatement) stmt;
          if (stmtExpr.getExpr() instanceof JMultiExpression) {
            // Promote a multi's expressions to the current block
            x.removeStmt(i);
            int start = i;
            JMultiExpression multi = ((JMultiExpression) stmtExpr.getExpr());
            for (JExpression expr : multi.getExpressions()) {
              x.addStmt(i++, expr.makeStatement());
            }
            i = start - 1;
            continue;
          }

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       * irrelevant. We can inline the constant, if any, but we might also need
       * to evaluate an instance and run a clinit.
       */
      // We can inline the constant, but we might also need to evaluate an
      // instance and run a clinit.
      JMultiExpression multi = new JMultiExpression(x.getSourceInfo());


      JExpression instance = x.getInstance();
      if (instance != null) {
        multi.addExpressions(instance);
      }


      if (x.hasClinit()) {
        multi.addExpressions(createClinitCall(x.getSourceInfo(), x.getField().getEnclosingType()));
      }


      if (literal != null) {
        multi.addExpressions(literal);
      }


      ctx.replaceMe(this.accept(multi));
    }

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