46 lines
1.6 KiB
Ruby
46 lines
1.6 KiB
Ruby
require 'set'
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require 'sass/script/string'
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require 'sass/script/number'
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require 'sass/script/color'
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require 'sass/script/functions'
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require 'sass/script/unary_operation'
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module Sass::Script
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# A SassScript parse node representing a binary operation,
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# such as `!a + !b` or `"foo" + 1`.
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class Operation < Node
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# @param operand1 [Script::Node] The parse-tree node
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# for the right-hand side of the operator
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# @param operand2 [Script::Node] The parse-tree node
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# for the left-hand side of the operator
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# @param operator [Symbol] The operator to perform.
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# This should be one of the binary operator names in {Lexer::OPERATORS}
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def initialize(operand1, operand2, operator)
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@operand1 = operand1
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@operand2 = operand2
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@operator = operator
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end
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# @return [String] A human-readable s-expression representation of the operation
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def inspect
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"(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
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end
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# Evaluates the operation.
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#
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# @param environment [Sass::Environment] The environment in which to evaluate the SassScript
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# @return [Literal] The SassScript object that is the value of the operation
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# @raise [Sass::SyntaxError] if the operation is undefined for the operands
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def perform(environment)
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literal1 = @operand1.perform(environment)
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literal2 = @operand2.perform(environment)
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begin
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literal1.send(@operator, literal2)
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rescue NoMethodError => e
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raise e unless e.name.to_s == @operator.to_s
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raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".")
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end
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end
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end
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end
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