19 lines
571 B
Scheme
19 lines
571 B
Scheme
;--- String manipulation
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(define (string-suffix? src suffix)
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(let [(src-len (string-length src)) (suf-len (string-length suffix))]
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(and
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(>= src-len suf-len)
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(string=? suffix (substring src (- src-len suf-len) src-len))
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)))
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(define (string-prefix? src prefix)
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(let [(src-len (string-length src)) (pref-len (string-length prefix))]
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(and
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(>= src-len pref-len)
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(string=? prefix (substring src 0 pref-len))
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)))
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(define (string-contains? src elem) ; we use port logic to implement this one
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(seek-until (open-input-string src) elem))
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