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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.
* `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.
* `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.
* `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.
* `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.
@ -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.
Methods handling `LOAD` symbols have the client input available to them.
### 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.
### Runtime engine
## 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).
### 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
(Minimal, WIP)
@ -216,7 +225,7 @@ Outputs bytecodes and templates for test data scenarios used in `engine` unit te
### 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`
@ -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 `session_id` is set, mutable data will be stored and retrieved keyed by the given identifer (if implemented).
### Assembler
@ -247,7 +258,9 @@ Found in `examples/`.
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: