Class: Seaquel::StatementGatherer

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/seaquel/statement_gatherer.rb

Overview

Visits a statement AST and issues a statement.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(statement, quoter) ⇒ StatementGatherer 



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# File 'lib/seaquel/statement_gatherer.rb', line 9

def initialize statement, quoter
  @statement = statement
  @quoter = quoter
  @current_join = nil
end

Instance Attribute Details

#current_join ⇒ Object (readonly)

Returns the value of attribute current_join.



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# File 'lib/seaquel/statement_gatherer.rb', line 7

def current_join
  @current_join
end

Instance Method Details

#visit_delete(parent) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 90

def visit_delete parent
  continue(parent)

  s.set_type(:delete)
end

#visit_fields(parent, fields) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 84

def visit_fields parent, fields
  continue(parent)

  s.fields.concat(fields)
end

#visit_from(parent, *args) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 17

def visit_from parent, *args
  s.from.concat(args)

  continue(parent)
end

#visit_insert(parent) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 69

def visit_insert parent
  continue(parent)

  s.set_type(:insert)
end

#visit_into(parent, table) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 74

def visit_into parent, table
  continue(parent)

  s.set_target(table)
end

#visit_join(parent, tables) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 55

def visit_join parent, tables
  continue(parent)

  @current_join = s.join(tables)
end

#visit_limit(parent, n) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 101

def visit_limit parent, n
  continue(parent)

  s.set_limit(n)
end

#visit_offset(parent, n) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 96

def visit_offset parent, n
  continue(parent)

  s.set_offset(n)
end

#visit_on(parent, exps) ⇒ Object

Raises:

  • (InvalidExpression) 


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# File 'lib/seaquel/statement_gatherer.rb', line 60

def visit_on(parent, exps)
  continue(parent)

  raise InvalidExpression, ".on without a .join encoutered" \
    unless current_join
  
  current_join.on(exps)
end

#visit_order_by(parent, list) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 32

def visit_order_by parent, list
  continue(parent)

  s.order_by.replace(list)
end

#visit_project(parent, fields) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 25

def visit_project parent, fields
  continue(parent)

  # Since the tree is processed in lifo order, we need to only apply the
  # very last project. 
  s.project.replace(fields)
end

#visit_select(parent) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 22

def visit_select parent
  continue(parent)
end

#visit_set(parent, assign_list) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 49

def visit_set parent, assign_list
  continue(parent)

  s.set.concat(assign_list)
end

#visit_update(parent, table) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 43

def visit_update parent, table
  continue(parent)

  s.set_type(:update)
  s.set_target(table)
end

#visit_values(parent, values) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 79

def visit_values parent, values
  continue(parent)

  s.values << AST::List.new(values)
end

#visit_where(parent, expression) ⇒ Object 



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# File 'lib/seaquel/statement_gatherer.rb', line 37

def visit_where parent, expression
  continue(parent)

  s.where.concat(expression)
end