2019-12-13 16:33:06 +01:00
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# This type allows to compute length once and for all
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struct StringWithLength{T <: AbstractString} <: AbstractString
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2019-08-19 19:54:38 +02:00
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s::T
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l::Int
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end
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string_with_length(s::AbstractString) = StringWithLength(s, length(s))
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Base.length(s::StringWithLength) = s.l
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2019-08-20 20:15:05 +02:00
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Base.iterate(s::StringWithLength, i::Integer = firstindex(s.s)) = iterate(s.s, i)
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2019-08-19 19:54:38 +02:00
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Base.nextind(s::StringWithLength, i::Int, n::Int = 1) = nextind(s.s, i, n)
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Base.ncodeunits(s::StringWithLength) = ncodeunits(s.s)
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Base.isvalid(s::StringWithLength, i::Int) = isvalid(s.s, i)
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2019-12-12 15:38:20 +01:00
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2020-02-07 14:31:00 +01:00
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2019-08-19 19:54:38 +02:00
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function reorder(s1::AbstractString, s2::AbstractString)
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s1 = string_with_length(s1)
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s2 = string_with_length(s2)
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2020-02-07 14:31:00 +01:00
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(length(s1) <= length(s2)) ? (s1, s2) : (s2, s1)
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end
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function reorder(s1, s2)
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(length(s1) <= length(s2)) ? (s1, s2) : (s2, s1)
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2019-08-20 17:59:23 +02:00
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end
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2019-08-17 17:40:26 +02:00
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2020-02-07 14:31:00 +01:00
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function common_prefix(s1, s2)
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2019-08-17 17:40:26 +02:00
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x1 = iterate(s1)
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x2 = iterate(s2)
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2019-12-13 16:33:06 +01:00
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l = 0
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while (x1 !== nothing) & (x2 !== nothing)
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2019-08-17 17:40:26 +02:00
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ch1, state1 = x1
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ch2, state2 = x2
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ch1 != ch2 && break
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2019-12-13 16:33:06 +01:00
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l += 1
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2019-08-17 17:40:26 +02:00
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x1 = iterate(s1, state1)
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x2 = iterate(s2, state2)
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end
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return l, x1, x2
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2019-12-13 02:01:47 +01:00
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end
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