Class: Atatus::Sql::Signature Private

Inherits:

Object

• Object
• Atatus::Sql::Signature

Includes:

Tokens

Defined in:

lib/atatus/sql/signature.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Defined Under Namespace

Classes: Summarizer

Constant Summary

Constants included from Tokens

Tokens::AS, Tokens::CALL, Tokens::COMMA, Tokens::COMMENT, Tokens::DELETE, Tokens::FROM, Tokens::IDENT, Tokens::INSERT, Tokens::INTO, Tokens::KEYWORDS, Tokens::KEYWORD_MAX_LENGTH, Tokens::KEYWORD_MIN_LENGTH, Tokens::LPAREN, Tokens::NUMBER, Tokens::OR, Tokens::OTHER, Tokens::PERIOD, Tokens::REPLACE, Tokens::RPAREN, Tokens::SELECT, Tokens::SET, Tokens::STRING, Tokens::TABLE, Tokens::TRUNCATE, Tokens::UPDATE

Class Method Summary

• .parse(sql) ⇒ Object private

Instance Method Summary

• #initialize(sql) ⇒ Signature constructor private

  A new instance of Signature.

• #parse ⇒ Object private

Constructor Details

#initialize(sql) ⇒ Signature

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Signature.

# File 'lib/atatus/sql/signature.rb', line 38

def initialize(sql)
  @sql = sql.encode('utf-8', invalid: :replace, undef: :replace)
  @tokenizer = Tokenizer.new(@sql)
end

Class Method Details

.parse(sql) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

# File 'lib/atatus/sql/signature.rb', line 56

def self.parse(sql)
  new(sql).parse
end

Instance Method Details

#parse ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

# File 'lib/atatus/sql/signature.rb', line 43

def parse
  @tokenizer.scan # until tokenizer.token != COMMENT

  parsed = parse_tokens
  return parsed if parsed

  # If all else fails, just return the first token of the query.
  parts = @sql.split
  return '' unless parts.any?

  parts.first.upcase
end