Class: SqlBeautifier::Normalizer

Inherits:
Object
  • Object
show all
Defined in:
lib/sql_beautifier/normalizer.rb

Constant Summary collapse

SAFE_UNQUOTED_IDENTIFIER = 
%r{\A[[:lower:]_][[:lower:][:digit:]_]*\z}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value) ⇒ Normalizer

Returns a new instance of Normalizer.



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# File 'lib/sql_beautifier/normalizer.rb', line 11

def initialize(value)
  @value = value
end

Class Method Details

.call ⇒ Object 



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# File 'lib/sql_beautifier/normalizer.rb', line 7

def self.call(...)
  new(...).call
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/sql_beautifier/normalizer.rb', line 15

def call
  return unless @value.present?

  @source = @value.strip
  return unless @source.present?

  @source = strip_trailing_semicolons(@source)
  @source = @source.strip
  return unless @source.present?

  @scanner = Scanner.new(@source)
  @output = +""

  until @scanner.finished?
    if @scanner.sentinel_at?
      @output << @scanner.consume_sentinel!
      next
    end

    case @scanner.current_char
    when Constants::SINGLE_QUOTE
      consume_string_literal!

    when Constants::DOUBLE_QUOTE
      consume_quoted_identifier!

    when Constants::WHITESPACE_CHARACTER_REGEX
      collapse_whitespace!

    else
      @output << @scanner.current_char.downcase
      @scanner.advance!
    end
  end

  @output
end