class JSqueeze in Minify JS 7
Hierarchy
- class \JSqueeze
Expanded class hierarchy of JSqueeze
File
- lib/
JSqueeze.php, line 63
View source
class JSqueeze {
const SPECIAL_VAR_PACKER = '(\\$+[a-zA-Z_]|_[a-zA-Z0-9$])[a-zA-Z0-9_$]*';
public $charFreq;
protected $strings, $closures, $str0, $str1, $argFreq, $specialVarRx, $keepImportantComments, $varRx = '(?:[a-zA-Z_$])[a-zA-Z0-9_$]*', $reserved = array(
// Literals
'true',
'false',
'null',
// ES6
'break',
'case',
'class',
'catch',
'const',
'continue',
'debugger',
'default',
'delete',
'do',
'else',
'export',
'extends',
'finally',
'for',
'function',
'if',
'import',
'in',
'instanceof',
'new',
'return',
'super',
'switch',
'this',
'throw',
'try',
'typeof',
'var',
'void',
'while',
'with',
'yield',
// Future
'enum',
// Strict mode
'implements',
'package',
'protected',
'static',
'let',
'interface',
'private',
'public',
// Module
'await',
// Older standards
'abstract',
'boolean',
'byte',
'char',
'double',
'final',
'float',
'goto',
'int',
'long',
'native',
'short',
'synchronized',
'throws',
'transient',
'volatile',
);
public function __construct() {
$this->reserved = array_flip($this->reserved);
$this->charFreq = array_fill(0, 256, 0);
}
/**
* Squeezes a JavaScript source code.
*
* Set $singleLine to false if you want optional
* semi-colons to be replaced by line feeds.
*
* Set $keepImportantComments to false if you want /*! comments to be removed.
*
* $specialVarRx defines the regular expression of special variables names
* for global vars, methods, properties and in string substitution.
* Set it to false if you don't want any.
*
* If the analysed javascript source contains a single line comment like
* this one, then the directive will overwrite $specialVarRx:
*
* // jsqueeze.specialVarRx = your_special_var_regexp_here
*
* Only the first directive is parsed, others are ignored. It is not possible
* to redefine $specialVarRx in the middle of the javascript source.
*
* Example:
* $parser = new JSqueeze;
* $squeezed_js = $parser->squeeze($fat_js);
*/
public function squeeze($code, $singleLine = true, $keepImportantComments = true, $specialVarRx = false) {
$code = trim($code);
if ('' === $code) {
return '';
}
$this->argFreq = array(
-1 => 0,
);
$this->specialVarRx = $specialVarRx;
$this->keepImportantComments = !!$keepImportantComments;
if (preg_match("#//[ \t]*jsqueeze\\.specialVarRx[ \t]*=[ \t]*([\"']?)(.*)\\1#i", $code, $key)) {
if (!$key[1]) {
$key[2] = trim($key[2]);
$key[1] = strtolower($key[2]);
$key[1] = $key[1] && $key[1] != 'false' && $key[1] != 'none' && $key[1] != 'off';
}
$this->specialVarRx = $key[1] ? $key[2] : false;
}
// Remove capturing parentheses
$this->specialVarRx && ($this->specialVarRx = preg_replace('/(?<!\\\\)((?:\\\\\\\\)*)\\((?!\\?)/', '(?:', $this->specialVarRx));
false !== strpos($code, "\r") && ($code = strtr(str_replace("\r\n", "\n", $code), "\r", "\n"));
false !== strpos($code, "
") && ($code = str_replace("
", "\n", $code));
// Next Line
false !== strpos($code, "
") && ($code = str_replace("
", "\n", $code));
// Line Separator
false !== strpos($code, "
") && ($code = str_replace("
", "\n", $code));
// Paragraph Separator
list($code, $this->strings) = $this
->extractStrings($code);
list($code, $this->closures) = $this
->extractClosures($code);
$key = "//''\"\"#0'";
// This crap has a wonderful property: it can not happen in any valid javascript, even in strings
$this->closures[$key] =& $code;
$tree = array(
$key => array(
'parent' => false,
),
);
$this
->makeVars($code, $tree[$key], $key);
$this
->renameVars($tree[$key], true);
$code = substr($tree[$key]['code'], 1);
$code = preg_replace("'\\breturn !'", 'return!', $code);
$code = preg_replace("'\\}(?=(else|while)[^\$.a-zA-Z0-9_])'", "}\r", $code);
$code = str_replace(array_keys($this->strings), array_values($this->strings), $code);
if ($singleLine) {
$code = strtr($code, "\n", ';');
}
else {
$code = str_replace("\n", ";\n", $code);
}
false !== strpos($code, "\r") && ($code = strtr(trim($code), "\r", "\n"));
// Cleanup memory
$this->charFreq = array_fill(0, 256, 0);
$this->strings = $this->closures = $this->argFreq = array();
$this->str0 = $this->str1 = '';
return $code;
}
protected function extractStrings($f) {
if ($cc_on = false !== strpos($f, '@cc_on')) {
// Protect conditional comments from being removed
$f = str_replace('#', '##', $f);
$f = str_replace('/*@', '1#@', $f);
$f = preg_replace("'//@([^\n]+)'", '2#@$1@#3', $f);
$f = str_replace('@*/', '@#1', $f);
}
$len = strlen($f);
$code = str_repeat(' ', $len);
$j = 0;
$strings = array();
$K = 0;
$instr = false;
$q = array(
"'",
'"',
"'" => 0,
'"' => 0,
);
// Extract strings, removes comments
for ($i = 0; $i < $len; ++$i) {
if ($instr) {
if ('//' == $instr) {
if ("\n" == $f[$i]) {
$f[$i--] = ' ';
$instr = false;
}
}
elseif ($f[$i] == $instr || '/' == $f[$i] && "/'" == $instr) {
if ('!' == $instr) {
}
elseif ('*' == $instr) {
if ('/' == $f[$i + 1]) {
++$i;
$instr = false;
}
}
else {
if ("/'" == $instr) {
while (isset($f[$i + 1]) && false !== strpos('gmi', $f[$i + 1])) {
$s[] = $f[$i++];
}
$s[] = $f[$i];
}
$instr = false;
}
}
elseif ('*' == $instr) {
}
elseif ('!' == $instr) {
if ('*' == $f[$i] && '/' == $f[$i + 1]) {
$s[] = "*/\r";
++$i;
$instr = false;
}
elseif ("\n" == $f[$i]) {
$s[] = "\r";
}
else {
$s[] = $f[$i];
}
}
elseif ('\\' == $f[$i]) {
++$i;
if ("\n" != $f[$i]) {
isset($q[$f[$i]]) && ++$q[$f[$i]];
$s[] = '\\' . $f[$i];
}
}
elseif ('[' == $f[$i] && "/'" == $instr) {
$instr = '/[';
$s[] = '[';
}
elseif (']' == $f[$i] && '/[' == $instr) {
$instr = "/'";
$s[] = ']';
}
elseif ("'" == $f[$i] || '"' == $f[$i]) {
++$q[$f[$i]];
$s[] = '\\' . $f[$i];
}
else {
$s[] = $f[$i];
}
}
else {
switch ($f[$i]) {
case ';':
// Remove triple semi-colon
if ($i > 0 && ';' == $f[$i - 1] && $i + 1 < $len && ';' == $f[$i + 1]) {
$f[$i] = $f[$i + 1] = '/';
}
else {
$code[++$j] = ';';
break;
}
case '/':
if ('*' == $f[$i + 1]) {
++$i;
$instr = '*';
if ($this->keepImportantComments && '!' == $f[$i + 1]) {
++$i;
// no break here
}
else {
break;
}
}
elseif ('/' == $f[$i + 1]) {
++$i;
$instr = '//';
break;
}
else {
$a = $j && (' ' == $code[$j] || "" == $code[$j]) ? $code[$j - 1] : $code[$j];
if (false !== strpos('-!%&;<=>~:^+|,()*?[{} ', $a) || false !== strpos('oenfd', $a) && preg_match("'(?<![\$.a-zA-Z0-9_])(do|else|return|typeof|yield[ ]?\\*?)[ ]?\$'", substr($code, $j - 7, 8))) {
if (')' === $a && $j > 1) {
$a = 1;
$k = $j - (' ' == $code[$j] || "" == $code[$j]) - 1;
while ($k >= 0 && $a) {
if ('(' === $code[$k]) {
--$a;
}
elseif (')' === $code[$k]) {
++$a;
}
--$k;
}
if (!preg_match("'(?<![\$.a-zA-Z0-9_])(if|for|while)[ ]?\$'", substr($code, 0, $k + 1))) {
$code[++$j] = '/';
break;
}
}
$key = "//''\"\"" . $K++ . ($instr = "/'");
$a = $j;
$code .= $key;
while (isset($key[++$j - $a - 1])) {
$code[$j] = $key[$j - $a - 1];
}
--$j;
isset($s) && ($s = implode('', $s)) && $cc_on && $this
->restoreCc($s);
$strings[$key] = array(
'/',
);
$s =& $strings[$key];
}
else {
$code[++$j] = '/';
}
break;
}
case "'":
case '"':
$instr = $f[$i];
$key = "//''\"\"" . $K++ . ('!' == $instr ? ']' : "'");
$a = $j;
$code .= $key;
while (isset($key[++$j - $a - 1])) {
$code[$j] = $key[$j - $a - 1];
}
--$j;
isset($s) && ($s = implode('', $s)) && $cc_on && $this
->restoreCc($s);
$strings[$key] = array();
$s =& $strings[$key];
'!' == $instr && ($s[] = "\r/*!");
break;
case "\n":
if ($j > 3) {
if (' ' == $code[$j] || "" == $code[$j]) {
--$j;
}
$code[++$j] = false !== strpos('kend+-', $code[$j - 1]) && preg_match("'(?:\\+\\+|--|(?<![\$.a-zA-Z0-9_])(break|continue|return|yield[ ]?\\*?))[ ]?\$'", substr($code, $j - 8, 9)) ? ';' : "";
break;
}
case "\t":
$f[$i] = ' ';
case ' ':
if (!$j || ' ' == $code[$j] || "" == $code[$j]) {
break;
}
default:
$code[++$j] = $f[$i];
}
}
}
isset($s) && ($s = implode('', $s)) && $cc_on && $this
->restoreCc($s);
unset($s);
$code = substr($code, 0, $j + 1);
$cc_on && $this
->restoreCc($code, false);
// Protect wanted spaces and remove unwanted ones
$code = strtr($code, "", ' ');
$code = str_replace('- -', "--", $code);
$code = str_replace('+ +', "++", $code);
$code = preg_replace("'(\\d)\\s+\\.\\s*([a-zA-Z\$_[(])'", "\$1.\$2", $code);
$code = preg_replace("# ([-!%&;<=>~:.^+|,()*?[\\]{}/']+)#", '$1', $code);
$code = preg_replace("#([-!%&;<=>~:.^+|,()*?[\\]{}/]+) #", '$1', $code);
$cc_on && ($code = preg_replace_callback("'//[^\\'].*?@#3'", function ($m) {
return strtr($m[0], ' ', "");
}, $code));
// Replace new Array/Object by []/{}
false !== strpos($code, 'new Array') && ($code = preg_replace("'new Array(?:\\(\\)|([;\\])},:]))'", '[]$1', $code));
false !== strpos($code, 'new Object') && ($code = preg_replace("'new Object(?:\\(\\)|([;\\])},:]))'", '{}$1', $code));
// Add missing semi-colons after curly braces
// This adds more semi-colons than strictly needed,
// but it seems that later gzipping is favorable to the repetition of "};"
$code = preg_replace("'\\}(?![:,;.()\\[\\]}\\|&]|(else|catch|finally|while)[^\$.a-zA-Z0-9_])'", '};', $code);
// Tag possible empty instruction for easy detection
$code = preg_replace("'(?<![\$.a-zA-Z0-9_])if\\('", '1#(', $code);
$code = preg_replace("'(?<![\$.a-zA-Z0-9_])for\\('", '2#(', $code);
$code = preg_replace("'(?<![\$.a-zA-Z0-9_])while\\('", '3#(', $code);
$forPool = array();
$instrPool = array();
$s = 0;
$f = array();
$j = -1;
// Remove as much semi-colon as possible
$len = strlen($code);
for ($i = 0; $i < $len; ++$i) {
switch ($code[$i]) {
case '(':
if ($j >= 0 && "\n" == $f[$j]) {
$f[$j] = ';';
}
++$s;
if ($i && '#' == $code[$i - 1]) {
$instrPool[$s - 1] = 1;
if ('2' == $code[$i - 2]) {
$forPool[$s] = 1;
}
}
$f[++$j] = '(';
break;
case ']':
case ')':
if ($i + 1 < $len && !isset($forPool[$s]) && !isset($instrPool[$s - 1]) && preg_match("'[a-zA-Z0-9_\$]'", $code[$i + 1])) {
$f[$j] .= $code[$i];
$f[++$j] = "\n";
}
else {
$f[++$j] = $code[$i];
}
if (')' == $code[$i]) {
unset($forPool[$s]);
--$s;
}
continue 2;
case '}':
if ("\n" == $f[$j]) {
$f[$j] = '}';
}
else {
$f[++$j] = '}';
}
break;
case ';':
if (isset($forPool[$s]) || isset($instrPool[$s])) {
$f[++$j] = ';';
}
elseif ($j >= 0 && "\n" != $f[$j] && ';' != $f[$j]) {
$f[++$j] = "\n";
}
break;
case '#':
switch ($f[$j]) {
case '1':
$f[$j] = 'if';
break 2;
case '2':
$f[$j] = 'for';
break 2;
case '3':
$f[$j] = 'while';
break 2;
}
case '[':
if ($j >= 0 && "\n" == $f[$j]) {
$f[$j] = ';';
}
default:
$f[++$j] = $code[$i];
}
unset($instrPool[$s]);
}
$f = implode('', $f);
$cc_on && ($f = str_replace('@#3', "\r", $f));
// Fix "else ;" empty instructions
$f = preg_replace("'(?<![\$.a-zA-Z0-9_])else\n'", "\n", $f);
$r1 = array(
// keywords with a direct object
'case',
'delete',
'do',
'else',
'function',
'in',
'instanceof',
'of',
'break',
'new',
'return',
'throw',
'typeof',
'var',
'void',
'yield',
'let',
'if',
'const',
'get',
'set',
);
$r2 = array(
// keywords with a subject
'in',
'instanceof',
'of',
);
// Fix missing semi-colons
$f = preg_replace("'(?<!(?<![a-zA-Z0-9_\$])" . implode(')(?<!(?<![a-zA-Z0-9_\\$])', $r1) . ') (?!(' . implode('|', $r2) . ")(?![a-zA-Z0-9_\$]))'", "\n", $f);
$f = preg_replace("'(?<!(?<![a-zA-Z0-9_\$])do)(?<!(?<![a-zA-Z0-9_\$])else) if\\('", "\nif(", $f);
$f = preg_replace("'(?<=--|\\+\\+)(?<![a-zA-Z0-9_\$])(" . implode('|', $r1) . ")(?![a-zA-Z0-9_\$])'", "\n\$1", $f);
$f = preg_replace("'(?<![a-zA-Z0-9_\$])for\neach\\('", 'for each(', $f);
$f = preg_replace("'(?<![a-zA-Z0-9_\$])\n(" . implode('|', $r2) . ")(?![a-zA-Z0-9_\$])'", '$1', $f);
// Merge strings
if ($q["'"] > $q['"']) {
$q = array(
$q[1],
$q[0],
);
}
$f = preg_replace("#//''\"\"[0-9]+'#", $q[0] . '$0' . $q[0], $f);
strpos($f, $q[0] . '+' . $q[0]) && ($f = str_replace($q[0] . '+' . $q[0], '', $f));
$len = count($strings);
foreach ($strings as $r1 => &$r2) {
$r2 = "/'" == substr($r1, -2) ? str_replace(array(
"\\'",
'\\"',
), array(
"'",
'"',
), $r2) : str_replace('\\' . $q[1], $q[1], $r2);
}
// Restore wanted spaces
$f = strtr($f, "", ' ');
return array(
$f,
$strings,
);
}
protected function extractClosures($code) {
$code = ';' . $code;
$this->argFreq[-1] += substr_count($code, '}catch(');
if ($this->argFreq[-1]) {
// Special catch scope handling
// FIXME: this implementation doesn't work with nested catch scopes who need
// access to their parent's caught variable (but who needs that?).
$f = preg_split("@}catch\\(({$this->varRx})@", $code, -1, PREG_SPLIT_DELIM_CAPTURE);
$code = 'catch$scope$var' . mt_rand();
$this->specialVarRx = $this->specialVarRx ? '(?:' . $this->specialVarRx . '|' . preg_quote($code) . ')' : preg_quote($code);
$i = count($f) - 1;
while ($i) {
$c = 1;
$j = 0;
$l = strlen($f[$i]);
while ($c && $j < $l) {
$s = $f[$i][$j++];
$c += '(' == $s ? 1 : (')' == $s ? -1 : 0);
}
if (!$c) {
do {
$s = $f[$i][$j++];
$c += '{' == $s ? 1 : ('}' == $s ? -1 : 0);
} while ($c && $j < $l);
}
$c = preg_quote($f[$i - 1], '#');
$f[$i - 2] .= '}catch(' . preg_replace("#([.,{]?)(?<![a-zA-Z0-9_\$@]){$c}\\b#", '$1' . $code, $f[$i - 1] . substr($f[$i], 0, $j)) . substr($f[$i], $j);
unset($f[$i--], $f[$i--]);
}
$code = $f[0];
}
$f = preg_split("'(?<![a-zA-Z0-9_\$])((?:function[ (]|get |set ).*?\\{)'", $code, -1, PREG_SPLIT_DELIM_CAPTURE);
$i = count($f) - 1;
$closures = array();
while ($i) {
$c = 1;
$j = 0;
$l = strlen($f[$i]);
while ($c && $j < $l) {
$s = $f[$i][$j++];
$c += '{' == $s ? 1 : ('}' == $s ? -1 : 0);
}
switch (substr($f[$i - 2], -1)) {
default:
if (false !== ($c = strpos($f[$i - 1], ' ', 8))) {
break;
}
case false:
case "\n":
case ';':
case '{':
case '}':
case ')':
case ']':
$c = strpos($f[$i - 1], '(', 4);
}
$l = "//''\"\"#{$i}'";
$code = substr($f[$i - 1], $c);
$closures[$l] = $code . substr($f[$i], 0, $j);
$f[$i - 2] .= substr($f[$i - 1], 0, $c) . $l . substr($f[$i], $j);
if ('(){' !== $code) {
$j = substr_count($code, ',');
do {
isset($this->argFreq[$j]) ? ++$this->argFreq[$j] : ($this->argFreq[$j] = 1);
} while ($j--);
}
$i -= 2;
}
return array(
$f[0],
$closures,
);
}
protected function makeVars($closure, &$tree, $key) {
$tree['code'] =& $closure;
$tree['nfe'] = false;
$tree['used'] = array();
$tree['local'] = array();
// Replace multiple "var" declarations by a single one
$closure = preg_replace_callback("'(?<=[\n\\{\\}])var [^\n\\{\\};]+(?:\nvar [^\n\\{\\};]+)+'", array(
$this,
'mergeVarDeclarations',
), $closure);
// Get all local vars (functions, arguments and "var" prefixed)
$vars =& $tree['local'];
if (preg_match("'^( [^(]*)?\\((.*?)\\)\\{'", $closure, $v)) {
if ($v[1]) {
$vars[$tree['nfe'] = substr($v[1], 1)] = -1;
$tree['parent']['local'][';' . $key] =& $vars[$tree['nfe']];
}
if ($v[2]) {
$i = 0;
$v = explode(',', $v[2]);
foreach ($v as $w) {
$vars[$w] = $this->argFreq[$i++] - 1;
// Give a bonus to argument variables
}
}
}
$v = preg_split("'(?<![\$.a-zA-Z0-9_])var '", $closure);
if ($i = count($v) - 1) {
$w = array();
while ($i) {
$j = $c = 0;
$l = strlen($v[$i]);
while ($j < $l) {
switch ($v[$i][$j]) {
case '(':
case '[':
case '{':
++$c;
break;
case ')':
case ']':
case '}':
if ($c-- <= 0) {
break 2;
}
break;
case ';':
case "\n":
if (!$c) {
break 2;
}
default:
$c || ($w[] = $v[$i][$j]);
}
++$j;
}
$w[] = ',';
--$i;
}
$v = explode(',', implode('', $w));
foreach ($v as $w) {
if (preg_match("'^{$this->varRx}'", $w, $v)) {
isset($vars[$v[0]]) || ($vars[$v[0]] = 0);
}
}
}
if (preg_match_all("@function ({$this->varRx})//''\"\"#@", $closure, $v)) {
foreach ($v[1] as $w) {
isset($vars[$w]) || ($vars[$w] = 0);
}
}
if ($this->argFreq[-1] && preg_match_all("@}catch\\(({$this->varRx})@", $closure, $v)) {
$v[0] = array();
foreach ($v[1] as $w) {
isset($v[0][$w]) ? ++$v[0][$w] : ($v[0][$w] = 1);
}
foreach ($v[0] as $w => $v) {
$vars[$w] = $this->argFreq[-1] - $v;
}
}
// Get all used vars, local and non-local
$vars =& $tree['used'];
if (preg_match_all("#([.,{]?(?:[gs]et )?)(?<![a-zA-Z0-9_\$])({$this->varRx})(:?)#", $closure, $w, PREG_SET_ORDER)) {
foreach ($w as $k) {
if (isset($k[1][0]) && (',' === $k[1][0] || '{' === $k[1][0])) {
if (':' === $k[3]) {
$k = '.' . $k[2];
}
elseif ('get ' === substr($k[1], 1, 4) || 'set ' === substr($k[1], 1, 4)) {
++$this->charFreq[ord($k[1][1])];
// "g" or "s"
++$this->charFreq[101];
// "e"
++$this->charFreq[116];
// "t"
$k = '.' . $k[2];
}
else {
$k = $k[2];
}
}
else {
$k = $k[1] . $k[2];
}
isset($vars[$k]) ? ++$vars[$k] : ($vars[$k] = 1);
}
}
if (preg_match_all("#//''\"\"[0-9]+(?:['!]|/')#", $closure, $w)) {
foreach ($w[0] as $a) {
$v = "'" === substr($a, -1) && "/'" !== substr($a, -2) && $this->specialVarRx ? preg_split("#([.,{]?(?:[gs]et )?(?<![a-zA-Z0-9_\$@]){$this->specialVarRx}:?)#", $this->strings[$a], -1, PREG_SPLIT_DELIM_CAPTURE) : array(
$this->strings[$a],
);
$a = count($v);
for ($i = 0; $i < $a; ++$i) {
$k = $v[$i];
if (1 === $i % 2) {
if (',' === $k[0] || '{' === $k[0]) {
if (':' === substr($k, -1)) {
$k = '.' . substr($k, 1, -1);
}
elseif ('get ' === substr($k, 1, 4) || 'set ' === substr($k, 1, 4)) {
++$this->charFreq[ord($k[1])];
// "g" or "s"
++$this->charFreq[101];
// "e"
++$this->charFreq[116];
// "t"
$k = '.' . substr($k, 5);
}
else {
$k = substr($k, 1);
}
}
elseif (':' === substr($k, -1)) {
$k = substr($k, 0, -1);
}
$w =& $tree;
while (isset($w['parent']) && !(isset($w['used'][$k]) || isset($w['local'][$k]))) {
$w =& $w['parent'];
}
(isset($w['used'][$k]) || isset($w['local'][$k])) && (isset($vars[$k]) ? ++$vars[$k] : ($vars[$k] = 1));
unset($w);
}
if (0 === $i % 2 || !isset($vars[$k])) {
foreach (count_chars($v[$i], 1) as $k => $w) {
$this->charFreq[$k] += $w;
}
}
}
}
}
// Propagate the usage number to parents
foreach ($vars as $w => $a) {
$k =& $tree;
$chain = array();
do {
$vars =& $k['local'];
$chain[] =& $k;
if (isset($vars[$w])) {
unset($k['used'][$w]);
if (isset($vars[$w])) {
$vars[$w] += $a;
}
else {
$vars[$w] = $a;
}
$a = false;
break;
}
} while ($k['parent'] && ($k =& $k['parent']));
if ($a && !$k['parent']) {
if (isset($vars[$w])) {
$vars[$w] += $a;
}
else {
$vars[$w] = $a;
}
}
if (isset($tree['used'][$w]) && isset($vars[$w])) {
foreach ($chain as &$b) {
isset($b['local'][$w]) || ($b['used'][$w] =& $vars[$w]);
}
}
}
// Analyse childs
$tree['childs'] = array();
$vars =& $tree['childs'];
if (preg_match_all("@//''\"\"#[0-9]+'@", $closure, $w)) {
foreach ($w[0] as $a) {
$vars[$a] = array(
'parent' => &$tree,
);
$this
->makeVars($this->closures[$a], $vars[$a], $a);
}
}
}
protected function mergeVarDeclarations($m) {
return str_replace("\nvar ", ',', $m[0]);
}
protected function renameVars(&$tree, $root) {
if ($root) {
$tree['local'] += $tree['used'];
$tree['used'] = array();
foreach ($tree['local'] as $k => $v) {
if ('.' == $k[0]) {
$k = substr($k, 1);
}
if ('true' === $k) {
$this->charFreq[48] += $v;
}
elseif ('false' === $k) {
$this->charFreq[49] += $v;
}
elseif (!$this->specialVarRx || !preg_match("#^{$this->specialVarRx}\$#", $k)) {
foreach (count_chars($k, 1) as $k => $w) {
$this->charFreq[$k] += $w * $v;
}
}
elseif (2 == strlen($k)) {
$tree['used'][] = $k[1];
}
}
$this->charFreq = $this
->rsort($this->charFreq);
$this->str0 = '';
$this->str1 = '';
foreach ($this->charFreq as $k => $v) {
if (!$v) {
break;
}
$v = chr($k);
if (64 < $k && $k < 91 || 96 < $k && $k < 123) {
// A-Z a-z
$this->str0 .= $v;
$this->str1 .= $v;
}
elseif (47 < $k && $k < 58) {
// 0-9
$this->str1 .= $v;
}
}
if ('' === $this->str0) {
$this->str0 = 'claspemitdbfrugnjvhowkxqyzCLASPEMITDBFRUGNJVHOWKXQYZ';
$this->str1 = $this->str0 . '0123456789';
}
foreach ($tree['local'] as $var => $root) {
if ('.' != substr($var, 0, 1) && isset($tree['local'][".{$var}"])) {
$tree['local'][$var] += $tree['local'][".{$var}"];
}
}
foreach ($tree['local'] as $var => $root) {
if ('.' == substr($var, 0, 1) && isset($tree['local'][substr($var, 1)])) {
$tree['local'][$var] = $tree['local'][substr($var, 1)];
}
}
$tree['local'] = $this
->rsort($tree['local']);
foreach ($tree['local'] as $var => $root) {
switch (substr($var, 0, 1)) {
case '.':
if (!isset($tree['local'][substr($var, 1)])) {
$tree['local'][$var] = '#' . ($this->specialVarRx && 3 < strlen($var) && preg_match("'^\\.{$this->specialVarRx}\$'", $var) ? $this
->getNextName($tree) . '$' : substr($var, 1));
}
break;
case ';':
$tree['local'][$var] = 0 === $root ? '' : $this
->getNextName($tree);
case '#':
break;
default:
$root = $this->specialVarRx && 2 < strlen($var) && preg_match("'^{$this->specialVarRx}\$'", $var) ? $this
->getNextName($tree) . '$' : $var;
$tree['local'][$var] = $root;
if (isset($tree['local'][".{$var}"])) {
$tree['local'][".{$var}"] = '#' . $root;
}
}
}
foreach ($tree['local'] as $var => $root) {
$tree['local'][$var] = preg_replace("'^#'", '.', $tree['local'][$var]);
}
}
else {
$tree['local'] = $this
->rsort($tree['local']);
if (false !== $tree['nfe']) {
$tree['used'][] = $tree['local'][$tree['nfe']];
}
foreach ($tree['local'] as $var => $root) {
if ($tree['nfe'] !== $var) {
$tree['local'][$var] = 0 === $root ? '' : $this
->getNextName($tree);
}
}
}
$this->local_tree =& $tree['local'];
$this->used_tree =& $tree['used'];
$tree['code'] = preg_replace_callback("#[.,{ ]?(?:[gs]et )?(?<![a-zA-Z0-9_\$@]){$this->varRx}:?#", array(
$this,
'getNewName',
), $tree['code']);
if ($this->specialVarRx && preg_match_all("#//''\"\"[0-9]+'#", $tree['code'], $b)) {
foreach ($b[0] as $a) {
$this->strings[$a] = preg_replace_callback("#[.,{]?(?:[gs]et )?(?<![a-zA-Z0-9_\$@]){$this->specialVarRx}:?#", array(
$this,
'getNewName',
), $this->strings[$a]);
}
}
foreach ($tree['childs'] as $a => &$b) {
$this
->renameVars($b, false);
$tree['code'] = str_replace($a, $b['code'], $tree['code']);
unset($tree['childs'][$a]);
}
}
protected function getNewName($m) {
$m = $m[0];
$pre = '.' === $m[0] ? '.' : '';
$post = '';
if (',' === $m[0] || '{' === $m[0] || ' ' === $m[0]) {
$pre = $m[0];
if (':' === substr($m, -1)) {
$post = ':';
$m = (' ' !== $m[0] ? '.' : '') . substr($m, 1, -1);
}
elseif ('get ' === substr($m, 1, 4) || 'set ' === substr($m, 1, 4)) {
$pre .= substr($m, 1, 4);
$m = '.' . substr($m, 5);
}
else {
$m = substr($m, 1);
}
}
elseif (':' === substr($m, -1)) {
$post = ':';
$m = substr($m, 0, -1);
}
$post = (isset($this->reserved[$m]) ? 'true' === $m ? '!0' : ('false' === $m ? '!1' : $m) : (isset($this->local_tree[$m]) ? $this->local_tree[$m] : (isset($this->used_tree[$m]) ? $this->used_tree[$m] : $m))) . $post;
return '' === $post ? '' : $pre . ('.' === $post[0] ? substr($post, 1) : $post);
}
protected function getNextName(&$tree = array(), &$counter = false) {
if (false === $counter) {
$counter =& $tree['counter'];
isset($counter) || ($counter = -1);
$exclude = array_flip($tree['used']);
}
else {
$exclude = $tree;
}
++$counter;
$len0 = strlen($this->str0);
$len1 = strlen($this->str0);
$name = $this->str0[$counter % $len0];
$i = intval($counter / $len0) - 1;
while ($i >= 0) {
$name .= $this->str1[$i % $len1];
$i = intval($i / $len1) - 1;
}
return !(isset($this->reserved[$name]) || isset($exclude[$name])) ? $name : $this
->getNextName($exclude, $counter);
}
protected function restoreCc(&$s, $lf = true) {
$lf && ($s = str_replace('@#3', '', $s));
$s = str_replace('@#1', '@*/', $s);
$s = str_replace('2#@', '//@', $s);
$s = str_replace('1#@', '/*@', $s);
$s = str_replace('##', '#', $s);
}
private function rsort($array) {
if (!$array) {
return $array;
}
$i = 0;
$tuples = array();
foreach ($array as $k => &$v) {
$tuples[] = array(
++$i,
$k,
&$v,
);
}
usort($tuples, function ($a, $b) {
if ($b[2] > $a[2]) {
return 1;
}
if ($b[2] < $a[2]) {
return -1;
}
if ($b[0] > $a[0]) {
return -1;
}
if ($b[0] < $a[0]) {
return 1;
}
return 0;
});
$array = array();
foreach ($tuples as $t) {
$array[$t[1]] =& $t[2];
}
return $array;
}
}Members
Name |
Modifiers | Type | Description | Overrides |
|---|---|---|---|---|
|
JSqueeze:: |
public | property | ||
|
JSqueeze:: |
protected | property | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
protected | function | ||
|
JSqueeze:: |
private | function | ||
|
JSqueeze:: |
constant | |||
|
JSqueeze:: |
public | function | Squeezes a JavaScript source code. | |
|
JSqueeze:: |
public | function |