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Reports (Research Report) Year : 2011

Visibly Pushdown Transducers with Look-Ahead

Emmanuel Filiot
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Frédéric Servais
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Visibly Pushdown Transducers (VPTs) form a subclass of pushdown transducers. In this paper, we investigate the extension of VPTs with look-ahead (VPTs+LA). Intuitively they are VPTs that can check that the well-nested subword starting at the current position belongs to a given visibly pushdown language. First, we show that VPTs+LA are not more expressive than VPTs, but they are exponentially more succinct. Second, we show that the class of deterministic VPTs+LA corresponds exactly to the class of functional VPTs. Finally, we show that, while VPTs+LA may be exponentially more succinct than VPTs, checking equivalence of functional VPTs+LA is, as for VPTs, Exptime-complete.
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Dates and versions

inria-00573965 , version 1 (06-03-2011)
inria-00573965 , version 2 (25-04-2011)


  • HAL Id : inria-00573965 , version 1


Emmanuel Filiot, Frédéric Servais. Visibly Pushdown Transducers with Look-Ahead. [Research Report] 2011. ⟨inria-00573965v1⟩
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