Class: Sass::Script::Tree::Operation

Inherits:
Node
  • Object
show all
Defined in:
/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/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

#filename, #line, #options, #source_range

Instance Method Summary (collapse)

Methods inherited from Node

#dasherize, #force_division!, #opts, #perform

Constructor Details

- (Operation) initialize(operand1, operand2, operator)

Returns a new instance of Operation

Parameters:

  • operand1 (Sass::Script::Tree::Node)

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

  • operand2 (Sass::Script::Tree::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 '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 18

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 '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 8

def operand1
  @operand1
end

- operand2 (readonly)

Returns the value of attribute operand2



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 9

def operand2
  @operand2
end

- operator (readonly)

Returns the value of attribute operator



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 10

def operator
  @operator
end

Instance Method Details

- (Sass::Script::Value) _perform(environment) (protected)

Evaluates the operation.

Parameters:

  • environment (Sass::Environment)

    The environment in which to evaluate the SassScript

Returns:

Raises:



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 66

def _perform(environment)
  value1 = @operand1.perform(environment)

  # Special-case :and and :or to support short-circuiting.
  if @operator == :and
    return value1.to_bool ? @operand2.perform(environment) : value1
  elsif @operator == :or
    return value1.to_bool ? value1 : @operand2.perform(environment)
  end

  value2 = @operand2.perform(environment)

  if (value1.is_a?(Sass::Script::Value::Null) || value2.is_a?(Sass::Script::Value::Null)) &&
      @operator != :eq && @operator != :neq
    raise Sass::SyntaxError.new(
      "Invalid null operation: \"#{value1.inspect} #{@operator} #{value2.inspect}\".")
  end

  begin
    result = opts(value1.send(@operator, value2))
  rescue NoMethodError => e
    raise e unless e.name.to_s == @operator.to_s
    raise Sass::SyntaxError.new("Undefined operation: \"#{value1} #{@operator} #{value2}\".")
  end

  warn_for_color_arithmetic(value1, value2)
  warn_for_unitless_equals(value1, value2, result)

  result
end

- (Array<Node>) children

Returns the operands for this operation.

Returns:

See Also:



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 47

def children
  [@operand1, @operand2]
end

- deep_copy

See Also:



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 52

def deep_copy
  node = dup
  node.instance_variable_set('@operand1', @operand1.deep_copy)
  node.instance_variable_set('@operand2', @operand2.deep_copy)
  node
end

- (String) inspect

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 '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 26

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

- to_sass(opts = {})

See Also:



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# File '/home/nweiz/code/sass-site/.sass/lib/sass/script/tree/operation.rb', line 31

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