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https://github.com/haml/haml.git
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92 lines
2.9 KiB
Ruby
92 lines
2.9 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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require 'sass/script/interpolation'
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require 'sass/script/string_interpolation'
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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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attr_reader :operand1
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attr_reader :operand2
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attr_reader :operator
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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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super()
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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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# @see Node#to_sass
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def to_sass(opts = {})
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pred = Sass::Script::Parser.precedence_of(@operator)
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o1 = operand_to_sass pred, @operand1, opts
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o2 = operand_to_sass pred, @operand2, opts
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sep =
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case @operator
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when :comma; ", "
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when :concat; " "
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else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
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end
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"#{o1}#{sep}#{o2}"
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end
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# Returns the operands for this operation.
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#
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# @return [Array<Node>]
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# @see Node#children
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def children
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[@operand1, @operand2]
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end
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protected
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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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if @operator == :concat && context == :equals
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literal1 = Sass::Script::String.new(literal1.value) if literal1.is_a?(Sass::Script::String)
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literal2 = Sass::Script::String.new(literal2.value) if literal2.is_a?(Sass::Script::String)
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end
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begin
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res = literal1.send(@operator, literal2)
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res.options = environment.options
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res
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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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private
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def operand_to_sass(pred, op, opts = {})
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return "(#{op.to_sass(opts)})" if op.is_a?(Operation) &&
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Sass::Script::Parser.precedence_of(op.operator) < pred
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op.to_sass(opts)
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end
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end
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end
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