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jsprintf.php
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Sun, Jan 5, 06:08

jsprintf.php
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<?php
/**
* Format a Javascript string, using JSON to export complex values. This
* function behaves like `sprintf`, except that all the normal conversions
* (like "%s") will be properly escaped, and additional conversions are
* supported:
*
* %O (Object)
* Converts the argument to a JSON object.
*
* %A (Array)
* Converts the argument to a JSON array.
*
* %b (Boolean)
* Converts a value to either `true' or `false'.
*
* %# (FBID)
* JavaScript has issues with 64-bit numbers so we use this as our
* transport mechanism from PHP to JavaScript
*
* %J (Javascript)
* Inserts raw, unescaped Javascript. This is DANGEROUS because it WILL
* NOT BE ESCAPED.
*/
function jsprintf($pattern /* , ... */) {
$args = func_get_args();
return xsprintf('xsprintf_javascript', null, $args);
}
function vjsprintf($pattern, array $argv) {
array_unshift($argv, $pattern);
return xsprintf('xsprintf_javascript', null, $argv);
}
/**
* @{function:xsprintf} callback for JavaScript encoding.
*/
function xsprintf_javascript($userdata, &$pattern, &$pos, &$value, &$length) {
$type = $pattern[$pos];
switch ($type) {
case '#':
case 's':
$value = json_encode((string)$value);
$type = 's';
break;
case 'A':
if (!is_array($value)) {
$value = array();
}
$value = json_encode(array_values($value));
$type = 's';
break;
case 'O':
if ($value !== null) {
$value = (object)$value;
}
$value = json_encode($value);
$type = 's';
break;
case 'J':
$type = 's';
break;
case 'b':
$value = $value ? 'true' : 'false';
$type = 's';
break;
case 'd':
if ($value > 0x1FFFFFFFFFFFFF) {
throw new RangeException(
pht(
"You are passing an integer to %s which is so large it can ".
"not be represented without loss of precision by Javascript's ".
"native %s class. Use %%# instead.",
'jsprintf()',
'Number'));
}
break;
}
$pattern[$pos] = $type;
}

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