kalmar/Groups.jl
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add missing cases for find first (length =0, 1)

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kalmar 2017-07-05 16:16:47 +02:00
parent 613ec172bd
commit 5a9d4b4bb6
1 changed files with 21 additions and 10 deletions
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31
src/Groups.jl
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@ -271,21 +271,32 @@ is_subsymbol(s::GSymbol, t::GSymbol) =
function findfirst(W::GWord, Z::GWord)
n = length(Z.symbols)
@assert n > 1
for (idx,a) in enumerate(W.symbols)
if idx + n - 1 > length(W.symbols)
if n == 0
return 0
elseif n == 1
for (i,s) in enumerate(W.symbols)
if is_subsymbol(Z.symbols[1], s)
return i
end
end
return 0
else
for (idx,a) in enumerate(W.symbols)
if idx + n - 1 > length(W.symbols)
break
end
foundfirst = is_subsymbol(Z.symbols[1],a)
if foundfirst
end
foundfirst = is_subsymbol(Z.symbols[1], a)
if foundfirst
middlematch = W.symbols[idx+1:idx+n-2] == Z.symbols[2:end-1]
lastmatch = is_subsymbol(Z.symbols[end], W.symbols[idx+n-1])
if middlematch && lastmatch
return idx
return idx
end
end
end
return 0
end
end
end
return 0
end
function findnext(W::GWord, Z::GWord, i::Integer)