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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Function.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
static Flags options_from(GlobalObject& global_object, const String& flags)
{
auto& vm = global_object.vm();
bool g = false, i = false, m = false, s = false, u = false, y = false;
Flags options {
// JS regexps are all 'global' by default as per our definition, but the "global" flag enables "stateful".
// FIXME: Enable 'BrowserExtended' only if in a browser context.
.effective_flags = { (regex::ECMAScriptFlags)regex::AllFlags::Global | (regex::ECMAScriptFlags)regex::AllFlags::SkipTrimEmptyMatches | regex::ECMAScriptFlags::BrowserExtended },
.declared_flags = {},
};
for (auto ch : flags) {
switch (ch) {
case 'g':
if (g)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
g = true;
options.effective_flags |= regex::ECMAScriptFlags::Global;
options.declared_flags |= regex::ECMAScriptFlags::Global;
break;
case 'i':
if (i)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
i = true;
options.effective_flags |= regex::ECMAScriptFlags::Insensitive;
options.declared_flags |= regex::ECMAScriptFlags::Insensitive;
break;
case 'm':
if (m)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
m = true;
options.effective_flags |= regex::ECMAScriptFlags::Multiline;
options.declared_flags |= regex::ECMAScriptFlags::Multiline;
break;
case 's':
if (s)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
s = true;
options.effective_flags |= regex::ECMAScriptFlags::SingleLine;
options.declared_flags |= regex::ECMAScriptFlags::SingleLine;
break;
case 'u':
if (u)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
u = true;
options.effective_flags |= regex::ECMAScriptFlags::Unicode;
options.declared_flags |= regex::ECMAScriptFlags::Unicode;
break;
case 'y':
if (y)
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectRepeatedFlag, ch);
y = true;
// Now for the more interesting flag, 'sticky' actually unsets 'global', part of which is the default.
options.effective_flags.reset_flag(regex::ECMAScriptFlags::Global);
// "What's the difference between sticky and global, then", that's simple.
// all the other flags imply 'global', and the "global" flag implies 'stateful';
// however, the "sticky" flag does *not* imply 'global', only 'stateful'.
options.effective_flags |= (regex::ECMAScriptFlags)regex::AllFlags::Internal_Stateful;
options.effective_flags |= regex::ECMAScriptFlags::Sticky;
options.declared_flags |= regex::ECMAScriptFlags::Sticky;
break;
default:
vm.throw_exception<SyntaxError>(global_object, ErrorType::RegExpObjectBadFlag, ch);
return options;
}
}
return options;
}
RegExpObject* RegExpObject::create(GlobalObject& global_object, String pattern, String flags)
{
return global_object.heap().allocate<RegExpObject>(global_object, pattern, flags, *global_object.regexp_prototype());
}
RegExpObject::RegExpObject(String pattern, String flags, Object& prototype)
: Object(prototype)
, m_pattern(pattern)
, m_flags(flags)
, m_active_flags(options_from(global_object(), m_flags))
, m_regex(pattern, m_active_flags.effective_flags)
{
if (m_regex.parser_result.error != regex::Error::NoError) {
vm().throw_exception<SyntaxError>(global_object(), ErrorType::RegExpCompileError, m_regex.error_string());
}
}
void RegExpObject::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
Object::initialize(global_object);
define_native_property(vm.names.lastIndex, last_index, set_last_index, Attribute::Writable);
}
RegExpObject::~RegExpObject()
{
}
static RegExpObject* regexp_object_from(VM& vm, GlobalObject& global_object)
{
auto* this_object = vm.this_value(global_object).to_object(global_object);
if (!this_object)
return nullptr;
if (!is<RegExpObject>(this_object)) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "RegExp");
return nullptr;
}
return static_cast<RegExpObject*>(this_object);
}
JS_DEFINE_NATIVE_GETTER(RegExpObject::last_index)
{
auto regexp_object = regexp_object_from(vm, global_object);
if (!regexp_object)
return {};
return Value((unsigned)regexp_object->regex().start_offset);
}
JS_DEFINE_NATIVE_SETTER(RegExpObject::set_last_index)
{
auto regexp_object = regexp_object_from(vm, global_object);
if (!regexp_object)
return;
auto index = value.to_i32(global_object);
if (vm.exception())
return;
if (index < 0)
index = 0;
regexp_object->regex().start_offset = index;
}
// 22.2.3.2.4 RegExpCreate ( P, F ), https://tc39.es/ecma262/#sec-regexpcreate
RegExpObject* regexp_create(GlobalObject& global_object, Value pattern, Value flags)
{
String p;
if (pattern.is_undefined()) {
p = String::empty();
} else {
p = pattern.to_string(global_object);
if (p.is_null())
return nullptr;
}
String f;
if (flags.is_undefined()) {
f = String::empty();
} else {
f = flags.to_string(global_object);
if (f.is_null())
return nullptr;
}
return RegExpObject::create(global_object, move(p), move(f));
}
}
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