JavaScript: add v8 implementation

1 files changed, 253 insertions, 0 deletions

diff --git a/pdf/pdf_jsimp_v8.cpp b/pdf/pdf_jsimp_v8.cpp
new file mode 100644
index 00000000..158fe63c
--- /dev/null
+++ b/pdf/pdf_jsimp_v8.cpp
@@ -0,0 +1,253 @@
+/*
+ * This is a dummy JavaScript engine. It cheats by recognising the specific
+ * strings in calc.pdf, and hence will work only for that file. It is for
+ * testing only.
+ */
+
+extern "C" {
+#include "fitz-internal.h"
+#include "mupdf-internal.h"
+}
+
+#include <v8.h>
+
+using namespace v8;
+
+
+struct PDFJSImp
+{
+	fz_context			*ctx;
+	void				*jsctx;
+	Persistent<Context>	 context;
+
+	PDFJSImp(fz_context *ctx, void *jsctx) : ctx(ctx), jsctx(jsctx)
+	{
+		HandleScope scope;
+		context = Persistent<Context>::New(Context::New());
+	}
+
+	~PDFJSImp()
+	{
+		context.Dispose();
+	}
+};
+
+/* We need only a couple of specific methods for calc.pdf */
+struct PDFJSImpType
+{
+	PDFJSImp                  *imp;
+	Persistent<ObjectTemplate> templ;
+	pdf_jsimp_dtr             *dtr;
+
+	PDFJSImpType(PDFJSImp *imp, pdf_jsimp_dtr *dtr): imp(imp), dtr(dtr)
+	{
+		HandleScope scope;
+		templ = Persistent<ObjectTemplate>::New(ObjectTemplate::New());
+		templ->SetInternalFieldCount(1);
+	}
+
+	~PDFJSImpType()
+	{
+		templ.Dispose();
+	}
+};
+
+struct PDFJSImpMethod
+{
+	void             *jsctx;
+	pdf_jsimp_method *meth;
+
+	PDFJSImpMethod(void *jsctx, pdf_jsimp_method *meth) : jsctx(jsctx), meth(meth) {}
+};
+
+struct PDFJSImpProperty
+{
+	void             *jsctx;
+	pdf_jsimp_getter *get;
+	pdf_jsimp_setter *set;
+
+	PDFJSImpProperty(void *jsctx, pdf_jsimp_getter *get, pdf_jsimp_setter *set) : jsctx(jsctx), get(get), set(set) {}
+};
+
+class PDFJSImpObject
+{
+	Persistent<Value>   pobj;
+	String::Utf8Value  *utf8;
+
+public:
+	PDFJSImpObject(Handle<Value> obj)
+	{
+		pobj = Persistent<Value>::New(obj);
+		utf8 = NULL;
+	}
+
+	PDFJSImpObject(const char *str)
+	{
+		pobj = Persistent<Value>::New(String::New(str));
+		utf8 = NULL;
+	}
+
+	~PDFJSImpObject()
+	{
+		delete utf8;
+		pobj.Dispose();
+	}
+
+	char *toString()
+	{
+		delete utf8;
+		utf8 = new String::Utf8Value(pobj);
+		return **utf8;
+	}
+
+	Handle<Value> toValue()
+	{
+		return pobj;
+	}
+};
+
+
+extern "C" pdf_jsimp *pdf_new_jsimp(fz_context *ctx, void *jsctx)
+{
+	return reinterpret_cast<pdf_jsimp *>(new PDFJSImp(ctx, jsctx));
+}
+
+extern "C" void pdf_drop_jsimp(pdf_jsimp *imp)
+{
+	delete reinterpret_cast<PDFJSImp *>(imp);
+}
+
+extern "C" pdf_jsimp_type *pdf_jsimp_new_type(pdf_jsimp *imp, pdf_jsimp_dtr *dtr)
+{
+	return reinterpret_cast<pdf_jsimp_type *>(new PDFJSImpType((PDFJSImp *)imp, dtr));
+}
+
+extern "C" void pdf_jsimp_drop_type(pdf_jsimp *imp, pdf_jsimp_type *type)
+{
+	delete reinterpret_cast<PDFJSImpType *>(type);
+}
+
+static Handle<Value> callMethod(const Arguments &args)
+{
+	HandleScope scope;
+	Local<Object> self = args.Holder();
+	Local<External> owrap;
+	void *nself = NULL;
+	Local<External> mwrap = Local<External>::Cast(args.Data());
+	PDFJSImpMethod *m = (PDFJSImpMethod *)mwrap->Value();
+	int c = args.Length();
+	PDFJSImpObject **native_args = new PDFJSImpObject*[c];
+
+	if (self->InternalFieldCount() > 0)
+	{
+		owrap = Local<External>::Cast(self->GetInternalField(0));
+		nself = owrap->Value();
+	}
+
+	for (int i = 0; i < c; i++)
+		native_args[i] = new PDFJSImpObject(args[i]);
+
+	PDFJSImpObject *obj = reinterpret_cast<PDFJSImpObject *>(m->meth(m->jsctx, nself, c, reinterpret_cast<pdf_jsimp_obj **>(native_args)));
+	Handle<Value> val = obj->toValue();
+	delete obj;
+
+	for (int i = 0; i < c; i++)
+		delete native_args[i];
+
+	delete native_args;
+
+	return scope.Close(val);
+}
+
+extern "C" void pdf_jsimp_addmethod(pdf_jsimp *imp, pdf_jsimp_type *type, char *name, pdf_jsimp_method *meth)
+{
+	PDFJSImpType *vType = reinterpret_cast<PDFJSImpType *>(type);
+	HandleScope scope;
+
+	vType->templ->Set(String::New(name), FunctionTemplate::New(callMethod, External::New(new PDFJSImpMethod(vType->imp->jsctx, meth))));
+}
+
+static Handle<Value> getProp(Local<String> property, const AccessorInfo &info)
+{
+	HandleScope scope;
+	Local<Object> self = info.Holder();
+	Local<External> owrap = Local<External>::Cast(self->GetInternalField(0));
+	Local<External> pwrap = Local<External>::Cast(info.Data());
+	PDFJSImpProperty *p = reinterpret_cast<PDFJSImpProperty *>(pwrap->Value());
+
+	PDFJSImpObject *obj = reinterpret_cast<PDFJSImpObject *>(p->get(p->jsctx, owrap->Value()));
+	Handle<Value> val = obj->toValue();
+	delete obj;
+	return scope.Close(val);
+}
+
+static void setProp(Local<String> property, Local<Value> value, const AccessorInfo &info)
+{
+	HandleScope scope;
+	Local<Object> self = info.Holder();
+	Local<External> owrap = Local<External>::Cast(self->GetInternalField(0));
+	Local<External> wrap = Local<External>::Cast(info.Data());
+	PDFJSImpProperty *p = reinterpret_cast<PDFJSImpProperty *>(wrap->Value());
+	PDFJSImpObject *obj = new PDFJSImpObject(value);
+
+	p->set(p->jsctx, owrap->Value(), reinterpret_cast<pdf_jsimp_obj *>(obj));
+	delete obj;
+}
+
+extern "C" void pdf_jsimp_addproperty(pdf_jsimp *imp, pdf_jsimp_type *type, char *name, pdf_jsimp_getter *get, pdf_jsimp_setter *set)
+{
+	PDFJSImpType *vType = reinterpret_cast<PDFJSImpType *>(type);
+	HandleScope scope;
+
+	vType->templ->SetAccessor(String::New(name), getProp, setProp, External::New(new PDFJSImpProperty(vType->imp->jsctx, get, set)));
+}
+
+extern "C" void pdf_jsimp_set_global_type(pdf_jsimp *imp, pdf_jsimp_type *type)
+{
+	PDFJSImp	 *vImp  = reinterpret_cast<PDFJSImp *>(imp);
+	PDFJSImpType *vType = reinterpret_cast<PDFJSImpType *>(type);
+	HandleScope scope;
+
+	vImp->context = Persistent<Context>::New(Context::New(NULL, vType->templ));
+}
+
+extern "C" pdf_jsimp_obj *pdf_jsimp_new_obj(pdf_jsimp *imp, pdf_jsimp_type *type, void *natobj)
+{
+	PDFJSImpType *vType = reinterpret_cast<PDFJSImpType *>(type);
+	HandleScope scope;
+	Local<Object> obj = vType->templ->NewInstance();
+	obj->SetInternalField(0, External::New(natobj));
+
+	return reinterpret_cast<pdf_jsimp_obj *>(new PDFJSImpObject(obj));
+}
+
+extern "C" void pdf_jsimp_drop_obj(pdf_jsimp *imp, pdf_jsimp_obj *obj)
+{
+	delete reinterpret_cast<PDFJSImpObject *>(obj);
+}
+
+extern "C" pdf_jsimp_obj *pdf_jsimp_fromString(pdf_jsimp *imp, char *str)
+{
+	return reinterpret_cast<pdf_jsimp_obj *>(new PDFJSImpObject(str));
+}
+
+extern "C" char *pdf_jsimp_toString(pdf_jsimp *imp, pdf_jsimp_obj *obj)
+{
+	return reinterpret_cast<PDFJSImpObject *>(obj)->toString();
+}
+
+extern "C" void pdf_jsimp_execute(pdf_jsimp *imp, char *code)
+{
+	PDFJSImp *vImp = reinterpret_cast<PDFJSImp *>(imp);
+	HandleScope scope;
+	Context::Scope context_scope(vImp->context);
+	Script::Compile(String::New(code))->Run();
+}
+
+extern "C" void pdf_jsimp_execute_count(pdf_jsimp *imp, char *code, int count)
+{
+	PDFJSImp *vImp = reinterpret_cast<PDFJSImp *>(imp);
+	HandleScope scope;
+	Context::Scope context_scope(vImp->context);
+	Script::Compile(String::New(code, count))->Run();
+}
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