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23 lines
572 B
Julia
23 lines
572 B
Julia
import Base: convert
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export FGSymbol, FGWord
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immutable FGSymbol <: GSymbol
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gen::String
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pow::Int
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end
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(==)(s::FGSymbol, t::FGSymbol) = s.gen == t.gen && s.pow == t.pow
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hash(s::FGSymbol, h::UInt) = hash(s.gen, hash(s.pow, hash(:FGSymbol, h)))
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IdSymbol(::Type{FGSymbol}) = FGSymbol("(id)", 0)
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FGSymbol(x::String) = FGSymbol(x,1)
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convert(::Type{FGSymbol}, x::String) = FGSymbol(x)
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change_pow(s::FGSymbol, n::Int) = (n==0 ? i=one(s) : FGSymbol(s.gen, n))
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inv(s::FGSymbol) = change_pow(s, -s.pow)
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typealias FGWord GWord{FGSymbol}
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FGWord(s::FGSymbol) = FGWord([s])
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