117 lines
2.4 KiB
Ruby
117 lines
2.4 KiB
Ruby
module Mutant
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module Meta
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class Example
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# Example DSL
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class DSL
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include NodeHelpers
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# Run DSL on block
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#
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# @return [Example]
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#
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# @api private
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#
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def self.run(block)
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instance = new
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instance.instance_eval(&block)
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instance.example
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end
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# Initialize DSL context
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#
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# @return [undefined]
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#
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# @api private
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#
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def initialize
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@source = nil
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@expected = []
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end
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# Return example
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#
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# @return [Example]
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#
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# @raise [RuntimeError]
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# in case example cannot be build
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#
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# @api private
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#
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def example
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raise 'source not defined' unless @source
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Example.new(@source, @expected)
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end
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private
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# Set original source
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#
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# @param [String,Parser::AST::Node] input
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#
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# @return [self]
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#
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# @api private
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#
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def source(input)
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raise 'source already defined' if @source
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@source = node(input)
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self
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end
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# Add expected mutation
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#
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# @param [String,Parser::AST::Node] input
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#
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# @return [self]
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#
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# @api private
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#
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def mutation(input)
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node = node(input)
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if @expected.include?(node)
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raise "Node for input: #{input.inspect} is already expected"
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end
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@expected << node
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self
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end
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# Add singleotn mutations
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#
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# @return [undefined]
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#
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# @api private
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#
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def singleton_mutations
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mutation('nil')
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mutation('self')
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end
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# Helper method to coerce input to node
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#
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# @param [String,Parser::AST::Node] input
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#
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# @return [Parser::AST::Node]
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#
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# @raise [RuntimeError]
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# in case input cannot be coerced
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#
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# @api private
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#
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def node(input)
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case input
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when String
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Unparser::Preprocessor.run(Parser::CurrentRuby.parse(input))
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when Parser::AST::Node
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input
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else
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raise "Cannot coerce to node: #{source.inspect}"
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end
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end
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end # DSL
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end # Example
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end # Meta
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end # Mutant
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