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#include <cstdlib>
#include <base/find_symbols.h>
#include <Processors/Formats/Impl/RegexpRowInputFormat.h>
#include <DataTypes/Serializations/SerializationNullable.h>
#include <Formats/EscapingRuleUtils.h>
#include <Formats/SchemaInferenceUtils.h>
#include <IO/ReadHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int INCORRECT_DATA;
extern const int LOGICAL_ERROR;
}
RegexpFieldExtractor::RegexpFieldExtractor(const FormatSettings & format_settings) : regexp(format_settings.regexp.regexp), skip_unmatched(format_settings.regexp.skip_unmatched)
{
size_t fields_count = regexp.NumberOfCapturingGroups();
matched_fields.resize(fields_count);
re2_arguments.resize(fields_count);
re2_arguments_ptrs.resize(fields_count);
for (size_t i = 0; i != fields_count; ++i)
{
// Bind an argument to a matched field.
re2_arguments[i] = &matched_fields[i];
// Save pointer to argument.
re2_arguments_ptrs[i] = &re2_arguments[i];
}
}
bool RegexpFieldExtractor::parseRow(PeekableReadBuffer & buf)
{
PeekableReadBufferCheckpoint checkpoint{buf};
size_t line_size = 0;
do
{
char * pos = find_first_symbols<'\n'>(buf.position(), buf.buffer().end());
line_size += pos - buf.position();
buf.position() = pos;
} while (buf.position() == buf.buffer().end() && !buf.eof());
buf.makeContinuousMemoryFromCheckpointToPos();
buf.rollbackToCheckpoint();
/// Allow DOS line endings.
size_t line_to_match = line_size;
if (line_size > 0 && buf.position()[line_size - 1] == '\r')
--line_to_match;
bool match = re2_st::RE2::FullMatchN(
re2_st::StringPiece(buf.position(), line_to_match),
regexp,
re2_arguments_ptrs.data(),
static_cast<int>(re2_arguments_ptrs.size()));
if (!match && !skip_unmatched)
throw Exception(ErrorCodes::INCORRECT_DATA, "Line \"{}\" doesn't match the regexp.",
std::string(buf.position(), line_to_match));
buf.position() += line_size;
if (!buf.eof() && !checkChar('\n', buf))
throw Exception(ErrorCodes::LOGICAL_ERROR, "No \\n at the end of line.");
return match;
}
RegexpRowInputFormat::RegexpRowInputFormat(
ReadBuffer & in_, const Block & header_, Params params_, const FormatSettings & format_settings_)
: RegexpRowInputFormat(std::make_unique<PeekableReadBuffer>(in_), header_, params_, format_settings_)
{
}
RegexpRowInputFormat::RegexpRowInputFormat(
std::unique_ptr<PeekableReadBuffer> buf_, const Block & header_, Params params_, const FormatSettings & format_settings_)
: IRowInputFormat(header_, *buf_, std::move(params_))
, buf(std::move(buf_))
, format_settings(format_settings_)
, escaping_rule(format_settings_.regexp.escaping_rule)
, field_extractor(RegexpFieldExtractor(format_settings_))
{
}
void RegexpRowInputFormat::resetParser()
{
IRowInputFormat::resetParser();
buf->reset();
}
bool RegexpRowInputFormat::readField(size_t index, MutableColumns & columns)
{
const auto & type = getPort().getHeader().getByPosition(index).type;
auto matched_field = field_extractor.getField(index);
ReadBuffer field_buf(const_cast<char *>(matched_field.data()), matched_field.size(), 0);
try
{
return deserializeFieldByEscapingRule(type, serializations[index], *columns[index], field_buf, escaping_rule, format_settings);
}
catch (Exception & e)
{
e.addMessage("(while reading the value of column " + getPort().getHeader().getByPosition(index).name + ")");
throw;
}
}
void RegexpRowInputFormat::readFieldsFromMatch(MutableColumns & columns, RowReadExtension & ext)
{
if (field_extractor.getMatchedFieldsSize() != columns.size())
throw Exception(ErrorCodes::INCORRECT_DATA, "The number of matched fields in line doesn't match the number of columns.");
ext.read_columns.assign(columns.size(), false);
for (size_t columns_index = 0; columns_index < columns.size(); ++columns_index)
{
ext.read_columns[columns_index] = readField(columns_index, columns);
}
}
bool RegexpRowInputFormat::readRow(MutableColumns & columns, RowReadExtension & ext)
{
if (buf->eof())
return false;
if (field_extractor.parseRow(*buf))
readFieldsFromMatch(columns, ext);
return true;
}
void RegexpRowInputFormat::setReadBuffer(ReadBuffer & in_)
{
buf->setSubBuffer(in_);
}
RegexpSchemaReader::RegexpSchemaReader(ReadBuffer & in_, const FormatSettings & format_settings_)
: IRowSchemaReader(
buf,
format_settings_,
getDefaultDataTypeForEscapingRule(format_settings_.regexp.escaping_rule))
, field_extractor(format_settings)
, buf(in_)
{
}
std::optional<DataTypes> RegexpSchemaReader::readRowAndGetDataTypes()
{
if (buf.eof())
return {};
field_extractor.parseRow(buf);
DataTypes data_types;
data_types.reserve(field_extractor.getMatchedFieldsSize());
for (size_t i = 0; i != field_extractor.getMatchedFieldsSize(); ++i)
{
String field(field_extractor.getField(i));
data_types.push_back(tryInferDataTypeByEscapingRule(field, format_settings, format_settings.regexp.escaping_rule, &json_inference_info));
}
return data_types;
}
void RegexpSchemaReader::transformTypesIfNeeded(DataTypePtr & type, DataTypePtr & new_type)
{
transformInferredTypesByEscapingRuleIfNeeded(type, new_type, format_settings, format_settings.regexp.escaping_rule, &json_inference_info);
}
void registerInputFormatRegexp(FormatFactory & factory)
{
factory.registerInputFormat("Regexp", [](
ReadBuffer & buf,
const Block & sample,
IRowInputFormat::Params params,
const FormatSettings & settings)
{
return std::make_shared<RegexpRowInputFormat>(buf, sample, std::move(params), settings);
});
}
static std::pair<bool, size_t> segmentationEngine(ReadBuffer & in, DB::Memory<> & memory, size_t min_bytes, size_t max_rows)
{
char * pos = in.position();
bool need_more_data = true;
size_t number_of_rows = 0;
while (loadAtPosition(in, memory, pos) && need_more_data)
{
pos = find_first_symbols<'\r', '\n'>(pos, in.buffer().end());
if (pos > in.buffer().end())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Position in buffer is out of bounds. There must be a bug.");
else if (pos == in.buffer().end())
continue;
++number_of_rows;
if ((memory.size() + static_cast<size_t>(pos - in.position()) >= min_bytes) || (number_of_rows == max_rows))
need_more_data = false;
if (*pos == '\n')
{
++pos;
if (loadAtPosition(in, memory, pos) && *pos == '\r')
++pos;
}
else if (*pos == '\r')
{
++pos;
if (loadAtPosition(in, memory, pos) && *pos == '\n')
++pos;
}
}
saveUpToPosition(in, memory, pos);
return {loadAtPosition(in, memory, pos), number_of_rows};
}
void registerFileSegmentationEngineRegexp(FormatFactory & factory)
{
factory.registerFileSegmentationEngine("Regexp", &segmentationEngine);
}
void registerRegexpSchemaReader(FormatFactory & factory)
{
factory.registerSchemaReader("Regexp", [](ReadBuffer & buf, const FormatSettings & settings)
{
return std::make_shared<RegexpSchemaReader>(buf, settings);
});
factory.registerAdditionalInfoForSchemaCacheGetter("Regexp", [](const FormatSettings & settings)
{
auto result = getAdditionalFormatInfoByEscapingRule(settings, settings.regexp.escaping_rule);
return result + fmt::format(", regexp={}", settings.regexp.regexp);
});
}
}
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