SWI-Prolog -- sequence//5

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SWI-Prolog owl logo Grammar rule sequence//5

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Documentation
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  - The SWI-Prolog library
    - library(dcg/high_order): High order grammar operations
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Availability::- use_module(library(dcg/high_order)).

Source [semidet]sequence(:Start, :Element, :Sep, :End, ?List) //

Match or generate a sequence of Element enclosed by Start end End, where each pair of elements is separated by Sep. More formally, it matches the following sequence:

Start, (Element, (Sep,Element)*)?, End

The example below matches a Prolog list of integers:

?- phrase(sequence(("[",blanks),
 number, (",",blanks),
 (blanks,"]"), L),
 `[1, 2, 3 ] a`, Tail).
L = [1, 2, 3],
Tail = [32, 97].

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