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LibJS: Hook up Regex<ECMA262> to RegExpObject and implement `test()'

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This makes RegExpObject compile and store a Regex<ECMA262>, adds
all flag-related properties, and implements `RegExpPrototype.test()`
(complete with 'lastIndex' support) :^)
It should be noted that this only implements `test()' using the builtin
`exec()'.
This commit is contained in:
AnotherTest 2020-11-19 01:50:00 +03:30 • committed by Andreas Kling
parent 75081b2bdd
commit 8ba273a2f3
13 changed files with 396 additions and 12 deletions
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118
Libraries/LibJS/Runtime/RegExpObject.cpp
View file

@ -24,6 +24,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Function.h>
#include <AK/StringBuilder.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Runtime/GlobalObject.h>
@ -33,6 +34,73 @@
namespace JS {
static Flags options_from(const String& flags, VM& vm, GlobalObject& global_object)
{
bool g = false, i = false, m = false, s = false, u = false, y = false;
Flags options {
{ (regex::ECMAScriptFlags)regex::AllFlags::Global }, // JS regexps are all 'global' by default as per our definition, but the "global" flag enables "stateful".
{},
};
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());
@ -42,11 +110,61 @@ RegExpObject::RegExpObject(String pattern, String flags, Object& prototype)
: Object(prototype)
, m_pattern(pattern)
, m_flags(flags)
, m_active_flags(options_from(m_flags, this->vm(), this->global_object()))
, 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 (!this_object->is_regexp_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;
}
}