Class: AdvancedSearch::Adapters::PG::Visitor

Inherits:
Object
  • Object
show all
Defined in:
lib/advanced_search/adapters/pg/visitor.rb

Instance Method Summary collapse

Constructor Details

#initialize(placeholder_style) ⇒ Visitor

Returns a new instance of Visitor.



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 7

def initialize(placeholder_style)
  @placeholder_style = placeholder_style
  @sql = []
  @binds = []
end

Instance Method Details

#result ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 13

def result
  Query.new(@sql.join(' '), @binds)
end

#visit_and(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 17

def visit_and(node)
  @sql << '('
  node.edges.each_with_index do |child, i|
    unless i.zero?
      @sql << 'and'
    end
    child.accept(self)
  end
  @sql << ')'
end

#visit_eq(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 28

def visit_eq(node)
  node.edges[0].accept(self)
  @sql << '='
  node.edges[1].accept(self)
end

#visit_id(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 34

def visit_id(node)
  @sql << node.id
end

#visit_lt(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 38

def visit_lt(node)
  node.edges[0].accept(self)
  @sql << '<'
  node.edges[1].accept(self)
end

#visit_or(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 44

def visit_or(node)
  @sql << '('
  node.edges.each_with_index do |child, i|
    unless i.zero?
      @sql << 'or'
    end
    child.accept(self)
  end
  @sql << ')'
end

#visit_value(node) ⇒ Object 



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# File 'lib/advanced_search/adapters/pg/visitor.rb', line 55

def visit_value(node)
  @sql << placeholder(@binds.length + 1)
  @binds << node.value
end