Class: SqlBeautifier::CaseExpression

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

Constant Summary collapse

CASE_KEYWORD = 
"case"
WHEN_KEYWORD = 
"when"
THEN_KEYWORD = 
"then"
ELSE_KEYWORD = 
"else"
END_KEYWORD = 
"end"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.format_in_text(text, base_indent: 0) ⇒ Object 



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# File 'lib/sql_beautifier/case_expression.rb', line 16

def self.format_in_text(text, base_indent: 0)
  output = +""
  scanner = Scanner.new(text)

  while scanner.position < text.length
    consumed = scanner.scan_quoted_or_sentinel!
    if consumed
      output << consumed
      next
    end

    if scanner.current_char == Constants::OPEN_PARENTHESIS
      scanner.increment_depth!
      output << scanner.current_char
      scanner.advance!
      next
    end

    if scanner.current_char == Constants::CLOSE_PARENTHESIS
      scanner.decrement_depth!
      output << scanner.current_char
      scanner.advance!
      next
    end

    if scanner.parenthesis_depth.zero? && scanner.keyword_at?(CASE_KEYWORD)
      case_start = scanner.position
      end_position = find_matching_end(text, case_start)

      unless end_position
        output << scanner.current_char
        scanner.advance!
        next
      end

      case_text = text[case_start...(end_position + END_KEYWORD.length)]
      parsed = parse(case_text, base_indent: base_indent)
      output << (parsed ? parsed.render : case_text)

      scanner.advance!(end_position + END_KEYWORD.length - scanner.position)
      next
    end

    output << scanner.current_char
    scanner.advance!
  end

  output
end

.parse(text, base_indent: 0) ⇒ Object 



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# File 'lib/sql_beautifier/case_expression.rb', line 66

def self.parse(text, base_indent: 0)
  stripped = text.strip
  scanner = Scanner.new(stripped)
  return nil unless scanner.keyword_at?(CASE_KEYWORD)

  scanner.skip_past_keyword!(CASE_KEYWORD)

  operand = extract_operand(stripped, scanner)
  when_clauses = []
  else_value = nil
  case_depth = 1

  until scanner.finished?
    consumed = scanner.scan_quoted_or_sentinel!
    next if consumed

    if scanner.current_char == Constants::OPEN_PARENTHESIS
      scanner.increment_depth!
      scanner.advance!
      next
    end

    if scanner.current_char == Constants::CLOSE_PARENTHESIS
      scanner.decrement_depth!
      scanner.advance!
      next
    end

    if scanner.parenthesis_depth.zero?
      if scanner.keyword_at?(CASE_KEYWORD)
        case_depth += 1
        scanner.advance!(CASE_KEYWORD.length)
        next
      end

      if scanner.keyword_at?(END_KEYWORD)
        case_depth -= 1

        if case_depth.zero?
          return new(
            operand: operand,
            when_clauses: when_clauses,
            else_value: else_value,
            base_indent: base_indent
          )
        end

        scanner.advance!(END_KEYWORD.length)
        next
      end

      if case_depth == 1
        if scanner.keyword_at?(WHEN_KEYWORD)
          parsed_clause = parse_when_clause(stripped, scanner)
          return nil unless parsed_clause

          when_clauses << parsed_clause
          next
        end

        if scanner.keyword_at?(ELSE_KEYWORD)
          else_value = parse_else_value(stripped, scanner)
          next
        end
      end
    end

    scanner.advance!
  end

  nil
end

Instance Method Details

#render ⇒ Object 



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# File 'lib/sql_beautifier/case_expression.rb', line 139

def render
  inline_version = render_inline
  threshold = SqlBeautifier.config_for(:inline_group_threshold)

  return inline_version if inline_version.length <= threshold

  render_expanded
end