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#include <Formats/ParsedTemplateFormatString.h>
#include <Formats/verbosePrintString.h>
#include <Formats/EscapingRuleUtils.h>
#include <IO/ReadBufferFromMemory.h>
#include <IO/Operators.h>
#include <IO/ReadBufferFromFile.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
extern const int INVALID_TEMPLATE_FORMAT;
}
ParsedTemplateFormatString::ParsedTemplateFormatString(const FormatSchemaInfo & schema, const ColumnIdxGetter & idx_by_name, bool allow_indexes)
{
ReadBufferFromFile schema_file(schema.absoluteSchemaPath(), 4096);
String format_string;
readStringUntilEOF(format_string, schema_file);
try
{
parse(format_string, idx_by_name, allow_indexes);
}
catch (DB::Exception & e)
{
if (e.code() != ErrorCodes::INVALID_TEMPLATE_FORMAT)
throwInvalidFormat(e.message(), columnsCount());
else
throw;
}
}
void ParsedTemplateFormatString::parse(const String & format_string, const ColumnIdxGetter & idx_by_name, bool allow_indexes)
{
enum ParserState
{
Delimiter,
Column,
Format
};
const char * pos = format_string.c_str();
const char * end = format_string.c_str() + format_string.size();
const char * token_begin = pos;
ParserState state = Delimiter;
delimiters.emplace_back();
char * col_idx_end;
std::optional<size_t> column_idx;
for (; *pos; ++pos)
{
switch (state)
{
case Delimiter:
if (*pos == '$')
{
delimiters.back().append(token_begin, pos - token_begin);
++pos;
if (*pos == '{')
{
token_begin = pos + 1;
state = Column;
}
else if (*pos == '$')
{
token_begin = pos;
}
else
throwInvalidFormat("At pos " + std::to_string(pos - format_string.c_str()) +
": Expected '{' or '$' after '$'" +
", got \"" + std::string(pos, std::min(end - pos, 16l)) + "\"", columnsCount());
}
break;
case Column:
column_names.emplace_back();
pos = readMayBeQuotedColumnNameInto(pos, end - pos, column_names.back());
if (*pos == ':')
state = Format;
else if (*pos == '}')
{
escaping_rules.push_back(EscapingRule::None);
delimiters.emplace_back();
state = Delimiter;
}
else
throwInvalidFormat("At pos " + std::to_string(pos - format_string.c_str()) +
": Expected ':' or '}' after column name \"" + column_names.back() + "\"" +
", got \"" + std::string(pos, std::min(end - pos, 16l)) + "\"", columnsCount());
token_begin = pos + 1;
column_idx.reset();
if (!column_names.back().empty())
{
col_idx_end = nullptr;
errno = 0;
column_idx = strtoull(column_names.back().c_str(), &col_idx_end, 10);
if (col_idx_end != column_names.back().c_str() + column_names.back().size() || errno)
column_idx = idx_by_name(column_names.back());
else if (!allow_indexes)
throw Exception(ErrorCodes::INVALID_TEMPLATE_FORMAT, "Indexes instead of names are not allowed");
}
format_idx_to_column_idx.emplace_back(column_idx);
break;
case Format:
if (*pos == '}')
{
escaping_rules.push_back(stringToEscapingRule(String(token_begin, pos - token_begin)));
token_begin = pos + 1;
delimiters.emplace_back();
state = Delimiter;
}
}
}
if (state != Delimiter)
throwInvalidFormat("Unbalanced parentheses", columnsCount());
delimiters.back().append(token_begin, pos - token_begin);
}
size_t ParsedTemplateFormatString::columnsCount() const
{
return format_idx_to_column_idx.size();
}
const char * ParsedTemplateFormatString::readMayBeQuotedColumnNameInto(const char * pos, size_t size, String & s)
{
s.clear();
if (!size)
return pos;
ReadBufferFromMemory buf{pos, size};
if (*pos == '"')
readDoubleQuotedStringWithSQLStyle(s, buf);
else if (*pos == '`')
readBackQuotedStringWithSQLStyle(s, buf);
else if (isWordCharASCII(*pos))
{
size_t name_size = 1;
while (name_size < size && isWordCharASCII(*(pos + name_size)))
++name_size;
s = String{pos, name_size};
return pos + name_size;
}
return pos + buf.count();
}
String ParsedTemplateFormatString::dump() const
{
WriteBufferFromOwnString res;
res << "\nDelimiter " << 0 << ": ";
verbosePrintString(delimiters.front().c_str(), delimiters.front().c_str() + delimiters.front().size(), res);
size_t num_columns = std::max(escaping_rules.size(), format_idx_to_column_idx.size());
for (size_t i = 0; i < num_columns; ++i)
{
res << "\nColumn " << i << ": \"";
if (column_names.size() <= i)
res << "<ERROR>";
else if (column_names[i].empty())
res << "<SKIPPED>";
else
res << column_names[i];
res << "\" (mapped to table column ";
if (format_idx_to_column_idx.size() <= i)
res << "<ERROR>";
else if (!format_idx_to_column_idx[i])
res << "<SKIPPED>";
else
res << *format_idx_to_column_idx[i];
res << "), Format " << (i < escaping_rules.size() ? escapingRuleToString(escaping_rules[i]) : "<ERROR>");
res << "\nDelimiter " << i + 1 << ": ";
if (delimiters.size() <= i + 1)
res << "<ERROR>";
else
verbosePrintString(delimiters[i + 1].c_str(), delimiters[i + 1].c_str() + delimiters[i + 1].size(), res);
}
return res.str();
}
void ParsedTemplateFormatString::throwInvalidFormat(const String & message, size_t column) const
{
throw Exception(ErrorCodes::INVALID_TEMPLATE_FORMAT, "Invalid format string for Template: {} (near column {}). "
"Parsed format string:\n{}\n", message, std::to_string(column), dump());
}
}
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