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require 'set'
require 'sass/script/string'
require 'sass/script/number'
require 'sass/script/color'
require 'sass/script/functions'
require 'sass/script/unary_operation'
require 'sass/script/interpolation'
require 'sass/script/string_interpolation'
module Sass::Script
# A SassScript parse node representing a binary operation,
# such as `$a + $b` or `"foo" + 1`.
class Operation < Node
attr_reader :operand1
attr_reader :operand2
attr_reader :operator
# @param operand1 [Script::Node] The parse-tree node
# for the right-hand side of the operator
# @param operand2 [Script::Node] The parse-tree node
# for the left-hand side of the operator
# @param operator [Symbol] The operator to perform.
# This should be one of the binary operator names in {Lexer::OPERATORS}
def initialize(operand1, operand2, operator)
@operand1 = operand1
@operand2 = operand2
@operator = operator
super()
end
# @return [String] A human-readable s-expression representation of the operation
def inspect
"(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
end
# @see Node#to_sass
def to_sass(opts = {})
pred = Sass::Script::Parser.precedence_of(@operator)
o1 = operand_to_sass @operand1, :left, opts
o2 = operand_to_sass @operand2, :right, opts
sep =
case @operator
when :comma; ", "
when :space; " "
else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
end
"#{o1}#{sep}#{o2}"
end
# Returns the operands for this operation.
#
# @return [Array<Node>]
# @see Node#children
def children
[@operand1, @operand2]
end
# @see Node#deep_copy
def deep_copy
node = dup
node.instance_variable_set('@operand1', @operand1.deep_copy)
node.instance_variable_set('@operand2', @operand2.deep_copy)
node
end
protected
# Evaluates the operation.
#
# @param environment [Sass::Environment] The environment in which to evaluate the SassScript
# @return [Literal] The SassScript object that is the value of the operation
# @raise [Sass::SyntaxError] if the operation is undefined for the operands
def _perform(environment)
literal1 = @operand1.perform(environment)
# Special-case :and and :or to support short-circuiting.
if @operator == :and
return literal1.to_bool ? @operand2.perform(environment) : literal1
elsif @operator == :or
return literal1.to_bool ? literal1 : @operand2.perform(environment)
end
literal2 = @operand2.perform(environment)
literal_types = [literal1.class, literal2.class]
if !literal_types.include?(String) && literal_types.include?(Null)
raise Sass::SyntaxError.new("Invalid null operation: \"#{literal1.inspect} #{@operator} #{literal2.inspect}\".")
end
begin
opts(literal1.send(@operator, literal2))
rescue NoMethodError => e
raise e unless e.name.to_s == @operator.to_s
raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".")
end
end
private
def operand_to_sass(op, side, opts)
return "(#{op.to_sass(opts)})" if op.is_a?(List)
return op.to_sass(opts) unless op.is_a?(Operation)
pred = Sass::Script::Parser.precedence_of(@operator)
sub_pred = Sass::Script::Parser.precedence_of(op.operator)
assoc = Sass::Script::Parser.associative?(@operator)
return "(#{op.to_sass(opts)})" if sub_pred < pred ||
(side == :right && sub_pred == pred && !assoc)
op.to_sass(opts)
end
end
end
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