Code Separators and Code Blocks

• If the value of property char ExpressionSeparatorCharacter { get; } in UniversalExpressionParser.IExpressionLanguageProvider is not equal to character ‘0’, multiple expressions can be used in a single expression.

For example if the value of property ExpressionSeparatorCharacter is ‘;’ the expression “var x=f1(y);println(x)” will be parsed to a list of two expression items for “x=f1(y)” and “println(x)”. Otherwise, the parser will report an error for this expression (see section on Error Reporting for more details on errors).

• If both values of properties char CodeBlockStartMarker { get; } and string CodeBlockEndMarker { get; } in UniversalExpressionParser.IExpressionLanguageProvider are not equal to character ‘0’, code block expressions can be used to combine multiple expressions into code block expression items of type UniversalExpressionParser.ExpressionItems.ICodeBlockExpressionItem.

• For example if the values of properties CodeBlockStartMarker and CodeBlockEndMarker are ‘{’ and ‘}’, the expression below will be parsed to two code block expressions of type UniversalExpressionParser.ExpressionItems.ICodeBlockExpressionItem. Otherwise, the parser will report errors.

{
    var x = y^2;
    println(x);
}

{
    fl(x1, x2);
    println(x) // No need for ';' after the last expression
}

Click here to see the visualized instance of UniversalExpressionParser.IParseExpressionResult

More complex examples of code blocks and code separators

var y = x1 + 2.5 * x2;

f1()
{
    // Code block used as function body (see examples in Postfixes folder)
}

var z = e ^ 2.3;
{
    var x = 5 * y;
    println("x=" + x);

    {
        var y1 = 10 * x;
        println(getExp(y1));
    }

    {
        var y2 = 20 * x;
        println(getExp(y2));
    }

    getExp(x) : double
    {
        // another code block used as function body (see examples in Postfixes folder)
        return e^x;
    }
}

f2()
{
    // Another code block used as function body (see examples in Postfixes folder)
}

{
    // Another code block
}

public class Dog
{
    public Bark()
    {
        // Note, code separator ';' is not necessary, if the expression is followed by code block end marker '}'.
        println("bark")
    }
}

Click here to see the visualized instance of UniversalExpressionParser.IParseExpressionResult