Befehlsargumente auf erlaubte Zeichen überprüfen mit expl3

2

Ein Befehlsargument, in dem nur bestimmte Zeichen (sagen wir beispielshalber 0, 1, a und b) erlaubt sein sollen, soll vor der weiteren Verarbeitung im Hinblick hierauf überprüft werden. Idee hierzu: Mit einer for-Schleife wird der gesamte Inhalt des Arguments Zeichen für Zeichen durchlaufen. Innerhalb der Schleife überprüft dann eine case-Anweisung, ob es sich um ein erlaubtes Zeichen handelt. Ansonsten wird ein Fehlercode ausgeführt (hier eine Package-Warnung).

Ich habe eine Umsetzung auf der Grundlage zweier verschiedener expl3-Datenstrukturen (token list und string) versucht, aber beides funktioniert nicht, wie es soll. Bei der String-Variante liegt dies offenbar daran, dass das zweite Argument von \str_set:Nn nicht expandiert wird, aber ich weiß nicht, was ich ändern muss.

Open in Online-Editor
Code, hier editierbar zum Übersetzen:
\documentclass{article}
\usepackage[check-declarations]{expl3}
\usepackage{xparse}
\ExplSyntaxOn
\int_new:N \l_zeichenzahl_int
\tl_new:N \l_zeichen_tl
\str_new:N \l_zeichen_str
\cs_new_protected:Npn \test_mit_tl:n #1
    {
        \int_set:Nn \l_zeichenzahl_int {\str_count_ignore_spaces:n {#1}}
        \cs_set:Npn \zeichen_pruefen:n ##1
            {
                \tl_set:Nn \l_zeichen_tl {\str_item_ignore_spaces:nn {#1} {##1}}
                \tl_case:NnF \l_zeichen_tl
                    {
                        0 {}
                        1 {}
                        a {}
                        b {}
                    }
                    {\PackageWarning{noname}{Falsches~Zeichen:~\l_zeichen_tl}}
            }
        \int_step_function:nnnN {1} {1} {\l_zeichenzahl_int} \zeichen_pruefen:n
    }
\cs_new_protected:Npn \test_mit_str:n #1
    {
        \int_set:Nn \l_zeichenzahl_int {\str_count_ignore_spaces:n {#1}}
        \cs_set:Npn \zeichen_pruefen:n ##1
            {
                \str_set:Nn \l_zeichen_str {\str_item_ignore_spaces:nn {#1} {##1}}
                \str_case:nnF {\l_zeichen_str}
                    {
                        {0} {}
                        {1} {}
                        {a} {}
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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gefragt 23 Mai '16, 17:41

Cletus's gravatar image

Cletus
1.6k●7●58●67
Akzeptiert-Rate: 75%

bearbeitet 23 Mai '16, 17:43

Sehe ich das richtig, dass Leerzeichen ignoriert werden sollen? Was ist mit komplett leerem Input?

(24 Mai '16, 09:54) cgnieder

Ja, Leerzeichen stören in diesem Fall nicht und sollen ignoriert werden. Eine leere Eingabe ist dagegen nicht erwünscht/sinnvoll.

(24 Mai '16, 12:54) Cletus
Eine Antwort:
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2

Du hast in beiden Definitionen kleine aber wesentliche Fehler. In der Tokenlist-Definition hast Du folgende Zeile:

Öffne in Overleaf
\tl_set:Nn \l_zeichen_tl {\str_item_ignore_spaces:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Wenn Du die damit definierte Tokenlist mit \tl_show:N \l_zeichen_tl inspizierst, zeigt es Dir z.B.

Öffne in Overleaf
> \l_zeichen_tl=\str_item_ignore_spaces:nn {12ab}{1}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Ändere die Zeile in

Öffne in Overleaf
\tl_set:Nx \l_zeichen_tl {\str_item_ignore_spaces:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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und daraus wird

Öffne in Overleaf
> \l_zeichen_tl=1
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Das reicht aber noch nicht. \tl_case:Nn testet gegen den Inhalt von Variablen, nicht gegen einzelne Token. Du musst also passende Testvariablen definieren

Öffne in Overleaf
Code, hier editierbar zum Übersetzen:
\tl_const:Nn \c_zeichen_case_a_tl {0}
\tl_const:Nn \c_zeichen_case_b_tl {1}
\tl_const:Nn \c_zeichen_case_c_tl {a}
\tl_const:Nn \c_zeichen_case_d_tl {b}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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und verwenden:

Öffne in Overleaf
Code, hier editierbar zum Übersetzen:
\tl_case:NnF \l_zeichen_tl
  {
    \c_zeichen_case_a_tl {}
    \c_zeichen_case_b_tl {}
    \c_zeichen_case_c_tl {}
    \c_zeichen_case_d_tl {}
  }
  {...}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Das reicht immer noch nicht: in Tokenlists hängt ein Match auch vom Kategoriecode der Zeichen ab. Mit

Öffne in Overleaf
\tl_set:Nx \l_zeichen_tl {\str_item_ignore_spaces:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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ensteht eine Tokenliste, in der alle Zeichen Kategoriecode 12 haben. In den Testvariablen haben sie das mit obiger Definition nicht. Darum ändern wir noch mal:

Öffne in Overleaf
\tl_set:Nx \l_zeichen_tl {\tl_item:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Und jetzt klappt der Test.

In der String-Variante hast Du ähnliche Fehler:

Öffne in Overleaf
\str_set:Nn \l_zeichen_str {\str_item_ignore_spaces:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Ändere das in

Öffne in Overleaf
\str_set:Nx \l_zeichen_str {\str_item_ignore_spaces:nn {#1} {##1}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Außerdem hast Du

Öffne in Overleaf
\str_case:nnF {\l_zeichen_str} ...
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Das vergleicht aber nicht den Inhalt der Variablen \l_zeichen_str mit den verschiedenen Fällen, sondern den String \ l _ z e i c h e n _ s t r (ohne Leerzeichen). Du brauchst die Variante

Öffne in Overleaf
\str_case:VnF \l_zeichen_str ...
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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die Du am besten mit

Öffne in Overleaf
\cs_generate_variant:Nn \str_case:nnF {V}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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bereitstellst.

Mit diesen Korrekturen funktioniert Dein Code:

Öffne in Overleaf
Code, hier editierbar zum Übersetzen:
\documentclass{article}
\usepackage[check-declarations]{expl3}
\usepackage{xparse}
\ExplSyntaxOn
\int_new:N \l_zeichenzahl_int
\tl_new:N \l_zeichen_tl
\str_new:N \l_zeichen_str
\tl_const:Nn \c_zeichen_case_a_tl {0}
\tl_const:Nn \c_zeichen_case_b_tl {1}
\tl_const:Nn \c_zeichen_case_c_tl {a}
\tl_const:Nn \c_zeichen_case_d_tl {b}
\cs_new_protected:Npn \test_mit_tl:n #1
  {
    \int_set:Nn \l_zeichenzahl_int {\str_count_ignore_spaces:n {#1}}
    \cs_set:Npn \zeichen_pruefen:n ##1
      {
        \tl_set:Nx \l_zeichen_tl {\tl_item:nn {#1} {##1}}
        \tl_case:NnF \l_zeichen_tl
          {
            \c_zeichen_case_a_tl {}
            \c_zeichen_case_b_tl {}
            \c_zeichen_case_c_tl {}
            \c_zeichen_case_d_tl {}
          }
          {\PackageWarning{noname}{Falsches~Zeichen~(tl):~\l_zeichen_tl}}
      }
    \int_step_function:nnnN {1} {1} {\l_zeichenzahl_int} \zeichen_pruefen:n
  }
\cs_new_protected:Npn \test_mit_str:n #1
  {
    \int_set:Nn \l_zeichenzahl_int {\str_count_ignore_spaces:n {#1}}
    \cs_set:Npn \zeichen_pruefen:n ##1
      {
        \str_set:Nx \l_zeichen_str {\str_item_ignore_spaces:nn {#1} {##1}}
        \str_case:VnF {\l_zeichen_str}
          {
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Im Log:

Öffne in Overleaf
Package noname Warning: Falsches Zeichen (tl): 2 on input line 63.
Package noname Warning: Falsches Zeichen (str): 2 on input line 63.
Package noname Warning: Falsches Zeichen (tl): 2 on input line 65.
Package noname Warning: Falsches Zeichen (str): 2 on input line 65.
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Das ganze geht aber auch erheblich leichter:

Öffne in Overleaf
Code, hier editierbar zum Übersetzen:
\documentclass{article}
\usepackage{expl3,xparse}
\ExplSyntaxOn
\tl_new:N \l_check_input_allowed_tl
\tl_set:Nn \l_check_input_allowed_tl {01ab}
\cs_new_protected:Npn \check_input:n #1
  {
    \tl_map_inline:nn {#1}
      {
        \tl_if_in:NnF \l_check_input_allowed_tl {##1}
          { \PackageWarning {noname} {Falsche~ Zeichen:~ `##1'} }
      }
  }
\NewDocumentCommand \checkinput {m}
  { \check_input:n {#1} }
\ExplSyntaxOff
\begin{document}
\checkinput{}    
\checkinput{foo}
\checkinput{ab10}
\checkinput{a1b0}
\checkinput{a1c0}
\checkinput{ab 10}
\end{document}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Im Log:

Öffne in Overleaf
Package noname Warning: Falsche Zeichen: `f' on input line 26.
Package noname Warning: Falsche Zeichen: `o' on input line 26.
Package noname Warning: Falsche Zeichen: `o' on input line 26.
Package noname Warning: Falsche Zeichen: `c' on input line 29.
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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beantwortet 24 Mai '16, 13:20

cgnieder's gravatar image

cgnieder
22.1k●25●34●63
Akzeptiert-Rate: 60%

bearbeitet 09 Apr '17, 15:32

2

Ich würde das mit einer clist machen. Testet auch auf Leerzeichen und nutzt das l3msg-Interface für Warnungen.

Open in Online-Editor
Code, hier editierbar zum Übersetzen:
\documentclass{article}
\usepackage{xparse}
\ExplSyntaxOn
\clist_new:N \l_allowed_chars_clist
\clist_set:Nn \l_allowed_chars_clist { 0, 1, a, b }
\msg_new:nnn { noname } { erroneous-input } { Erroneous~character~`#1' }
\cs_new_protected:Npn \test_mit_tl:n #1
 {
  % Check for spaces
  \seq_set_split:Nnn \l_tmpa_seq { ~ } { #1 }
  \int_compare:nT { \seq_count:N \l_tmpa_seq > 1 }
   { \msg_warning:nnn { noname } { erroneous-input } { ~ } }
  % Check for invalid tokens
  \tl_map_inline:nn { #1 }
   {
    \clist_if_in:NnF \l_allowed_chars_clist { ##1 }
     { \msg_warning:nnn { noname } { erroneous-input } { ##1 } }
   }
 }
\NewDocumentCommand \Befehl {m}
 {
  \test_mit_tl:n {#1}
 }
\ExplSyntaxOff
\begin{document}
\Befehl{12 ab}
\end{document}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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beantwortet 23 Mai '16, 18:54

Henri's gravatar image

Henri
15.7k●13●39●43
Akzeptiert-Rate: 46%

bearbeitet 23 Mai '16, 22:33

Der zweite \seq_set_split-Befehl scheint mir da nicht mehr hinzupassen.

(23 Mai '16, 22:32) Cletus

@Cletus In der Tat. Das war noch ein Relikt aus früheren Versuchen.

(23 Mai '16, 22:34) Henri

Etwas unschön ist es, dass die Warnung zweimal ausgegeben wird (jeweils mit einem Fragezeichen anstelle des eigentlichen Zeichens), falls das falsche Zeichen ein Umlaut ist. Der Hintergrund ist mir klar: In UTF-8 werden Umlaute anders als gewöhnliche lateinische Buchstaben durch zwei Byte codiert. Aber kann eine moderne, in Unicode-Zeiten entstandene Sprache wie expl3 so etwas nicht angemessener behandeln?

(26 Mai '16, 00:26) Cletus

@Cletus Unicode-Engine (xelatex, lualatex) benutzen. Damit bekomme ich Erroneous character `ö'. In den alten 8-bit Engines kann man Unicode-Zeichen nicht anders kodieren als mit zwei Byte.

(26 Mai '16, 00:29) Henri
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