diff options
Diffstat (limited to 'infrastructure/yuicompressor/src/com/yahoo/platform/yui')
8 files changed, 2159 insertions, 0 deletions
diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/Bootstrap.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/Bootstrap.java new file mode 100644 index 0000000..1b95aca --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/Bootstrap.java @@ -0,0 +1,22 @@ +/*
+ * YUI Compressor
+ * Author: Julien Lecomte <jlecomte@yahoo-inc.com>
+ * Copyright (c) 2007, Yahoo! Inc. All rights reserved.
+ * Code licensed under the BSD License:
+ * http://developer.yahoo.net/yui/license.txt
+ */
+
+package com.yahoo.platform.yui.compressor;
+
+import java.lang.reflect.Method;
+
+public class Bootstrap {
+
+ public static void main(String args[]) throws Exception {
+ ClassLoader loader = new JarClassLoader();
+ Thread.currentThread().setContextClassLoader(loader);
+ Class c = loader.loadClass(YUICompressor.class.getName());
+ Method main = c.getMethod("main", new Class[]{String[].class});
+ main.invoke(null, new Object[]{args});
+ }
+}
\ No newline at end of file diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/CssCompressor.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/CssCompressor.java new file mode 100644 index 0000000..68b4de9 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/CssCompressor.java @@ -0,0 +1,188 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + * + * This code is a port of Isaac Schlueter's cssmin utility. + */ + +package com.yahoo.platform.yui.compressor; + +import java.io.IOException; +import java.io.Reader; +import java.io.Writer; +import java.util.regex.Pattern; +import java.util.regex.Matcher; + +public class CssCompressor { + + private StringBuffer srcsb = new StringBuffer(); + + public CssCompressor(Reader in) throws IOException { + // Read the stream... + int c; + while ((c = in.read()) != -1) { + srcsb.append((char) c); + } + } + + public void compress(Writer out, int linebreakpos) + throws IOException { + + Pattern p; + Matcher m; + String css; + StringBuffer sb; + int startIndex, endIndex; + + // Remove all comment blocks... + startIndex = 0; + boolean iemac = false; + boolean preserve = false; + sb = new StringBuffer(srcsb.toString()); + while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) { + preserve = sb.length() > startIndex + 2 && sb.charAt(startIndex + 2) == '!'; + endIndex = sb.indexOf("*/", startIndex + 2); + if (endIndex < 0) { + if (!preserve) { + sb.delete(startIndex, sb.length()); + } + } else if (endIndex >= startIndex + 2) { + if (sb.charAt(endIndex-1) == '\\') { + // Looks like a comment to hide rules from IE Mac. + // Leave this comment, and the following one, alone... + startIndex = endIndex + 2; + iemac = true; + } else if (iemac) { + startIndex = endIndex + 2; + iemac = false; + } else if (!preserve) { + sb.delete(startIndex, endIndex + 2); + } else { + startIndex = endIndex + 2; + } + } + } + + css = sb.toString(); + + // Normalize all whitespace strings to single spaces. Easier to work with that way. + css = css.replaceAll("\\s+", " "); + + // Make a pseudo class for the Box Model Hack + css = css.replaceAll("\"\\\\\"}\\\\\"\"", "___PSEUDOCLASSBMH___"); + + // Remove the spaces before the things that should not have spaces before them. + // But, be careful not to turn "p :link {...}" into "p:link{...}" + // Swap out any pseudo-class colons with the token, and then swap back. + sb = new StringBuffer(); + p = Pattern.compile("(^|\\})(([^\\{:])+:)+([^\\{]*\\{)"); + m = p.matcher(css); + while (m.find()) { + String s = m.group(); + s = s.replaceAll(":", "___PSEUDOCLASSCOLON___"); + m.appendReplacement(sb, s); + } + m.appendTail(sb); + css = sb.toString(); + css = css.replaceAll("\\s+([!{};:>+\\(\\)\\],])", "$1"); + css = css.replaceAll("___PSEUDOCLASSCOLON___", ":"); + + // Remove the spaces after the things that should not have spaces after them. + css = css.replaceAll("([!{}:;>+\\(\\[,])\\s+", "$1"); + + // Add the semicolon where it's missing. + css = css.replaceAll("([^;\\}])}", "$1;}"); + + // Replace 0(px,em,%) with 0. + css = css.replaceAll("([\\s:])(0)(px|em|%|in|cm|mm|pc|pt|ex)", "$1$2"); + + // Replace 0 0 0 0; with 0. + css = css.replaceAll(":0 0 0 0;", ":0;"); + css = css.replaceAll(":0 0 0;", ":0;"); + css = css.replaceAll(":0 0;", ":0;"); + // Replace background-position:0; with background-position:0 0; + css = css.replaceAll("background-position:0;", "background-position:0 0;"); + + // Replace 0.6 to .6, but only when preceded by : or a white-space + css = css.replaceAll("(:|\\s)0+\\.(\\d+)", "$1.$2"); + + // Shorten colors from rgb(51,102,153) to #336699 + // This makes it more likely that it'll get further compressed in the next step. + p = Pattern.compile("rgb\\s*\\(\\s*([0-9,\\s]+)\\s*\\)"); + m = p.matcher(css); + sb = new StringBuffer(); + while (m.find()) { + String[] rgbcolors = m.group(1).split(","); + StringBuffer hexcolor = new StringBuffer("#"); + for (int i = 0; i < rgbcolors.length; i++) { + int val = Integer.parseInt(rgbcolors[i]); + if (val < 16) { + hexcolor.append("0"); + } + hexcolor.append(Integer.toHexString(val)); + } + m.appendReplacement(sb, hexcolor.toString()); + } + m.appendTail(sb); + css = sb.toString(); + + // Shorten colors from #AABBCC to #ABC. Note that we want to make sure + // the color is not preceded by either ", " or =. Indeed, the property + // filter: chroma(color="#FFFFFF"); + // would become + // filter: chroma(color="#FFF"); + // which makes the filter break in IE. + p = Pattern.compile("([^\"'=\\s])(\\s*)#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])"); + m = p.matcher(css); + sb = new StringBuffer(); + while (m.find()) { + // Test for AABBCC pattern + if (m.group(3).equalsIgnoreCase(m.group(4)) && + m.group(5).equalsIgnoreCase(m.group(6)) && + m.group(7).equalsIgnoreCase(m.group(8))) { + m.appendReplacement(sb, m.group(1) + m.group(2) + "#" + m.group(3) + m.group(5) + m.group(7)); + } else { + m.appendReplacement(sb, m.group()); + } + } + m.appendTail(sb); + css = sb.toString(); + + // Remove empty rules. + css = css.replaceAll("[^\\}]+\\{;\\}", ""); + + if (linebreakpos >= 0) { + // Some source control tools don't like it when files containing lines longer + // than, say 8000 characters, are checked in. The linebreak option is used in + // that case to split long lines after a specific column. + int i = 0; + int linestartpos = 0; + sb = new StringBuffer(css); + while (i < sb.length()) { + char c = sb.charAt(i++); + if (c == '}' && i - linestartpos > linebreakpos) { + sb.insert(i, '\n'); + linestartpos = i; + } + } + + css = sb.toString(); + } + + // Replace the pseudo class for the Box Model Hack + css = css.replaceAll("___PSEUDOCLASSBMH___", "\"\\\\\"}\\\\\"\""); + + // Replace multiple semi-colons in a row by a single one + // See SF bug #1980989 + css = css.replaceAll(";;+", ";"); + + // Trim the final string (for any leading or trailing white spaces) + css = css.trim(); + + // Write the output... + out.write(css); + } +} diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JarClassLoader.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JarClassLoader.java new file mode 100644 index 0000000..a6d3e13 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JarClassLoader.java @@ -0,0 +1,158 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; +import java.util.Enumeration; +import java.util.jar.JarEntry; +import java.util.jar.JarFile; + +public class JarClassLoader extends ClassLoader { + + private static String jarPath; + + public Class loadClass(String name) throws ClassNotFoundException { + + // First check if the class is already loaded + Class c = findLoadedClass(name); + if (c == null) { + c = findClass(name); + } + + if (c == null) { + c = ClassLoader.getSystemClassLoader().loadClass(name); + } + + return c; + } + + private static String getJarPath() { + + if (jarPath != null) { + return jarPath; + } + + String classname = JarClassLoader.class.getName().replace('.', '/') + ".class"; + String classpath = System.getProperty("java.class.path"); + String classpaths[] = classpath.split(System.getProperty("path.separator")); + + for (int i = 0; i < classpaths.length; i++) { + + String path = classpaths[i]; + JarFile jarFile = null; + JarEntry jarEntry = null; + + try { + jarFile = new JarFile(path); + jarEntry = findJarEntry(jarFile, classname); + } catch (IOException ioe) { + /* ignore */ + } finally { + if (jarFile != null) { + try { + jarFile.close(); + } catch (IOException ioe) { + /* ignore */ + } + } + } + + if (jarEntry != null) { + jarPath = path; + break; + } + } + + return jarPath; + } + + private static JarEntry findJarEntry(JarFile jarFile, String entryName) { + + Enumeration entries = jarFile.entries(); + + while (entries.hasMoreElements()) { + JarEntry entry = (JarEntry) entries.nextElement(); + if (entry.getName().equals(entryName)) { + return entry; + } + } + + return null; + } + + protected Class findClass(String name) { + + Class c = null; + String jarPath = getJarPath(); + + if (jarPath != null) { + JarFile jarFile = null; + try { + jarFile = new JarFile(jarPath); + c = loadClassData(jarFile, name); + } catch (IOException ioe) { + /* ignore */ + } finally { + if (jarFile != null) { + try { + jarFile.close(); + } catch (IOException ioe) { + /* ignore */ + } + } + } + } + + return c; + } + + private Class loadClassData(JarFile jarFile, String className) { + + String entryName = className.replace('.', '/') + ".class"; + JarEntry jarEntry = findJarEntry(jarFile, entryName); + if (jarEntry == null) { + return null; + } + + // Create the necessary package if needed... + int index = className.lastIndexOf('.'); + if (index >= 0) { + String packageName = className.substring(0, index); + if (getPackage(packageName) == null) { + definePackage(packageName, "", "", "", "", "", "", null); + } + } + + // Read the Jar File entry and define the class... + Class c = null; + try { + InputStream is = jarFile.getInputStream(jarEntry); + ByteArrayOutputStream os = new ByteArrayOutputStream(); + copy(is, os); + byte[] bytes = os.toByteArray(); + c = defineClass(className, bytes, 0, bytes.length); + } catch (IOException ioe) { + /* ignore */ + } + + return c; + } + + private void copy(InputStream in, OutputStream out) throws IOException { + byte[] buf = new byte[1024]; + while (true) { + int len = in.read(buf); + if (len < 0) break; + out.write(buf, 0, len); + } + } +}
\ No newline at end of file diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptCompressor.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptCompressor.java new file mode 100644 index 0000000..e69ae1a --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptCompressor.java @@ -0,0 +1,1307 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +import yuicompressor.org.mozilla.javascript.*; + +import java.io.IOException; +import java.io.Reader; +import java.io.Writer; +import java.util.*; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +public class JavaScriptCompressor { + + static final ArrayList ones; + static final ArrayList twos; + static final ArrayList threes; + + static final Set builtin = new HashSet(); + static final Map literals = new Hashtable(); + static final Set reserved = new HashSet(); + + static { + + // This list contains all the 3 characters or less built-in global + // symbols available in a browser. Please add to this list if you + // see anything missing. + builtin.add("NaN"); + builtin.add("top"); + + ones = new ArrayList(); + for (char c = 'A'; c <= 'Z'; c++) + ones.add(Character.toString(c)); + for (char c = 'a'; c <= 'z'; c++) + ones.add(Character.toString(c)); + + twos = new ArrayList(); + for (int i = 0; i < ones.size(); i++) { + String one = (String) ones.get(i); + for (char c = 'A'; c <= 'Z'; c++) + twos.add(one + Character.toString(c)); + for (char c = 'a'; c <= 'z'; c++) + twos.add(one + Character.toString(c)); + for (char c = '0'; c <= '9'; c++) + twos.add(one + Character.toString(c)); + } + + // Remove two-letter JavaScript reserved words and built-in globals... + twos.remove("as"); + twos.remove("is"); + twos.remove("do"); + twos.remove("if"); + twos.remove("in"); + twos.removeAll(builtin); + + threes = new ArrayList(); + for (int i = 0; i < twos.size(); i++) { + String two = (String) twos.get(i); + for (char c = 'A'; c <= 'Z'; c++) + threes.add(two + Character.toString(c)); + for (char c = 'a'; c <= 'z'; c++) + threes.add(two + Character.toString(c)); + for (char c = '0'; c <= '9'; c++) + threes.add(two + Character.toString(c)); + } + + // Remove three-letter JavaScript reserved words and built-in globals... + threes.remove("for"); + threes.remove("int"); + threes.remove("new"); + threes.remove("try"); + threes.remove("use"); + threes.remove("var"); + threes.removeAll(builtin); + + // That's up to ((26+26)*(1+(26+26+10)))*(1+(26+26+10))-8 + // (206,380 symbols per scope) + + // The following list comes from org/mozilla/javascript/Decompiler.java... + literals.put(new Integer(Token.GET), "get "); + literals.put(new Integer(Token.SET), "set "); + literals.put(new Integer(Token.TRUE), "true"); + literals.put(new Integer(Token.FALSE), "false"); + literals.put(new Integer(Token.NULL), "null"); + literals.put(new Integer(Token.THIS), "this"); + literals.put(new Integer(Token.FUNCTION), "function"); + literals.put(new Integer(Token.COMMA), ","); + literals.put(new Integer(Token.LC), "{"); + literals.put(new Integer(Token.RC), "}"); + literals.put(new Integer(Token.LP), "("); + literals.put(new Integer(Token.RP), ")"); + literals.put(new Integer(Token.LB), "["); + literals.put(new Integer(Token.RB), "]"); + literals.put(new Integer(Token.DOT), "."); + literals.put(new Integer(Token.NEW), "new "); + literals.put(new Integer(Token.DELPROP), "delete "); + literals.put(new Integer(Token.IF), "if"); + literals.put(new Integer(Token.ELSE), "else"); + literals.put(new Integer(Token.FOR), "for"); + literals.put(new Integer(Token.IN), " in "); + literals.put(new Integer(Token.WITH), "with"); + literals.put(new Integer(Token.WHILE), "while"); + literals.put(new Integer(Token.DO), "do"); + literals.put(new Integer(Token.TRY), "try"); + literals.put(new Integer(Token.CATCH), "catch"); + literals.put(new Integer(Token.FINALLY), "finally"); + literals.put(new Integer(Token.THROW), "throw"); + literals.put(new Integer(Token.SWITCH), "switch"); + literals.put(new Integer(Token.BREAK), "break"); + literals.put(new Integer(Token.CONTINUE), "continue"); + literals.put(new Integer(Token.CASE), "case"); + literals.put(new Integer(Token.DEFAULT), "default"); + literals.put(new Integer(Token.RETURN), "return"); + literals.put(new Integer(Token.VAR), "var "); + literals.put(new Integer(Token.SEMI), ";"); + literals.put(new Integer(Token.ASSIGN), "="); + literals.put(new Integer(Token.ASSIGN_ADD), "+="); + literals.put(new Integer(Token.ASSIGN_SUB), "-="); + literals.put(new Integer(Token.ASSIGN_MUL), "*="); + literals.put(new Integer(Token.ASSIGN_DIV), "/="); + literals.put(new Integer(Token.ASSIGN_MOD), "%="); + literals.put(new Integer(Token.ASSIGN_BITOR), "|="); + literals.put(new Integer(Token.ASSIGN_BITXOR), "^="); + literals.put(new Integer(Token.ASSIGN_BITAND), "&="); + literals.put(new Integer(Token.ASSIGN_LSH), "<<="); + literals.put(new Integer(Token.ASSIGN_RSH), ">>="); + literals.put(new Integer(Token.ASSIGN_URSH), ">>>="); + literals.put(new Integer(Token.HOOK), "?"); + literals.put(new Integer(Token.OBJECTLIT), ":"); + literals.put(new Integer(Token.COLON), ":"); + literals.put(new Integer(Token.OR), "||"); + literals.put(new Integer(Token.AND), "&&"); + literals.put(new Integer(Token.BITOR), "|"); + literals.put(new Integer(Token.BITXOR), "^"); + literals.put(new Integer(Token.BITAND), "&"); + literals.put(new Integer(Token.SHEQ), "==="); + literals.put(new Integer(Token.SHNE), "!=="); + literals.put(new Integer(Token.EQ), "=="); + literals.put(new Integer(Token.NE), "!="); + literals.put(new Integer(Token.LE), "<="); + literals.put(new Integer(Token.LT), "<"); + literals.put(new Integer(Token.GE), ">="); + literals.put(new Integer(Token.GT), ">"); + literals.put(new Integer(Token.INSTANCEOF), " instanceof "); + literals.put(new Integer(Token.LSH), "<<"); + literals.put(new Integer(Token.RSH), ">>"); + literals.put(new Integer(Token.URSH), ">>>"); + literals.put(new Integer(Token.TYPEOF), "typeof"); + literals.put(new Integer(Token.VOID), "void "); + literals.put(new Integer(Token.CONST), "const "); + literals.put(new Integer(Token.NOT), "!"); + literals.put(new Integer(Token.BITNOT), "~"); + literals.put(new Integer(Token.POS), "+"); + literals.put(new Integer(Token.NEG), "-"); + literals.put(new Integer(Token.INC), "++"); + literals.put(new Integer(Token.DEC), "--"); + literals.put(new Integer(Token.ADD), "+"); + literals.put(new Integer(Token.SUB), "-"); + literals.put(new Integer(Token.MUL), "*"); + literals.put(new Integer(Token.DIV), "/"); + literals.put(new Integer(Token.MOD), "%"); + literals.put(new Integer(Token.COLONCOLON), "::"); + literals.put(new Integer(Token.DOTDOT), ".."); + literals.put(new Integer(Token.DOTQUERY), ".("); + literals.put(new Integer(Token.XMLATTR), "@"); + + // See http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Reserved_Words + + // JavaScript 1.5 reserved words + reserved.add("break"); + reserved.add("case"); + reserved.add("catch"); + reserved.add("continue"); + reserved.add("default"); + reserved.add("delete"); + reserved.add("do"); + reserved.add("else"); + reserved.add("finally"); + reserved.add("for"); + reserved.add("function"); + reserved.add("if"); + reserved.add("in"); + reserved.add("instanceof"); + reserved.add("new"); + reserved.add("return"); + reserved.add("switch"); + reserved.add("this"); + reserved.add("throw"); + reserved.add("try"); + reserved.add("typeof"); + reserved.add("var"); + reserved.add("void"); + reserved.add("while"); + reserved.add("with"); + // Words reserved for future use + reserved.add("abstract"); + reserved.add("boolean"); + reserved.add("byte"); + reserved.add("char"); + reserved.add("class"); + reserved.add("const"); + reserved.add("debugger"); + reserved.add("double"); + reserved.add("enum"); + reserved.add("export"); + reserved.add("extends"); + reserved.add("final"); + reserved.add("float"); + reserved.add("goto"); + reserved.add("implements"); + reserved.add("import"); + reserved.add("int"); + reserved.add("interface"); + reserved.add("long"); + reserved.add("native"); + reserved.add("package"); + reserved.add("private"); + reserved.add("protected"); + reserved.add("public"); + reserved.add("short"); + reserved.add("static"); + reserved.add("super"); + reserved.add("synchronized"); + reserved.add("throws"); + reserved.add("transient"); + reserved.add("volatile"); + // These are not reserved, but should be taken into account + // in isValidIdentifier (See jslint source code) + reserved.add("arguments"); + reserved.add("eval"); + reserved.add("true"); + reserved.add("false"); + reserved.add("Infinity"); + reserved.add("NaN"); + reserved.add("null"); + reserved.add("undefined"); + } + + private static int countChar(String haystack, char needle) { + int idx = 0; + int count = 0; + int length = haystack.length(); + while (idx < length) { + char c = haystack.charAt(idx++); + if (c == needle) { + count++; + } + } + return count; + } + + private static int printSourceString(String source, int offset, StringBuffer sb) { + int length = source.charAt(offset); + ++offset; + if ((0x8000 & length) != 0) { + length = ((0x7FFF & length) << 16) | source.charAt(offset); + ++offset; + } + if (sb != null) { + String str = source.substring(offset, offset + length); + sb.append(str); + } + return offset + length; + } + + private static int printSourceNumber(String source, + int offset, StringBuffer sb) { + double number = 0.0; + char type = source.charAt(offset); + ++offset; + if (type == 'S') { + if (sb != null) { + number = source.charAt(offset); + } + ++offset; + } else if (type == 'J' || type == 'D') { + if (sb != null) { + long lbits; + lbits = (long) source.charAt(offset) << 48; + lbits |= (long) source.charAt(offset + 1) << 32; + lbits |= (long) source.charAt(offset + 2) << 16; + lbits |= (long) source.charAt(offset + 3); + if (type == 'J') { + number = lbits; + } else { + number = Double.longBitsToDouble(lbits); + } + } + offset += 4; + } else { + // Bad source + throw new RuntimeException(); + } + if (sb != null) { + sb.append(ScriptRuntime.numberToString(number, 10)); + } + return offset; + } + + private static ArrayList parse(Reader in, ErrorReporter reporter) + throws IOException, EvaluatorException { + + CompilerEnvirons env = new CompilerEnvirons(); + Parser parser = new Parser(env, reporter); + parser.parse(in, null, 1); + String source = parser.getEncodedSource(); + + int offset = 0; + int length = source.length(); + ArrayList tokens = new ArrayList(); + StringBuffer sb = new StringBuffer(); + + while (offset < length) { + int tt = source.charAt(offset++); + switch (tt) { + + case Token.SPECIALCOMMENT: + case Token.NAME: + case Token.REGEXP: + case Token.STRING: + sb.setLength(0); + offset = printSourceString(source, offset, sb); + tokens.add(new JavaScriptToken(tt, sb.toString())); + break; + + case Token.NUMBER: + sb.setLength(0); + offset = printSourceNumber(source, offset, sb); + tokens.add(new JavaScriptToken(tt, sb.toString())); + break; + + default: + String literal = (String) literals.get(new Integer(tt)); + if (literal != null) { + tokens.add(new JavaScriptToken(tt, literal)); + } + break; + } + } + + return tokens; + } + + private static void processStringLiterals(ArrayList tokens, boolean merge) { + + String tv; + int i, length = tokens.size(); + JavaScriptToken token, prevToken, nextToken; + + if (merge) { + + // Concatenate string literals that are being appended wherever + // it is safe to do so. Note that we take care of the case: + // "a" + "b".toUpperCase() + + for (i = 0; i < length; i++) { + token = (JavaScriptToken) tokens.get(i); + switch (token.getType()) { + + case Token.ADD: + if (i > 0 && i < length) { + prevToken = (JavaScriptToken) tokens.get(i - 1); + nextToken = (JavaScriptToken) tokens.get(i + 1); + if (prevToken.getType() == Token.STRING && nextToken.getType() == Token.STRING && + (i == length - 1 || ((JavaScriptToken) tokens.get(i + 2)).getType() != Token.DOT)) { + tokens.set(i - 1, new JavaScriptToken(Token.STRING, + prevToken.getValue() + nextToken.getValue())); + tokens.remove(i + 1); + tokens.remove(i); + i = i - 1; + length = length - 2; + break; + } + } + } + } + + } + + // Second pass... + + for (i = 0; i < length; i++) { + // APPJET modifications in this loop + token = (JavaScriptToken) tokens.get(i); + if (token.getType() == Token.STRING || token.getType() == Token.REGEXP) { + tv = token.getValue(); + if (token.getType() == Token.STRING) { + + // Finally, add the quoting characters and escape the string. We use + // the quoting character that minimizes the amount of escaping to save + // a few additional bytes. + + char quotechar; + int singleQuoteCount = countChar(tv, '\''); + int doubleQuoteCount = countChar(tv, '"'); + if (doubleQuoteCount <= singleQuoteCount) { + quotechar = '"'; + } else { + quotechar = '\''; + } + + tv = quotechar + escapeString(tv, quotechar) + quotechar; + } + + // String concatenation transforms the old script scheme: + // '<scr'+'ipt ...><'+'/script>' + // into the following: + // '<script ...></script>' + // which breaks if this code is embedded inside an HTML document. + // Since this is not the right way to do this, let's fix the code by + // transforming all "</script" into "<\/script" + + // (Anti-malware software can be sensitive to open tags) + tv = tv.replace("<script", "\\x3cscript"); + tv = tv.replace("</script", "\\x3c/script"); + + tokens.set(i, new JavaScriptToken(token.getType(), tv)); + } + } + } + + // Add necessary escaping that was removed in Rhino's tokenizer. + private static String escapeString(String s, char quotechar) { + + assert quotechar == '"' || quotechar == '\''; + + if (s == null) { + return null; + } + + StringBuffer sb = new StringBuffer(); + for (int i = 0, L = s.length(); i < L; i++) { + int c = s.charAt(i); + if (c == quotechar) { + sb.append("\\"); + } + sb.append((char) c); + } + + return sb.toString(); + } + + /* + * Simple check to see whether a string is a valid identifier name. + * If a string matches this pattern, it means it IS a valid + * identifier name. If a string doesn't match it, it does not + * necessarily mean it is not a valid identifier name. + */ + private static final Pattern SIMPLE_IDENTIFIER_NAME_PATTERN = Pattern.compile("^[a-zA-Z_][a-zA-Z0-9_]*$"); + + private static boolean isValidIdentifier(String s) { + Matcher m = SIMPLE_IDENTIFIER_NAME_PATTERN.matcher(s); + return (m.matches() && !reserved.contains(s)); + } + + /* + * Transforms obj["foo"] into obj.foo whenever possible, saving 3 bytes. + */ + private static void optimizeObjectMemberAccess(ArrayList tokens) { + + String tv; + int i, length; + JavaScriptToken token; + + for (i = 0, length = tokens.size(); i < length; i++) { + + if (((JavaScriptToken) tokens.get(i)).getType() == Token.LB && + i > 0 && i < length - 2 && + ((JavaScriptToken) tokens.get(i - 1)).getType() == Token.NAME && + ((JavaScriptToken) tokens.get(i + 1)).getType() == Token.STRING && + ((JavaScriptToken) tokens.get(i + 2)).getType() == Token.RB) { + token = (JavaScriptToken) tokens.get(i + 1); + tv = token.getValue(); + tv = tv.substring(1, tv.length() - 1); + if (isValidIdentifier(tv)) { + tokens.set(i, new JavaScriptToken(Token.DOT, ".")); + tokens.set(i + 1, new JavaScriptToken(Token.NAME, tv)); + tokens.remove(i + 2); + i = i + 2; + length = length - 1; + } + } + } + } + + /* + * Transforms 'foo': ... into foo: ... whenever possible, saving 2 bytes. + */ + private static void optimizeObjLitMemberDecl(ArrayList tokens) { + + String tv; + int i, length; + JavaScriptToken token; + + for (i = 0, length = tokens.size(); i < length; i++) { + if (((JavaScriptToken) tokens.get(i)).getType() == Token.OBJECTLIT && + i > 0 && ((JavaScriptToken) tokens.get(i - 1)).getType() == Token.STRING) { + token = (JavaScriptToken) tokens.get(i - 1); + tv = token.getValue(); + tv = tv.substring(1, tv.length() - 1); + if (isValidIdentifier(tv)) { + tokens.set(i - 1, new JavaScriptToken(Token.NAME, tv)); + } + } + } + } + + private ErrorReporter logger; + + private boolean munge; + private boolean verbose; + + private static final int BUILDING_SYMBOL_TREE = 1; + private static final int CHECKING_SYMBOL_TREE = 2; + + private int mode; + private int offset; + private int braceNesting; + private ArrayList tokens; + private Stack scopes = new Stack(); + private ScriptOrFnScope globalScope = new ScriptOrFnScope(-1, null); + private Hashtable indexedScopes = new Hashtable(); + + public JavaScriptCompressor(Reader in, ErrorReporter reporter) + throws IOException, EvaluatorException { + + this.logger = reporter; + this.tokens = parse(in, reporter); + } + + public void compress(Writer out, int linebreak, boolean munge, boolean verbose, + boolean preserveAllSemiColons, boolean disableOptimizations) + throws IOException { + + this.munge = munge; + this.verbose = verbose; + + processStringLiterals(this.tokens, !disableOptimizations); + + if (!disableOptimizations) { + optimizeObjectMemberAccess(this.tokens); + optimizeObjLitMemberDecl(this.tokens); + } + + buildSymbolTree(); + // DO NOT TOUCH this.tokens BETWEEN THESE TWO PHASES (BECAUSE OF this.indexedScopes) + mungeSymboltree(); + StringBuffer sb = printSymbolTree(linebreak, preserveAllSemiColons); + + out.write(sb.toString()); + } + + private ScriptOrFnScope getCurrentScope() { + return (ScriptOrFnScope) scopes.peek(); + } + + private void enterScope(ScriptOrFnScope scope) { + scopes.push(scope); + } + + private void leaveCurrentScope() { + scopes.pop(); + } + + private JavaScriptToken consumeToken() { + return (JavaScriptToken) tokens.get(offset++); + } + + private JavaScriptToken getToken(int delta) { + return (JavaScriptToken) tokens.get(offset + delta); + } + + /* + * Returns the identifier for the specified symbol defined in + * the specified scope or in any scope above it. Returns null + * if this symbol does not have a corresponding identifier. + */ + private JavaScriptIdentifier getIdentifier(String symbol, ScriptOrFnScope scope) { + JavaScriptIdentifier identifier; + while (scope != null) { + identifier = scope.getIdentifier(symbol); + if (identifier != null) { + return identifier; + } + scope = scope.getParentScope(); + } + return null; + } + + /* + * If either 'eval' or 'with' is used in a local scope, we must make + * sure that all containing local scopes don't get munged. Otherwise, + * the obfuscation would potentially introduce bugs. + */ + private void protectScopeFromObfuscation(ScriptOrFnScope scope) { + assert scope != null; + + if (scope == globalScope) { + // The global scope does not get obfuscated, + // so we don't need to worry about it... + return; + } + + // Find the highest local scope containing the specified scope. + while (scope.getParentScope() != globalScope) { + scope = scope.getParentScope(); + } + + assert scope.getParentScope() == globalScope; + scope.preventMunging(); + } + + private String getDebugString(int max) { + assert max > 0; + StringBuffer result = new StringBuffer(); + int start = Math.max(offset - max, 0); + int end = Math.min(offset + max, tokens.size()); + for (int i = start; i < end; i++) { + JavaScriptToken token = (JavaScriptToken) tokens.get(i); + if (i == offset - 1) { + result.append(" ---> "); + } + result.append(token.getValue()); + if (i == offset - 1) { + result.append(" <--- "); + } + } + return result.toString(); + } + + private void warn(String message, boolean showDebugString) { + if (verbose) { + if (showDebugString) { + message = message + "\n" + getDebugString(10); + } + logger.warning(message, null, -1, null, -1); + } + } + + private void parseFunctionDeclaration() { + + String symbol; + JavaScriptToken token; + ScriptOrFnScope currentScope, fnScope; + JavaScriptIdentifier identifier; + + currentScope = getCurrentScope(); + + token = consumeToken(); + if (token.getType() == Token.NAME) { + if (mode == BUILDING_SYMBOL_TREE) { + // Get the name of the function and declare it in the current scope. + symbol = token.getValue(); + if (currentScope.getIdentifier(symbol) != null) { + warn("The function " + symbol + " has already been declared in the same scope...", true); + } + currentScope.declareIdentifier(symbol); + } + token = consumeToken(); + } + + assert token.getType() == Token.LP; + if (mode == BUILDING_SYMBOL_TREE) { + fnScope = new ScriptOrFnScope(braceNesting, currentScope); + indexedScopes.put(new Integer(offset), fnScope); + } else { + fnScope = (ScriptOrFnScope) indexedScopes.get(new Integer(offset)); + } + + // Parse function arguments. + int argpos = 0; + while ((token = consumeToken()).getType() != Token.RP) { + assert token.getType() == Token.NAME || + token.getType() == Token.COMMA; + if (token.getType() == Token.NAME && mode == BUILDING_SYMBOL_TREE) { + symbol = token.getValue(); + identifier = fnScope.declareIdentifier(symbol); + if (symbol.equals("$super") && argpos == 0) { + // Exception for Prototype 1.6... + identifier.preventMunging(); + } + argpos++; + } + } + + token = consumeToken(); + assert token.getType() == Token.LC; + braceNesting++; + + token = getToken(0); + if (token.getType() == Token.STRING && + getToken(1).getType() == Token.SEMI) { + // This is a hint. Hints are empty statements that look like + // "localvar1:nomunge, localvar2:nomunge"; They allow developers + // to prevent specific symbols from getting obfuscated (some heretic + // implementations, such as Prototype 1.6, require specific variable + // names, such as $super for example, in order to work appropriately. + // Note: right now, only "nomunge" is supported in the right hand side + // of a hint. However, in the future, the right hand side may contain + // other values. + consumeToken(); + String hints = token.getValue(); + // Remove the leading and trailing quotes... + hints = hints.substring(1, hints.length() - 1).trim(); + StringTokenizer st1 = new StringTokenizer(hints, ","); + while (st1.hasMoreTokens()) { + String hint = st1.nextToken(); + int idx = hint.indexOf(':'); + if (idx <= 0 || idx >= hint.length() - 1) { + if (mode == BUILDING_SYMBOL_TREE) { + // No need to report the error twice, hence the test... + warn("Invalid hint syntax: " + hint, true); + } + break; + } + String variableName = hint.substring(0, idx).trim(); + String variableType = hint.substring(idx + 1).trim(); + if (mode == BUILDING_SYMBOL_TREE) { + fnScope.addHint(variableName, variableType); + } else if (mode == CHECKING_SYMBOL_TREE) { + identifier = fnScope.getIdentifier(variableName); + if (identifier != null) { + if (variableType.equals("nomunge")) { + identifier.preventMunging(); + } else { + warn("Unsupported hint value: " + hint, true); + } + } else { + warn("Hint refers to an unknown identifier: " + hint, true); + } + } + } + } + + parseScope(fnScope); + } + + private void parseCatch() { + + String symbol; + JavaScriptToken token; + ScriptOrFnScope currentScope; + JavaScriptIdentifier identifier; + + token = getToken(-1); + assert token.getType() == Token.CATCH; + token = consumeToken(); + assert token.getType() == Token.LP; + token = consumeToken(); + assert token.getType() == Token.NAME; + + symbol = token.getValue(); + currentScope = getCurrentScope(); + + if (mode == BUILDING_SYMBOL_TREE) { + // We must declare the exception identifier in the containing function + // scope to avoid errors related to the obfuscation process. No need to + // display a warning if the symbol was already declared here... + currentScope.declareIdentifier(symbol); + } else { + identifier = getIdentifier(symbol, currentScope); + identifier.incrementRefcount(); + } + + token = consumeToken(); + assert token.getType() == Token.RP; + } + + private void parseExpression() { + + // Parse the expression until we encounter a comma or a semi-colon + // in the same brace nesting, bracket nesting and paren nesting. + // Parse functions if any... + + String symbol; + JavaScriptToken token; + ScriptOrFnScope currentScope; + JavaScriptIdentifier identifier; + + int expressionBraceNesting = braceNesting; + int bracketNesting = 0; + int parensNesting = 0; + + int length = tokens.size(); + + while (offset < length) { + + token = consumeToken(); + currentScope = getCurrentScope(); + + switch (token.getType()) { + + case Token.SEMI: + case Token.COMMA: + if (braceNesting == expressionBraceNesting && + bracketNesting == 0 && + parensNesting == 0) { + return; + } + break; + + case Token.FUNCTION: + parseFunctionDeclaration(); + break; + + case Token.LC: + braceNesting++; + break; + + case Token.RC: + braceNesting--; + assert braceNesting >= expressionBraceNesting; + break; + + case Token.LB: + bracketNesting++; + break; + + case Token.RB: + bracketNesting--; + break; + + case Token.LP: + parensNesting++; + break; + + case Token.RP: + parensNesting--; + break; + + case Token.SPECIALCOMMENT: + if (mode == BUILDING_SYMBOL_TREE) { + protectScopeFromObfuscation(currentScope); + warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression!" : ""), true); + } + break; + + case Token.NAME: + symbol = token.getValue(); + + if (mode == BUILDING_SYMBOL_TREE) { + + if (symbol.equals("eval")) { + + protectScopeFromObfuscation(currentScope); + warn("Using 'eval' is not recommended." + (munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true); + + } + + } else if (mode == CHECKING_SYMBOL_TREE) { + + if ((offset < 2 || + (getToken(-2).getType() != Token.DOT && + getToken(-2).getType() != Token.GET && + getToken(-2).getType() != Token.SET)) && + getToken(0).getType() != Token.OBJECTLIT) { + + identifier = getIdentifier(symbol, currentScope); + + if (identifier == null) { + + if (symbol.length() <= 3 && !builtin.contains(symbol)) { + // Here, we found an undeclared and un-namespaced symbol that is + // 3 characters or less in length. Declare it in the global scope. + // We don't need to declare longer symbols since they won't cause + // any conflict with other munged symbols. + globalScope.declareIdentifier(symbol); + warn("Found an undeclared symbol: " + symbol, true); + } + + } else { + + identifier.incrementRefcount(); + } + } + } + break; + } + } + } + + private void parseScope(ScriptOrFnScope scope) { + + String symbol; + JavaScriptToken token; + JavaScriptIdentifier identifier; + + int length = tokens.size(); + + enterScope(scope); + + while (offset < length) { + + token = consumeToken(); + + switch (token.getType()) { + + case Token.VAR: + + if (mode == BUILDING_SYMBOL_TREE && scope.incrementVarCount() > 1) { + warn("Try to use a single 'var' statement per scope.", true); + } + + /* FALLSTHROUGH */ + + case Token.CONST: + + // The var keyword is followed by at least one symbol name. + // If several symbols follow, they are comma separated. + for (; ;) { + token = consumeToken(); + + assert token.getType() == Token.NAME; + + if (mode == BUILDING_SYMBOL_TREE) { + symbol = token.getValue(); + if (scope.getIdentifier(symbol) == null) { + scope.declareIdentifier(symbol); + } else { + warn("The variable " + symbol + " has already been declared in the same scope...", true); + } + } + + token = getToken(0); + + assert token.getType() == Token.SEMI || + token.getType() == Token.ASSIGN || + token.getType() == Token.COMMA || + token.getType() == Token.IN; + + if (token.getType() == Token.IN) { + break; + } else { + parseExpression(); + token = getToken(-1); + if (token.getType() == Token.SEMI) { + break; + } + } + } + break; + + case Token.FUNCTION: + parseFunctionDeclaration(); + break; + + case Token.LC: + braceNesting++; + break; + + case Token.RC: + braceNesting--; + assert braceNesting >= scope.getBraceNesting(); + if (braceNesting == scope.getBraceNesting()) { + leaveCurrentScope(); + return; + } + break; + + case Token.WITH: + if (mode == BUILDING_SYMBOL_TREE) { + // Inside a 'with' block, it is impossible to figure out + // statically whether a symbol is a local variable or an + // object member. As a consequence, the only thing we can + // do is turn the obfuscation off for the highest scope + // containing the 'with' block. + protectScopeFromObfuscation(scope); + warn("Using 'with' is not recommended." + (munge ? " Moreover, using 'with' reduces the level of compression!" : ""), true); + } + break; + + case Token.CATCH: + parseCatch(); + break; + + case Token.SPECIALCOMMENT: + if (mode == BUILDING_SYMBOL_TREE) { + protectScopeFromObfuscation(scope); + warn("Using JScript conditional comments is not recommended." + (munge ? " Moreover, using JScript conditional comments reduces the level of compression." : ""), true); + } + break; + + case Token.NAME: + symbol = token.getValue(); + + if (mode == BUILDING_SYMBOL_TREE) { + + if (symbol.equals("eval")) { + + protectScopeFromObfuscation(scope); + warn("Using 'eval' is not recommended." + (munge ? " Moreover, using 'eval' reduces the level of compression!" : ""), true); + + } + + } else if (mode == CHECKING_SYMBOL_TREE) { + + if ((offset < 2 || getToken(-2).getType() != Token.DOT) && + getToken(0).getType() != Token.OBJECTLIT) { + + identifier = getIdentifier(symbol, scope); + + if (identifier == null) { + + if (symbol.length() <= 3 && !builtin.contains(symbol)) { + // Here, we found an undeclared and un-namespaced symbol that is + // 3 characters or less in length. Declare it in the global scope. + // We don't need to declare longer symbols since they won't cause + // any conflict with other munged symbols. + globalScope.declareIdentifier(symbol); + warn("Found an undeclared symbol: " + symbol, true); + } + + } else { + + identifier.incrementRefcount(); + } + } + } + break; + } + } + } + + private void buildSymbolTree() { + offset = 0; + braceNesting = 0; + scopes.clear(); + indexedScopes.clear(); + indexedScopes.put(new Integer(0), globalScope); + mode = BUILDING_SYMBOL_TREE; + parseScope(globalScope); + } + + private void mungeSymboltree() { + + if (!munge) { + return; + } + + // One problem with obfuscation resides in the use of undeclared + // and un-namespaced global symbols that are 3 characters or less + // in length. Here is an example: + // + // var declaredGlobalVar; + // + // function declaredGlobalFn() { + // var localvar; + // localvar = abc; // abc is an undeclared global symbol + // } + // + // In the example above, there is a slim chance that localvar may be + // munged to 'abc', conflicting with the undeclared global symbol + // abc, creating a potential bug. The following code detects such + // global symbols. This must be done AFTER the entire file has been + // parsed, and BEFORE munging the symbol tree. Note that declaring + // extra symbols in the global scope won't hurt. + // + // Note: Since we go through all the tokens to do this, we also use + // the opportunity to count how many times each identifier is used. + + offset = 0; + braceNesting = 0; + scopes.clear(); + mode = CHECKING_SYMBOL_TREE; + parseScope(globalScope); + globalScope.munge(); + } + + private StringBuffer printSymbolTree(int linebreakpos, boolean preserveAllSemiColons) + throws IOException { + + offset = 0; + braceNesting = 0; + scopes.clear(); + + String symbol; + JavaScriptToken token; + ScriptOrFnScope currentScope; + JavaScriptIdentifier identifier; + + int length = tokens.size(); + StringBuffer result = new StringBuffer(); + + int linestartpos = 0; + + enterScope(globalScope); + + while (offset < length) { + + token = consumeToken(); + symbol = token.getValue(); + currentScope = getCurrentScope(); + + switch (token.getType()) { + + case Token.NAME: + + if (offset >= 2 && getToken(-2).getType() == Token.DOT || + getToken(0).getType() == Token.OBJECTLIT) { + + result.append(symbol); + + } else { + + identifier = getIdentifier(symbol, currentScope); + if (identifier != null) { + if (identifier.getMungedValue() != null) { + result.append(identifier.getMungedValue()); + } else { + result.append(symbol); + } + if (currentScope != globalScope && identifier.getRefcount() == 0) { + warn("The symbol " + symbol + " is declared but is apparently never used.\nThis code can probably be written in a more compact way.", true); + } + } else { + result.append(symbol); + } + } + break; + + case Token.REGEXP: + case Token.NUMBER: + case Token.STRING: + result.append(symbol); + break; + + case Token.ADD: + case Token.SUB: + result.append((String) literals.get(new Integer(token.getType()))); + if (offset < length) { + token = getToken(0); + if (token.getType() == Token.INC || + token.getType() == Token.DEC || + token.getType() == Token.ADD || + token.getType() == Token.DEC) { + // Handle the case x +/- ++/-- y + // We must keep a white space here. Otherwise, x +++ y would be + // interpreted as x ++ + y by the compiler, which is a bug (due + // to the implicit assignment being done on the wrong variable) + result.append(' '); + } else if (token.getType() == Token.POS && getToken(-1).getType() == Token.ADD || + token.getType() == Token.NEG && getToken(-1).getType() == Token.SUB) { + // Handle the case x + + y and x - - y + result.append(' '); + } + } + break; + + case Token.FUNCTION: + result.append("function"); + token = consumeToken(); + if (token.getType() == Token.NAME) { + result.append(' '); + symbol = token.getValue(); + identifier = getIdentifier(symbol, currentScope); + assert identifier != null; + if (identifier.getMungedValue() != null) { + result.append(identifier.getMungedValue()); + } else { + result.append(symbol); + } + if (currentScope != globalScope && identifier.getRefcount() == 0) { + warn("The symbol " + symbol + " is declared but is apparently never used.\nThis code can probably be written in a more compact way.", true); + } + token = consumeToken(); + } + assert token.getType() == Token.LP; + result.append('('); + currentScope = (ScriptOrFnScope) indexedScopes.get(new Integer(offset)); + enterScope(currentScope); + while ((token = consumeToken()).getType() != Token.RP) { + assert token.getType() == Token.NAME || token.getType() == Token.COMMA; + if (token.getType() == Token.NAME) { + symbol = token.getValue(); + identifier = getIdentifier(symbol, currentScope); + assert identifier != null; + if (identifier.getMungedValue() != null) { + result.append(identifier.getMungedValue()); + } else { + result.append(symbol); + } + } else if (token.getType() == Token.COMMA) { + result.append(','); + } + } + result.append(')'); + token = consumeToken(); + assert token.getType() == Token.LC; + result.append('{'); + braceNesting++; + token = getToken(0); + if (token.getType() == Token.STRING && + getToken(1).getType() == Token.SEMI) { + // This is a hint. Skip it! + consumeToken(); + consumeToken(); + } + break; + + case Token.RETURN: + case Token.TYPEOF: + result.append(literals.get(new Integer(token.getType()))); + // No space needed after 'return' and 'typeof' when followed + // by '(', '[', '{', a string or a regexp. + if (offset < length) { + token = getToken(0); + if (token.getType() != Token.LP && + token.getType() != Token.LB && + token.getType() != Token.LC && + token.getType() != Token.STRING && + token.getType() != Token.REGEXP && + token.getType() != Token.SEMI) { + result.append(' '); + } + } + break; + + case Token.CASE: + case Token.THROW: + result.append(literals.get(new Integer(token.getType()))); + // White-space needed after 'case' and 'throw' when not followed by a string. + if (offset < length && getToken(0).getType() != Token.STRING) { + result.append(' '); + } + break; + + case Token.BREAK: + case Token.CONTINUE: + result.append(literals.get(new Integer(token.getType()))); + if (offset < length && getToken(0).getType() != Token.SEMI) { + // If 'break' or 'continue' is not followed by a semi-colon, it must + // be followed by a label, hence the need for a white space. + result.append(' '); + } + break; + + case Token.LC: + result.append('{'); + braceNesting++; + break; + + case Token.RC: + result.append('}'); + braceNesting--; + assert braceNesting >= currentScope.getBraceNesting(); + if (braceNesting == currentScope.getBraceNesting()) { + leaveCurrentScope(); + } + break; + + case Token.SEMI: + // No need to output a semi-colon if the next character is a right-curly... + if (preserveAllSemiColons || offset < length && getToken(0).getType() != Token.RC) { + result.append(';'); + } + + if (linebreakpos >= 0 && result.length() - linestartpos > linebreakpos) { + // Some source control tools don't like it when files containing lines longer + // than, say 8000 characters, are checked in. The linebreak option is used in + // that case to split long lines after a specific column. + result.append('\n'); + linestartpos = result.length(); + } + break; + + case Token.SPECIALCOMMENT: + if (result.length() > 0 && result.charAt(result.length() - 1) != '\n') { + result.append("\n"); + } + result.append("/*"); + result.append(symbol); + result.append("*/\n"); + break; + + default: + String literal = (String) literals.get(new Integer(token.getType())); + if (literal != null) { + result.append(literal); + } else { + warn("This symbol cannot be printed: " + symbol, true); + } + break; + } + } + + // Append a semi-colon at the end, even if unnecessary semi-colons are + // supposed to be removed. This is especially useful when concatenating + // several minified files (the absence of an ending semi-colon at the + // end of one file may very likely cause a syntax error) + if (!preserveAllSemiColons && result.length() > 0) { + if (result.charAt(result.length() - 1) == '\n') { + result.setCharAt(result.length() - 1, ';'); + } else { + result.append(';'); + } + } + + return result; + } +} diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptIdentifier.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptIdentifier.java new file mode 100644 index 0000000..8668f49 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptIdentifier.java @@ -0,0 +1,55 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +import yuicompressor.org.mozilla.javascript.Token; + +/** + * JavaScriptIdentifier represents a variable/function identifier. + */ +class JavaScriptIdentifier extends JavaScriptToken { + + private int refcount = 0; + private String mungedValue; + private ScriptOrFnScope declaredScope; + private boolean markedForMunging = true; + + JavaScriptIdentifier(String value, ScriptOrFnScope declaredScope) { + super(Token.NAME, value); + this.declaredScope = declaredScope; + } + + ScriptOrFnScope getDeclaredScope() { + return declaredScope; + } + + void setMungedValue(String value) { + mungedValue = value; + } + + String getMungedValue() { + return mungedValue; + } + + void preventMunging() { + markedForMunging = false; + } + + boolean isMarkedForMunging() { + return markedForMunging; + } + + void incrementRefcount() { + refcount++; + } + + int getRefcount() { + return refcount; + } +} diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptToken.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptToken.java new file mode 100644 index 0000000..fee21d9 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/JavaScriptToken.java @@ -0,0 +1,28 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +public class JavaScriptToken { + + private int type; + private String value; + + JavaScriptToken(int type, String value) { + this.type = type; + this.value = value; + } + + int getType() { + return type; + } + + String getValue() { + return value; + } +} diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/ScriptOrFnScope.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/ScriptOrFnScope.java new file mode 100644 index 0000000..c1a2e47 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/ScriptOrFnScope.java @@ -0,0 +1,169 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +import java.util.ArrayList; +import java.util.Enumeration; +import java.util.Hashtable; + +class ScriptOrFnScope { + + private int braceNesting; + private ScriptOrFnScope parentScope; + private ArrayList subScopes; + private Hashtable identifiers = new Hashtable(); + private Hashtable hints = new Hashtable(); + private boolean markedForMunging = true; + private int varcount = 0; + + ScriptOrFnScope(int braceNesting, ScriptOrFnScope parentScope) { + this.braceNesting = braceNesting; + this.parentScope = parentScope; + this.subScopes = new ArrayList(); + if (parentScope != null) { + parentScope.subScopes.add(this); + } + } + + int getBraceNesting() { + return braceNesting; + } + + ScriptOrFnScope getParentScope() { + return parentScope; + } + + JavaScriptIdentifier declareIdentifier(String symbol) { + JavaScriptIdentifier identifier = (JavaScriptIdentifier) identifiers.get(symbol); + if (identifier == null) { + identifier = new JavaScriptIdentifier(symbol, this); + identifiers.put(symbol, identifier); + } + return identifier; + } + + JavaScriptIdentifier getIdentifier(String symbol) { + return (JavaScriptIdentifier) identifiers.get(symbol); + } + + void addHint(String variableName, String variableType) { + hints.put(variableName, variableType); + } + + void preventMunging() { + if (parentScope != null) { + // The symbols in the global scope don't get munged, + // but the sub-scopes it contains do get munged. + markedForMunging = false; + } + } + + private ArrayList getUsedSymbols() { + ArrayList result = new ArrayList(); + Enumeration elements = identifiers.elements(); + while (elements.hasMoreElements()) { + JavaScriptIdentifier identifier = (JavaScriptIdentifier) elements.nextElement(); + String mungedValue = identifier.getMungedValue(); + if (mungedValue == null) { + mungedValue = identifier.getValue(); + } + result.add(mungedValue); + } + return result; + } + + private ArrayList getAllUsedSymbols() { + ArrayList result = new ArrayList(); + ScriptOrFnScope scope = this; + while (scope != null) { + result.addAll(scope.getUsedSymbols()); + scope = scope.parentScope; + } + return result; + } + + int incrementVarCount() { + varcount++; + return varcount; + } + + void munge() { + + if (!markedForMunging) { + // Stop right here if this scope was flagged as unsafe for munging. + return; + } + + int pickFromSet = 1; + + // Do not munge symbols in the global scope! + if (parentScope != null) { + + ArrayList freeSymbols = new ArrayList(); + + freeSymbols.addAll(JavaScriptCompressor.ones); + freeSymbols.removeAll(getAllUsedSymbols()); + if (freeSymbols.size() == 0) { + pickFromSet = 2; + freeSymbols.addAll(JavaScriptCompressor.twos); + freeSymbols.removeAll(getAllUsedSymbols()); + } + if (freeSymbols.size() == 0) { + pickFromSet = 3; + freeSymbols.addAll(JavaScriptCompressor.threes); + freeSymbols.removeAll(getAllUsedSymbols()); + } + if (freeSymbols.size() == 0) { + throw new IllegalStateException("The YUI Compressor ran out of symbols. Aborting..."); + } + + // APPJET: sort identifiers by popularity + JavaScriptIdentifier idArray[] = ((Hashtable<String,JavaScriptIdentifier>)identifiers).values().toArray(new JavaScriptIdentifier[0]); + java.util.Arrays.sort(idArray, new java.util.Comparator<JavaScriptIdentifier>() { + public int compare(JavaScriptIdentifier i1, JavaScriptIdentifier i2) { + return i2.getRefcount() - i1.getRefcount(); // positive if i2 is more popular, indicating i2 should come first + } + }); + java.util.Iterator<JavaScriptIdentifier> elements = java.util.Arrays.asList(idArray).iterator(); + + //Enumeration elements = identifiers.elements(); + while (elements.hasNext()) { + if (freeSymbols.size() == 0) { + pickFromSet++; + if (pickFromSet == 2) { + freeSymbols.addAll(JavaScriptCompressor.twos); + } else if (pickFromSet == 3) { + freeSymbols.addAll(JavaScriptCompressor.threes); + } else { + throw new IllegalStateException("The YUI Compressor ran out of symbols. Aborting..."); + } + // It is essential to remove the symbols already used in + // the containing scopes, or some of the variables declared + // in the containing scopes will be redeclared, which can + // lead to errors. + freeSymbols.removeAll(getAllUsedSymbols()); + } + + String mungedValue; + JavaScriptIdentifier identifier = (JavaScriptIdentifier) elements.next(); + if (identifier.isMarkedForMunging()) { + mungedValue = (String) freeSymbols.remove(0); + } else { + mungedValue = identifier.getValue(); + } + identifier.setMungedValue(mungedValue); + } + } + + for (int i = 0; i < subScopes.size(); i++) { + ScriptOrFnScope scope = (ScriptOrFnScope) subScopes.get(i); + scope.munge(); + } + } +} diff --git a/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/YUICompressor.java b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/YUICompressor.java new file mode 100644 index 0000000..dcbaff4 --- /dev/null +++ b/infrastructure/yuicompressor/src/com/yahoo/platform/yui/compressor/YUICompressor.java @@ -0,0 +1,232 @@ +/* + * YUI Compressor + * Author: Julien Lecomte <jlecomte@yahoo-inc.com> + * Copyright (c) 2007, Yahoo! Inc. All rights reserved. + * Code licensed under the BSD License: + * http://developer.yahoo.net/yui/license.txt + */ + +package com.yahoo.platform.yui.compressor; + +import jargs.gnu.CmdLineParser; +import yuicompressor.org.mozilla.javascript.ErrorReporter; +import yuicompressor.org.mozilla.javascript.EvaluatorException; + +import java.io.*; +import java.nio.charset.Charset; + +public class YUICompressor { + + public static void main(String args[]) { + + CmdLineParser parser = new CmdLineParser(); + CmdLineParser.Option typeOpt = parser.addStringOption("type"); + CmdLineParser.Option verboseOpt = parser.addBooleanOption('v', "verbose"); + CmdLineParser.Option nomungeOpt = parser.addBooleanOption("nomunge"); + CmdLineParser.Option linebreakOpt = parser.addStringOption("line-break"); + CmdLineParser.Option preserveSemiOpt = parser.addBooleanOption("preserve-semi"); + CmdLineParser.Option disableOptimizationsOpt = parser.addBooleanOption("disable-optimizations"); + CmdLineParser.Option helpOpt = parser.addBooleanOption('h', "help"); + CmdLineParser.Option charsetOpt = parser.addStringOption("charset"); + CmdLineParser.Option outputFilenameOpt = parser.addStringOption('o', "output"); + + Reader in = null; + Writer out = null; + + try { + + parser.parse(args); + + Boolean help = (Boolean) parser.getOptionValue(helpOpt); + if (help != null && help.booleanValue()) { + usage(); + System.exit(0); + } + + boolean verbose = parser.getOptionValue(verboseOpt) != null; + + String charset = (String) parser.getOptionValue(charsetOpt); + if (charset == null || !Charset.isSupported(charset)) { + charset = System.getProperty("file.encoding"); + if (charset == null) { + charset = "UTF-8"; + } + if (verbose) { + System.err.println("\n[INFO] Using charset " + charset); + } + } + + String[] fileArgs = parser.getRemainingArgs(); + String type = (String) parser.getOptionValue(typeOpt); + + if (fileArgs.length == 0) { + + if (type == null || !type.equalsIgnoreCase("js") && !type.equalsIgnoreCase("css")) { + usage(); + System.exit(1); + } + + in = new InputStreamReader(System.in, charset); + + } else { + + if (type != null && !type.equalsIgnoreCase("js") && !type.equalsIgnoreCase("css")) { + usage(); + System.exit(1); + } + + String inputFilename = fileArgs[0]; + + if (type == null) { + int idx = inputFilename.lastIndexOf('.'); + if (idx >= 0 && idx < inputFilename.length() - 1) { + type = inputFilename.substring(idx + 1); + } + } + + if (type == null || !type.equalsIgnoreCase("js") && !type.equalsIgnoreCase("css")) { + usage(); + System.exit(1); + } + + in = new InputStreamReader(new FileInputStream(inputFilename), charset); + } + + int linebreakpos = -1; + String linebreakstr = (String) parser.getOptionValue(linebreakOpt); + if (linebreakstr != null) { + try { + linebreakpos = Integer.parseInt(linebreakstr, 10); + } catch (NumberFormatException e) { + usage(); + System.exit(1); + } + } + + String outputFilename = (String) parser.getOptionValue(outputFilenameOpt); + + if (type.equalsIgnoreCase("js")) { + + try { + + JavaScriptCompressor compressor = new JavaScriptCompressor(in, new ErrorReporter() { + + public void warning(String message, String sourceName, + int line, String lineSource, int lineOffset) { + if (line < 0) { + System.err.println("\n[WARNING] " + message); + } else { + System.err.println("\n[WARNING] " + line + ':' + lineOffset + ':' + message); + } + } + + public void error(String message, String sourceName, + int line, String lineSource, int lineOffset) { + if (line < 0) { + System.err.println("\n[ERROR] " + message); + } else { + System.err.println("\n[ERROR] " + line + ':' + lineOffset + ':' + message); + } + } + + public EvaluatorException runtimeError(String message, String sourceName, + int line, String lineSource, int lineOffset) { + error(message, sourceName, line, lineSource, lineOffset); + return new EvaluatorException(message); + } + }); + + // Close the input stream first, and then open the output stream, + // in case the output file should override the input file. + in.close(); in = null; + + if (outputFilename == null) { + out = new OutputStreamWriter(System.out, charset); + } else { + out = new OutputStreamWriter(new FileOutputStream(outputFilename), charset); + } + + boolean munge = parser.getOptionValue(nomungeOpt) == null; + boolean preserveAllSemiColons = parser.getOptionValue(preserveSemiOpt) != null; + boolean disableOptimizations = parser.getOptionValue(disableOptimizationsOpt) != null; + + compressor.compress(out, linebreakpos, munge, verbose, + preserveAllSemiColons, disableOptimizations); + + } catch (EvaluatorException e) { + + e.printStackTrace(); + // Return a special error code used specifically by the web front-end. + System.exit(2); + + } + + } else if (type.equalsIgnoreCase("css")) { + + CssCompressor compressor = new CssCompressor(in); + + // Close the input stream first, and then open the output stream, + // in case the output file should override the input file. + in.close(); in = null; + + if (outputFilename == null) { + out = new OutputStreamWriter(System.out, charset); + } else { + out = new OutputStreamWriter(new FileOutputStream(outputFilename), charset); + } + + compressor.compress(out, linebreakpos); + } + + } catch (CmdLineParser.OptionException e) { + + usage(); + System.exit(1); + + } catch (IOException e) { + + e.printStackTrace(); + System.exit(1); + + } finally { + + if (in != null) { + try { + in.close(); + } catch (IOException e) { + e.printStackTrace(); + } + } + + if (out != null) { + try { + out.close(); + } catch (IOException e) { + e.printStackTrace(); + } + } + } + } + + private static void usage() { + System.out.println( + "\nUsage: java -jar yuicompressor-x.y.z.jar [options] [input file]\n\n" + + + "Global Options\n" + + " -h, --help Displays this information\n" + + " --type <js|css> Specifies the type of the input file\n" + + " --charset <charset> Read the input file using <charset>\n" + + " --line-break <column> Insert a line break after the specified column number\n" + + " -v, --verbose Display informational messages and warnings\n" + + " -o <file> Place the output into <file>. Defaults to stdout.\n\n" + + + "JavaScript Options\n" + + " --nomunge Minify only, do not obfuscate\n" + + " --preserve-semi Preserve all semicolons\n" + + " --disable-optimizations Disable all micro optimizations\n\n" + + + "If no input file is specified, it defaults to stdin. In this case, the 'type'\n" + + "option is required. Otherwise, the 'type' option is required only if the input\n" + + "file extension is neither 'js' nor 'css'."); + } +} |