Some random progress

CMakeLists.txt

@@ -13,7 +13,7 @@ add_executable(sugar
         include/molasses/lexer.h
         src/molasses/parser_primitives.cpp
         include/molasses/parser_primitives.h
-        include/molasses/generator_primitives.h)
+        include/molasses/generator_primitives.h src/molasses/interpreter.cpp)
 
 function(add_expect_test [testname filename])
     add_test(

include/molasses/parser_primitives.h

@@ -214,6 +214,7 @@ namespace molasses {
 	std::vector<std::string> operator>>(std::vector<std::string> current_stack, const operation& next_op);
 	
 	std::optional<int32_t> try_parse_int32(const std::string& str);
+	std::optional<int64_t> try_parse_int64(const std::string& str);
 	
     struct parser_context {
         std::vector<std::shared_ptr<type>> types;
@@ -229,7 +230,11 @@ namespace molasses {
         parser_context parser;
         std::vector<std::shared_ptr<procedure_operation>> procedures;
     };
-	
+
+    using success_t = bool;
+
+    std::tuple<interpreter_stack, generate_context, std::optional<std::shared_ptr<std::runtime_error>>> interpret(interpreter_stack, generate_context, std::string );
+
     generate_context parse(parser_context, const lexed_output&);
     std::vector<std::string> generate(const generate_context&);
 

src/main.cpp

@@ -111,6 +111,19 @@ int main(int argc, char** argv) {
                     compile_stack.emplace(lexer_1);
                 } else
                     throw build_system_error("merge-all expects at least 1 lexed outputs\n");
+            } else if(elem == "interpret") {
+                if(not compile_stack.empty() and std::holds_alternative<molasses::generate_context>(compile_stack.top())) {
+                    auto context = std::get<molasses::generate_context>(compile_stack.top());
+                    compile_stack.pop();
+                    molasses::interpreter_stack stack;
+                    while(true) {
+                        std::cout << "%> ";
+                        std::string contents;
+                        std::getline(std::cin, contents);
+                        molasses::interpret(stack, context, contents);
+                    }
+                } else
+                    throw build_system_error("merge-all expects at least 1 lexed outputs\n");
             } else if(elem == "assemble") {
                 if(not compile_stack.empty() and std::holds_alternative<std::string>(compile_stack.top())) {
                     auto filename = std::get<std::string>(compile_stack.top());

src/molasses/interpreter.cpp

@@ -0,0 +1,30 @@
+#include <span>
+#include "molasses/parser_primitives.h"
+
+namespace molasses {
+    std::tuple<interpreter_stack, generate_context, std::optional<std::shared_ptr<std::runtime_error>>> interpret(interpreter_stack stack, generate_context context, std::string text){
+        auto copy_stack = stack;
+        auto copy_ctx = context;
+
+        try {
+            lexed_output new_lex = lex("%interpreter%", text);
+            context.lexer = concatenate(context.lexer, new_lex);
+            auto count_to_execute = new_lex.symbols.size();
+            auto executable_span = std::span(
+                context.lexer.symbols.begin()+((intptr_t)context.lexer.symbols.size() - (intptr_t)count_to_execute),
+                context.lexer.symbols.end()
+            );
+
+            for(const auto& l : executable_span) {
+                auto token = context.lexer.dictionary[l];
+                if(auto value_i32 = try_parse_int32(token); value_i32) stack.push(value_i32.value());
+                else if(auto value_i64 = try_parse_int64(token); value_i64) stack.push(value_i64.value());
+                else context.parser.lookup_operation(token)->execute(context, stack);
+            }
+        } catch (std::runtime_error& err) {
+            return {copy_stack, copy_ctx, std::make_shared<std::runtime_error>(err)};
+        }
+
+        return {stack, context, std::nullopt};
+    }
+}