zuzu-rust 0.6.0

Rust implementation of ZuzuScript
Documentation 
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from std/eval import eval;
from test/eval_policy import
	eval_policy_fs_denied,
	eval_policy_require_fs;
from test/more import *;

requires_capability("fs");

is(
	eval_policy_fs_denied(),
	false,
	"test policy helper sees filesystem capability by default",
);
is(
	eval( "__system__{deny_fs};", deny_fs: true ),
	true,
	"eval deny_fs is visible to direct eval code",
);
is(
	__system__{deny_fs},
	false,
	"eval deny_fs overlay is restored after direct eval",
);
let direct_exception := exception( function () {
	eval( "die \"eval policy restoration check\";", deny_fs: true );
} );
ok(
	direct_exception instanceof Exception,
	"eval exception path throws while denial overlay is active",
);
is(
	__system__{deny_fs},
	false,
	"eval deny_fs overlay is restored after direct eval exception",
);
is(
	eval_policy_require_fs(),
	"fs-ok",
	"test policy helper can run before eval overlay",
);

let clib_result := null;
let clib_error := exception( function () {
	clib_result := eval(
		"__system__{deny_clib};",
		deny_clib: true,
	);
} );
ok(
	clib_error ≡ null,
	"eval accepts deny_clib named policy overlay",
);
is(
	clib_result,
	true,
	"eval deny_clib is visible to direct eval code",
);

let worker_result := null;
let worker_error := exception( function () {
	worker_result := eval(
		"__system__{deny_worker};",
		deny_worker: true,
	);
} );
ok(
	worker_error ≡ null,
	"eval accepts deny_worker named policy overlay",
);
is(
	worker_result,
	true,
	"eval deny_worker is visible to direct eval code",
);

let module_error := exception( function () {
	eval("eval_policy_require_fs();", deny_fs: true);
} );
ok(
	module_error instanceof Exception,
	"eval deny_fs is visible to imported module functions",
);
like(
	module_error{message},
	/TEST_EVAL_POLICY_FS_DENIED/,
	"module function reports filesystem-denied overlay",
);

is(
	eval(
		"eval(\"__system__{deny_fs};\", deny_fs: false);",
		deny_fs: true,
	),
	true,
	"nested eval cannot relax an outer deny_fs overlay",
);

is(
	__system__{deny_fs},
	false,
	"eval deny_fs overlay is restored after nested/module eval",
);

done_testing();