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lash 2023-04-16 12:37:12 +01:00
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README.md
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@ -18,10 +18,10 @@ The VM defines the following opcode symbols:
* `MOVE <symbol>` - Create a new execution frame, invalidating all previous `MAP` calls. More detailed: After a `MOVE` call, a `BACK` call will return to the same execution frame, with the same symbols available, but all `MAP` calls will have to be repeated. * `MOVE <symbol>` - Create a new execution frame, invalidating all previous `MAP` calls. More detailed: After a `MOVE` call, a `BACK` call will return to the same execution frame, with the same symbols available, but all `MAP` calls will have to be repeated.
* `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.
* `MSIZE <max> <min>` - Set min and max display size of menu part to `num` bytes.
* `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. * `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.
* `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.
* `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.
@ -35,6 +35,8 @@ Loaded symbols are not automatically exposed to the rendering client. To expose
The associated content of loaded symbols may be refreshed using the `RELOAD` opcode. `RELOAD` only works within the same constraints as `MAP`. However, updated content must be available even if a `MAP` precedes a `RELOAD` within the same frame. The associated content of loaded symbols may be refreshed using the `RELOAD` opcode. `RELOAD` only works within the same constraints as `MAP`. However, updated content must be available even if a `MAP` precedes a `RELOAD` within the same frame.
Methods handling `LOAD` symbols have the client input available to them.
### External symbol optimizations ### External symbol optimizations
@ -166,7 +168,7 @@ Template rendering is done using the `text/template` faciilty in the `golang` st
It expects all replacement symbols to be available at time of rendering, and has no tolerance for missing ones. It expects all replacement symbols to be available at time of rendering, and has no tolerance for missing ones.
### Runtime engine ## Runtime engine
The runtime engine: The runtime engine:
@ -181,6 +183,13 @@ There are two flavors of the engine:
* `engine.RunPersisted` - method which combines single vm executions with persisted state (e.g. http). * `engine.RunPersisted` - method which combines single vm executions with persisted state (e.g. http).
### Client identification
The `engine.Config` struct defines a property `SessionId` which is added to the `context.Context` passed through entire engine vm call roundtrip.
This is used to identify the caller, and thus defines a top-level storage key under which data entries should be retrieved.
## Bytecode examples ## Bytecode examples
(Minimal, WIP) (Minimal, WIP)
@ -216,7 +225,7 @@ Outputs bytecodes and templates for test data scenarios used in `engine` unit te
### Interactive runner ### Interactive runner
`go run ./dev/interactive [-d <data_directory>] [--root <root_symbol>]` `go run ./dev/interactive [-d <data_directory>] [--root <root_symbol>] [--session-id <session_id>]`
Creates a new interactive session using `engine.DefaultEngine`, starting execution at symbol `root_symbol` Creates a new interactive session using `engine.DefaultEngine`, starting execution at symbol `root_symbol`
@ -226,6 +235,8 @@ If `data_directory` is not set, current directory will be used.
if `root_symbol` is not set, the symbol `root` will be used. if `root_symbol` is not set, the symbol `root` will be used.
if `session_id` is set, mutable data will be stored and retrieved keyed by the given identifer (if implemented).
### Assembler ### Assembler
@ -247,7 +258,9 @@ Found in `examples/`.
Be sure to `make examples` before running them. Be sure to `make examples` before running them.
Can be run with e.g. `go run ./examples/<case> -s 80` Can be run with e.g. `go run ./examples/<case> [...]`
The available options are the same as for the `dev/interactive` tool.
Contents of the case directory: Contents of the case directory: