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Hide Expression


Has the conventional meaning as generalized to an expression language -- evaluates the contained expression in a scope box. The value of the hide expression is the value of the contained expression. Any variables defined by the contained expression are not visible in the succeeding scope of the hide expression.

BNF:
"{" eExpr "}"
XML DTD:
<!ELEMENT hideExpr (%eExpr;)>
Java:
"{" jExpr "}"
Example:
def x := {
    def y := 3
    y * 2
}
in Kernel-E:
def x := {
    def y := 3
    y.multiply(2)
}
in XML:
<defineExpr>
    <finalPattern>
        <Noun>x</Noun>
        <Noun>any</Noun>
    </finalPattern>
    <hideExpr>
        <seqExpr>
            <defineExpr>
                <finalPattern>
                    <Noun>y</Noun>
                    <Noun>any</Noun>
                </finalPattern>
                <Integer>3</Integer>
            </defineExpr>
            <callExpr>
                <Noun>y</Noun>
                <Verb>multiply</Verb>
                <Integer>2</Integer>
            </callExpr>
        </seqExpr>
    </hideExpr>
</defineExpr>
in Java:
Object result_5;
{
    Object y = BigInteger.valueOf(3);
    result_5 = E.call(y, "multiply", BigInteger.valueOf(2));
}
Object x = result_5;

 

x
 
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