Add a REPL.

This commit is contained in:
Danila Fedorin 2018-08-14 16:34:17 -07:00
parent 696c86fef0
commit d140ea6113

View File

@ -6,6 +6,9 @@ extern "C" {
#include "util.h"
}
// == Global State (uh-oh)
bool close_requested = false;
// == STRING Type
struct string {
std::string value;
@ -61,6 +64,8 @@ class abacus_ref {
abacus_ref(const abacus_ref& other);
abacus_ref& operator=(const abacus_ref& other);
abacus_ref& operator=(std::nullptr_t);
template <typename T>
bool operator==(T data);
operator libab_ref*() {
return &ref;
}
@ -90,6 +95,16 @@ abacus_ref& abacus_ref::operator=(std::nullptr_t t) {
return *this;
}
template <typename T>
bool abacus_ref::operator==(T data) {
return libab_ref_get(&ref) == (void*) data;
}
template <>
bool abacus_ref::operator==<std::nullptr_t>(std::nullptr_t t) {
return libab_ref_get(&ref) == t;
}
abacus_ref::~abacus_ref() {
libab_ref_free(&ref);
}
@ -148,6 +163,12 @@ OPERATOR_FUNCTION(minus, -)
OPERATOR_FUNCTION(times, *)
OPERATOR_FUNCTION(divide, /)
FUNCTION(quit) {
close_requested = true;
libab_get_unit_value(ab, into);
return LIBAB_SUCCESS;
}
// == Main class
class abacus {
private:
@ -198,11 +219,24 @@ abacus::~abacus() {
int main() {
abacus ab;
std::string buffer;
ab.add_function("quit", function_quit, "()->unit");
ab.add_function("print", function_print_string, "(str)->unit");
ab.add_function("to_string", function_to_string_num, "(num)->str");
ab.add_function("plus", function_plus, "(num, num)->num");
ab.add_function("minus", function_minus, "(num, num)->num");
ab.add_function("times", function_times, "(num, num)->num");
ab.add_function("divide", function_divide, "(num, num)->num");
ab.run("fun test(): unit {}; print(to_string(plus(1, times(3, 3))))");
while(!close_requested) {
std::cout << "> ";
std::getline(std::cin, buffer);
abacus_ref value = ab.run(buffer);
if(value == nullptr) {
std::cout << "Invalid expression." << std::endl;
}
}
}