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(in-package #:cl-user)
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(defpackage #:validation
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(:use #:cl
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#:app-constants)
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(:export #:has-static-assets-extention?
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#:is-valid-favicon-type?
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#:favicon-need-resizing?
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#:string-is-nil-or-empty?)
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(:documentation "Package for validating 'stuff'."))
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(in-package #:validation)
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(defun file-has-valid-static-assets-extention? (filename)
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(cond ((or (string= "css" (pathname-type filename))
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(string= "js" (pathname-type filename))
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(string= "png" (pathname-type filename))
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(string= "ico" (pathname-type filename))
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(string= "gif" (pathname-type filename))
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(string= "jpg" (pathname-type filename))
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(string= "svg" (pathname-type filename))
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(string= "txt" (pathname-type filename)))
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filename)
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(t nil)))
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(defun file-is-valid-favicon-type? (filename)
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"Returns path of file if `FILE' is a valid favicon.
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Valid file types are 'ico', 'gif' and 'png'."
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(cond ((or (string= "png" (pathname-type filename))
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(string= "ico" (pathname-type filename))
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(string= "gif" (pathname-type filename)))
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filename)
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(t nil)))
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(defun string-is-nil-or-empty? (string-to-test)
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"Tests to see if `STRING-TO-TEST' is empty of just whitespace.
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This is essentially the 'IsNullOrWhiteSpace' function I use in C#. It
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expands the 'empty string' check to include a check to see if there is
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string with just a '(white) space' in it."
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(if (or (string= string-to-test " ")
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(zerop (length string-to-test))
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(null string-to-test))
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t
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nil))
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(defun favicon-need-resizing? (dimensions)
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"Checks to see if the `WIDTH' or `HEIGHT' are greater than 192x192 pixels.
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`DIMENSIONS' is a cons list, with the `WIDTH' being first element and
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`HEIGHT' being the second. If either of them are, then you look into
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scaling down the image, using code in the `UTILS' package probably."
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(cond ((or (< 192 (car dimensions)) (< 192 (cdr dimensions)))
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t) ; True as in the dimensions are valid
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(t ;; Bit confusing with the use of `T' here but its standard
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;; practice to end `COND' with a catch-all `T'. In this
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;; case, `T' here means the dimensions are invalid, as in
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;; 'yes' the favicon needs resizing. This is confusing
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;; Boolean logic but when you call this function, the
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;; return types make sense from that point-of-view.
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nil)))
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