|
public static Condition ( System.Linq.Expressions test, System.Linq.Expressions ifTrue, System.Linq.Expressions ifFalse ) : |
||
| test | System.Linq.Expressions | |
| ifTrue | System.Linq.Expressions | |
| ifFalse | System.Linq.Expressions | |
| Результат | ||
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
return(AstFactory.Condition(
_condition.TransformCondition(gen, false),
gen.TransformStatementsToExpression(_statements),
gen.TransformStatementsToExpression(_elseClause != null ? _elseClause.Statements : null)
));
}
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
return(AstFactory.Condition(
_condition.TransformReadBoolean(gen, true),
_trueExpression.TransformRead(gen),
_falseExpression.TransformRead(gen)
));
}
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
return(AstFactory.Condition(
Methods.IsFalse.OpCall(AstFactory.Box(_condition.TransformRead(gen))),
gen.TransformStatementsToExpression(_statements),
gen.TransformStatementsToExpression(_elseClause != null ? _elseClause.Statements : null)
));
}
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
MSA.Expression result;
if (_elseStatements != null)
{
// ... else body end
result = gen.TransformStatementsToExpression(_elseStatements);
}
else
{
// no else clause => the result of the if-expression is nil:
result = AstUtils.Constant(null);
}
MSA.Expression value;
if (_value != null)
{
value = gen.CurrentScope.DefineHiddenVariable("#case-compare-value", typeof(object));
}
else
{
value = null;
}
if (_whenClauses != null)
{
for (int i = _whenClauses.Count - 1; i >= 0; i--)
{
// emit: else (if (condition) body else result)
result = AstFactory.Condition(
TransformWhenCondition(gen, _whenClauses[i].Comparisons, _whenClauses[i].ComparisonArray, value),
gen.TransformStatementsToExpression(_whenClauses[i].Statements),
result
);
}
}
if (_value != null)
{
result = Ast.Block(
Ast.Assign(value, Ast.Convert(_value.TransformRead(gen), typeof(object))),
result
);
}
return(result);
}
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
MSA.Expression result;
int i = _elseIfClauses.Count - 1;
if (i >= 0 && _elseIfClauses[i].Condition == null)
{
// ... else body end
result = gen.TransformStatementsToExpression(_elseIfClauses[i].Statements);
i--;
}
else
{
// no else clause => the result of the if-expression is nil:
result = AstUtils.Constant(null);
}
while (i >= 0)
{
// emit: else (if (condition) body else result)
result = AstFactory.Condition(
_elseIfClauses[i].Condition.TransformCondition(gen, true),
gen.TransformStatementsToExpression(_elseIfClauses[i].Statements),
result
);
i--;
}
// if (condition) body else result
return(AstFactory.Condition(
_condition.TransformCondition(gen, true),
gen.TransformStatementsToExpression(_body),
result
));
}
