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module Arel
module Sql
module Quoting
delegate :quote_table_name, :quote_column_name, :quote, :to => :engine
end
class Formatter
attr_reader :engine
include Quoting
def initialize(engine)
@engine = engine
end
end
class SelectClause < Formatter
def attribute(relation_name, attribute_name, aliaz)
"#{quote_table_name(relation_name)}.#{quote_column_name(attribute_name)}" + (aliaz ? " AS #{quote(aliaz.to_s)}" : "")
end
def select(select_sql, aliaz)
"(#{select_sql})" + (aliaz ? " AS #{quote(aliaz)}" : "")
end
def value(value)
value
end
end
class PassThrough < Formatter
def value(value)
value
end
end
class WhereClause < PassThrough
end
class OrderClause < PassThrough
def attribute(relation_name, attribute_name, aliaz)
"#{quote_table_name(relation_name)}.#{quote_column_name(attribute_name)}"
end
end
class WhereCondition < Formatter
def attribute(relation_name, attribute_name, aliaz)
"#{quote_table_name(relation_name)}.#{quote_column_name(attribute_name)}"
end
def value(value)
value.to_sql(self)
end
def scalar(value, column = nil)
quote(value, column)
end
def select(select_sql, aliaz)
"(#{select_sql})"
end
end
class SelectStatement < Formatter
def select(select_sql, aliaz)
select_sql
end
end
class TableReference < Formatter
def select(select_sql, aliaz)
"(#{select_sql}) AS #{quote_table_name(aliaz)}"
end
end
class Attribute < WhereCondition
def initialize(attribute)
@attribute, @engine = attribute, attribute.engine
end
def scalar(scalar)
quote(scalar, @attribute.column)
end
def array(array)
"(" + array.collect { |e| e.to_sql(self) }.join(', ') + ")"
end
def range(left, right)
"#{left} AND #{right}"
end
end
class Value < WhereCondition
end
end
end
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