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import std.stdio;
import std.string;
import std.variant;
import std.container.util : make;
import base.stack;
import definition = base.definition;
import primitives = primitives.eval;
Stack!Token evaluate(Token token) {
try {
if ( primitives.evaluate(token) ) {
return primitives.result;
} else {
return token.visit!(
(int value) => Stack!Token(Token(value)),
(bool value) => Stack!Token(Token(value)),
(string word ) => definition.get(word)
);
}
}
catch (Exception ex) {
writeln("Error: ", ex.msg);
return Stack!Token();
}
}
void process(string value) {
auto buffer = make!(Stack!Token)(toToken(value));
do {
Token current = buffer.pop;
Stack!Token result = evaluate(current);
if ( !result.empty ) {
if ( result.front == current ) {
stack.push(current);
} else {
buffer.insertFront(result[]);
}
}
}
while ( !buffer.empty );
}
void main() {
while ( !stdin.eof ) {
foreach ( token; stdin.readln.split ) {
process(token);
}
}
}
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