ADD: import modules.

doc/grammar.bnf

@@ -4,7 +4,17 @@ EXPR ::=
 | ident
 | CALL
 | LAMBDA
+| FUNDECL
+| VARDECL
+| NS
+| IMPORT
 CALL ::= opar EXPR EXPR* cpar
 LAMBDA ::= opar rarrow opar PARAMS cpar BODY cpar
 PARAMS ::= ident*
 BODY ::= EXPR*
+FUNDECL ::=
+| opar decl opar ident PARAMS cpar BODY cpar
+VARDECL ::= opar decl ident EXPR cpar
+NS ::= ident ns ident
+IMPORT ::= opar import string cpar
+SHORT_IMPORT ::= opar decl import ident string? cpar

examples/fundecl.fk

@@ -0,0 +1,3 @@
+($ (f x y) (* x y))
+
+(assert= 42 (f 6 7))

examples/mod.fk

@@ -0,0 +1,4 @@
+($ a (@ './mod2'))
+
+(assert= 42 a::var)
+(assert= 6 (a::fun 3))

examples/mod2.fk

@@ -0,0 +1,2 @@
+($ var 42)
+($ (fun x) (* 2 x))

libstd/fun.hpp

@@ -4,8 +4,6 @@
 
 namespace fkstd
 {
-  STDRET set(Loc loc, Module& mod, STDARGS args);
-
   STDRET assert_eq(Loc loc, Module& mod, STDARGS args);
   STDRET println(Loc loc, Module& mod, STDARGS args);
 

libstd/lib.cpp

@@ -2,11 +2,8 @@
 #include "fun.hpp"
 #include "macro.hpp"
 
-Module* _module;
-
 extern "C" void lib(Module& mod)
 {
-  _module = &mod;
   mod.register_function("assert=", fkstd::assert_eq);
   mod.register_function("println", fkstd::println);
   mod.register_function("+", fkstd::add_int);
@@ -25,6 +22,5 @@ extern "C" void lib(Module& mod)
   mod.register_macro("!", fkstd::set_addr);
   mod.register_macro("assert-static-fail", fkstd::assert_static_fail);
   mod.register_macro(":", fkstd::block);
-  mod.register_macro("$", fkstd::decl);
   mod.register_macro("if", fkstd::if_macro);
 }

src/Compiler.cpp

@@ -1,10 +1,14 @@
 #include "Compiler.hpp"
+#include "Module.hpp"
 #include "Lambda.hpp"
+#include "commons.hpp"
 
 namespace fk
 {
-  /*explicit*/ Compiler::Compiler(std::shared_ptr<SymTable> sym)
-    : m_sym { sym }
+  /*explicit*/ Compiler::Compiler(Module& mod,
+                                  std::shared_ptr<SymTable> sym)
+    : m_mod { mod }
+    , m_sym { sym }
   {
   }
 
@@ -18,6 +22,24 @@ namespace fk
     m_macros[name] = macro;
   }
 
+  std::shared_ptr<NativeMacro> Compiler::get_macro(std::string const& name)
+  {
+    assert(m_macros.find(name) != std::end(m_macros));
+    return m_macros[name];
+  }
+
+  bool Compiler::has_macro(std::string const& name) const
+  {
+    return m_macros.find(name) != std::end(m_macros);
+  }
+
+  std::unordered_map<std::string, std::shared_ptr<NativeMacro>>
+  Compiler::macros()
+  {
+    return m_macros;
+  }
+
+
   std::shared_ptr<Program> Compiler::compile(std::shared_ptr<Node> node)
   {
     auto prog = std::make_shared<Program>();
@@ -50,6 +72,73 @@ namespace fk
           }
       } break;
 
+      case NODE_VARDECL: {
+        m_addr++;
+
+        std::string ident = node->child(0)->repr();
+        auto rhs = node->child(1);
+
+        push_decl(ident);
+        compile_prog(rhs, prog);
+        pop_decl();
+
+        auto entry = sym()->declare_local(ident,
+                                          m_addr,
+                                          node->loc())
+          .set_node(rhs);
+
+        prog->add(OP_STORE_LOCAL, m_addr);
+
+      } break;
+
+      case NODE_NS: {
+        auto mod = node->child(0);
+        auto var = node->child(1);
+
+        if (has_macro(var->repr()))
+          {
+            return;
+          }
+
+        prog->load_const(std::make_shared<Constant>(TYPE_STRING,
+                                                    var->repr(),
+                                                    node->loc()));
+
+        compile_prog(mod, prog);
+
+        prog->add(OP_LOAD_MOD);
+
+      } break;
+
+      case NODE_IMPORT: {
+        std::string val = node->child(0)->repr();
+
+        std::string path_str = val.substr(1, val.size() - 2);
+        std::filesystem::path path = path_str;
+
+        if (path_str[0] == '.')
+          {
+            if (!path.has_extension())
+              {
+                path += ".fk";
+              }
+
+            auto res = std::make_shared<Constant>
+              (TYPE_STRING, path.string(), node->loc());
+            prog->load_const(res);
+            prog->add(OP_IMPORT);
+          }
+        else
+          {
+            auto res = std::make_shared<Constant>
+              (TYPE_STRING, path.string(),
+               node->loc());
+
+            prog->load_const(res);
+            prog->add(OP_IMPORT_SYS);
+          }
+      } break;
+
       case NODE_LAMBDA: {
         auto params = node->child(0);
         auto body = node->child(1);
@@ -70,7 +159,7 @@ namespace fk
 
         m_sym->declare_local(func_name, params->size(), node->loc());
 
-        Compiler compiler {m_sym};
+        Compiler compiler {m_mod, m_sym};
         for (auto e: m_macros)
           {
             compiler.add_macro(e.first, e.second);
@@ -92,13 +181,24 @@ namespace fk
       case NODE_CALL: {
         std::string ident = node->child(0)->repr();
 
-
         if (auto itr=m_macros.find(ident);
             itr != std::end(m_macros))
           {
             auto macro = itr->second;
             macro->call(*this, node, prog);
           }
+        else if (node->child(0)->type() == NODE_NS
+                 && has_macro(node->child(0)->child(1)->repr()))
+          {
+            std::string name = node->child(0)->child(1)->repr();
+
+            if (auto itr=m_macros.find(name);
+                itr != std::end(m_macros))
+              {
+                auto macro = itr->second;
+                macro->call(*this, node, prog);
+              }
+          }
         else
           {
             for (size_t i=0; i<node->size(); i++)
@@ -106,8 +206,10 @@ namespace fk
                 compile_prog(node->child(i), prog);
               }
 
+
             if (node->child(0)->type() == NODE_LAMBDA
-                || node->child(0)->type() == NODE_CALL)
+                || node->child(0)->type() == NODE_CALL
+                || node->child(0)->type() == NODE_NS)
               {
                 prog->add(OP_CALL_REF, node->size() - 1);
               }
@@ -137,7 +239,7 @@ namespace fk
                   }
                 else
                   {
-                    prog->add(OP_CALL_NATIVE, node->size() - 1);
+                    prog->add(OP_CALL_REF, node->size() - 1);
                   }
               }
           }

src/Compiler.hpp

@@ -15,10 +15,12 @@ namespace fk
     size_t arity;
   };
 
+  class Module;
+
   class Compiler
   {
   public:
-    explicit Compiler(std::shared_ptr<SymTable> sym);
+    explicit Compiler(Module& mod, std::shared_ptr<SymTable> sym);
     virtual ~Compiler();
 
     std::shared_ptr<SymTable> sym() const { return m_sym; }
@@ -26,6 +28,14 @@ namespace fk
     void add_macro(std::string const& name,
                    std::shared_ptr<NativeMacro> macro);
 
+    std::shared_ptr<NativeMacro> get_macro(std::string const& name);
+
+    bool has_macro(std::string const& name) const;
+
+    std::unordered_map<std::string, std::shared_ptr<NativeMacro>>
+    macros();
+
+
     std::shared_ptr<Program> compile(std::shared_ptr<Node> node);
 
     void compile_prog(std::shared_ptr<Node> node,
@@ -35,6 +45,8 @@ namespace fk
     void pop_decl();
 
   private:
+    Module& m_mod;
+    addr_t m_addr = 0;
     std::shared_ptr<SymTable> m_sym;
     std::vector<std::string> m_decl_stack;
     std::unordered_map<std::string,

src/Lexer.cpp

@@ -7,6 +7,9 @@ namespace fk
     : m_loc { loc }
   {
     std::vector<std::tuple<NodeType, std::string, bool>> text = {
+      {NODE_IMPORT, "@", false},
+      {NODE_DECL, "$", false},
+      {NODE_NS, "::", false},
       {NODE_RARROW, "->", false},
       {NODE_OPAR, "(", false},
       {NODE_CPAR, ")", false},
@@ -255,8 +258,16 @@ namespace fk
     std::string repr;
 
     while (cursor < m_source.size()
-           && !is_sep(cursor))
+           && !is_sep(cursor)
+           && m_source[cursor])
       {
+        if (cursor + 1 < m_source.size()
+            && m_source[cursor] == ':'
+            && m_source[cursor + 1] == ':')
+          {
+            break;
+          }
+
         repr += m_source[cursor];
         cursor++;
       }

src/Module.cpp

@@ -15,11 +15,27 @@ namespace fk
   {
   }
 
+  std::shared_ptr<Module> Module::get_mod(std::string const& name)
+  {
+    assert(m_native_modules.find(name) != std::end(m_native_modules));
+    return m_native_modules[name];
+  }
+
   void Module::build()
   {
     import_std();
     m_source = load_sources();
     m_ast = m_parser->parse(m_source);
+
+    // Add natives macros before compilation
+    for (auto mod: m_native_modules)
+      {
+        for (auto e: mod.second->compiler()->macros())
+          {
+            m_compiler->add_macro(e.first, e.second);
+          }
+      }
+
     m_program = m_compiler->compile(m_ast);
 
     m_vm->mount(m_program);
@@ -43,6 +59,14 @@ namespace fk
     f(*this);
   }
 
+  std::shared_ptr<Module> Module::register_module(std::string const& name)
+  {
+    auto mod = std::make_shared<Module>(name);
+    m_native_modules[name] = mod;
+
+    return mod;
+  }
+
   void Module::register_function(std::string const& name, native_t native)
   {
     auto fun = std::make_shared<NativeFunction>(native);

src/Module.hpp

@@ -18,15 +18,20 @@ namespace fk
     explicit Module(std::filesystem::path source_path);
     virtual ~Module();
 
+    std::shared_ptr<Compiler> compiler() const { return m_compiler; }
     std::shared_ptr<Program> program() const { return m_program; }
     std::shared_ptr<SymTable> sym() const { return m_sym; }
     std::shared_ptr<VM> vm() const { return m_vm; }
 
+    std::shared_ptr<Module> get_mod(std::string const& name);
+
     void build();
 
     void import_std();
     void import_library(std::filesystem::path lib_path);
 
+    std::shared_ptr<Module> register_module(std::string const& name);
+
     void register_function(std::string const& name, native_t native);
     void register_macro(std::string const& name, macro_t macro);
 
@@ -37,10 +42,13 @@ namespace fk
     std::shared_ptr<Lexer> m_lexer = std::make_shared<Lexer>(m_loc);
     std::shared_ptr<Parser> m_parser = std::make_shared<Parser>(*m_lexer);
     std::shared_ptr<SymTable> m_sym = std::make_shared<SymTable>();
-    std::shared_ptr<Compiler> m_compiler = std::make_shared<Compiler>(m_sym);
+    std::shared_ptr<Compiler> m_compiler = std::make_shared<Compiler>(*this,
+                                                                      m_sym);
     std::shared_ptr<Node> m_ast;
     std::shared_ptr<VM> m_vm = std::make_shared<VM>(*this);
     std::shared_ptr<Program> m_program = std::make_shared<Program>();
+    std::unordered_map<std::string, std::shared_ptr<Module>> m_native_modules;
+
     std::string load_sources();
   };
 }

src/Node.hpp

@@ -7,7 +7,8 @@
 #define NODE_TYPES(G) \
   G(NODE_MODULE), G(NODE_INT), G(NODE_FLOAT), G(NODE_BOOL), G(NODE_STRING),\
     G(NODE_IDENT), G(NODE_OPAR), G(NODE_CPAR), G(NODE_CALL), G(NODE_LAMBDA),\
-    G(NODE_RARROW), G(NODE_PARAMS), G(NODE_BODY)
+    G(NODE_RARROW), G(NODE_PARAMS), G(NODE_BODY), G(NODE_NS), G(NODE_IMPORT),\
+    G(NODE_VARDECL), G(NODE_DECL)
 
 namespace fk
 {

src/Parser.cpp

@@ -1,6 +1,7 @@
 #include "Parser.hpp"
 #include "src/Loc.hpp"
 #include "src/Node.hpp"
+#include <memory>
 
 namespace fk
 {
@@ -49,6 +50,24 @@ namespace fk
 
   std::shared_ptr<Node> Parser::parse_expr()
   {
+
+    if (type_all({NODE_IDENT, NODE_NS}))
+      {
+        return parse_ns();
+      }
+
+    if (type_all({NODE_OPAR, NODE_DECL, NODE_IMPORT,
+          NODE_IDENT, NODE_STRING, NODE_CPAR})
+        || type_all({NODE_OPAR, NODE_DECL, NODE_IMPORT,
+            NODE_IDENT, NODE_CPAR}))
+      {
+        return parse_short_import();
+      }
+    else if (type_all({NODE_OPAR, NODE_IMPORT}))
+      {
+        return parse_import();
+      }
+
     if (type_any({
           NODE_INT,
           NODE_FLOAT,
@@ -59,7 +78,15 @@ namespace fk
         return consume();
       }
 
-    if (type_all({NODE_OPAR, NODE_RARROW}))
+    if (type_all({NODE_OPAR, NODE_DECL, NODE_OPAR, NODE_IDENT}))
+      {
+        return parse_fundecl();
+      }
+    else if (type_all({NODE_OPAR, NODE_DECL}))
+      {
+        return parse_vardecl();
+      }
+    else if (type_all({NODE_OPAR, NODE_RARROW}))
       {
         return parse_lambda();
       }
@@ -134,6 +161,94 @@ namespace fk
     return node;
   }
 
+  std::shared_ptr<Node> Parser::parse_fundecl()
+  {
+    consume(NODE_OPAR);
+    auto dollar = consume(NODE_DECL);
+
+    consume(NODE_OPAR);
+    auto ident = consume(NODE_IDENT);
+    auto params = parse_params();
+    consume(NODE_CPAR);
+
+    auto body = parse_body();
+    consume(NODE_CPAR);
+
+    auto res = make_node(NODE_VARDECL);
+    res->add_child(ident);
+
+    auto lambda = make_node(NODE_LAMBDA);
+    lambda->add_child(params);
+    lambda->add_child(body);
+    res->add_child(lambda);
+
+    return res;
+  }
+
+  std::shared_ptr<Node> Parser::parse_vardecl()
+  {
+    auto node = make_node(NODE_VARDECL);
+    consume(NODE_OPAR);
+    consume(NODE_DECL);
+
+    node->add_child(consume(NODE_IDENT));
+    node->add_child(parse_expr());
+    consume(NODE_CPAR);
+
+    return node;
+  }
+
+  std::shared_ptr<Node> Parser::parse_ns()
+  {
+    auto ns = make_node(NODE_NS);
+    ns->add_child(consume(NODE_IDENT));
+    consume(NODE_NS);
+    ns->add_child(consume(NODE_IDENT));
+    return ns;
+  }
+
+  std::shared_ptr<Node> Parser::parse_import()
+  {
+    consume(NODE_OPAR);
+    auto node = consume(NODE_IMPORT);
+    node->add_child(consume(NODE_STRING));
+    consume(NODE_CPAR);
+
+    return node;
+  }
+
+  std::shared_ptr<Node> Parser::parse_short_import()
+  {
+    consume(NODE_OPAR);
+    consume(NODE_DECL);
+
+    auto node_import = consume(NODE_IMPORT);
+    auto ident = consume(NODE_IDENT);
+    std::shared_ptr<Node> str;
+
+    if (type_is(NODE_CPAR))
+      {
+        str = std::make_shared<Node>(NODE_STRING,
+                                     "'" + ident->repr() + "'",
+                                     ident->loc());
+      }
+    else
+      {
+        str = consume(NODE_STRING);
+      }
+
+    consume(NODE_CPAR);
+
+    auto vardecl = make_node(NODE_VARDECL);
+    vardecl->add_child(ident);
+
+    auto imp = make_node(NODE_IMPORT);
+    imp->add_child(str);
+    vardecl->add_child(imp);
+
+    return vardecl;
+  }
+
   std::shared_ptr<Node> Parser::make_node(NodeType type)
   {
     return std::make_shared<Node>(type, "", loc());

src/Parser.hpp

@@ -26,6 +26,11 @@ namespace fk
     std::shared_ptr<Node> parse_lambda();
     std::shared_ptr<Node> parse_params();
     std::shared_ptr<Node> parse_body();
+    std::shared_ptr<Node> parse_fundecl();
+    std::shared_ptr<Node> parse_vardecl();
+    std::shared_ptr<Node> parse_ns();
+    std::shared_ptr<Node> parse_import();
+    std::shared_ptr<Node> parse_short_import();
 
     std::shared_ptr<Node> make_node(NodeType type);
     Loc loc() const;

src/VM.cpp

@@ -1,5 +1,7 @@
 #include "VM.hpp"
-#include "src/opcodes.hpp"
+#include "opcodes.hpp"
+#include "Module.hpp"
+#include "src/NativeFunction.hpp"
 #include <memory>
 
 namespace fk
@@ -29,6 +31,103 @@ namespace fk
 
         switch (instr.opcode)
           {
+          case OP_IMPORT: {
+            auto path_val = frame().program->get_const(pop());
+            std::filesystem::path path =
+              std::get<std::string>(path_val->value());
+
+            auto mod = std::make_shared<Module>(path);
+            mod->build();
+
+            addr_t addr = store_global(mod);
+            auto res = std::make_shared<Constant>(TYPE_REF, addr,
+                                                  path_val->loc());
+            push(frame().program->add(res));
+            m_pc++;
+
+          } break;
+
+          case OP_IMPORT_SYS: {
+            auto path_val = frame().program->get_const(pop());
+
+            std::filesystem::path path =
+              std::get<std::string>(path_val->value());
+
+            auto mod = m_mod.get_mod(path);
+
+            addr_t addr = store_global(mod);
+            auto res = std::make_shared<Constant>(TYPE_REF, addr,
+                                                  path_val->loc());
+            push(frame().program->add(res));
+
+            m_pc++;
+          } break;
+
+          case OP_LOAD_MOD: {
+            addr_t mod_addr = pop();
+            auto mod_val = frame().program->get_const(mod_addr);
+            size_t mod_ref =
+              std::get<size_t>(mod_val->value());
+
+            auto mod = std::get<std::shared_ptr<Module>>
+              (load_global(mod_ref));
+
+            addr_t ident_addr = pop();
+            auto ident =
+              std::get<std::string>(frame().program->
+                                    get_const(ident_addr)->value());
+
+            auto entry = mod->sym()->find_global(ident);
+
+            if (mod->compiler()->has_macro(ident))
+              {
+                m_pc++;
+                break;
+              }
+
+            if (!entry)
+              {
+                std::cerr << "cannot load " << ident << std::endl;
+                abort();
+              }
+
+            if (entry->is_global())
+              {
+                auto fun = std::get<std::shared_ptr<NativeFunction>>
+                  (mod->vm()->m_globals[entry->addr()]);
+                size_t addr = store_global(fun);
+
+                auto ref = std::make_shared<Constant>(TYPE_REF,
+                                                      addr,
+                                                      Loc {""});
+                push(frame().program->add(ref));
+                m_pc++;
+                break;
+              }
+
+            auto var = mod->vm()->load_local(entry->addr());
+
+            if (var->type() == TYPE_REF)
+              {
+                auto value = mod->vm()->load_global
+                  (std::get<size_t>(var->value()));
+
+                size_t new_addr = store_global(value);
+
+                push(frame().program->add
+                     (std::make_shared<Constant>(TYPE_REF,
+                                                 new_addr,
+                                                 mod_val->loc())));
+              }
+            else
+              {
+                auto value = mod->vm()->load_local(entry->addr());
+                push(frame().program->add(value));
+              }
+
+            m_pc++;
+          } break;
+
           case OP_STORE_CLOSURE: {
             auto val = frame().program->get_const(top());
             auto lambda = frame().lambda;
@@ -135,6 +234,19 @@ namespace fk
 
             addr_t ref = std::get<addr_t>(ref_val->value());
 
+            auto val = load_global(ref);
+
+            if (std::get_if<std::shared_ptr<NativeFunction>>(&val))
+            {
+              auto fun = std::get<std::shared_ptr<NativeFunction>>
+                (load_global(ref));
+
+              push(frame().program->add(fun->call(ref_val->loc(),
+                                                  m_mod, args)));
+              m_pc++;
+              break;
+            }
+
             auto lambda = std::get<std::shared_ptr<Lambda>>(load_global(ref));
 
 
@@ -159,36 +271,6 @@ namespace fk
             m_pc = 0;
           } break;
 
-          case OP_CALL_NATIVE: {
-            std::vector<std::shared_ptr<Constant>> args;
-
-            for (size_t i=0; i<instr.param; i++)
-              {
-                addr_t addr = pop();
-
-                args.insert(std::begin(args),
-                            frame().program->get_const(addr));
-              }
-
-            auto ref_val = frame().program->get_const(pop());
-
-            Loc loc = ref_val->loc();
-
-            if (instr.param > 0)
-              {
-                loc = args.front()->loc();
-              }
-
-            auto ref = std::get<size_t>(ref_val->value());
-
-            auto fun = std::get<std::shared_ptr<NativeFunction>>
-              (load_global(ref));
-
-            push(frame().program->add(fun->call(loc, m_mod, args)));
-
-            m_pc++;
-          } break;
-
           case OP_LOAD_LOCAL: {
             auto value = frame().locals[instr.param];
 

src/VM.hpp

@@ -9,6 +9,7 @@
 namespace fk
 {
   using global_t = std::variant<std::shared_ptr<NativeFunction>,
+                                std::shared_ptr<Module>,
                                 std::shared_ptr<Lambda>
                                 >;
 

src/opcodes.hpp

@@ -1,10 +1,11 @@
 #ifndef fk_OPCODES_HPP
 #define fk_OPCODES_HPP
 
-#define OPCODES(G) G(OP_LOAD_CONST), G(OP_POP), G(OP_CALL_NATIVE), \
+#define OPCODES(G) G(OP_LOAD_CONST), G(OP_POP),                    \
     G(OP_LOAD_GLOBAL), G(OP_LOAD_LOCAL), G(OP_STORE_LOCAL),        \
     G(OP_MAKE_FUNCTION), G(OP_CALL_REF), G(OP_RET), G(OP_BNE),     \
-    G(OP_BR), G(OP_LOAD_CLOSURE), G(OP_STORE_CLOSURE)
+    G(OP_BR), G(OP_LOAD_CLOSURE), G(OP_STORE_CLOSURE),             \
+    G(OP_LOAD_MOD), G(OP_IMPORT), G(OP_IMPORT_SYS)
 
 #include "commons.hpp"
 

tests/Lexer.cpp

@@ -97,3 +97,15 @@ TEST_CASE_METHOD(LexerTest, "Lexer_lambda")
   test_next("CPAR");
   test_end();
 }
+
+TEST_CASE_METHOD(LexerTest, "Lexer_namespace")
+{
+  m_lexer.scan(" (a::x 3) ");
+  test_next("OPAR");
+  test_next("IDENT[a]");
+  test_next("NS");
+  test_next("IDENT[x]");
+  test_next("INT[3]");
+  test_next("CPAR");
+  test_end();
+}

tests/Parser.cpp

@@ -36,6 +36,12 @@ TEST_CASE_METHOD(ParserTest, "Parser_call")
              " (bim 2 '3' false) ");
 }
 
+TEST_CASE_METHOD(ParserTest, "Parser_vardecl")
+{
+  test_parse("MODULE(VARDECL(IDENT[hello],INT[3]))",
+             " ($ hello 3) ");
+}
+
 TEST_CASE_METHOD(ParserTest, "Parser_lambda")
 {
   test_parse("MODULE(LAMBDA(PARAMS,BODY))",
@@ -47,3 +53,31 @@ TEST_CASE_METHOD(ParserTest, "Parser_lambda")
   test_parse("MODULE(LAMBDA(PARAMS(IDENT[x],IDENT[y]),BODY(INT[7])))",
              " (-> (x y) 7) ");
 }
+
+TEST_CASE_METHOD(ParserTest, "Parser_fundecl")
+{
+  test_parse("MODULE(VARDECL(IDENT[f],"
+             "LAMBDA(PARAMS(IDENT[x]),BODY(INT[7]))))",
+             " ($ (f x) 7)  ");
+}
+
+TEST_CASE_METHOD(ParserTest, "Parser_namespace")
+{
+  test_parse("MODULE(CALL(NS(IDENT[x],IDENT[y]),IDENT[z]))",
+             " (x::y z) ");
+}
+
+TEST_CASE_METHOD(ParserTest, "Parser_import")
+{
+  test_parse("MODULE(VARDECL(IDENT[x],IMPORT(STRING['y'])))",
+             " ($ x (@ 'y') )");
+
+  test_parse("MODULE(VARDECL(IDENT[x],IMPORT(STRING['y'])))",
+             " ($ @x 'y' )");
+
+  test_parse("MODULE(VARDECL(IDENT[bim],IMPORT(STRING['bam'])))",
+             " ($ @bim 'bam' )");
+
+  test_parse("MODULE(VARDECL(IDENT[example],IMPORT(STRING['example'])))",
+             " ($ @example )");
+}