Class: Sass::Script::Operation

Inherits:
Node
  • Object
show all
Defined in:
lib/sass/script/operation.rb

Overview

A SassScript parse node representing a binary operation, such as $a + $b or "foo" + 1.

Instance Attribute Summary collapse

Attributes inherited from Node

#context, #line, #options

Instance Method Summary collapse

Methods inherited from Node

#dasherize, #perform

Constructor Details

#initialize(operand1, operand2, operator) ⇒ Operation

Returns a new instance of Operation.

Parameters:

  • operand1 (Script::Node) —

    The parse-tree node for the right-hand side of the operator

  • operand2 (Script::Node) —

    The parse-tree node for the left-hand side of the operator

  • operator (Symbol) —

    The operator to perform. This should be one of the binary operator names in Lexer::OPERATORS



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# File 'lib/sass/script/operation.rb', line 24

def initialize(operand1, operand2, operator)
  @operand1 = operand1
  @operand2 = operand2
  @operator = operator
  super()
end

Instance Attribute Details

#operand1 (readonly)

Returns the value of attribute operand1.



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# File 'lib/sass/script/operation.rb', line 14

def operand1
  @operand1
end

#operand2 (readonly)

Returns the value of attribute operand2.



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# File 'lib/sass/script/operation.rb', line 15

def operand2
  @operand2
end

#operator (readonly)

Returns the value of attribute operator.



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# File 'lib/sass/script/operation.rb', line 16

def operator
  @operator
end

Instance Method Details

#_perform(environment) ⇒ Literal (protected)

Evaluates the operation.

Parameters:

  • environment (Sass::Environment) —

    The environment in which to evaluate the SassScript

Returns:

  • (Literal) —

    The SassScript object that is the value of the operation

Raises:



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# File 'lib/sass/script/operation.rb', line 65

def _perform(environment)
  literal1 = @operand1.perform(environment)
  literal2 = @operand2.perform(environment)

  if @operator == :concat && context == :equals
    literal1 = Sass::Script::String.new(literal1.value) if literal1.is_a?(Sass::Script::String)
    literal2 = Sass::Script::String.new(literal2.value) if literal2.is_a?(Sass::Script::String)
  end

  begin
    res = literal1.send(@operator, literal2)
    res.options = environment.options
    res
  rescue NoMethodError => e
    raise e unless e.name.to_s == @operator.to_s
    raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".")
  end
end

#children ⇒ Array<Node>

Returns the operands for this operation.

Returns:

See Also:



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# File 'lib/sass/script/operation.rb', line 54

def children
  [@operand1, @operand2]
end

#inspect ⇒ String

Returns A human-readable s-expression representation of the operation.

Returns:

  • (String) —

    A human-readable s-expression representation of the operation



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# File 'lib/sass/script/operation.rb', line 32

def inspect
  "(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
end

#to_sass(opts = {})

See Also:



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# File 'lib/sass/script/operation.rb', line 37

def to_sass(opts = {})
  pred = Sass::Script::Parser.precedence_of(@operator)
  o1 = operand_to_sass pred, @operand1, opts
  o2 = operand_to_sass pred, @operand2, opts
  sep =
    case @operator
    when :comma; ", "
    when :concat; " "
    else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
    end
  "#{o1}#{sep}#{o2}"
end