/*
Copyright (C) 2019-2020 Andreas Franz Borchert
Michael Christian Lehn
----------------------------------------------------------------------------
The Astl Library for ULMasm is free software; you can redistribute it
and/or modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either version
2 of the License, or (at your option) any later version.
The Astl Library for ULMasm is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
attribution rules {
// leaf nodes have an immediate value
("integer" int) as node -> post {
node.value = int;
}
// evaluate sub nodes
("+" op1 op2) as node -> post {
node.value = op1.value + op2.value;
}
("-" op1 op2) as node -> post {
node.value = op1.value - op2.value;
}
// expression now has result
("expression" expr) as node -> post {
println(expr.value);
}
}