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