AppendExpressionVisitor

An ExpressionVisitor that describes the way two expressions are joined together.

For example, in the Quarkdown source: .somefunction {three plus two is .sum {3} {2}} The argument to somefunction is a ComposedExpression built by these sub-expressions:

• StringValue(three plus two is )

• FunctionCall(sum, 3, 2) After the evaluation of the sum call (handled by EvalExpressionVisitor) has been executed, the output values are:

• StringValue(three plus two is )

• NumberValue(5) These two values are then joined together by this AppendExpressionVisitor, producing: StringValue(three plus two is 5)

The same principle applies to 'block expressions':

.if {...}
    Item 1
    .foreach {2..4}
        n:
        Item .n
    Item 5

The previous example contains a body composed of multiple expressions:

• StringValue(Item 1);

• FunctionCall(foreach) which returns an IterableValue of 3 elements;

• StringValue(Item 5). After appending these values, the resulting expression is an IterableValue (a GeneralCollectionValue in particular) which contains: Item 1, Item 2, Item 3, Item 4, Item 5.

Parameters

See also