diff options
Diffstat (limited to 'infrastructure/yuicompressor/src/yuicompressor/org/mozilla/javascript/Decompiler.java.orig')
| -rw-r--r-- | infrastructure/yuicompressor/src/yuicompressor/org/mozilla/javascript/Decompiler.java.orig | 910 |
1 files changed, 0 insertions, 910 deletions
diff --git a/infrastructure/yuicompressor/src/yuicompressor/org/mozilla/javascript/Decompiler.java.orig b/infrastructure/yuicompressor/src/yuicompressor/org/mozilla/javascript/Decompiler.java.orig deleted file mode 100644 index cdb00b7..0000000 --- a/infrastructure/yuicompressor/src/yuicompressor/org/mozilla/javascript/Decompiler.java.orig +++ /dev/null @@ -1,910 +0,0 @@ -/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- - * - * ***** BEGIN LICENSE BLOCK ***** - * Version: MPL 1.1/GPL 2.0 - * - * The contents of this file are subject to the Mozilla Public License Version - * 1.1 (the "License"); you may not use this file except in compliance with - * the License. You may obtain a copy of the License at - * http://www.mozilla.org/MPL/ - * - * Software distributed under the License is distributed on an "AS IS" basis, - * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License - * for the specific language governing rights and limitations under the - * License. - * - * The Original Code is Rhino code, released - * May 6, 1999. - * - * The Initial Developer of the Original Code is - * Netscape Communications Corporation. - * Portions created by the Initial Developer are Copyright (C) 1997-1999 - * the Initial Developer. All Rights Reserved. - * - * Contributor(s): - * Mike Ang - * Igor Bukanov - * Bob Jervis - * Mike McCabe - * - * Alternatively, the contents of this file may be used under the terms of - * the GNU General Public License Version 2 or later (the "GPL"), in which - * case the provisions of the GPL are applicable instead of those above. If - * you wish to allow use of your version of this file only under the terms of - * the GPL and not to allow others to use your version of this file under the - * MPL, indicate your decision by deleting the provisions above and replacing - * them with the notice and other provisions required by the GPL. If you do - * not delete the provisions above, a recipient may use your version of this - * file under either the MPL or the GPL. - * - * ***** END LICENSE BLOCK ***** */ - -package org.mozilla.javascript; - -/** - * The following class save decompilation information about the source. - * Source information is returned from the parser as a String - * associated with function nodes and with the toplevel script. When - * saved in the constant pool of a class, this string will be UTF-8 - * encoded, and token values will occupy a single byte. - - * Source is saved (mostly) as token numbers. The tokens saved pretty - * much correspond to the token stream of a 'canonical' representation - * of the input program, as directed by the parser. (There were a few - * cases where tokens could have been left out where decompiler could - * easily reconstruct them, but I left them in for clarity). (I also - * looked adding source collection to TokenStream instead, where I - * could have limited the changes to a few lines in getToken... but - * this wouldn't have saved any space in the resulting source - * representation, and would have meant that I'd have to duplicate - * parser logic in the decompiler to disambiguate situations where - * newlines are important.) The function decompile expands the - * tokens back into their string representations, using simple - * lookahead to correct spacing and indentation. - * - * Assignments are saved as two-token pairs (Token.ASSIGN, op). Number tokens - * are stored inline, as a NUMBER token, a character representing the type, and - * either 1 or 4 characters representing the bit-encoding of the number. String - * types NAME, STRING and OBJECT are currently stored as a token type, - * followed by a character giving the length of the string (assumed to - * be less than 2^16), followed by the characters of the string - * inlined into the source string. Changing this to some reference to - * to the string in the compiled class' constant pool would probably - * save a lot of space... but would require some method of deriving - * the final constant pool entry from information available at parse - * time. - */ -public class Decompiler -{ - /** - * Flag to indicate that the decompilation should omit the - * function header and trailing brace. - */ - public static final int ONLY_BODY_FLAG = 1 << 0; - - /** - * Flag to indicate that the decompilation generates toSource result. - */ - public static final int TO_SOURCE_FLAG = 1 << 1; - - /** - * Decompilation property to specify initial ident value. - */ - public static final int INITIAL_INDENT_PROP = 1; - - /** - * Decompilation property to specify default identation offset. - */ - public static final int INDENT_GAP_PROP = 2; - - /** - * Decompilation property to specify identation offset for case labels. - */ - public static final int CASE_GAP_PROP = 3; - - // Marker to denote the last RC of function so it can be distinguished from - // the last RC of object literals in case of function expressions - private static final int FUNCTION_END = Token.LAST_TOKEN + 1; - - String getEncodedSource() - { - return sourceToString(0); - } - - int getCurrentOffset() - { - return sourceTop; - } - - int markFunctionStart(int functionType) - { - int savedOffset = getCurrentOffset(); - addToken(Token.FUNCTION); - append((char)functionType); - return savedOffset; - } - - int markFunctionEnd(int functionStart) - { - int offset = getCurrentOffset(); - append((char)FUNCTION_END); - return offset; - } - - void addToken(int token) - { - if (!(0 <= token && token <= Token.LAST_TOKEN)) - throw new IllegalArgumentException(); - - append((char)token); - } - - void addEOL(int token) - { - if (!(0 <= token && token <= Token.LAST_TOKEN)) - throw new IllegalArgumentException(); - - append((char)token); - append((char)Token.EOL); - } - - void addName(String str) - { - addToken(Token.NAME); - appendString(str); - } - - void addString(String str) - { - addToken(Token.STRING); - appendString(str); - } - - void addRegexp(String regexp, String flags) - { - addToken(Token.REGEXP); - appendString('/' + regexp + '/' + flags); - } - - void addNumber(double n) - { - addToken(Token.NUMBER); - - /* encode the number in the source stream. - * Save as NUMBER type (char | char char char char) - * where type is - * 'D' - double, 'S' - short, 'J' - long. - - * We need to retain float vs. integer type info to keep the - * behavior of liveconnect type-guessing the same after - * decompilation. (Liveconnect tries to present 1.0 to Java - * as a float/double) - * OPT: This is no longer true. We could compress the format. - - * This may not be the most space-efficient encoding; - * the chars created below may take up to 3 bytes in - * constant pool UTF-8 encoding, so a Double could take - * up to 12 bytes. - */ - - long lbits = (long)n; - if (lbits != n) { - // if it's floating point, save as a Double bit pattern. - // (12/15/97 our scanner only returns Double for f.p.) - lbits = Double.doubleToLongBits(n); - append('D'); - append((char)(lbits >> 48)); - append((char)(lbits >> 32)); - append((char)(lbits >> 16)); - append((char)lbits); - } - else { - // we can ignore negative values, bc they're already prefixed - // by NEG - if (lbits < 0) Kit.codeBug(); - - // will it fit in a char? - // this gives a short encoding for integer values up to 2^16. - if (lbits <= Character.MAX_VALUE) { - append('S'); - append((char)lbits); - } - else { // Integral, but won't fit in a char. Store as a long. - append('J'); - append((char)(lbits >> 48)); - append((char)(lbits >> 32)); - append((char)(lbits >> 16)); - append((char)lbits); - } - } - } - - private void appendString(String str) - { - int L = str.length(); - int lengthEncodingSize = 1; - if (L >= 0x8000) { - lengthEncodingSize = 2; - } - int nextTop = sourceTop + lengthEncodingSize + L; - if (nextTop > sourceBuffer.length) { - increaseSourceCapacity(nextTop); - } - if (L >= 0x8000) { - // Use 2 chars to encode strings exceeding 32K, were the highest - // bit in the first char indicates presence of the next byte - sourceBuffer[sourceTop] = (char)(0x8000 | (L >>> 16)); - ++sourceTop; - } - sourceBuffer[sourceTop] = (char)L; - ++sourceTop; - str.getChars(0, L, sourceBuffer, sourceTop); - sourceTop = nextTop; - } - - private void append(char c) - { - if (sourceTop == sourceBuffer.length) { - increaseSourceCapacity(sourceTop + 1); - } - sourceBuffer[sourceTop] = c; - ++sourceTop; - } - - private void increaseSourceCapacity(int minimalCapacity) - { - // Call this only when capacity increase is must - if (minimalCapacity <= sourceBuffer.length) Kit.codeBug(); - int newCapacity = sourceBuffer.length * 2; - if (newCapacity < minimalCapacity) { - newCapacity = minimalCapacity; - } - char[] tmp = new char[newCapacity]; - System.arraycopy(sourceBuffer, 0, tmp, 0, sourceTop); - sourceBuffer = tmp; - } - - private String sourceToString(int offset) - { - if (offset < 0 || sourceTop < offset) Kit.codeBug(); - return new String(sourceBuffer, offset, sourceTop - offset); - } - - /** - * Decompile the source information associated with this js - * function/script back into a string. For the most part, this - * just means translating tokens back to their string - * representations; there's a little bit of lookahead logic to - * decide the proper spacing/indentation. Most of the work in - * mapping the original source to the prettyprinted decompiled - * version is done by the parser. - * - * @param source encoded source tree presentation - * - * @param flags flags to select output format - * - * @param properties indentation properties - * - */ - public static String decompile(String source, int flags, - UintMap properties) - { - int length = source.length(); - if (length == 0) { return ""; } - - int indent = properties.getInt(INITIAL_INDENT_PROP, 0); - if (indent < 0) throw new IllegalArgumentException(); - int indentGap = properties.getInt(INDENT_GAP_PROP, 4); - if (indentGap < 0) throw new IllegalArgumentException(); - int caseGap = properties.getInt(CASE_GAP_PROP, 2); - if (caseGap < 0) throw new IllegalArgumentException(); - - StringBuffer result = new StringBuffer(); - boolean justFunctionBody = (0 != (flags & Decompiler.ONLY_BODY_FLAG)); - boolean toSource = (0 != (flags & Decompiler.TO_SOURCE_FLAG)); - - // Spew tokens in source, for debugging. - // as TYPE number char - if (printSource) { - System.err.println("length:" + length); - for (int i = 0; i < length; ++i) { - // Note that tokenToName will fail unless Context.printTrees - // is true. - String tokenname = null; - if (Token.printNames) { - tokenname = Token.name(source.charAt(i)); - } - if (tokenname == null) { - tokenname = "---"; - } - String pad = tokenname.length() > 7 - ? "\t" - : "\t\t"; - System.err.println - (tokenname - + pad + (int)source.charAt(i) - + "\t'" + ScriptRuntime.escapeString - (source.substring(i, i+1)) - + "'"); - } - System.err.println(); - } - - int braceNesting = 0; - boolean afterFirstEOL = false; - int i = 0; - int topFunctionType; - if (source.charAt(i) == Token.SCRIPT) { - ++i; - topFunctionType = -1; - } else { - topFunctionType = source.charAt(i + 1); - } - - if (!toSource) { - // add an initial newline to exactly match js. - result.append('\n'); - for (int j = 0; j < indent; j++) - result.append(' '); - } else { - if (topFunctionType == FunctionNode.FUNCTION_EXPRESSION) { - result.append('('); - } - } - - while (i < length) { - switch(source.charAt(i)) { - case Token.GET: - case Token.SET: - result.append(source.charAt(i) == Token.GET ? "get " : "set "); - ++i; - i = printSourceString(source, i + 1, false, result); - // Now increment one more to get past the FUNCTION token - ++i; - break; - - case Token.NAME: - case Token.REGEXP: // re-wrapped in '/'s in parser... - i = printSourceString(source, i + 1, false, result); - continue; - - case Token.STRING: - i = printSourceString(source, i + 1, true, result); - continue; - - case Token.NUMBER: - i = printSourceNumber(source, i + 1, result); - continue; - - case Token.TRUE: - result.append("true"); - break; - - case Token.FALSE: - result.append("false"); - break; - - case Token.NULL: - result.append("null"); - break; - - case Token.THIS: - result.append("this"); - break; - - case Token.FUNCTION: - ++i; // skip function type - result.append("function "); - break; - - case FUNCTION_END: - // Do nothing - break; - - case Token.COMMA: - result.append(", "); - break; - - case Token.LC: - ++braceNesting; - if (Token.EOL == getNext(source, length, i)) - indent += indentGap; - result.append('{'); - break; - - case Token.RC: { - --braceNesting; - /* don't print the closing RC if it closes the - * toplevel function and we're called from - * decompileFunctionBody. - */ - if (justFunctionBody && braceNesting == 0) - break; - - result.append('}'); - switch (getNext(source, length, i)) { - case Token.EOL: - case FUNCTION_END: - indent -= indentGap; - break; - case Token.WHILE: - case Token.ELSE: - indent -= indentGap; - result.append(' '); - break; - } - break; - } - case Token.LP: - result.append('('); - break; - - case Token.RP: - result.append(')'); - if (Token.LC == getNext(source, length, i)) - result.append(' '); - break; - - case Token.LB: - result.append('['); - break; - - case Token.RB: - result.append(']'); - break; - - case Token.EOL: { - if (toSource) break; - boolean newLine = true; - if (!afterFirstEOL) { - afterFirstEOL = true; - if (justFunctionBody) { - /* throw away just added 'function name(...) {' - * and restore the original indent - */ - result.setLength(0); - indent -= indentGap; - newLine = false; - } - } - if (newLine) { - result.append('\n'); - } - - /* add indent if any tokens remain, - * less setback if next token is - * a label, case or default. - */ - if (i + 1 < length) { - int less = 0; - int nextToken = source.charAt(i + 1); - if (nextToken == Token.CASE - || nextToken == Token.DEFAULT) - { - less = indentGap - caseGap; - } else if (nextToken == Token.RC) { - less = indentGap; - } - - /* elaborate check against label... skip past a - * following inlined NAME and look for a COLON. - */ - else if (nextToken == Token.NAME) { - int afterName = getSourceStringEnd(source, i + 2); - if (source.charAt(afterName) == Token.COLON) - less = indentGap; - } - - for (; less < indent; less++) - result.append(' '); - } - break; - } - case Token.DOT: - result.append('.'); - break; - - case Token.NEW: - result.append("new "); - break; - - case Token.DELPROP: - result.append("delete "); - break; - - case Token.IF: - result.append("if "); - break; - - case Token.ELSE: - result.append("else "); - break; - - case Token.FOR: - result.append("for "); - break; - - case Token.IN: - result.append(" in "); - break; - - case Token.WITH: - result.append("with "); - break; - - case Token.WHILE: - result.append("while "); - break; - - case Token.DO: - result.append("do "); - break; - - case Token.TRY: - result.append("try "); - break; - - case Token.CATCH: - result.append("catch "); - break; - - case Token.FINALLY: - result.append("finally "); - break; - - case Token.THROW: - result.append("throw "); - break; - - case Token.SWITCH: - result.append("switch "); - break; - - case Token.BREAK: - result.append("break"); - if (Token.NAME == getNext(source, length, i)) - result.append(' '); - break; - - case Token.CONTINUE: - result.append("continue"); - if (Token.NAME == getNext(source, length, i)) - result.append(' '); - break; - - case Token.CASE: - result.append("case "); - break; - - case Token.DEFAULT: - result.append("default"); - break; - - case Token.RETURN: - result.append("return"); - if (Token.SEMI != getNext(source, length, i)) - result.append(' '); - break; - - case Token.VAR: - result.append("var "); - break; - - case Token.SEMI: - result.append(';'); - if (Token.EOL != getNext(source, length, i)) { - // separators in FOR - result.append(' '); - } - break; - - case Token.ASSIGN: - result.append(" = "); - break; - - case Token.ASSIGN_ADD: - result.append(" += "); - break; - - case Token.ASSIGN_SUB: - result.append(" -= "); - break; - - case Token.ASSIGN_MUL: - result.append(" *= "); - break; - - case Token.ASSIGN_DIV: - result.append(" /= "); - break; - - case Token.ASSIGN_MOD: - result.append(" %= "); - break; - - case Token.ASSIGN_BITOR: - result.append(" |= "); - break; - - case Token.ASSIGN_BITXOR: - result.append(" ^= "); - break; - - case Token.ASSIGN_BITAND: - result.append(" &= "); - break; - - case Token.ASSIGN_LSH: - result.append(" <<= "); - break; - - case Token.ASSIGN_RSH: - result.append(" >>= "); - break; - - case Token.ASSIGN_URSH: - result.append(" >>>= "); - break; - - case Token.HOOK: - result.append(" ? "); - break; - - case Token.OBJECTLIT: - // pun OBJECTLIT to mean colon in objlit property - // initialization. - // This needs to be distinct from COLON in the general case - // to distinguish from the colon in a ternary... which needs - // different spacing. - result.append(':'); - break; - - case Token.COLON: - if (Token.EOL == getNext(source, length, i)) - // it's the end of a label - result.append(':'); - else - // it's the middle part of a ternary - result.append(" : "); - break; - - case Token.OR: - result.append(" || "); - break; - - case Token.AND: - result.append(" && "); - break; - - case Token.BITOR: - result.append(" | "); - break; - - case Token.BITXOR: - result.append(" ^ "); - break; - - case Token.BITAND: - result.append(" & "); - break; - - case Token.SHEQ: - result.append(" === "); - break; - - case Token.SHNE: - result.append(" !== "); - break; - - case Token.EQ: - result.append(" == "); - break; - - case Token.NE: - result.append(" != "); - break; - - case Token.LE: - result.append(" <= "); - break; - - case Token.LT: - result.append(" < "); - break; - - case Token.GE: - result.append(" >= "); - break; - - case Token.GT: - result.append(" > "); - break; - - case Token.INSTANCEOF: - result.append(" instanceof "); - break; - - case Token.LSH: - result.append(" << "); - break; - - case Token.RSH: - result.append(" >> "); - break; - - case Token.URSH: - result.append(" >>> "); - break; - - case Token.TYPEOF: - result.append("typeof "); - break; - - case Token.VOID: - result.append("void "); - break; - - case Token.CONST: - result.append("const "); - break; - - case Token.NOT: - result.append('!'); - break; - - case Token.BITNOT: - result.append('~'); - break; - - case Token.POS: - result.append('+'); - break; - - case Token.NEG: - result.append('-'); - break; - - case Token.INC: - result.append("++"); - break; - - case Token.DEC: - result.append("--"); - break; - - case Token.ADD: - result.append(" + "); - break; - - case Token.SUB: - result.append(" - "); - break; - - case Token.MUL: - result.append(" * "); - break; - - case Token.DIV: - result.append(" / "); - break; - - case Token.MOD: - result.append(" % "); - break; - - case Token.COLONCOLON: - result.append("::"); - break; - - case Token.DOTDOT: - result.append(".."); - break; - - case Token.DOTQUERY: - result.append(".("); - break; - - case Token.XMLATTR: - result.append('@'); - break; - - default: - // If we don't know how to decompile it, raise an exception. - throw new RuntimeException("Token: " + - Token.name(source.charAt(i))); - } - ++i; - } - - if (!toSource) { - // add that trailing newline if it's an outermost function. - if (!justFunctionBody) - result.append('\n'); - } else { - if (topFunctionType == FunctionNode.FUNCTION_EXPRESSION) { - result.append(')'); - } - } - - return result.toString(); - } - - private static int getNext(String source, int length, int i) - { - return (i + 1 < length) ? source.charAt(i + 1) : Token.EOF; - } - - private static int getSourceStringEnd(String source, int offset) - { - return printSourceString(source, offset, false, null); - } - - private static int printSourceString(String source, int offset, - boolean asQuotedString, - 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); - if (!asQuotedString) { - sb.append(str); - } else { - sb.append('"'); - sb.append(ScriptRuntime.escapeString(str)); - sb.append('"'); - } - } - 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) { - int ival = source.charAt(offset); - number = ival; - } - ++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 |= 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 char[] sourceBuffer = new char[128]; - -// Per script/function source buffer top: parent source does not include a -// nested functions source and uses function index as a reference instead. - private int sourceTop; - -// whether to do a debug print of the source information, when decompiling. - private static final boolean printSource = false; - -} |