Merge pull request #22 from ThakeeNathees/chain-call-test

chain call implemented

cli/TODO.txt

@@ -1,8 +1,14 @@
 
 // To implement.
 
+
+[ ] Single header for embedding.
+[ ] Add a make file/and more? (not every one has scons).
+
+[ ] Resolve function name (called before defined).
 [ ] Relative file import.
 [ ] Remove resolve path for the root module.
+[ ] Global variable names (also update dumpFunctionCode after).
 
 [ ] Implement fiber from script body and vm run fibers (not scripts).
     Then remove vm's root script.
@@ -12,8 +18,8 @@
 [ ] Var handler implement.
 [ ] Make it possible to override function names.
 [ ] Hex, binary literals and floats like ".5".
+[ ] Function docstring property.
 [ ] Union tagging alter in var.
-[ ] Add a make file/and more? (not every one has scons).
 [ ] (future) add structs and maybe enums.
 
 // Add more.

cli/main.c

@@ -75,10 +75,10 @@ pkStringResult loadScript(PKVM* vm, const char* path) {
 int main(int argc, char** argv) {
 
   const char* notice =
-    "MiniScript " PK_VERSION_STRING " (https://github.com/ThakeeNathees/miniscript/)\n"
+    "PocketLang " PK_VERSION_STRING " (https://github.com/ThakeeNathees/pocketlang/)\n"
     "Copyright(c) 2020 - 2021 ThakeeNathees.\n"
     "Free and open source software under the terms of the MIT license.\n";
-  const char* help = "Usage: miniscript <source_path>\n";
+  const char* help = "Usage: pocketlang <source_path>\n";
 
   if (argc < 2) {
     printf("%s\n%s", notice, help);

docs/try/compile.py

@@ -12,7 +12,7 @@ SRC_DIR     = '../../src/'
 JS_API_PATH = './io_api.js'
 TARGET_DIR  = '../static/'
 TARGET_NAME = 'pocketlang.html'
-JS_SCRIPT   = 'try_now.js'
+PAGE_SCRIPT = 'try_now.js'
 
 def main():
   sources = ' '.join(collect_source_files())
@@ -27,7 +27,7 @@ def main():
   print(cmd)
   os.system(cmd)
   
-  shutil.copyfile(JS_SCRIPT, join(TARGET_DIR,JS_SCRIPT))
+  shutil.copyfile(PAGE_SCRIPT, join(TARGET_DIR,PAGE_SCRIPT))
   os.remove(output) ## Not using the generated html file.
   
   
@@ -36,16 +36,11 @@ def fix_path(path):
 
 def collect_source_files():
   sources = []
-  
+  for file in os.listdir(SRC_DIR):
-  def add_all(root, sources):
+    if not os.path.isfile(join(SRC_DIR, file)): continue
-    for file in os.listdir(root):
-      if not os.path.isfile(join(root, file)): continue
     if file.endswith('.c'):
-        source = fix_path(join(root, file))
+      source = fix_path(join(SRC_DIR, file))
       sources.append(source)
-
-  add_all(SRC_DIR, sources)
-  add_all(join(SRC_DIR, 'buffers/'), sources)
   return sources
 
 if __name__ == '__main__':

src/buffers.h

@@ -7,7 +7,7 @@
 #define BUFFERS_TEMPLATE_H
 
 #include "common.h"
-#include "pocketlang.h"
+#include "include/pocketlang.h"
 
 #define DECLARE_BUFFER(M__NAME, M__NAME_L, M__TYPE)                           \
   typedef struct {                                                            \

src/compiler.c

@@ -62,6 +62,7 @@ typedef enum {
   TK_AMP,        // &
   TK_PIPE,       // |
   TK_CARET,      // ^
+  TK_ARROW,      // ->
 
   TK_PLUS,       // +
   TK_MINUS,      // -
@@ -221,6 +222,7 @@ typedef enum {
   PREC_TERM,          // + -
   PREC_FACTOR,        // * / %
   PREC_UNARY,         // - ! ~
+  PREC_CHAIN_CALL,    // ->
   PREC_CALL,          // ()
   PREC_SUBSCRIPT,     // []
   PREC_ATTRIB,        // .index
@@ -623,7 +625,13 @@ static void lexToken(Parser* parser) {
         return;
 
       case '-':
-        setNextTwoCharToken(parser, '=', TK_MINUS, TK_MINUSEQ);
+        if (matchChar(parser, '=')) {
+          setNextToken(parser, TK_MINUSEQ);  // '-='
+        } else if (matchChar(parser, '>')) {
+          setNextToken(parser, TK_ARROW);    // '->'
+        } else {
+          setNextToken(parser, TK_MINUS);    // '-'
+        }
         return;
 
       case '*':
@@ -892,6 +900,7 @@ static void exprName(Compiler* compiler, bool can_assign);
 static void exprOr(Compiler* compiler, bool can_assign);
 static void exprAnd(Compiler* compiler, bool can_assign);
 
+static void exprChainCall(Compiler* compiler, bool can_assign);
 static void exprBinaryOp(Compiler* compiler, bool can_assign);
 static void exprUnaryOp(Compiler* compiler, bool can_assign);
 
@@ -930,6 +939,7 @@ GrammarRule rules[] = {  // Prefix       Infix             Infix Precedence
   /* TK_AMP        */ { NULL,          exprBinaryOp,     PREC_BITWISE_AND },
   /* TK_PIPE       */ { NULL,          exprBinaryOp,     PREC_BITWISE_OR },
   /* TK_CARET      */ { NULL,          exprBinaryOp,     PREC_BITWISE_XOR },
+  /* TK_ARROW      */ { NULL,          exprChainCall,    PREC_CHAIN_CALL },
   /* TK_PLUS       */ { NULL,          exprBinaryOp,     PREC_TERM },
   /* TK_MINUS      */ { exprUnaryOp,   exprBinaryOp,     PREC_TERM },
   /* TK_STAR       */ { NULL,          exprBinaryOp,     PREC_FACTOR },
@@ -1016,7 +1026,7 @@ static void emitPushVariable(Compiler* compiler, int index, bool global) {
 static void exprLiteral(Compiler* compiler, bool can_assign) {
   Token* value = &compiler->parser.previous;
   int index = compilerAddConstant(compiler, value->value);
-  emitOpcode(compiler, OP_CONSTANT);
+  emitOpcode(compiler, OP_PUSH_CONSTANT);
   emitShort(compiler, index);
 }
 
@@ -1161,6 +1171,30 @@ void exprAnd(Compiler* compiler, bool can_assign) {
   patchJump(compiler, end_offset);
 }
 
+static void exprChainCall(Compiler* compiler, bool can_assign) {
+  skipNewLines(&compiler->parser);
+  parsePrecedence(compiler, (Precedence)(PREC_CHAIN_CALL + 1));
+  emitOpcode(compiler, OP_SWAP); // Swap the data with the function.
+
+  int argc = 1; // The initial data.
+
+  if (match(&compiler->parser, TK_LBRACE)) {
+    if (!match(&compiler->parser, TK_RBRACE)) {
+      do {
+        skipNewLines(&compiler->parser);
+        compileExpression(compiler);
+        skipNewLines(&compiler->parser);
+        argc++;
+      } while (match(&compiler->parser, TK_COMMA));
+      consume(&compiler->parser, TK_RBRACE, "Expected '}' after chain call"
+                                            "parameter list.");
+    }
+  }
+
+  emitOpcode(compiler, OP_CALL);
+  emitShort(compiler, argc);
+}
+
 static void exprBinaryOp(Compiler* compiler, bool can_assign) {
   TokenType op = compiler->parser.previous.type;
   skipNewLines(&compiler->parser);
@@ -1490,7 +1524,7 @@ static void emitOpcode(Compiler* compiler, Opcode opcode) {
 // make one.
 static void emitConstant(Compiler* compiler, Var value) {
   int index = compilerAddConstant(compiler, value);
-  emitOpcode(compiler, OP_CONSTANT);
+  emitOpcode(compiler, OP_PUSH_CONSTANT);
   emitShort(compiler, index);
 }
 
@@ -1546,7 +1580,7 @@ static int compileFunction(Compiler* compiler, FuncType fn_type) {
     }
 
   } else {
-    name = "[FunctionLiteral]";
+    name = "$(LiteralFn)";
     name_length = (int)strlen(name);
   }
   
@@ -1610,7 +1644,7 @@ static int compileFunction(Compiler* compiler, FuncType fn_type) {
   compilerExitBlock(compiler); // Parameter depth.
 
 #if DEBUG_DUMP_COMPILED_CODE
-  dumpInstructions(compiler->vm, compiler->func->ptr);
+  dumpFunctionCode(compiler->vm, compiler->func->ptr);
 #endif
   compiler->func = compiler->func->outer_func;
 
@@ -2020,7 +2054,7 @@ bool compile(PKVM* vm, Script* script, const char* source) {
   vm->compiler = NULL;
 
 #if DEBUG_DUMP_COMPILED_CODE
-  dumpInstructions(vm, script->body);
+  dumpFunctionCode(vm, script->body);
 #endif
 
   // Return true if success.

src/core.c

@@ -5,9 +5,11 @@
 
 #include "core.h"
 
+#include <ctype.h>
 #include <math.h>
 #include <time.h>
 
+#include "utils.h"
 #include "var.h"
 #include "vm.h"
 
@@ -84,6 +86,20 @@ static inline bool validateIndex(PKVM* vm, int32_t index, int32_t size,
   return true;
 }
 
+// Check if [var] is string for argument at [arg_ind]. If not set error and
+// return false.
+static bool validateArgString(PKVM* vm, Var var, String** value, int arg_ind) {
+  if (!IS_OBJ(var) || AS_OBJ(var)->type != OBJ_STRING) {
+    String* str_arg = toString(vm, VAR_NUM((double)arg_ind), false);
+    vmPushTempRef(vm, &str_arg->_super);
+    vm->fiber->error = stringFormat(vm, "Expected a string at argument @.",
+                                    str_arg, false);
+    vmPopTempRef(vm);
+  }
+  *value = (String*)AS_OBJ(var);
+  return true;
+}
+
 /*****************************************************************************/
 /* BUILTIN FUNCTIONS API                                                     */
 /*****************************************************************************/
@@ -91,7 +107,7 @@ static inline bool validateIndex(PKVM* vm, int32_t index, int32_t size,
 // Argument getter (1 based).
 #define ARG(n) vm->fiber->ret[n]
 
-// Convinent macro
+// Convinent macros.
 #define ARG1 ARG(1)
 #define ARG2 ARG(2)
 #define ARG3 ARG(3)
@@ -216,6 +232,49 @@ void corePrint(PKVM* vm) {
   vm->config.write_fn(vm, "\n");
 }
 
+// string functions
+// ----------------
+
+void coreStrLower(PKVM* vm) {
+  String* str;
+  if (!validateArgString(vm, ARG1, &str, 1)) return;
+
+  String* result = newStringLength(vm, str->data, str->length);
+  char* data = result->data;
+  for (; *data; ++data) *data = tolower(*data);
+  // Since the string is modified re-hash it.
+  result->hash = utilHashString(result->data);
+
+  RET(VAR_OBJ(&result->_super));
+}
+
+void coreStrUpper(PKVM* vm) {
+  String* str;
+  if (!validateArgString(vm, ARG1, &str, 1)) return;
+
+  String* result = newStringLength(vm, str->data, str->length);
+  char* data = result->data;
+  for (; *data; ++data) *data = toupper(*data);
+  // Since the string is modified re-hash it.
+  result->hash = utilHashString(result->data);
+  
+  RET(VAR_OBJ(&result->_super));
+}
+
+void coreStrStrip(PKVM* vm) {
+  String* str;
+  if (!validateArgString(vm, ARG1, &str, 1)) return;
+
+  const char* start = str->data;
+  while (*start && isspace(*start)) start++;
+  if (*start == '\0') RET(VAR_OBJ(&newStringLength(vm, NULL, 0)->_super));
+
+  const char* end = str->data + str->length - 1;
+  while (isspace(*end)) end--;
+
+  RET(VAR_OBJ(&newStringLength(vm, start, end - start + 1)->_super));
+}
+
 /*****************************************************************************/
 /* CORE LIBRARY METHODS                                                      */
 /*****************************************************************************/
@@ -303,6 +362,11 @@ void initializeCore(PKVM* vm) {
   INITALIZE_BUILTIN_FN("to_string",   coreToString,   1);
   INITALIZE_BUILTIN_FN("print",       corePrint,     -1);
 
+  // string functions.
+  INITALIZE_BUILTIN_FN("str_lower",   coreStrLower,   1);
+  INITALIZE_BUILTIN_FN("str_upper",   coreStrUpper,   1);
+  INITALIZE_BUILTIN_FN("str_strip",   coreStrStrip,   1);
+
   // Make STD scripts.
   Script* std;  // A temporary pointer to the current std script.
   Function* fn; // A temporary pointer to the allocated function function.
@@ -671,12 +735,15 @@ Var varGetSubscript(PKVM* vm, Var on, Var key) {
     {
       Var value = mapGet((Map*)obj, key);
       if (IS_UNDEF(value)) {
+
         String* key_str = toString(vm, key, true);
-
         vmPushTempRef(vm, &key_str->_super);
-        vm->fiber->error = stringFormat(vm, "Key (@) not exists", key_str);
+        if (IS_OBJ(key) && !isObjectHashable(AS_OBJ(key)->type)) {
+          vm->fiber->error = stringFormat(vm, "Invalid key '@'.", key_str);
+        } else {
+          vm->fiber->error = stringFormat(vm, "Key '@' not exists", key_str);
+        }
         vmPopTempRef(vm);
-
         return VAR_NULL;
       }
       return value;

src/debug.c

@@ -16,7 +16,6 @@ static const char* op_name[] = {
   NULL,
 };
 
-
 static void _dumpValue(PKVM* vm, Var value, bool recursive) {
   if (IS_NULL(value)) {
     printf("null");
@@ -53,8 +52,22 @@ static void _dumpValue(PKVM* vm, Var value, bool recursive) {
     }
 
     case OBJ_MAP:
-      TODO;
+    {
+      Map* map = (Map*)obj;
+      if (recursive) {
+        printf("{...}");
+      } else {
+        printf("{");
+        for (uint32_t i = 0; i < map->count; i++) {
+          if (i != 0) printf(", ");
+          _dumpValue(vm, map->entries[i].key, true);
+          printf(":");
+          _dumpValue(vm, map->entries[i].value, true);
+        }
+        printf("}");
+      }
       return;
+    }
 
     case OBJ_RANGE:
     {
@@ -64,10 +77,11 @@ static void _dumpValue(PKVM* vm, Var value, bool recursive) {
     }
 
     case OBJ_SCRIPT:
-      printf("[Script:%p]", obj);
+      printf("[Script:%s]", ((Script*)obj)->name->data);
       return;
+
     case OBJ_FUNC:
-      printf("[Fn:%p]", obj);
+      printf("[Fn:%s]", ((Function*)obj)->name);
       return;
 
     case OBJ_FIBER:
@@ -84,8 +98,7 @@ void dumpValue(PKVM* vm, Var value) {
   _dumpValue(vm, value, false);
 }
 
-void dumpInstructions(PKVM* vm, Function* func) {  
+void dumpFunctionCode(PKVM* vm, Function* func) {
-
 
   uint32_t i = 0;
   uint8_t* opcodes = func->fn->opcodes.data;
@@ -116,7 +129,7 @@ void dumpInstructions(PKVM* vm, Function* func) {
 
     Opcode op = (Opcode)func->fn->opcodes.data[i++];
     switch (op) {
-      case OP_CONSTANT:
+      case OP_PUSH_CONSTANT:
       {
         int index = READ_SHORT();
         printf("%5d ", index);
@@ -131,6 +144,7 @@ void dumpInstructions(PKVM* vm, Function* func) {
       case OP_PUSH_SELF:
       case OP_PUSH_TRUE:
       case OP_PUSH_FALSE:
+      case OP_SWAP:
         NO_ARGS();
         break;
 
@@ -174,9 +188,23 @@ void dumpInstructions(PKVM* vm, Function* func) {
 
       case OP_PUSH_GLOBAL:
       case OP_STORE_GLOBAL:
-      case OP_PUSH_FN:
+      {
-        SHORT_ARG();
+        int index = READ_SHORT();
+        // TODO: name hasn't implemented yet.
+        //int name_index = func->owner->global_names.data[index];
+        //String* name = func->owner->names.data[name_index];
+        printf("%5d '%s'\n", index, "todo:name"/*name->data*/);
         break;
+      }
+
+      case OP_PUSH_FN:
+      {
+        int fn_index = READ_SHORT();
+        int name_index = func->owner->function_names.data[fn_index];
+        String* name = func->owner->names.data[name_index];
+        printf("%5d [Fn:%s]\n", fn_index, name->data);
+        break;
+      }
 
       case OP_PUSH_BUILTIN_FN:
       {
@@ -185,9 +213,14 @@ void dumpInstructions(PKVM* vm, Function* func) {
         break;
       }
 
-
       case OP_POP:    NO_ARGS(); break;
-      case OP_IMPORT: NO_ARGS(); break;
+      case OP_IMPORT:
+      {
+        int index = READ_SHORT();
+        String* name = func->owner->names.data[index];
+        printf("%5d '%s'\n", index, name->data);
+        break;
+      }
 
       case OP_CALL:
         printf("%5d (argc)\n", READ_SHORT());
@@ -237,8 +270,6 @@ void dumpInstructions(PKVM* vm, Function* func) {
       case OP_BIT_XOR:
       case OP_BIT_LSHIFT:
       case OP_BIT_RSHIFT:
-      case OP_AND:
-      case OP_OR:
       case OP_EQEQ:
       case OP_NOTEQ:
       case OP_LT:
@@ -258,19 +289,18 @@ void dumpInstructions(PKVM* vm, Function* func) {
   }
 }
 
-void reportStackTrace(PKVM* vm) {
+void dumpStackFrame(PKVM* vm) {
-  if (vm->config.error_fn == NULL) return;
-
   Fiber* fiber = vm->fiber;
+  int frame_ind = fiber->frame_count - 1;
+  ASSERT(frame_ind >= 0, OOPS);
+  CallFrame* frame = &fiber->frames[frame_ind];
+  Var* sp = fiber->sp - 1;
 
-  vm->config.error_fn(vm, PK_ERROR_RUNTIME, NULL, -1, fiber->error->data);
+  printf("Frame: %d.\n", frame_ind);
-
+  for (; sp >= frame->rbp; sp--) {
-  for (int i = fiber->frame_count - 1; i >= 0; i--) {
+    printf("       ");
-    CallFrame* frame = &fiber->frames[i];
+    dumpValue(vm, *sp);
-    Function* fn = frame->fn;
+    printf("\n");
-    ASSERT(!fn->is_native, OOPS);
-    int line = fn->fn->oplines.data[frame->ip - fn->fn->opcodes.data - 1];
-    vm->config.error_fn(vm, PK_ERROR_STACKTRACE, fn->owner->name->data, line, fn->name);
   }
 }
 

src/debug.h

@@ -12,9 +12,9 @@
 void dumpValue(PKVM* vm, Var value);
 
 // Dump opcodes of the given function.
-void dumpInstructions(PKVM* vm, Function* func);
+void dumpFunctionCode(PKVM* vm, Function* func);
 
-// Print stack track.
+// Dump the current (top most) stack call frame.
-void reportStackTrace(PKVM* vm);
+void dumpStackFrame(PKVM* vm);
 
 #endif // DEBUG_H

src/opcodes.h

@@ -15,7 +15,7 @@
 
 // Load the constant at index [arg] from the script's literals.
 // params: 2 byte (uint16_t) index value.
-OPCODE(CONSTANT, 2, 1)
+OPCODE(PUSH_CONSTANT, 2, 1)
 
 // Push null on the stack.
 OPCODE(PUSH_NULL, 0, 1)
@@ -29,6 +29,9 @@ OPCODE(PUSH_TRUE, 0, 1)
 // Push false on the stack.
 OPCODE(PUSH_FALSE, 0, 1)
 
+// Swap the top 2 stack values.
+OPCODE(SWAP, 0, 0)
+
 // Push a new list to construct from literal.
 // param: 2 bytes list size (defalt is 0).
 OPCODE(PUSH_LIST, 2, 1)
@@ -182,8 +185,6 @@ OPCODE(BIT_XOR, 0, -1)
 OPCODE(BIT_LSHIFT, 0, -1)
 OPCODE(BIT_RSHIFT, 0, -1)
 
-OPCODE(AND, 0, -1)
-OPCODE(OR, 0, -1)
 OPCODE(EQEQ, 0, -1)
 OPCODE(NOTEQ, 0, -1)
 OPCODE(LT, 0, -1)

src/var.c

@@ -79,22 +79,23 @@ void grayValue(Var self, PKVM* vm) {
 }
 
 void grayVarBuffer(VarBuffer* self, PKVM* vm) {
+  if (self == NULL) return;
   for (uint32_t i = 0; i < self->count; i++) {
     grayValue(self->data[i], vm);
   }
 }
 
-void grayStringBuffer(StringBuffer* self, PKVM* vm) {
+#define GRAY_OBJ_BUFFER(m_name)                               \
-  for (uint32_t i = 0; i < self->count; i++) {
+  void gray##m_name##Buffer(m_name##Buffer* self, PKVM* vm) { \
-    grayObject(&self->data[i]->_super, vm);
+    if (self == NULL) return;                                 \
-  }
+    for (uint32_t i = 0; i < self->count; i++) {              \
+      grayObject(&self->data[i]->_super, vm);                 \
+    }                                                         \
   }
 
-void grayFunctionBuffer(FunctionBuffer* self, PKVM* vm) {
+GRAY_OBJ_BUFFER(String)
-  for (uint32_t i = 0; i < self->count; i++) {
+GRAY_OBJ_BUFFER(Function)
-    grayObject(&self->data[i]->_super, vm);
+
-  }
-}
 
 static void blackenObject(Object* obj, PKVM* vm) {
   // TODO: trace here.

src/vm.c

@@ -6,7 +6,7 @@
 #include "vm.h"
 
 #include "core.h"
-#include "debug.h"
+//#include "debug.h" //< Wrap around debug macro.
 #include "utils.h"
 
 #define HAS_ERROR() (vm->fiber->error != NULL)
@@ -375,10 +375,19 @@ void pkSetRuntimeError(PKVM* vm, const char* message) {
 
 void vmReportError(PKVM* vm) {
   ASSERT(HAS_ERROR(), "runtimeError() should be called after an error.");
-
   // TODO: pass the error to the caller of the fiber.
 
-  reportStackTrace(vm);
+  // Print the Error message and stack trace.
+  if (vm->config.error_fn == NULL) return;
+  Fiber* fiber = vm->fiber;
+  vm->config.error_fn(vm, PK_ERROR_RUNTIME, NULL, -1, fiber->error->data);
+  for (int i = fiber->frame_count - 1; i >= 0; i--) {
+    CallFrame* frame = &fiber->frames[i];
+    Function* fn = frame->fn;
+    ASSERT(!fn->is_native, OOPS);
+    int line = fn->fn->oplines.data[frame->ip - fn->fn->opcodes.data - 1];
+    vm->config.error_fn(vm, PK_ERROR_STACKTRACE, fn->owner->name->data, line, fn->name);
+  }
 }
 
 // FIXME: temp.
@@ -530,7 +539,7 @@ PKInterpretResult vmRunScript(PKVM* vm, Script* _script) {
   Opcode instruction;
   SWITCH(instruction) {
 
-    OPCODE(CONSTANT):
+    OPCODE(PUSH_CONSTANT):
     {
       uint16_t index = READ_SHORT();
       ASSERT_INDEX(index, script->literals.count);
@@ -550,6 +559,16 @@ PKInterpretResult vmRunScript(PKVM* vm, Script* _script) {
       PUSH(VAR_FALSE);
       DISPATCH();
 
+    OPCODE(SWAP):
+    {
+      Var top1 = *(vm->fiber->sp - 1);
+      Var top2 = *(vm->fiber->sp - 2);
+
+      *(vm->fiber->sp - 1) = top2;
+      *(vm->fiber->sp - 2) = top1;
+      DISPATCH();
+    }
+
     OPCODE(PUSH_LIST):
     {
       List* list = newList(vm, (uint32_t)READ_SHORT());
@@ -754,7 +773,6 @@ PKInterpretResult vmRunScript(PKVM* vm, Script* _script) {
       DISPATCH();
     }
 
-
     OPCODE(JUMP_IF):
     {
       Var cond = POP();
@@ -929,21 +947,6 @@ PKInterpretResult vmRunScript(PKVM* vm, Script* _script) {
     OPCODE(BIT_XOR):
     OPCODE(BIT_LSHIFT):
     OPCODE(BIT_RSHIFT):
-    OPCODE(AND):
-      TODO;
-
-    OPCODE(OR):
-    {
-      TODO;
-      // Python like or operator.
-      //Var v1 = POP(), v2 = POP();
-      //if (toBool(v1)) {
-      //  PUSH(v1);
-      //} else {
-      //  PUSH(v2);
-      //}
-      DISPATCH();
-    }
 
     OPCODE(EQEQ) :
     {

test/lang/chain_call.pk

@@ -0,0 +1,27 @@
+
+## Chain call tests.
+
+# concatenative programming 
+
+def fn1(data)
+	return '[fn1:' + data + ']'
+end
+
+def fn2(data, suffix)
+	return '[fn2:' + data + '|' + suffix + ']'
+end
+
+def fn3(data)
+	return '[fn3:' + data + ']'
+end
+
+result = 'data' -> fn1 -> fn2{'suff'} -> fn3
+## `result -> print` same as `print(result)`
+assert(result == '[fn3:[fn2:[fn1:data]|suff]]')
+
+result = ' tEST+InG ' -> str_strip -> str_lower
+assert(result == 'test+ing')
+
+
+
+

test/lang/import.pk

@@ -1,9 +1,9 @@
 
 ## Testing import statement
-import os
+import lang
-import os, path
+import lang, path
-import os as o, path as p
+import lang as o, path as p
-from os import clock
+from lang import clock
-from os import clock as c
+from lang import clock as c
 from path import abspath, curdir
 from path import abspath as ap, curdir as cd

test/lang/logical.pk

@@ -5,8 +5,10 @@ val = 0
 
 a = false; b = true;
 if a and b then assert(false) end
-if a or b then va
+
-else assert(false, '') end
+if a or b then val = 42
+else assert(false) end
+assert(val == 42)
 
 get_true = func return true end
 

test/run_tests.bat

@@ -5,6 +5,7 @@ set files=(         ^
   lang\import.pk       ^
   lang\if.pk           ^
   lang\logical.pk      ^
+  lang\chain_call.pk   ^
                        ^
   examples\fib.pk      ^
   examples\prime.pk    ^