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# frozen_string_literal: true
module Arel # :nodoc: all
module Visitors
class SQLite < Arel::Visitors::ToSql
private
# Locks are not supported in SQLite
def visit_Arel_Nodes_Lock(o, collector)
collector
end
def visit_Arel_Nodes_SelectStatement(o, collector)
o.limit = Arel::Nodes::Limit.new(-1) if o.offset && !o.limit
super
end
def visit_Arel_Nodes_True(o, collector)
collector << "1"
end
def visit_Arel_Nodes_False(o, collector)
collector << "0"
end
def visit_Arel_Nodes_IsNotDistinctFrom(o, collector)
collector = visit o.left, collector
collector << " IS "
visit o.right, collector
end
def visit_Arel_Nodes_IsDistinctFrom(o, collector)
collector = visit o.left, collector
collector << " IS NOT "
visit o.right, collector
end
# Queries used in UNION should not be wrapped by parentheses,
# because it is an invalid syntax in SQLite.
def infix_value_with_paren(o, collector, value, suppress_parens = false)
collector << "( " unless suppress_parens
left = o.left.is_a?(Nodes::Grouping) ? o.left.expr : o.left
collector = if left.class == o.class
infix_value_with_paren(left, collector, value, true)
else
grouping_parentheses left, collector, false
end
collector << value
right = o.right.is_a?(Nodes::Grouping) ? o.right.expr : o.right
collector = if right.class == o.class
infix_value_with_paren(right, collector, value, true)
else
grouping_parentheses right, collector, false
end
collector << " )" unless suppress_parens
collector
end
end
end
end
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