mirror of
https://github.com/ChaiScript/ChaiScript.git
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810888defc
The Emscripten wrapper exported only the eval family, leaving JS consumers with no way to snapshot or restore the singleton ChaiScript engine. The playground in chaiscript.github.io needs that to reset between runs without reloading the WASM module. Added handle-based wrappers that hide ChaiScript::State behind an int registry so JS callers don't have to manage embind object lifetimes, exported them as saveState/restoreState/releaseState, and added a native regression test that exercises capture, restore, and release through the same wrapper functions the WASM binding uses. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
// Test that validates the save/restore/release state helpers used by the
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// Emscripten wrapper. A handle-based registry is exposed so the JS playground
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// can capture a pristine engine once and restore it between runs without
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// reloading the WASM module.
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#ifndef CHAISCRIPT_NO_THREADS
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#define CHAISCRIPT_NO_THREADS
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#endif
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#ifndef CHAISCRIPT_NO_DYNLOAD
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#define CHAISCRIPT_NO_DYNLOAD
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#endif
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#include "../emscripten/chaiscript_eval.hpp"
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#include <cassert>
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#include <chaiscript/chaiscript.hpp>
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#include <string>
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int main() {
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// Capture a baseline before any user code has been evaluated.
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const int baseline = chaiscript_save_state();
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assert(baseline > 0 && "saveState must return a positive handle");
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// Distinct calls produce distinct handles.
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const int second = chaiscript_save_state();
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assert(second != baseline && "saveState must mint a fresh handle each call");
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chaiscript_release_state(second);
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// Define a global that did not exist in the baseline.
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chaiscript_eval("var post_baseline_marker = 123");
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assert(chaiscript_eval_int("post_baseline_marker") == 123);
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// Restoring the baseline must drop the post-baseline definition: evaluating
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// it should now fail with eval_error because the variable is undefined.
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chaiscript_restore_state(baseline);
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[[maybe_unused]] bool caught = false;
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try {
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chaiscript_eval("post_baseline_marker");
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} catch (const chaiscript::exception::eval_error &) {
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caught = true;
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}
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assert(caught && "restoreState must drop globals defined after the snapshot");
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// The engine remains usable after a restore.
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chaiscript_eval("var after_restore = 7");
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assert(chaiscript_eval_int("after_restore * 6") == 42);
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// Releasing the handle is required so the registry does not grow unbounded.
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chaiscript_release_state(baseline);
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// Releasing a handle that was never minted (or has already been released) is
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// a no-op rather than an error.
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chaiscript_release_state(baseline);
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chaiscript_release_state(99999);
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// Restoring an unknown handle is a no-op: state must be unchanged.
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chaiscript_restore_state(99999);
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assert(chaiscript_eval_int("after_restore") == 7);
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return 0;
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}
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