int V8Regex::match(const String16& string, int startFrom, int* matchLength) const { if (matchLength) *matchLength = 0; if (m_regex.IsEmpty() || string.isEmpty()) return -1; // v8 strings are limited to int. if (string.length() > INT_MAX) return -1; v8::Isolate* isolate = m_debugger->isolate(); v8::HandleScope handleScope(isolate); v8::Local<v8::Context> context = m_debugger->regexContext(); v8::MicrotasksScope microtasks(isolate, v8::MicrotasksScope::kDoNotRunMicrotasks); v8::TryCatch tryCatch(isolate); v8::Local<v8::RegExp> regex = m_regex.Get(isolate); v8::Local<v8::Value> exec; if (!regex->Get(context, toV8StringInternalized(isolate, "exec")).ToLocal(&exec)) return -1; v8::Local<v8::Value> argv[] = { toV8String(isolate, string.substring(startFrom)) }; v8::Local<v8::Value> returnValue; if (!exec.As<v8::Function>()->Call(context, regex, WTF_ARRAY_LENGTH(argv), argv).ToLocal(&returnValue)) return -1; // RegExp#exec returns null if there's no match, otherwise it returns an // Array of strings with the first being the whole match string and others // being subgroups. The Array also has some random properties tacked on like // "index" which is the offset of the match. // // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec ASSERT(!returnValue.IsEmpty()); if (!returnValue->IsArray()) return -1; v8::Local<v8::Array> result = returnValue.As<v8::Array>(); v8::Local<v8::Value> matchOffset; if (!result->Get(context, toV8StringInternalized(isolate, "index")).ToLocal(&matchOffset)) return -1; if (matchLength) { v8::Local<v8::Value> match; if (!result->Get(context, 0).ToLocal(&match)) return -1; *matchLength = match.As<v8::String>()->Length(); } return matchOffset.As<v8::Int32>()->Value() + startFrom; }
v8::Local<v8::String> toV8StringInternalized(v8::Isolate* isolate, const String16& string) { if (string.isEmpty()) return v8::String::Empty(isolate); return v8::String::NewFromTwoByte(isolate, reinterpret_cast<const uint16_t*>(string.characters16()), v8::NewStringType::kInternalized, string.length()).ToLocalChecked(); }