/**
* Wrap the given expression with a logging method call. Some kinds of expressions don't like
* being wrapped in a simple fashion and so we have to handle them specially. The
* ExpressionTransformer doesn't have methods for each type so we check for each one here.
*
* <p>TODO: There are potentially other expressions which need special handling (like indexing and
* variables). This code may be working because those types have their parent being wrapped and we
* don't transform their children.
*
* @param lineNumber line number to report for this value
* @param expression the expression whose value we want to report
* @return an expression that computes the value and also reports it somewheres
*/
private Expression loggingExpression(Integer lineNumber, Expression expression) {
if (expression instanceof DeclarationExpression) {
DeclarationExpression declarationExpression = (DeclarationExpression) expression;
return new DeclarationExpression(
declarationExpression.getLeftExpression(),
declarationExpression.getOperation(),
loggingExpression(lineNumber, declarationExpression.getRightExpression()));
}
if (expression instanceof BooleanExpression) {
BooleanExpression booleanExpression = (BooleanExpression) expression;
return new BooleanExpression(
new MethodCallExpression(
new VariableExpression("this"),
"_log",
new ArgumentListExpression(
new ConstantExpression(lineNumber), booleanExpression.getExpression())));
}
return new MethodCallExpression(
new VariableExpression("this"),
"_log",
new ArgumentListExpression(new ConstantExpression(lineNumber), expression));
}
