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libxmljs.cc
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libxmljs.cc
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// Copyright 2009, Squish Tech, LLC.
#include "libxmljs.h"
#include "xml_syntax_error.h"
#include "xml_document.h"
#include "xml_node.h"
#include "xml_parser.h"
#include "html_parser.h"
namespace libxmljs {
v8::Persistent<v8::FunctionTemplate> memory_usage;
namespace {
void on_libxml_destruct(xmlNode* node) {
}
} // namespace
LibXMLJS::LibXMLJS() {
xmlInitParser(); // Not always necessary, but necessary for thread safety.
// xmlRegisterNodeDefault(on_libxml_construct);
xmlDeregisterNodeDefault(on_libxml_destruct);
// xmlThrDefRegisterNodeDefault(on_libxml_construct);
xmlThrDefDeregisterNodeDefault(on_libxml_destruct);
}
LibXMLJS::~LibXMLJS() {
xmlCleanupParser(); // As per xmlInitParser(), or memory leak will happen.
}
LibXMLJS LibXMLJS::init_;
static void
OnFatalError(const char* location,
const char* message) {
#define FATAL_ERROR "\033[1;31mV8 FATAL ERROR.\033[m"
if (location)
fprintf(stderr, FATAL_ERROR " %s %s\n", location, message);
else
fprintf(stderr, FATAL_ERROR " %s\n", message);
exit(1);
}
// Extracts a C str from a V8 Utf8Value.
// TODO: Fix this error state, maybe throw exception?
const char *
ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<str conversion failed>";
}
static void
ReportException(v8::TryCatch* try_catch) {
v8::Handle<v8::Message> message = try_catch->Message();
if (message.IsEmpty()) {
fprintf(stderr, "Error: (no message)\n");
fflush(stderr);
return;
}
v8::Handle<v8::Value> error = try_catch->Exception();
v8::Handle<v8::String> stack;
if (error->IsObject()) {
v8::Handle<v8::Object> obj = v8::Handle<v8::Object>::Cast(error);
v8::Handle<v8::Value> raw_stack = obj->Get(v8::String::New("stack"));
if (raw_stack->IsString()) stack = v8::Handle<v8::String>::Cast(raw_stack);
}
if (stack.IsEmpty()) {
v8::String::Utf8Value exception(error);
// Print (filename):(line number): (message).
v8::String::Utf8Value filename(message->GetScriptResourceName());
const char* filename_string = ToCString(filename);
int linenum = message->GetLineNumber();
fprintf(stderr, "%s:%i: %s\n", filename_string, linenum, *exception);
// Print line of source code.
v8::String::Utf8Value sourceline(message->GetSourceLine());
const char* sourceline_string = ToCString(sourceline);
fprintf(stderr, "%s\n", sourceline_string);
// Print wavy underline (GetUnderline is deprecated).
int start = message->GetStartColumn();
for (int i = 0; i < start; i++) {
fprintf(stderr, " ");
}
int end = message->GetEndColumn();
for (int i = start; i < end; i++) {
fprintf(stderr, "^");
}
fprintf(stderr, "\n");
message->PrintCurrentStackTrace(stderr);
} else {
v8::String::Utf8Value trace(stack);
fprintf(stderr, "%s\n", *trace);
}
fflush(stderr);
}
// Executes a str within the current v8 context.
v8::Handle<v8::Value>
ExecuteString(v8::Handle<v8::String> source,
v8::Handle<v8::Value> filename) {
v8::HandleScope scope;
v8::TryCatch try_catch;
v8::Handle<v8::Script> script = v8::Script::Compile(source, filename);
if (script.IsEmpty()) {
ReportException(&try_catch);
exit(1);
}
v8::Handle<v8::Value> result = script->Run();
if (result.IsEmpty()) {
ReportException(&try_catch);
exit(1);
}
return scope.Close(result);
}
static void
ExecuteNativeJS(const char* filename,
const char* data) {
v8::HandleScope scope;
v8::TryCatch try_catch;
ExecuteString(v8::String::New(data), v8::String::New(filename));
if (try_catch.HasCaught()) {
puts("There is an error in Node's built-in javascript");
puts("This should be reported as a bug!");
ReportException(&try_catch);
exit(1);
}
}
void
UpdateV8Memory() {
v8::V8::AdjustAmountOfExternalAllocatedMemory(-current_xml_memory);
current_xml_memory = xmlMemUsed();
v8::V8::AdjustAmountOfExternalAllocatedMemory(current_xml_memory);
}
v8::Handle<v8::Value>
MemoryUsage(const v8::Arguments& args) {
v8::HandleScope scope;
v8::Local<v8::Object> obj = v8::Object::New();
long c = xmlMemUsed();
obj->Set(v8::String::New("libxml"), v8::Integer::New(c));
obj->Set(v8::String::New("v8"), v8::Integer::New(current_xml_memory));
return scope.Close(obj);
}
void
InitializeLibXMLJS(v8::Handle<v8::Object> target) {
v8::HandleScope scope;
xmlMemSetup(xmlMemFree, xmlMemMalloc, xmlMemRealloc, xmlMemoryStrdup);
xmlInitMemory();
XmlSyntaxError::Initialize(target);
XmlDocument::Initialize(target);
XmlParser::Initialize(target);
HtmlParser::Initialize(target);
target->Set(v8::String::NewSymbol("version"),
v8::String::New(LIBXMLJS_VERSION));
target->Set(v8::String::NewSymbol("libxml_version"),
v8::String::New(LIBXML_DOTTED_VERSION));
target->Set(v8::String::NewSymbol("libxml_parser_version"),
v8::String::New(xmlParserVersion));
target->Set(v8::String::NewSymbol("libxml_debug_enabled"),
v8::Boolean::New(debugging));
v8::Local<v8::FunctionTemplate> func = v8::FunctionTemplate::New(MemoryUsage);
memory_usage = v8::Persistent<v8::FunctionTemplate>::New(func);
memory_usage->InstanceTemplate()->SetInternalFieldCount(1);
target->Set(v8::String::NewSymbol("memoryUsage"),
memory_usage->GetFunction());
v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
v8::Handle<v8::Context> context = v8::Context::New(NULL, global);
v8::Context::Scope context_scope(context);
context->Global()->Set(v8::String::NewSymbol("libxml"), target);
ExecuteNativeJS("xml_sax_parser.js", native_xml_sax_parser);
ExecuteNativeJS("xml_document.js", native_xml_document);
ExecuteNativeJS("xml_element.js", native_xml_element);
}
// used by node.js to initialize libraries
extern "C" void
init(v8::Handle<v8::Object> target) {
v8::HandleScope scope;
InitializeLibXMLJS(target);
}
int
main(int argc,
char* argv[]) {
v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
v8::V8::Initialize();
v8::V8::SetFatalErrorHandler(OnFatalError);
// Create a stack-allocated handle scope.
v8::HandleScope handle_scope;
// Create a new context.
v8::Handle<v8::Context> context = v8::Context::New();
// Enter the created context for compiling and
// running the hello world script.
v8::Context::Scope context_scope(context);
v8::Local<v8::Object> global_obj = v8::Context::GetCurrent()->Global();
v8::Local<v8::Object> libxml_obj = v8::Object::New();
InitializeLibXMLJS(libxml_obj);
global_obj->Set(v8::String::NewSymbol("libxml"), libxml_obj);
// for (int i = 1; i < argc; i++) {
// // Create a string containing the JavaScript source code.
// Handle<String> source = ReadFile(argv[i]);
// // Compile the source code.
// Handle<Script> script = Script::Compile(source);
// // Run the script to get the result.
// Handle<Value> result = script->Run();
// }
v8::V8::Dispose();
return 0;
}
} // namespace libxmljs