Class: SQLTree::Node::Field

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

[], #inspect, #quote_str

Constructor Details

#initialize(name, table = nil) ⇒ Field

Returns a new instance of Field.



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

def initialize(name, table = nil)
  @name = name
  @table = table
end

Instance Attribute Details

#name ⇒ Object Also known as: field

Returns the value of attribute name.



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# File 'lib/sql_tree/node/field.rb', line 5

def name
  @name
end

#table ⇒ Object

Returns the value of attribute table.



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# File 'lib/sql_tree/node/field.rb', line 5

def table
  @table
end

Class Method Details

.parse(tokens) ⇒ Object 



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# File 'lib/sql_tree/node/field.rb', line 28

def self.parse(tokens)
  field_or_table = case tokens.next
    when SQLTree::Token::MULTIPLY then :all
    when SQLTree::Token::Variable then tokens.current.literal
    else raise SQLTree::Parser::UnexpectedToken.new(tokens.current)
  end

  if tokens.peek == SQLTree::Token::DOT
    table = field_or_table
    tokens.consume(SQLTree::Token::DOT)
    field = case tokens.next
      when SQLTree::Token::MULTIPLY then :all
      when SQLTree::Token::Variable then tokens.current.literal
      else raise SQLTree::Parser::UnexpectedToken.new(tokens.current)
    end
    self.new(field, table)
  else
    self.new(field_or_table)
  end
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/sql_tree/node/field.rb', line 24

def ==(other)
  other.name == self.name && other.table == self.table
end

#quote_var(name) ⇒ Object 



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# File 'lib/sql_tree/node/field.rb', line 15

def quote_var(name)
  return '*' if name == :all
  super(name)
end

#to_sql ⇒ Object 



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# File 'lib/sql_tree/node/field.rb', line 20

def to_sql
  @table.nil? ? quote_var(@name) : quote_var(@table) + '.' + quote_var(@name)
end