diff options
Diffstat (limited to 'buildscripts/jsbuilder/jsmin.php')
| -rw-r--r-- | buildscripts/jsbuilder/jsmin.php | 668 |
1 files changed, 668 insertions, 0 deletions
diff --git a/buildscripts/jsbuilder/jsmin.php b/buildscripts/jsbuilder/jsmin.php new file mode 100644 index 00000000..4abf1b34 --- /dev/null +++ b/buildscripts/jsbuilder/jsmin.php @@ -0,0 +1,668 @@ +<?php
+
+/**
+* JSMin.php (for PHP 5)
+*
+* PHP adaptation of JSMin, published by Douglas Crockford as jsmin.c, also based
+* on its Java translation by John Reilly.
+*
+* Permission is hereby granted to use the PHP version under the same conditions
+* as jsmin.c, which has the following notice :
+*
+* ----------------------------------------------------------------------------
+*
+* Copyright (c) 2002 Douglas Crockford (www.crockford.com)
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy of
+* this software and associated documentation files (the "Software"), to deal in
+* the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+* of the Software, and to permit persons to whom the Software is furnished to do
+* so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+*
+* The Software shall be used for Good, not Evil.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*
+* ----------------------------------------------------------------------------
+*
+* @copyright No new copyright ; please keep above and following information.
+* @author David Holmes <dholmes@cfdsoftware.net> of CFD Labs, France
+* @version 0.1 (PHP translation) 2006-04-11
+*
+* Please note, this is a brutal and simple conversion : it could undoubtedly be
+* improved, as a PHP implementation, by applying more PHP-specific programming
+* features.
+*
+* PHP 5 is required because OO style of programming is used, as well as classes
+* from the Standard PHP Library (SPL).
+*
+* Note : whereas jsmin.c works specifically with the standard input and output
+* streams, this implementation only falls back on them if file pathnames are
+* not provided to the JSMin() constructor.
+*
+* Examples comparing with the application compiled from jsmin.c :
+*
+* jsmin < orig.js > mini.js JSMin.php orig.js mini.js
+* JSMin.php orig.js > mini.js
+* JSMin.php - mini.js < orig.js
+* jsmin < orig.js JSMin.php orig.js
+* JSMin.php orig.js -
+* jsmin > mini.js JSMin.php - mini.js
+* JSMin.php > mini.js
+* jsmin comm1 comm2 < a.js > b.js JSMin.php a.js b.js comm1 comm2
+* JSMin.php a.js b.js -c comm1 comm2
+* JSMin.php a.js --comm comm1 comm2 > b.js
+* JSMin.php -c comm1 comm2 < a.js > b.js
+* (etc...)
+*
+* See JSMin.php -h (or --help) for command-line documentation.
+*/
+
+/**
+* Version of this PHP translation.
+*/
+
+define('VERSION', '0.1');
+
+/**
+* How fgetc() reports an End Of File.
+* N.B. : use === and not == to test the result of fgetc() ! (see manual)
+*/
+
+define('EOF', FALSE);
+
+/**
+* Some ASCII character ordinals.
+* N.B. : PHP identifiers are case-insensitive !
+*/
+
+define('ORD_NL', ord("\n"));
+define('ORD_space', ord(' '));
+define('ORD_cA', ord('A'));
+define('ORD_cZ', ord('Z'));
+define('ORD_a', ord('a'));
+define('ORD_z', ord('z'));
+define('ORD_0', ord('0'));
+define('ORD_9', ord('9'));
+
+/**
+* Generic exception class related to JSMin.
+*/
+
+class JSMinException extends Exception {
+}
+
+/**
+* A JSMin exception indicating that a file provided for input or output could not be properly opened.
+*/
+
+class FileOpenFailedJSMinException extends JSMinException {
+}
+
+/**
+* A JSMin exception indicating that an unterminated comment was encountered in input.
+*/
+
+class UnterminatedCommentJSMinException extends JSMinException {
+}
+
+/**
+* A JSMin exception indicatig that an unterminated string literal was encountered in input.
+*/
+
+class UnterminatedStringLiteralJSMinException extends JSMinException {
+}
+
+/**
+* A JSMin exception indicatig that an unterminated regular expression lieteral was encountered in input.
+*/
+
+class UnterminatedRegExpLiteralJSMinException extends JSMinException {
+}
+
+/**
+* Main JSMin application class.
+*
+* Example of use :
+*
+* $jsMin = new JSMin(...input..., ...output...);
+* $jsMin -> minify();
+*
+* Do not specify input and/or output (or default to '-') to use stdin and/or stdout.
+*/
+
+class JSMin {
+
+ /**
+ * Constant describing an {@link action()} : Output A. Copy B to A. Get the next B.
+ */
+
+ const ACT_FULL = 1;
+
+ /**
+ * Constant describing an {@link action()} : Copy B to A. Get the next B. (Delete A).
+ */
+
+ const ACT_BUF = 2;
+
+ /**
+ * Constant describing an {@link action()} : Get the next B. (Delete B).
+ */
+
+ const ACT_IMM = 3;
+
+ /**
+ * The input stream, from which to read a JS file to minimize. Obtained by fopen().
+ * @var SplFileObject
+ */
+
+ private $in;
+
+ /**
+ * The output stream, in which to write the minimized JS file. Obtained by fopen().
+ * @var SplFileObject
+ */
+
+ private $out;
+
+ /**
+ * Temporary I/O character (A).
+ * @var string
+ */
+
+ private $theA;
+
+ /**
+ * Temporary I/O character (B).
+ * @var string
+ */
+
+ private $theB;
+
+ /**
+ * Indicates whether a character is alphanumeric or _, $, \ or non-ASCII.
+ *
+ * @param string $c The single character to test.
+ * @return boolean Whether the char is a letter, digit, underscore, dollar, backslash, or non-ASCII.
+ */
+
+ private static function isAlphaNum($c) {
+
+ // Get ASCII value of character for C-like comparisons
+
+ $a = ord($c);
+
+ // Compare using defined character ordinals, or between PHP strings
+ // Note : === is micro-faster than == when types are known to be the same
+
+ return
+ ($a >= ORD_a && $a <= ORD_z) ||
+ ($a >= ORD_0 && $a <= ORD_9) ||
+ ($a >= ORD_cA && $a <= ORD_cZ) ||
+ $c === '_' || $c === '$' || $c === '\\' || $a > 126
+ ;
+ }
+
+ /**
+ * Get the next character from the input stream.
+ *
+ * If said character is a control character, translate it to a space or linefeed.
+ *
+ * @return string The next character from the specified input stream.
+ * @see $in
+ * @see peek()
+ */
+
+ private function get() {
+
+ // Get next input character and advance position in file
+
+ $c = $this -> in -> fgetc();
+
+ // Test for non-problematic characters
+
+ if ($c === "\n" || $c === EOF || ord($c) >= ORD_space) {
+ return $c;
+ }
+
+ // else
+ // Make linefeeds into newlines
+
+ if ($c === "\r") {
+ return "\n";
+ }
+
+ // else
+ // Consider space
+
+ return ' ';
+ }
+
+ /**
+ * Get the next character from the input stream, without gettng it.
+ *
+ * @return string The next character from the specified input stream, without advancing the position
+ * in the underlying file.
+ * @see $in
+ * @see get()
+ */
+
+ private function peek() {
+
+ // Get next input character
+
+ $c = $this -> in -> fgetc();
+
+ // Regress position in file
+
+ $this -> in -> fseek(-1, SEEK_CUR);
+
+ // Return character obtained
+
+ return $c;
+ }
+
+ /**
+ * Get the next character from the input stream, excluding comments.
+ *
+ * {@link peek()} is used to see if a '/' is followed by a '*' or '/'.
+ * Multiline comments are actually returned as a single space.
+ *
+ * @return string The next character from the specified input stream, skipping comments.
+ * @see $in
+ */
+
+ private function next() {
+
+ // Get next char from input, translated if necessary
+
+ $c = $this -> get();
+
+ // Check comment possibility
+
+ if ($c == '/') {
+
+ // Look ahead : a comment is two slashes or slashes followed by asterisk (to be closed)
+
+ switch ($this -> peek()) {
+
+ case '/' :
+
+ // Comment is up to the end of the line
+ // TOTEST : simple $this -> in -> fgets()
+
+ while (true) {
+
+ $c = $this -> get();
+
+ if (ord($c) <= ORD_NL) {
+ return $c;
+ }
+ }
+
+ case '*' :
+
+ // Comment is up to comment close.
+ // Might not be terminated, if we hit the end of file.
+
+ while (true) {
+
+ // N.B. not using switch() because of having to test EOF with ===
+
+ $c = $this -> get();
+
+ if ($c == '*') {
+
+ // Comment termination if the char ahead is a slash
+
+ if ($this -> peek() == '/') {
+
+ // Advance again and make into a single space
+
+ $this -> get();
+ return ' ';
+ }
+ }
+ else if ($c === EOF) {
+
+ // Whoopsie
+
+ throw new UnterminatedCommentJSMinException();
+ }
+ }
+
+ default :
+
+ // Not a comment after all
+
+ return $c;
+ }
+ }
+
+ // No risk of a comment
+
+ return $c;
+ }
+
+ /**
+ * Do something !
+ *
+ * The action to perform is determined by the argument :
+ *
+ * JSMin :: ACT_FULL : Output A. Copy B to A. Get the next B.
+ * JSMin :: ACT_BUF : Copy B to A. Get the next B. (Delete A).
+ * JSMin :: ACT_IMM : Get the next B. (Delete B).
+ *
+ * A string is treated as a single character. Also, regular expressions are recognized if preceded
+ * by '(', ',' or '='.
+ *
+ * @param int $action The action to perform : one of the JSMin :: ACT_* constants.
+ */
+
+ private function action($action) {
+
+ // Choice of possible actions
+ // Note the frequent fallthroughs : the actions are decrementally "long"
+
+ switch ($action) {
+
+ case self :: ACT_FULL :
+
+ // Write A to output, then fall through
+
+ $this -> out -> fwrite($this -> theA);
+
+ case self :: ACT_BUF : // N.B. possible fallthrough from above
+
+ // Copy B to A
+
+ $tmpA = $this -> theA = $this -> theB;
+
+ // Treating a string as a single char : outputting it whole
+ // Note that the string-opening char (" or ') is memorized in B
+
+ if ($tmpA == '\'' || $tmpA == '"') {
+
+ while (true) {
+
+ // Output string contents
+
+ $this -> out -> fwrite($tmpA);
+
+ // Get next character, watching out for termination of the current string,
+ // new line & co (then the string is not terminated !), or a backslash
+ // (upon which the following char is directly output to serve the escape mechanism)
+
+ $tmpA = $this -> theA = $this -> get();
+
+ if ($tmpA == $this -> theB) {
+
+ // String terminated
+
+ break; // from while(true)
+ }
+
+ // else
+
+ if (ord($tmpA) <= ORD_NL) {
+
+ // Whoopsie
+
+ throw new UnterminatedStringLiteralJSMinException();
+ }
+
+ // else
+
+ if ($tmpA == '\\') {
+
+ // Escape next char immediately
+
+ $this -> out -> fwrite($tmpA);
+ $tmpA = $this -> theA = $this -> get();
+ }
+ }
+ }
+
+ case self :: ACT_IMM : // N.B. possible fallthrough from above
+
+ // Get the next B
+
+ $this -> theB = $this -> next();
+
+ // Special case of recognising regular expressions (beginning with /) that are
+ // preceded by '(', ',' or '='
+
+ $tmpA = $this -> theA;
+
+ if ($this -> theB == '/' && ($tmpA == '(' || $tmpA == ',' || $tmpA == '=')) {
+
+ // Output the two successive chars
+
+ $this -> out -> fwrite($tmpA);
+ $this -> out -> fwrite($this -> theB);
+
+ // Look for the end of the RE literal, watching out for escaped chars or a control /
+ // end of line char (the RE literal then being unterminated !)
+
+ while (true) {
+
+ $tmpA = $this -> theA = $this -> get();
+
+ if ($tmpA == '/') {
+
+ // RE literal terminated
+
+ break; // from while(true)
+ }
+
+ // else
+
+ if ($tmpA == '\\') {
+
+ // Escape next char immediately
+
+ $this -> out -> fwrite($tmpA);
+ $tmpA = $this -> theA = $this -> get();
+ }
+ else if (ord($tmpA) <= ORD_NL) {
+
+ // Whoopsie
+
+ throw new UnterminatedRegExpLiteralJSMinException();
+ }
+
+ // Output RE characters
+
+ $this -> out -> fwrite($tmpA);
+ }
+
+ // Move forward after the RE literal
+
+ $this -> theB = $this -> next();
+ }
+
+ break;
+ default : throw new JSMinException('Expected a JSMin :: ACT_* constant in action().');
+ }
+ }
+
+ /**
+ * Run the JSMin application : minify some JS code.
+ *
+ * The code is read from the input stream, and its minified version is written to the output one.
+ * That is : characters which are insignificant to JavaScript are removed, as well as comments ;
+ * tabs are replaced with spaces ; carriage returns are replaced with linefeeds, and finally most
+ * spaces and linefeeds are deleted.
+ *
+ * Note : name was changed from jsmin() because PHP identifiers are case-insensitive, and it is already
+ * the name of this class.
+ *
+ * @see __construct()
+ */
+
+ public function minify() {
+
+ // Initialize A and run the first (minimal) action
+
+ $this -> theA = "\n";
+ $this -> action(self :: ACT_IMM);
+
+ // Proceed all the way to the end of the input file
+
+ while ($this -> theA !== EOF) {
+
+ switch ($this -> theA) {
+
+ case ' ' :
+
+ if (self :: isAlphaNum($this -> theB)) {
+ $this -> action(self :: ACT_FULL);
+ }
+ else {
+ $this -> action(self :: ACT_BUF);
+ }
+
+ break;
+ case "\n" :
+
+ switch ($this -> theB) {
+
+ case '{' : case '[' : case '(' :
+ case '+' : case '-' :
+
+ $this -> action(self :: ACT_FULL);
+
+ break;
+ case ' ' :
+
+ $this -> action(self :: ACT_IMM);
+
+ break;
+ default :
+
+ if (self :: isAlphaNum($this -> theB)) {
+ $this -> action(self :: ACT_FULL);
+ }
+ else {
+ $this -> action(self :: ACT_BUF);
+ }
+
+ break;
+ }
+
+ break;
+ default :
+
+ switch ($this -> theB) {
+
+ case ' ' :
+
+ if (self :: isAlphaNum($this -> theA)) {
+
+ $this -> action(self :: ACT_FULL);
+ break;
+ }
+
+ // else
+
+ $this -> action(self :: ACT_IMM);
+
+ break;
+ case "\n" :
+
+ switch ($this -> theA) {
+
+ case '}' : case ']' : case ')' : case '+' :
+ case '-' : case '"' : case '\'' :
+
+ $this -> action(self :: ACT_FULL);
+
+ break;
+ default :
+
+ if (self :: isAlphaNum($this -> theA)) {
+ $this -> action(self :: ACT_FULL);
+ }
+ else {
+ $this -> action(self :: ACT_IMM);
+ }
+
+ break;
+ }
+
+ break;
+ default :
+
+ $this -> action(self :: ACT_FULL);
+
+ break;
+ }
+
+ break;
+ }
+ }
+ }
+
+ /**
+ * Prepare a new JSMin application.
+ *
+ * The next step is to {@link minify()} the input into the output.
+ *
+ * @param string $inFileName The pathname of the input (unminified JS) file. STDIN if '-' or absent.
+ * @param string $outFileName The pathname of the output (minified JS) file. STDOUT if '-' or absent.
+ * @param array $comments Optional lines to present as comments at the beginning of the output.
+ * @throws FileOpenFailedJSMinException If the input and/or output file pathname is not provided, and
+ * respectively STDIN and/or STDOUT are not available (ie, script is not being used in CLI).
+ */
+
+ public function __construct($inFileName = '-', $outFileName = '-', $comments = NULL) {
+
+ // Recuperate input and output streams.
+ // Use STDIN and STDOUT by default, if they are defined (CLI mode) and no file names are provided
+
+ if ($inFileName == '-') $inFileName = 'php://stdin';
+ if ($outFileName == '-') $outFileName = 'php://stdout';
+
+ try {
+
+ $this -> in = new SplFileObject($inFileName, 'rb', TRUE);
+ }
+ catch (Exception $e) {
+
+ throw new FileOpenFailedJSMinException(
+ 'Failed to open "'.$inFileName.'" for reading only.'
+ );
+ }
+
+ try {
+
+ $this -> out = new SplFileObject($outFileName, 'wb', TRUE);
+ }
+ catch (Exception $e) {
+
+ throw new FileOpenFailedJSMinException(
+ 'Failed to open "'.$outFileName.'" for writing only.'
+ );
+ }
+
+ // Present possible initial comments
+
+ if ($comments !== NULL) {
+ foreach ($comments as $comm) {
+ $this -> out -> fwrite('// '.$comm."\n");
+ }
+ }
+ }
+}
+
+?>
\ No newline at end of file |