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#include "./wrapped_re2.h"
#include <vector>
NAN_METHOD(WrappedRE2::Match)
{
// unpack arguments
auto re2 = Nan::ObjectWrap::Unwrap<WrappedRE2>(info.This());
if (!re2)
{
info.GetReturnValue().SetNull();
return;
}
PrepareLastString prep(re2, info[0]);
StrVal& str = prep;
if (str.isBad) return; // throws an exception
if (!str.isValidIndex)
{
re2->lastIndex = 0;
info.GetReturnValue().SetNull();
return;
}
std::vector<re2::StringPiece> groups;
size_t byteIndex = 0;
auto anchor = re2::RE2::UNANCHORED;
// actual work
if (re2->global)
{
// global: collect all matches
re2::StringPiece match;
if (re2->sticky)
{
anchor = re2::RE2::ANCHOR_START;
}
while (re2->regexp.Match(str, byteIndex, str.size, anchor, &match, 1))
{
groups.push_back(match);
byteIndex = match.data() - str.data + match.size();
}
if (groups.empty())
{
info.GetReturnValue().SetNull();
return;
}
}
else
{
// non-global: just like exec()
if (re2->sticky)
{
byteIndex = str.byteIndex;
anchor = RE2::ANCHOR_START;
}
groups.resize(re2->regexp.NumberOfCapturingGroups() + 1);
if (!re2->regexp.Match(str, byteIndex, str.size, anchor, &groups[0], groups.size()))
{
if (re2->sticky)
re2->lastIndex = 0;
info.GetReturnValue().SetNull();
return;
}
}
// form a result
auto result = Nan::New<v8::Array>(), indices = Nan::New<v8::Array>();
if (str.isBuffer)
{
for (size_t i = 0, n = groups.size(); i < n; ++i)
{
const auto &item = groups[i];
const auto data = item.data();
if (data)
{
Nan::Set(result, i, Nan::CopyBuffer(data, item.size()).ToLocalChecked());
if (!re2->global && re2->hasIndices)
{
auto pair = Nan::New<v8::Array>();
auto offset = data - str.data - byteIndex;
auto length = item.size();
Nan::Set(pair, 0, Nan::New<v8::Integer>(static_cast<int>(offset)));
Nan::Set(pair, 1, Nan::New<v8::Integer>(static_cast<int>(offset + length)));
Nan::Set(indices, i, pair);
}
}
else
{
Nan::Set(result, i, Nan::Undefined());
if (!re2->global && re2->hasIndices)
Nan::Set(indices, i, Nan::Undefined());
}
}
if (!re2->global)
{
Nan::Set(result, Nan::New("index").ToLocalChecked(), Nan::New<v8::Integer>(static_cast<int>(groups[0].data() - str.data)));
Nan::Set(result, Nan::New("input").ToLocalChecked(), info[0]);
}
}
else
{
for (size_t i = 0, n = groups.size(); i < n; ++i)
{
const auto &item = groups[i];
const auto data = item.data();
if (data)
{
Nan::Set(result, i, Nan::New(data, item.size()).ToLocalChecked());
if (!re2->global && re2->hasIndices)
{
auto pair = Nan::New<v8::Array>();
auto offset = getUtf16Length(str.data + byteIndex, data);
auto length = getUtf16Length(data, data + item.size());
Nan::Set(pair, 0, Nan::New<v8::Integer>(static_cast<int>(offset)));
Nan::Set(pair, 1, Nan::New<v8::Integer>(static_cast<int>(offset + length)));
Nan::Set(indices, i, pair);
}
}
else
{
Nan::Set(result, i, Nan::Undefined());
if (!re2->global && re2->hasIndices)
{
Nan::Set(indices, i, Nan::Undefined());
}
}
}
if (!re2->global)
{
Nan::Set(result, Nan::New("index").ToLocalChecked(), Nan::New<v8::Integer>(static_cast<int>(getUtf16Length(str.data, groups[0].data()))));
Nan::Set(result, Nan::New("input").ToLocalChecked(), info[0]);
}
}
if (re2->global)
{
re2->lastIndex = 0;
}
else if (re2->sticky)
{
re2->lastIndex +=
str.isBuffer ? groups[0].data() - str.data + groups[0].size() - byteIndex : getUtf16Length(str.data + byteIndex, groups[0].data() + groups[0].size());
}
if (!re2->global)
{
const auto &groupNames = re2->regexp.CapturingGroupNames();
if (!groupNames.empty())
{
auto groups = Nan::New<v8::Object>();
Nan::SetPrototype(groups, Nan::Null());
for (auto group : groupNames)
{
auto value = Nan::Get(result, group.first);
if (!value.IsEmpty())
{
Nan::Set(groups, Nan::New(group.second).ToLocalChecked(), value.ToLocalChecked());
}
}
Nan::Set(result, Nan::New("groups").ToLocalChecked(), groups);
if (re2->hasIndices)
{
auto indexGroups = Nan::New<v8::Object>();
Nan::SetPrototype(indexGroups, Nan::Null());
for (auto group : groupNames)
{
auto value = Nan::Get(indices, group.first);
if (!value.IsEmpty())
{
Nan::Set(indexGroups, Nan::New(group.second).ToLocalChecked(), value.ToLocalChecked());
}
}
Nan::Set(indices, Nan::New("groups").ToLocalChecked(), indexGroups);
}
}
else
{
Nan::Set(result, Nan::New("groups").ToLocalChecked(), Nan::Undefined());
if (re2->hasIndices)
{
Nan::Set(indices, Nan::New("groups").ToLocalChecked(), Nan::Undefined());
}
}
if (re2->hasIndices)
{
Nan::Set(result, Nan::New("indices").ToLocalChecked(), indices);
}
}
info.GetReturnValue().Set(result);
}
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