77 lines
1.7 KiB
Ruby
77 lines
1.7 KiB
Ruby
# ast classes
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module Parser
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class Expression
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def eval
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raise "abstract"
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end
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def compare other , attributes
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attributes.each do |a|
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left = send(a)
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right = other.send( a)
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return false unless left.class == right.class
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return false unless left == right
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end
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return true
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end
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end
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class IntegerExpression < Expression
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attr_reader :value
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def initialize val
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@value = val
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end
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def == other
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compare other , [:value]
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end
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end
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class NameExpression < Expression
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attr_reader :name
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def initialize name
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@name = name
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end
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def == other
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compare other , [:name]
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end
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end
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class FuncallExpression < Expression
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attr_reader :name, :args
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def initialize name, args
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@name , @args = name , args
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end
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def == other
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compare other , [:name , :args]
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end
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end
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class ConditionalExpression < Expression
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attr_reader :cond, :if_true, :if_false
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def initialize cond, if_true, if_false
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@cond, @if_true, @if_false = cond, if_true, if_false
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end
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def == other
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compare other , [:cond, :if_true, :if_false]
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end
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end
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class AssignmentExpression < Expression
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attr_reader :assignee, :assigned
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def initialize assignee, assigned
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@assignee, @assigned = assignee, assigned
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end
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def == other
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compare other , [:assignee, :assigned]
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end
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end
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class FunctionExpression < Expression
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attr_reader :name, :params, :block
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def initialize name, params, block
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@name, @params, @block = name, params, block
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end
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def == other
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compare other , [:name, :params, :block]
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end
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end
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end
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