# LinuxCNC WASM SDK

This SDK exposes browser/Node JavaScript wrappers for standalone WASM modules
built from vendored LinuxCNC source.

## Boundary

The SDK is a host-boundary layer only. It may:

- load generated Emscripten modules;
- allocate and free C strings;
- write text files into the Emscripten filesystem;
- call exported C ABI functions;
- return LinuxCNC-produced text output to JavaScript callers.

The SDK must not implement G-code interpretation, canonical motion behavior,
tool semantics, parameter semantics, kinematics, or planner behavior. Those
behaviors must continue to come from vendored LinuxCNC source through the C ABI.

## Entrypoints

Use `src/index.js` for stable imports:

```js
import {
  createLinuxCncIniSdk,
  createLinuxCncInterpSdk,
  planIniFileContextStaging,
  planSimConfigStaging,
} from "./src/index.js";
```

`createLinuxCncIniSdk()` wraps the INI parser module built from vendored
LinuxCNC `inifile.cc` and exposes `getString()` plus `getBool()`. Boolean
conversion is performed by vendored LinuxCNC `iniFindBool()`.

`createLinuxCncInterpSdk()` wraps the interpreter-core module built from
vendored LinuxCNC RS274NGC sources and exposes:

- `runProgram(programText)`
- `runProgramWithIni(programText, iniPath)`
- `runFile(path)`
- `runFileWithIni(path, iniPath)`
- `runFileWithIniContinueOnError(path, iniPath)`
- `runSimConfigProgram({ iniPath, programPath, files, executionMode })`
- `runFiveAxisRemapFile(path, iniPath)`
- `runRemapFile(path, iniPath)`
- `runRemapIoMdiSequence(iniPath)`
- `restoreParameters(path)`
- `saveParameters(path, values)`
- `loadToolTable(path, options)`
- `saveToolTable(path)`
- `writeTextFile(path, text)`
- `readTextFile(path)`

`loadToolTable()` accepts `{ randomToolChanger: true }` to select the
LinuxCNC random-toolchanger branch before calling vendored
`tooldata_load()`. The SDK only forwards that runtime boundary flag.

`runFiveAxisRemapFile()` is a narrow host boundary for vendored LinuxCNC
sample-machine remap validation. Callers provide INI/remap/demo files in the
WASM filesystem; the C ABI runs vendored LinuxCNC `REMAP`, O-word, file
execution, and HAL adapter paths.

`runRemapFile()` is the generic remap-test equivalent for vendored LinuxCNC
tests such as `tests/remap/duplicate-o-word`. It reads LinuxCNC INI
`SUBROUTINE_PATH` and `REMAP` entries, then calls vendored LinuxCNC
`Interp::parse_remap()`, `open()`, `read()`, and `execute()`.

`runRemapIoMdiSequence()` is a narrow regression boundary for the NGC-only
branch of vendored LinuxCNC `tests/remap/remap-io/test-ngc.ini`. The C ABI
reads LinuxCNC `REMAP` entries, then feeds the upstream test driver's MDI
command sequence into vendored `Interp::execute()`. JavaScript only copies the
vendored INI/subroutine files into the WASM filesystem and forwards the INI
path; it does not implement M62-M68, M66 input, or remap semantics.

`runFileWithIni()` is the plain interpreter-file equivalent for upstream tests
that need LinuxCNC INI search paths, such as
`tests/interp/sub-call-from-sub`. The C ABI reads LinuxCNC
`SUBROUTINE_PATH` and then calls vendored `Interp::open()`, `read()`, and
`execute()`; the SDK only copies files and forwards paths.

`runSimConfigProgram()` is a convenience host boundary for representative
LinuxCNC `configs/sim` programs. Callers provide `{ path, text, executable }`
file entries, an INI path, and a program path. The SDK writes those text files
into the Emscripten filesystem, applies executable bits for user M-code files,
then forwards to `runFileWithIni()` by default or to `runFiveAxisRemapFile()`
when `executionMode: "fiveAxisRemap"` is explicitly requested.

`planIniFileContextStaging()` is the generic file-staging planner for
LinuxCNC INI-driven interpreter runs. Callers provide vendored source-manifest
text, a source root, an INI file name, INI text, and a target WASM directory.
The planner reads only INI file references and the manifest, then returns the
INI, `[DISPLAY]OPEN_FILE`, `[EMCIO]TOOL_TABLE`,
`[RS274NGC]PARAMETER_FILE`, `[RS274NGC]SUBROUTINE_PATH`,
`[RS274NGC]USER_M_PATH`, and remap-NGC files that should be copied into the
Emscripten filesystem. Each planned file includes `sourceRel`, `wasmPath`, the
legacy alias `path`, and `executable`. It does not implement G-code, tool,
parameter, remap, or user-M semantics.

`planSimConfigStaging()` is the companion convenience wrapper for
representative LinuxCNC `configs/sim` programs. Callers provide the vendored
source manifest text, machine relative path, INI file name, and INI text. It
uses `planIniFileContextStaging()` with a `configs/sim/<machine>` source root
and `configs/sim` upward-search boundary.

`runFileWithIniContinueOnError()` uses the same LinuxCNC-backed file execution
path but keeps the runner loop going after LinuxCNC reports an error, matching
upstream `rs274 -n 0` regression tests such as `tests/interp/oword-unwind`.
It does not implement or reinterpret LinuxCNC error semantics.