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-rw-r--r--src/plugins/mozjs/MozJsScriptEngine.cpp205
-rw-r--r--src/plugins/mozjs/MozJsScriptEngine.hpp31
2 files changed, 221 insertions, 15 deletions
diff --git a/src/plugins/mozjs/MozJsScriptEngine.cpp b/src/plugins/mozjs/MozJsScriptEngine.cpp
index e3f72b1..c67a3b4 100644
--- a/src/plugins/mozjs/MozJsScriptEngine.cpp
+++ b/src/plugins/mozjs/MozJsScriptEngine.cpp
@@ -16,6 +16,11 @@
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <cassert>
+#include <cstring>
+#include <iostream>
+#include <memory>
+
#include <jsapi.h>
#include "MozJsScriptEngine.hpp"
@@ -73,6 +78,102 @@ Variant MozJsScriptEngineFunction::call(const std::vector<Variant> &args) const
/* Class MozJsScriptEngineScope */
+static const uint32_t MOZJS_FUNCTION_DATA_MAGIC = 0x87aac4ca;
+
+struct MozJsFunctionData {
+ /**
+ * Magic number used to make sure a pointer points to an instance of this
+ * struct.
+ */
+ uint32_t magic;
+
+ /**
+ * Reference to the script engine scope.
+ */
+ MozJsScriptEngineScope &scope;
+
+ /**
+ * Actual function associated with the object.
+ */
+ std::unique_ptr<Function> function;
+
+ /**
+ * Constructor of the MozJsPrivateFunctionData instance.
+ */
+ MozJsFunctionData(MozJsScriptEngineScope &scope, Function *function)
+ : magic(MOZJS_FUNCTION_DATA_MAGIC), scope(scope), function(function)
+ {
+ }
+
+ /**
+ * Destructor, resets the magic to zero, marking this instance as invalid.
+ */
+ ~MozJsFunctionData() { magic = 0; }
+
+ /**
+ * Returns true if the magic is set to the correct value, indicating that
+ * this actually is an instance of MozPrivateFunctionData.
+ */
+ bool valid() { return magic == MOZJS_FUNCTION_DATA_MAGIC; }
+};
+
+/**
+ * Function used for deleting the private data that may be associated to a
+ * JSObject.
+ */
+void finalizeFunction(JSFreeOp *fop, JSObject *obj)
+{
+ MozJsFunctionData *data =
+ static_cast<MozJsFunctionData *>(JS_GetPrivate(obj));
+ if (data) {
+ assert(data->valid());
+ delete data;
+ }
+}
+
+/**
+ * Function used for calling back into the host.
+ */
+JSBool callFunction(JSContext *cx, unsigned argc, JS::Value *vp)
+{
+ // Fetch the arguments (including the callee and the parent/this object)
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+
+ // Fetch the underlying function object
+ JSObject &callee = args.callee();
+ MozJsFunctionData *data =
+ static_cast<MozJsFunctionData *>(JS_GetPrivate(&callee));
+ if (!data || !data->valid()) {
+ JS_ReportError(cx, "No valid function data attached to callable!");
+ return JS_FALSE;
+ }
+
+ // Assemble the function arguments
+ std::vector<Variant> arguments;
+ arguments.reserve(args.length());
+ for (unsigned i = 0; i < args.length(); i++) {
+ JS::Value val = args.get(i);
+ arguments.push_back(data->scope.valueToVariant(val));
+ }
+
+ try {
+ // Call the host function
+ Variant res = data->function->call(arguments);
+
+ // Convert the result to a JS::RootedValue
+ JS::RootedValue rval(cx);
+ data->scope.variantToValue(res, rval);
+
+ // Return the result to the script code
+ args.rval().set(rval);
+ return JS_TRUE;
+ }
+ catch (ArgumentValidatorError ex) {
+ JS_ReportError(cx, ex.what());
+ return JS_FALSE;
+ }
+}
+
/**
* The class of the global object.
*/
@@ -83,6 +184,13 @@ static JSClass globalClass = {
nullptr, nullptr, nullptr,
nullptr, nullptr};
+static JSClass functionClass = {
+ "function", JSCLASS_HAS_PRIVATE, JS_PropertyStub,
+ JS_DeletePropertyStub, JS_PropertyStub, JS_StrictPropertyStub,
+ JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub,
+ finalizeFunction, nullptr, callFunction,
+ nullptr, nullptr};
+
MozJsScriptEngineScope::MozJsScriptEngineScope(JSRuntime *rt) : rt(rt)
{
// Create the execution context
@@ -264,6 +372,94 @@ std::string MozJsScriptEngineScope::toString(JSString *str)
return res;
}
+void MozJsScriptEngineScope::variantToValue(const Variant &var,
+ JS::RootedValue &val)
+{
+ switch (var.getType()) {
+ case VariantType::null: {
+ val.setNull();
+ return;
+ }
+ case VariantType::boolean: {
+ val.setBoolean(var.getBooleanValue());
+ return;
+ }
+ case VariantType::integer: {
+ val.setInt32(var.getIntegerValue());
+ return;
+ }
+ case VariantType::number: {
+ val.setDouble(var.getNumberValue());
+ return;
+ }
+ case VariantType::string: {
+ // Allocate enough memory for the string stored in the variant
+ const size_t size = var.getStringValue().size();
+ const char *src = var.getStringValue().c_str();
+ JS::RootedString s(cx, JS_NewStringCopyN(cx, src, size));
+ if (!s) {
+ throw ScriptEngineException{"Out of JavaScript heap memory"};
+ }
+ val.setString(s);
+ return;
+ }
+ case VariantType::array: {
+ const std::vector<Variant> &src = var.getArrayValue();
+ JS::RootedObject a(cx, JS_NewArrayObject(cx, src.size(), nullptr));
+ for (size_t i = 0; i < src.size(); i++) {
+ JS::RootedValue aval(cx);
+ variantToValue(src[i], aval);
+ JS_DefineElement(cx, a, i, aval, JS_PropertyStub,
+ JS_StrictPropertyStub,
+ JSPROP_ENUMERATE | JSPROP_INDEX);
+ }
+ val.setObjectOrNull(a.get());
+ return;
+ }
+ case VariantType::map: {
+ const std::map<std::string, Variant> &src = var.getMapValue();
+ JS::RootedObject m(cx, JS_NewObject(cx, nullptr, nullptr, nullptr));
+ for (auto &e : src) {
+ setObjectProperty(m, e.first, e.second, false);
+ }
+ val.setObjectOrNull(m.get());
+ return;
+ }
+ case VariantType::function: {
+ JS::RootedObject f(cx, JS_NewObject(cx, &functionClass, nullptr, nullptr));
+ JS_SetPrivate(f, new MozJsFunctionData(*this, var.getFunctionValue()->clone()));
+ JS_FreezeObject(cx, f);
+ val.setObjectOrNull(f.get());
+ return;
+ }
+ default: {
+ val.setNull();
+ return;
+ }
+ }
+}
+
+void MozJsScriptEngineScope::setObjectProperty(JS::RootedObject &obj,
+ const std::string &name,
+ const Variant &var,
+ bool constant)
+{
+ // Construct the property flags for the given variant type -- objects and
+ // functions are treated as readonly properties no matter what "constant"
+ // is set to.
+ int flags = JSPROP_PERMANENT | JSPROP_ENUMERATE;
+ if (constant || var.getType() == VariantType::object ||
+ var.getType() == VariantType::function) {
+ flags |= JSPROP_READONLY;
+ }
+
+ // Handle errors occuring while setting the property
+ JS::RootedValue val(cx);
+ variantToValue(var, val);
+ handleErr(JS_DefineProperty(cx, obj, name.c_str(), val, JS_PropertyStub,
+ JS_StrictPropertyStub, flags));
+}
+
Variant MozJsScriptEngineScope::doRun(const std::string &code)
{
JS::Value rval;
@@ -273,15 +469,16 @@ Variant MozJsScriptEngineScope::doRun(const std::string &code)
}
void MozJsScriptEngineScope::doSetVariable(const std::string &name,
- const Variant &val, bool constant)
+ const Variant &var, bool constant)
{
- // TODO
+ setObjectProperty(*global, name, var, constant);
}
Variant MozJsScriptEngineScope::doGetVariable(const std::string &name)
{
- // TODO
- return Variant::Null;
+ JS::Value rval;
+ handleErr(JS_GetProperty(cx, *global, name.c_str(), &rval));
+ return valueToVariant(rval);
}
/* Class MozJsScriptEngine */
diff --git a/src/plugins/mozjs/MozJsScriptEngine.hpp b/src/plugins/mozjs/MozJsScriptEngine.hpp
index f98c871..02797bc 100644
--- a/src/plugins/mozjs/MozJsScriptEngine.hpp
+++ b/src/plugins/mozjs/MozJsScriptEngine.hpp
@@ -51,7 +51,8 @@ private:
JS::RootedObject *parent;
public:
- MozJsScriptEngineFunction(MozJsScriptEngineScope &scope, JS::Value &fun, JSObject *parent);
+ MozJsScriptEngineFunction(MozJsScriptEngineScope &scope, JS::Value &fun,
+ JSObject *parent);
~MozJsScriptEngineFunction();
@@ -61,8 +62,7 @@ public:
};
class MozJsScriptEngineScope : public ScriptEngineScope {
-
-friend MozJsScriptEngineFunction;
+ friend MozJsScriptEngineFunction;
private:
JSRuntime *rt;
@@ -72,6 +72,19 @@ private:
void handleErr(bool ok = false);
+protected:
+ Variant doRun(const std::string &code) override;
+ void doSetVariable(const std::string &name, const Variant &var,
+ bool constant) override;
+ Variant doGetVariable(const std::string &name) override;
+
+public:
+ MozJsScriptEngineScope(JSRuntime *rt);
+
+ ~MozJsScriptEngineScope() override;
+
+ /* JS -> Host */
+
Variant arrayToVariant(JSObject *obj);
Variant objectToVariant(JSObject *obj);
@@ -82,16 +95,12 @@ private:
std::string toString(JSString *str);
-protected:
- Variant doRun(const std::string &code) override;
- void doSetVariable(const std::string &name, const Variant &val,
- bool constant) override;
- Variant doGetVariable(const std::string &name) override;
+ /* Host -> JS */
-public:
- MozJsScriptEngineScope(JSRuntime *rt);
+ void variantToValue(const Variant &var, JS::RootedValue &val);
- ~MozJsScriptEngineScope() override;
+ void setObjectProperty(JS::RootedObject &obj, const std::string &name,
+ const Variant &var, bool constant);
};
class MozJsScriptEngine : public ScriptEngine {
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-30 21:01:10 +0000