Class: SQLTree::Node::FunctionExpression

Inherits:
Expression show all
Defined in:
lib/sql_tree/node/expression.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Expression

parse_atomic

Methods inherited from Base

[], #inspect, #quote_str, #quote_var

Constructor Details

#initialize(function, arguments = []) ⇒ FunctionExpression

Returns a new instance of FunctionExpression.



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# File 'lib/sql_tree/node/expression.rb', line 162

def initialize(function, arguments = [])
  @function = function
  @arguments = arguments
end

Instance Attribute Details

#arguments ⇒ Object

Returns the value of attribute arguments.



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# File 'lib/sql_tree/node/expression.rb', line 160

def arguments
  @arguments
end

#function ⇒ Object

Returns the value of attribute function.



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# File 'lib/sql_tree/node/expression.rb', line 160

def function
  @function
end

Class Method Details

.parse(tokens) ⇒ Object 



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# File 'lib/sql_tree/node/expression.rb', line 171

def self.parse(tokens)
  expr = self.new(tokens.next.literal)
  tokens.consume(SQLTree::Token::LPAREN)
  until tokens.peek == SQLTree::Token::RPAREN
    expr.arguments << SQLTree::Node::Expression.parse(tokens)
    tokens.consume(SQLTree::Token::COMMA) if tokens.peek == SQLTree::Token::COMMA
  end
  tokens.consume(SQLTree::Token::RPAREN)
  return expr
end

Instance Method Details

#to_sql ⇒ Object 



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# File 'lib/sql_tree/node/expression.rb', line 167

def to_sql
  "#{@function}(" + @arguments.map { |e| e.to_sql }.join(', ') + ")"
end