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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/regexp/regexp-utils.h"
#include "src/factory.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/regexp/jsregexp.h"
namespace v8 {
namespace internal {
Handle<String> RegExpUtils::GenericCaptureGetter(
Isolate* isolate, Handle<RegExpMatchInfo> match_info, int capture,
bool* ok) {
const int index = capture * 2;
if (index >= match_info->NumberOfCaptureRegisters()) {
if (ok != nullptr) *ok = false;
return isolate->factory()->empty_string();
}
const int match_start = match_info->Capture(index);
const int match_end = match_info->Capture(index + 1);
if (match_start == -1 || match_end == -1) {
if (ok != nullptr) *ok = false;
return isolate->factory()->empty_string();
}
if (ok != nullptr) *ok = true;
Handle<String> last_subject(match_info->LastSubject());
return isolate->factory()->NewSubString(last_subject, match_start, match_end);
}
namespace {
V8_INLINE bool HasInitialRegExpMap(Isolate* isolate, Handle<JSReceiver> recv) {
return recv->map() == isolate->regexp_function()->initial_map();
}
} // namespace
MaybeHandle<Object> RegExpUtils::SetLastIndex(Isolate* isolate,
Handle<JSReceiver> recv,
int value) {
if (HasInitialRegExpMap(isolate, recv)) {
JSRegExp::cast(*recv)->SetLastIndex(value);
return recv;
} else {
return Object::SetProperty(recv, isolate->factory()->lastIndex_string(),
handle(Smi::FromInt(value), isolate), STRICT);
}
}
MaybeHandle<Object> RegExpUtils::GetLastIndex(Isolate* isolate,
Handle<JSReceiver> recv) {
if (HasInitialRegExpMap(isolate, recv)) {
return handle(JSRegExp::cast(*recv)->LastIndex(), isolate);
} else {
return Object::GetProperty(recv, isolate->factory()->lastIndex_string());
}
}
// ES#sec-regexpexec Runtime Semantics: RegExpExec ( R, S )
// Also takes an optional exec method in case our caller
// has already fetched exec.
MaybeHandle<Object> RegExpUtils::RegExpExec(Isolate* isolate,
Handle<JSReceiver> regexp,
Handle<String> string,
Handle<Object> exec) {
if (exec->IsUndefined(isolate)) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, exec,
Object::GetProperty(regexp, isolate->factory()->exec_string()), Object);
}
if (exec->IsCallable()) {
const int argc = 1;
ScopedVector<Handle<Object>> argv(argc);
argv[0] = string;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
Execution::Call(isolate, exec, regexp, argc, argv.start()), Object);
if (!result->IsJSReceiver() && !result->IsNull(isolate)) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kInvalidRegExpExecResult),
Object);
}
return result;
}
if (!regexp->IsJSRegExp()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
isolate->factory()->NewStringFromAsciiChecked(
"RegExp.prototype.exec"),
regexp),
Object);
}
{
Handle<JSFunction> regexp_exec = isolate->regexp_exec_function();
const int argc = 1;
ScopedVector<Handle<Object>> argv(argc);
argv[0] = string;
return Execution::Call(isolate, regexp_exec, regexp, argc, argv.start());
}
}
Maybe<bool> RegExpUtils::IsRegExp(Isolate* isolate, Handle<Object> object) {
if (!object->IsJSReceiver()) return Just(false);
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
if (isolate->regexp_function()->initial_map() == receiver->map()) {
// Fast-path for unmodified JSRegExp instances.
// TODO(ishell): Adapt for new fast-path logic.
return Just(true);
}
Handle<Object> match;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, match,
JSObject::GetProperty(receiver, isolate->factory()->match_symbol()),
Nothing<bool>());
if (!match->IsUndefined(isolate)) return Just(match->BooleanValue());
return Just(object->IsJSRegExp());
}
bool RegExpUtils::IsUnmodifiedRegExp(Isolate* isolate, Handle<Object> obj) {
// TODO(ishell): Update this check once map changes for constant field
// tracking are landing.
if (!obj->IsJSReceiver()) return false;
JSReceiver* recv = JSReceiver::cast(*obj);
// Check the receiver's map.
Handle<JSFunction> regexp_function = isolate->regexp_function();
if (recv->map() != regexp_function->initial_map()) return false;
// Check the receiver's prototype's map.
Object* proto = recv->map()->prototype();
if (!proto->IsJSReceiver()) return false;
Handle<Map> initial_proto_initial_map = isolate->regexp_prototype_map();
return (JSReceiver::cast(proto)->map() == *initial_proto_initial_map);
}
int RegExpUtils::AdvanceStringIndex(Isolate* isolate, Handle<String> string,
int index, bool unicode) {
if (unicode && index < string->length()) {
const uint16_t first = string->Get(index);
if (first >= 0xD800 && first <= 0xDBFF && string->length() > index + 1) {
const uint16_t second = string->Get(index + 1);
if (second >= 0xDC00 && second <= 0xDFFF) {
return index + 2;
}
}
}
return index + 1;
}
MaybeHandle<Object> RegExpUtils::SetAdvancedStringIndex(
Isolate* isolate, Handle<JSReceiver> regexp, Handle<String> string,
bool unicode) {
Handle<Object> last_index_obj;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, last_index_obj,
Object::GetProperty(regexp, isolate->factory()->lastIndex_string()),
Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, last_index_obj,
Object::ToLength(isolate, last_index_obj), Object);
const int last_index = Handle<Smi>::cast(last_index_obj)->value();
const int new_last_index =
AdvanceStringIndex(isolate, string, last_index, unicode);
return SetLastIndex(isolate, regexp, new_last_index);
}
} // namespace internal
} // namespace v8
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