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primitives.cpp
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primitives.cpp
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#include "primitives.hpp"
#include <cassert>
#include "ant.hpp"
static Ant* ant_ptr(stree::DataPtr ant) {
assert(ant);
return static_cast<Ant*>(ant);
}
void init_environment(stree::Environment& env) {
env.add_function("forward", 0, ant::forward, 1);
env.add_function("left", 0, ant::left, 1);
env.add_function("right", 0, ant::right, 1);
env.add_function("progn2", 2, ant::progn);
env.add_function("progn3", 3, ant::progn);
env.add_select_function("if-food-ahead", 2, 0, ant::if_food_ahead);
}
namespace ant {
stree::Value forward(const stree::Arguments&, stree::DataPtr ant) {
ant_ptr(ant)->forward();
return stree::Value();
}
stree::Value left(const stree::Arguments&, stree::DataPtr ant) {
ant_ptr(ant)->left();
return stree::Value();
}
stree::Value right(const stree::Arguments&, stree::DataPtr ant) {
ant_ptr(ant)->right();
return stree::Value();
}
stree::Value progn(const stree::Arguments&, stree::DataPtr) {
// do nothing
return stree::Value();
}
unsigned if_food_ahead(const stree::Arguments&, stree::DataPtr ant) {
return ant_ptr(ant)->is_food_ahead() ? 0 : 1;
}
}