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re-use global context for modules + provide module.exports

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This commit is contained in:
Stefan Siegl 2017-11-12 16:14:32 +01:00
parent c20c19c126
commit f3a46ff833
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2 changed files with 76 additions and 31 deletions
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41
tests/commonjs_node_compat_basic.phpt Normal file
View File

@ -0,0 +1,41 @@
--TEST--
Test V8::executeString() : exports/module.exports behaviour
--SKIPIF--
<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
--FILE--
<?php
$v8 = new V8Js();
$v8->setModuleLoader(function ($moduleName) {
return <<<'EOJS'
var_dump(typeof exports);
var_dump(typeof module.exports);
// for compatibility both should be linked
var_dump(exports === module.exports);
exports = { number: 23 };
module.exports = { number: 42 };
EOJS
;
});
$v8->executeString(<<<'EOJS'
var result = require('foo');
// expect module.exports value to be picked up
var_dump(typeof result);
var_dump(result.number);
EOJS
);
?>
===EOF===
--EXPECT--
string(6) "object"
string(6) "object"
bool(true)
string(6) "object"
int(42)
===EOF===

66
v8js_methods.cc
View File

@ -400,24 +400,7 @@ V8JS_METHOD(require)
convert_to_string(&module_code);
}
// Create a template for the global object and set the built-in global functions
v8::Local<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New(isolate);
global_template->Set(V8JS_SYM("print"), v8::FunctionTemplate::New(isolate, V8JS_MN(print)), v8::ReadOnly);
global_template->Set(V8JS_SYM("var_dump"), v8::FunctionTemplate::New(isolate, V8JS_MN(var_dump)), v8::ReadOnly);
global_template->Set(V8JS_SYM("sleep"), v8::FunctionTemplate::New(isolate, V8JS_MN(sleep)), v8::ReadOnly);
global_template->Set(V8JS_SYM("require"), v8::FunctionTemplate::New(isolate, V8JS_MN(require), v8::External::New(isolate, c)), v8::ReadOnly);
// Add the exports object in which the module can return its API
v8::Local<v8::ObjectTemplate> exports_template = v8::ObjectTemplate::New(isolate);
global_template->Set(V8JS_SYM("exports"), exports_template);
// Add the module object in which the module can have more fine-grained control over what it can return
v8::Local<v8::ObjectTemplate> module_template = v8::ObjectTemplate::New(isolate);
module_template->Set(V8JS_SYM("id"), V8JS_STR(normalised_module_id));
global_template->Set(V8JS_SYM("module"), module_template);
// Each module gets its own context so different modules do not affect each other
v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolate, v8::Context::New(isolate, NULL, global_template));
v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolate, c->context);
// Catch JS exceptions
v8::TryCatch try_catch(isolate);
@ -429,6 +412,7 @@ V8JS_METHOD(require)
// Enter the module context
v8::Context::Scope scope(context);
// Set script identifier
v8::Local<v8::String> sname = V8JS_STR(normalised_module_id);
@ -438,9 +422,12 @@ V8JS_METHOD(require)
return;
}
v8::Local<v8::String> source = V8JS_STRL(Z_STRVAL(module_code), static_cast<int>(Z_STRLEN(module_code)));
v8::Local<v8::String> source = V8JS_ZSTR(Z_STR(module_code));
zval_ptr_dtor(&module_code);
source = v8::String::Concat(V8JS_SYM("(function (exports, module) {"), source);
source = v8::String::Concat(source, V8JS_SYM("\n});"));
// Create and compile script
v8::Local<v8::Script> script = v8::Script::Compile(source, sname);
@ -454,11 +441,29 @@ V8JS_METHOD(require)
// Add this module and path to the stack
c->modules_stack.push_back(normalised_module_id);
c->modules_base.push_back(normalised_path);
// Run script
script->Run();
// Run script to evaluate closure
v8::Local<v8::Value> module_function = script->Run();
// Prepare exports & module object
v8::Local<v8::Object> exports = v8::Object::New(isolate);
v8::Local<v8::Object> module = v8::Object::New(isolate);
module->Set(V8JS_SYM("id"), V8JS_STR(normalised_module_id));
module->Set(V8JS_SYM("exports"), exports);
if (module_function->IsFunction()) {
v8::Local<v8::Value> *jsArgv = static_cast<v8::Local<v8::Value> *>(alloca(2 * sizeof(v8::Local<v8::Value>)));
new(&jsArgv[0]) v8::Local<v8::Value>;
jsArgv[0] = exports;
new(&jsArgv[1]) v8::Local<v8::Value>;
jsArgv[1] = module;
// actually call the module
v8::Local<v8::Function>::Cast(module_function)->Call(V8JS_GLOBAL(isolate), 2, jsArgv);
}
// Remove this module and path from the stack
c->modules_stack.pop_back();
@ -466,6 +471,12 @@ V8JS_METHOD(require)
efree(normalised_path);
if (!module_function->IsFunction()) {
info.GetReturnValue().Set(isolate->ThrowException(V8JS_SYM("Wrapped module script failed to return function")));
efree(normalised_module_id);
return;
}
// Script possibly terminated, return immediately
if (!try_catch.CanContinue()) {
info.GetReturnValue().Set(isolate->ThrowException(V8JS_SYM("Module script compile failed")));
@ -485,15 +496,8 @@ V8JS_METHOD(require)
// Cache the module so it doesn't need to be compiled and run again
// Ensure compatibility with CommonJS implementations such as NodeJS by playing nicely with module.exports and exports
if (context->Global()->Has(V8JS_SYM("module"))
&& context->Global()->Get(V8JS_SYM("module"))->IsObject()
&& context->Global()->Get(V8JS_SYM("module"))->ToObject()->Has(V8JS_SYM("exports"))
&& context->Global()->Get(V8JS_SYM("module"))->ToObject()->Get(V8JS_SYM("exports"))->IsObject()) {
// If module.exports has been set then we cache this arbitrary value...
newobj = context->Global()->Get(V8JS_SYM("module"))->ToObject()->Get(V8JS_SYM("exports"))->ToObject();
} else {
// ...otherwise we cache the exports object itself
newobj = context->Global()->Get(V8JS_SYM("exports"))->ToObject();
if (module->Has(V8JS_SYM("exports"))) {
newobj = module->Get(V8JS_SYM("exports"))->ToObject();
}
c->modules_loaded[normalised_module_id].Reset(isolate, newobj);