Add warnings for unimplemented features. Update README.

Author: weaversam8

README.md

@@ -50,27 +50,10 @@ A few gotchas to look out for:
 - Make sure to open the compiled story file as a binary file (see the above example, use `open(filename, 'rb')`) in order for it to be properly parsed by the compiled protobuf library.
 - Unless you pass `autostart=False` to the runner when creating it, it will automatically start and run to the next choice point.
 
-All Yarn Spinner opcodes are currently implemented. This may certainly change over time, if new opcodes are added to the language. The current status is:
-
-| OpCode           | Status                                                 |
-| ---------------- | ------------------------------------------------------ |
-| `JUMP_TO`        | ✅  Implemented in `runner.__jump_to`        |
-| `JUMP`           | ✅  Implemented in `runner.__jump`           |
-| `RUN_LINE`       | ✅  Implemented in `runner.__run_line`       |
-| `RUN_COMMAND`    | ✅  Implemented in `runner.__run_command`    |
-| `ADD_OPTION`     | ✅  Implemented in `runner.__add_option`     |
-| `SHOW_OPTIONS`   | ✅  Implemented in `runner.__show_options`   |
-| `PUSH_STRING`    | ✅  Implemented in `runner.__push_string`    |
-| `PUSH_FLOAT`     | ✅  Implemented in `runner.__push_float`     |
-| `PUSH_BOOL`      | ✅  Implemented in `runner.__push_bool`      |
-| `PUSH_NULL`      | ✅  Implemented in `runner.__push_null`      |
-| `JUMP_IF_FALSE`  | ✅  Implemented in `runner.__jump_if_false`  |
-| `POP`            | ✅  Implemented in `runner.__pop`            |
-| `CALL_FUNC`      | ✅  Implemented in `runner.__call_func`      |
-| `PUSH_VARIABLE`  | ✅  Implemented in `runner.__push_variable`  |
-| `STORE_VARIABLE` | ✅  Implemented in `runner.__store_variable` |
-| `STOP`           | ✅  Implemented in `runner.__stop`           |
-| `RUN_NODE`       | ✅  Implemented in `runner.__run_node`       |
+As of version 2.0, all Yarn Spinner opcodes are currently implemented, as well as Yarn's internal standard library of functions and operators. This may certainly change over time, if new opcodes, functions, or operators are added to the language. The current missing features are:
+
+- Inline expressions [(see Yarn docs)](https://yarnspinner.dev/docs/writing/expressions-and-variables/#inline-expressions)
+- Localisation tags and Format functions [(see Yarn syntax reference)](https://yarnspinner.dev/docs/syntax/#localisation-tags)
 
 ## Development
 

examples/expressions.csv

@@ -0,0 +1,2 @@
+id,text,file,node,lineNumber
+expressions-Start-0,Hello there {0}.,expressions,Start,5

examples/expressions.yarn

@@ -0,0 +1,6 @@
+title: Start
+---
+<<set $name to "Sam">>
+
+Hello there {$name}.
+===

examples/expressions.yarnc

@@ -0,0 +1,23 @@
+import os
+from .context import YarnRunner
+
+compiled_yarn_f = open(os.path.join(os.path.dirname(
+    __file__), '../examples/expressions.yarnc'), 'rb')
+names_csv_f = open(os.path.join(os.path.dirname(
+    __file__), '../examples/expressions.csv'), 'r')
+
+runner = YarnRunner(compiled_yarn_f, names_csv_f, autostart=False)
+
+# TODO: implement a test for expression parsing
+
+
+def test_expressions():
+    try:
+        runner.resume()
+
+        # the runner should throw an error
+        raise Exception(
+            "The runner ran without any issues. This test should fail. An Exception was expected.")
+    except Exception as e:
+        assert str(
+            e) == "Yarn stories with interpolated inline expressions are not yet supported."

tests/test_expressions.py

@@ -59,6 +59,12 @@ def __find_label(self, label_key):
             raise Exception(
                 f"The current node `{self.current_node}` does not have a label named `{label_key}")
 
+    def __find_expressions(self, operand):
+        # TODO: implement this functionality
+        if int(operand.float_value) != 0:
+            raise Exception(
+                f"Yarn stories with interpolated inline expressions are not yet supported.")
+
     def __debug_log(self, msg, **kwargs):
         if self._enable_tracing:
             print(msg, **kwargs)
@@ -160,21 +166,43 @@ def __go_to_node(self, node_key):
     def __run_line(self, instruction):
         string_key = instruction.operands[0].string_value
 
+        # if this instruction has a second operand, it's the number of expressions
+        # on the line that need to be evaluated.
+        if len(instruction.operands) > 1:
+            line_substitutions = self.__find_expressions(
+                instruction.operands[1])
+            # TODO: implement substitutions
+
         self._line_buffer.append(self.__lookup_string(string_key))
 
     def __run_command(self, instruction):
         command, *args = instruction.operands[0].string_value.split(" ")
+
         if command not in self._command_handlers.keys():
             warn(
                 f"Command '{command}' does not have a registered command handler.")
         else:
-            # TODO: maybe do some argument parsing later
+            # if this instruction has a second operand, it's the number of expressions
+            # on the line that need to be evaluated.
+            if len(instruction.operands) > 1:
+                line_substitutions = self.__find_expressions(
+                    instruction.operands[1])
+                # TODO: implement substitutions
+
+            # TODO: maybe do some argument type parsing later
             self._command_handlers[command](*args)
 
     def __add_option(self, instruction):
         title_string_key = instruction.operands[0].string_value
         choice_path = instruction.operands[1].string_value
 
+        # if this instruction has a second operand, it's the number of expressions
+        # on the line that need to be evaluated.
+        if len(instruction.operands) > 2:
+            line_substitutions = self.__find_expressions(
+                instruction.operands[2])
+            # TODO: implement substitutions
+
         self._option_buffer.append({
             'index': len(self._option_buffer),
             'text': self.__lookup_string(title_string_key),
@@ -281,12 +309,6 @@ def __process_instruction(self):
 
         instruction = self._vm_instruction_stack[self._program_counter]
 
-        def noop(instruction):
-            if (len(instruction.operands) > 0):
-                print(instruction.operands)
-            raise Exception(
-                f"OpCode {Instruction.OpCode.Name(instruction.opcode)} is not yet implemented")
-
         opcode_functions = {
             Instruction.OpCode.JUMP_TO: self.__jump_to,
             Instruction.OpCode.JUMP: self.__jump,
@@ -308,6 +330,13 @@ def noop(instruction):
         }
 
         self._program_counter += 1
+
+        if instruction.opcode not in opcode_functions:
+            if (len(instruction.operands) > 0):
+                print(instruction.operands)
+            raise Exception(
+                f"OpCode {Instruction.OpCode.Name(instruction.opcode)} is not yet implemented")
+
         opcode_functions[instruction.opcode](instruction)
 
         if not self.paused and not self.finished: