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replace adjacent whitespace characters with a single SPACE character

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This commit is contained in:
Markus Triska
2023-08-27 12:55:29 +02:00
parent 9b96735615
commit 75aec69de1
1 changed files with 12 additions and 1 deletions
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13
src/lib/xpath.pl
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@@ -642,7 +642,8 @@ normalize_space(Cs0, Cs) :-
no_leading_whitespace(Cs0, Cs1),
reverse(Cs1, Cs2),
no_leading_whitespace(Cs2, Cs3),
reverse(Cs3, Cs).
reverse(Cs3, Cs4),
single_intermediate_space(Cs4, Cs).
no_leading_whitespace([], []).
no_leading_whitespace([C0|Cs0], Cs) :-
@@ -650,3 +651,13 @@ no_leading_whitespace([C0|Cs0], Cs) :-
no_leading_whitespace(Cs0, Cs)
; Cs = [C0|Cs0]
).
single_intermediate_space([], []).
single_intermediate_space([C0|Cs0], [C|Cs]) :-
( char_type(C0, whitespace) ->
no_leading_whitespace(Cs0, Cs1),
C = ' ',
single_intermediate_space(Cs1, Cs)
; C = C0,
single_intermediate_space(Cs0, Cs)
).