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[refactor] Use range() function instead of string increment (#367)
This was found during the analysis for https://wiki.php.net/rfc/saner-inc-dec-operators I don't know what is the minimal version targeted, so the line which defines ``$c`` may need to be changes to use ``array_merge()``
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@ -10,23 +10,21 @@ class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
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public function __construct()
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{
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$this->mask = '_- ';
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for ($c = 'a'; $c <= 'z'; $c++) {
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$this->mask .= $c;
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}
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for ($c = 'A'; $c <= 'Z'; $c++) {
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$this->mask .= $c;
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}
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for ($c = '0'; $c <= '9'; $c++) {
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$this->mask .= $c;
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} // cast-y, but should be fine
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// special bytes used by UTF-8
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for ($i = 0x80; $i <= 0xFF; $i++) {
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// We don't bother excluding invalid bytes in this range,
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// because the our restriction of well-formed UTF-8 will
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// prevent these from ever occurring.
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$this->mask .= chr($i);
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}
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// Lowercase letters
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$l = range('a', 'z');
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// Uppercase letters
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$u = range('A', 'Z');
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// Digits
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$d = range('0', '9');
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// Special bytes used by UTF-8
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$b = array_map('chr', range(0x80, 0xFF));
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// All valid characters for the mask
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$c = array_merge($l, $u, $d, $b);
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// Concatenate all valid characters into a string
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// Use '_- ' as an initial value
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$this->mask = array_reduce($c, function ($carry, $value) {
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return $carry . $value;
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}, '_- ');
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/*
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PHP's internal strcspn implementation is
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