public IExpr evaluate(final IAST ast) {
Validate.checkSize(ast, 3);
if (ast.get(1).isSymbol()) {
if (ast.get(2).isAST("Blank")) {
IAST blank = (IAST) ast.get(2);
if (blank.size() == 1) {
return F.$p((ISymbol) ast.get(1));
}
if (blank.size() == 2) {
return F.$p((ISymbol) ast.get(1), blank.get(1));
}
}
if (ast.get(2).isPattern()) {
IPattern blank = (IPattern) ast.get(2);
if (blank.isBlank()) {
return F.$p((ISymbol) ast.get(1), blank.getCondition());
}
}
}
return null;
}
public int visit(IPattern element) {
return element.hashCode();
}