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Sass::Script::Operation

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

Attributes

operand1[R]
operand2[R]
operator[R]

Public Class Methods

new(operand1, operand2, operator) click to toggle source

@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}
    # File lib/sass/script/operation.rb, line 24
24:     def initialize(operand1, operand2, operator)
25:       @operand1 = operand1
26:       @operand2 = operand2
27:       @operator = operator
28:       super()
29:     end

Public Instance Methods

children() click to toggle source

Returns the operands for this operation.

@return [Array] @see Node#children

    # File lib/sass/script/operation.rb, line 54
54:     def children
55:       [@operand1, @operand2]
56:     end
inspect() click to toggle source

@return [String] A human-readable s-expression representation of the operation

    # File lib/sass/script/operation.rb, line 32
32:     def inspect
33:       "(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
34:     end
to_sass(opts = {}) click to toggle source

@see Node#to_sass

    # File lib/sass/script/operation.rb, line 37
37:     def to_sass(opts = {})
38:       pred = Sass::Script::Parser.precedence_of(@operator)
39:       o1 = operand_to_sass pred, @operand1, opts
40:       o2 = operand_to_sass pred, @operand2, opts
41:       sep =
42:         case @operator
43:         when :comma; ", "
44:         when :concat; " "
45:         else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
46:         end
47:       "#{o1}#{sep}#{o2}"
48:     end

Protected Instance Methods

_perform(environment) click to toggle source

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

    # File lib/sass/script/operation.rb, line 65
65:     def _perform(environment)
66:       literal1 = @operand1.perform(environment)
67:       literal2 = @operand2.perform(environment)
68: 
69:       if @operator == :concat && context == :equals
70:         literal1 = Sass::Script::String.new(literal1.value) if literal1.is_a?(Sass::Script::String)
71:         literal2 = Sass::Script::String.new(literal2.value) if literal2.is_a?(Sass::Script::String)
72:       end
73: 
74:       begin
75:         res = literal1.send(@operator, literal2)
76:         res.options = environment.options
77:         res
78:       rescue NoMethodError => e
79:         raise e unless e.name.to_s == @operator.to_s
80:         raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".")
81:       end
82:     end

Private Instance Methods

operand_to_sass(pred, op, opts = {}) click to toggle source
    # File lib/sass/script/operation.rb, line 86
86:     def operand_to_sass(pred, op, opts = {})
87:       return "(#{op.to_sass(opts)})" if op.is_a?(Operation) &&
88:         Sass::Script::Parser.precedence_of(op.operator) < pred
89:       op.to_sass(opts)
90:     end

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