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lash 2023-04-16 12:46:48 +01:00
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@ -8,22 +8,21 @@ Original motivation was to create a simple templating renderer for USSD clients,
## Opcodes ## Opcodes
The VM defines the following opcode symbols: The VM defines the following opcode symbols, alphabetically:
* `CATCH <symbol> <signal>` - Jump to symbol if signal is set (see `signals` below). * `CATCH <symbol> <signal>` - Jump to symbol if signal is set (see `signals` below). If match, has same side-effect as move.
* `CROAK <signal>` - Clear state and restart execution from top if signal is set (see `signals` below). * `CROAK <signal>` - Clear state and restart execution from top if signal is set (see `signals` below). If match, has same side-effect as move.
* `LOAD <symbol> <size>` - Execute the code symbol `symbol` and cache the data, constrained to the given `size`. Can be exposed with `MAP` within scope,
* `RELOAD <symbol>` - Execute a code symbol already loaded by `LOAD` and cache the data, constrained to the previously given `size` for the same symbol.
* `MAP <symbol>` - Expose a code symbol previously loaded by `LOAD` to the rendering client. Roughly corresponds to the `global` directive in Python.
* `MOVE <symbol>` - Create a new execution frame, invalidating all previous `MAP` calls.
* `HALT` - Stop execution. The remaining bytecode (typically, the routing code for the node) is returned to the invoking function. * `HALT` - Stop execution. The remaining bytecode (typically, the routing code for the node) is returned to the invoking function.
* `INCMP <arg> <symbol>` - Compare registered input to `arg`. If match, it has the same side-effects as `MOVE`. In addition, any consecutive `INCMP` matches will be ignored until `HALT` is called. * `INCMP <arg> <symbol>` - Compare registered input to `arg`. If match, it has the same side-effects as `MOVE`. In addition, any consecutive `INCMP` matches will be ignored until `HALT` is called.
* `MOUT <choice> <display>` - Add menu display entry. Each entry should have a matching `INCMP` whose `arg` matches `choice`. `display` is a descriptive text of the menu item. * `LOAD <symbol> <size>` - Execute the code symbol `symbol` and cache the data, constrained to the given `size`. Can be exposed with `MAP` within scope. See "External code" below.
* `MAP <symbol>` - Expose a code symbol previously loaded by `LOAD` to the rendering client. Roughly corresponds to the `global` directive in Python.
* `MNEXT <choice> <display>` - Define how to display the choice for advancing when browsing menu. * `MNEXT <choice> <display>` - Define how to display the choice for advancing when browsing menu.
* `MOUT <choice> <display>` - Add menu display entry. Each entry should have a matching `INCMP` whose `arg` matches `choice`. `display` is a descriptive text of the menu item.
* `MOVE <symbol>` - Create a new execution frame, invalidating all previous `MAP` calls.
* `MPREV <choice> <display>` - Define how to display the choice for returning when browsing menu. * `MPREV <choice> <display>` - Define how to display the choice for returning when browsing menu.
* `MSIZE <max> <min>` - **Not yet implemented**. Set min and max display size of menu part to `num` bytes.
* `MSEP` - **Not yet implemented**. Marker for menu page separation. Incompatible with browseable nodes. * `MSEP` - **Not yet implemented**. Marker for menu page separation. Incompatible with browseable nodes.
* `MSIZE <max> <min>` - **Not yet implemented**. Set min and max display size of menu part to `num` bytes.
* `RELOAD <symbol>` - Execute a code symbol already loaded by `LOAD` and cache the data, constrained to the previously given `size` for the same symbol. See "External code" below.
### External code ### External code