File extension is in extensions list: Difference between revisions
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(→{{header|Perl 6}}: disallow slash too) |
(→{{header|REXX}}: added support for blanks in the filename and/or file extension.) |
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:::* handle cases of the filename ending in a period |
:::* handle cases of the filename ending in a period |
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:::* handle cases of the filename ending in multiple periods |
:::* handle cases of the filename ending in multiple periods |
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:::* handle cases of blanks in the filename and/or extension |
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<lang rexx>/*REXX program displays if a filename has a known extension (per a list)*/ |
<lang rexx>/*REXX program displays if a filename has a known extension (per a list)*/ |
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/*╔════════════════════════════════════════════════════════════════════╗ |
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| ⚫ | |||
║ The list of extenions below have blanks encoded as 'ff'x. ║ |
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║ The extension pointed to has a 'ff'x after the period──────────┐ ║ |
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║ (which is used to indicate a true blank, due to │ ║ |
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║ REXX's use of blanks in lists as delimitors). │ ║ |
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╚══════════════════════════════════════════════════════════════════↓═╝*/ |
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| ⚫ | |||
/* [↑] above would be some EXTs.*/ |
/* [↑] above would be some EXTs.*/ |
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parse arg fn /*get the filename from the C.L. */ |
parse arg fn /*get the filename from the C.L. */ |
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fn=strip(fn) /*remove any superfluous blanks. */ |
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if fn=='' then exit /*No fn specified? Then exit.*/ |
if fn=='' then exit /*No fn specified? Then exit.*/ |
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afn=translate(fn,'/',"\") |
afn=translate( fn, '/', "\") /*handle both versions of pathSep*/ |
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afn= |
afn=translate(afn, 'ff'x, " ") /*··· and also handle true blanks*/ |
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afn=substr(afn,lastpos('/',afn)+1) /*pick off the filename from path*/ |
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p=lastpos('.',afn) /*find the last position of a dot*/ |
p=lastpos('.',afn) /*find the last position of a dot*/ |
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if p==0 | p==length(afn) then do /*no dot or dot is at end of name*/ |
if p==0 | p==length(afn) then do /*no dot or dot is at end of name*/ |
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end |
end |
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ft=substr(afn,p) /*pickoff the fileType (fileExt).*/ |
ft=substr(afn,p) /*pickoff the fileType (fileExt).*/ |
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say 'ft=' ft |
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upper ft extensions /*uppercase a couple of REXX vars*/ |
upper ft extensions /*uppercase a couple of REXX vars*/ |
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if wordpos(ft,extensions)==0 then _='an unknown' |
if wordpos(ft,extensions)==0 then _='an unknown' |
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