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import std.stdio;
import std.string;
import std.variant;
import std.typecons;
import src.stack;
static import definition = src.definition;
static import primitives = src.primitives.eval;
Stack!Token resolve(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) {
Stack!Token buffer;
Token token = toToken(value);
if ( !definition.handle(token) ) {
buffer = resolve(token);
}
while ( !buffer.empty ) {
Token current = buffer.pop;
if ( !definition.handle(current) ) {
Stack!Token resolved = resolve(current);
if ( !resolved.empty ) {
if ( resolved.front == current ) {
stack.push(current);
} else {
buffer.insertFront(resolved[]);
}
}
}
}
}
void main() {
while ( !stdin.eof ) {
foreach ( token; stdin.readln.split ) {
process(token);
}
}
}
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