Class: SQLPP::Formatter

Inherits:
Object
  • Object
show all
Defined in:
lib/sqlpp/formatter.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Formatter

Returns a new instance of Formatter.



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# File 'lib/sqlpp/formatter.rb', line 3

def initialize
  @indent = nil
  @state = nil
end

Instance Method Details

#_format_Alias(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 127

def _format_Alias(node)
  format(node.expr) + " " + format(node.name)
end

#_format_As(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 123

def _format_As(node)
  format(node.expr) + " AS " + format(node.name)
end

#_format_Atom(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 83

def _format_Atom(node)
  output = ""

  case node.type
    when :range
      output << format(node.left) << " AND " << format(node.right)
    when :list
      output << "(" << node.left.map { |c| format(c) }.join(", ") << ")"
    when :func
      output << format(node.left) << "("
      output << node.right.map { |c| format(c) }.join(", ")
      output << ")"
    when :lit
      output << node.left
    when :attr
      output << node.left
      output << "." << node.right if node.right
    when :case
      output << "CASE "
      output << format(node.left) << " " if node.left
      node.right.each do |child|
        if child.is_a?(Array)
          output << "WHEN " << format(child[0]) << " "
          output << "THEN " << format(child[1]) << " "
        else
          output << "ELSE " << format(child) << " "
        end
      end
      output << "END"
    else
      raise ArgumentError, "unknown atom type #{node.type.inspect}"
  end

  output
end

#_format_Expr(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 59

def _format_Expr(node)
  output = format(node.left)
  if node.op
    op = node.op.to_s.upcase

    if @state == :where && %w(AND OR).include?(op)
      output << "\n#{_indent}"
    else
      output << " "
    end

    output << op << " "
    output << format(node.right)
  end
  output
end

#_format_Join(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 131

def _format_Join(node)
  output = ""

  output << format(node.left)
  output << "\n#{_indent}"
  output << node.type.upcase << " JOIN "
  output << format(node.right)
  output << "\n#{_indent}ON " << format(node.on) if node.on

  output
end

#_format_Parens(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 119

def _format_Parens(node)
  "(" + format(node.value) + ")"
end

#_format_Select(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 13

def _format_Select(node)
  output = ""

  if @indent.nil?
    @indent = 0
  else
    @indent += 2
    output << "\n"
  end

  output << "#{_indent}SELECT "
  output << node.projections.map { |c| format(c) }.join(", ")
  output << "\n"

  if node.froms
    output << "#{_indent}FROM "
    output << node.froms.map { |c| format(c) }.join(", ")
    output << "\n"
  end

  if node.wheres
    save, @state = @state, :where
    output << "#{_indent}WHERE "
    output << format(node.wheres)
    output << "\n"
    @state = save
  end

  if node.groups
    output << "#{_indent}GROUP BY "
    output << node.groups.map { |c| format(c) }.join(", ")
    output << "\n"
  end

  if node.orders
    output << "#{_indent}ORDER BY "
    output << node.orders.map { |c| format(c) }.join(", ")
    output << "\n"
  end

  @indent -= 2
  @indent = nil if @indent < 0

  output << _indent
end

#_format_SortKey(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 143

def _format_SortKey(node)
  output = ""
  output << format(node.key)

  if node.options.any?
    output << " "
    output << node.options.map { |opt| opt.upcase }.join(", ")
  end

  output
end

#_format_String(string) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 155

def _format_String(string)
  string
end

#_format_Unary(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 76

def _format_Unary(node)
  op = node.op.to_s.upcase
  output = op
  output << " " if op =~ /\w/
  output << format(node.expr)
end

#_indent ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 159

def _indent
  " " * (@indent || 0)
end

#format(node) ⇒ Object 



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# File 'lib/sqlpp/formatter.rb', line 8

def format(node)
  name = node.class.to_s.split(/::/).last
  send(:"_format_#{name}", node)
end