36 lines
1.0 KiB
Standard ML
36 lines
1.0 KiB
Standard ML
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structure AllDfa =
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struct
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type t = {curInt: int, curSpace: int, curBrace: int, lastInt: int,
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lastSpace: int, lastBrace: int}
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val initial: t =
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{
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curInt = IntDfa.start,
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curSpace = SpaceDfa.start,
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curBrace = BraceDfa.start,
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lastInt = ~1,
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lastSpace = ~1,
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lastBrace = ~1
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}
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fun areAllDead ({curInt, curSpace, curBrace, ...}: t) =
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curInt = 0 andalso curSpace = 0 andalso curBrace = 0
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fun update (chr, dfa, pos) =
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let
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val {curInt, curSpace, curBrace, lastInt, lastBrace, lastSpace} = dfa
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val curInt = IntDfa.next (curInt, chr)
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val curSpace = SpaceDfa.next (curSpace, chr)
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val curBrace = BraceDfa.next (curBrace, chr)
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val lastInt = if IntDfa.isFinal curInt then pos else lastInt
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val lastSpace = if SpaceDfa.isFinal curSpace then pos else lastSpace
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val lastBrace = if BraceDfa.isFinal curBrace then pos else lastBrace
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in
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{curInt = curInt, curSpace = curSpace, curBrace = curBrace, lastInt =
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lastInt, lastBrace = lastBrace, lastSpace = lastSpace}
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end
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end
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