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#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeString.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionFactory.h>
#include <base/find_symbols.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ILLEGAL_COLUMN;
}
class FunctionCutURLParameter : public IFunction
{
public:
static constexpr auto name = "cutURLParameter";
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCutURLParameter>(); }
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 2; }
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
if (!isString(arguments[0]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument of function {}",
arguments[0]->getName(), getName());
if (!isString(arguments[1]) && !isArray(arguments[1]))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument of function {}",
arguments[1]->getName(), getName());
return std::make_shared<DataTypeString>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
const ColumnPtr column = arguments[0].column;
const ColumnPtr column_needle = arguments[1].column;
const ColumnConst * col_needle = typeid_cast<const ColumnConst *>(&*column_needle);
const ColumnArray * col_needle_const_array = checkAndGetColumnConstData<ColumnArray>(column_needle.get());
if (!col_needle && !col_needle_const_array)
throw Exception(ErrorCodes::ILLEGAL_COLUMN,
"Second argument of function {} must be constant string or constant array",
getName());
if (col_needle_const_array)
{
if (!col_needle_const_array->getData().empty() && typeid_cast<const DataTypeArray &>(*arguments[1].type).getNestedType()->getTypeId() != TypeIndex::String)
throw Exception(ErrorCodes::ILLEGAL_COLUMN,
"Second argument of function {} must be constant array of strings",
getName());
}
if (const ColumnString * col = checkAndGetColumn<ColumnString>(column.get()))
{
auto col_res = ColumnString::create();
ColumnString::Chars & vec_res = col_res->getChars();
ColumnString::Offsets & offsets_res = col_res->getOffsets();
vector(col->getChars(), col->getOffsets(), col_needle, col_needle_const_array, vec_res, offsets_res);
return col_res;
}
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN,
"Illegal column {} of argument of function {}",
arguments[0].column->getName(), getName());
}
static void cutURL(ColumnString::Chars & data, String pattern, size_t prev_offset, size_t & cur_offset)
{
pattern += '=';
const char * param_str = pattern.c_str();
size_t param_len = pattern.size();
const char * url_begin = reinterpret_cast<const char *>(&data[prev_offset]);
const char * url_end = reinterpret_cast<const char *>(&data[cur_offset - 2]);
const char * begin_pos = url_begin;
const char * end_pos = begin_pos;
do
{
const char * query_string_begin = find_first_symbols<'?', '#'>(url_begin, url_end);
if (query_string_begin + 1 >= url_end)
break;
const char * pos = static_cast<const char *>(memmem(query_string_begin + 1, url_end - query_string_begin - 1, param_str, param_len));
if (pos == nullptr)
break;
if (pos[-1] != '?' && pos[-1] != '#' && pos[-1] != '&')
{
pos = nullptr;
break;
}
begin_pos = pos;
end_pos = begin_pos + param_len;
/// Skip the value.
while (*end_pos && *end_pos != '&' && *end_pos != '#')
++end_pos;
/// Capture '&' before or after the parameter.
if (*end_pos == '&')
++end_pos;
else if (begin_pos[-1] == '&')
--begin_pos;
} while (false);
size_t cut_length = end_pos - begin_pos;
cur_offset -= cut_length;
data.erase(data.begin() + prev_offset + (begin_pos - url_begin), data.begin() + prev_offset+ (end_pos - url_begin));
}
static void vector(const ColumnString::Chars & data,
const ColumnString::Offsets & offsets,
const ColumnConst * col_needle,
const ColumnArray * col_needle_const_array,
ColumnString::Chars & res_data, ColumnString::Offsets & res_offsets)
{
res_data.reserve(data.size());
res_offsets.resize(offsets.size());
size_t prev_offset = 0;
size_t cur_offset;
size_t cur_len;
size_t res_offset = 0;
size_t cur_res_offset;
for (size_t i = 0; i < offsets.size(); ++i)
{
cur_offset = offsets[i];
cur_len = cur_offset - prev_offset;
cur_res_offset = res_offset + cur_len;
res_data.resize(cur_res_offset);
memcpySmallAllowReadWriteOverflow15(&res_data[res_offset], &data[prev_offset], cur_len);
if (col_needle_const_array)
{
size_t num_needles = col_needle_const_array->getData().size();
for (size_t j = 0; j < num_needles; ++j)
{
auto field = col_needle_const_array->getData()[j];
cutURL(res_data, field.get<String>(), res_offset, cur_res_offset);
}
}
else
{
cutURL(res_data, col_needle->getValue<String>(), res_offset, cur_res_offset);
}
res_offsets[i] = cur_res_offset;
res_offset = cur_res_offset;
prev_offset = cur_offset;
}
}
};
REGISTER_FUNCTION(CutURLParameter)
{
factory.registerFunction<FunctionCutURLParameter>();
}
}
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