Class: SQLTree::Node::Value

Inherits:
Base
  • Object
show all
Defined in:
lib/sql_tree/node/value.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

[], #inspect, #quote_str, #quote_var

Constructor Details

#initialize(value) ⇒ Value

Returns a new instance of Value.



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# File 'lib/sql_tree/node/value.rb', line 6

def initialize(value)
  @value = value
end

Instance Attribute Details

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/sql_tree/node/value.rb', line 4

def value
  @value
end

Class Method Details

.parse(tokens) ⇒ Object 



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# File 'lib/sql_tree/node/value.rb', line 22

def self.parse(tokens)
  case tokens.next
  when SQLTree::Token::String, SQLTree::Token::Number
    SQLTree::Node::Value.new(tokens.current.literal)
  when SQLTree::Token::NULL
    SQLTree::Node::Value.new(nil)
  else
    raise SQLTree::Parser::UnexpectedToken.new(tokens.current, :literal)
  end
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/sql_tree/node/value.rb', line 18

def ==(other)
  other.kind_of?(self.class) && other.value == self.value
end

#to_sql ⇒ Object 



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# File 'lib/sql_tree/node/value.rb', line 10

def to_sql
  case value
  when nil    then 'NULL'
  when String then quote_str(@value)
  else             @value.to_s
  end
end