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Rhino JavaScript Java Library Source Code
Rhino JavaScript Java Library is an open-source implementation of JavaScript written entirely in Java.
Rhino JavaScript Java Library Source Code files are provided in binary package (rhino-1.7.14.zip).
You can also browse the source code below:
✍: FYIcenter.com
⏎ org/mozilla/javascript/Decompiler.java
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ package org.mozilla.javascript; import java.math.BigInteger; import org.mozilla.javascript.ast.FunctionNode; /** * 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. * * <p>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. * * <p>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(); if (functionType != FunctionNode.ARROW_FUNCTION) { 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 addTemplateLiteral(String str) { addToken(Token.TEMPLATE_CHARS); 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); } } } void addBigInt(BigInteger n) { addToken(Token.BIGINT); appendString(n.toString()); } 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(); StringBuilder result = new StringBuilder(); 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: case Token.METHOD: if (source.charAt(i) == Token.GET) { result.append("get "); } else if (source.charAt(i) == Token.SET) { result.append("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.BIGINT: i = printSourceBigInt(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.LET: result.append("let "); 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.YIELD: result.append("yield "); break; case Token.YIELD_STAR: result.append("yield *"); 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.EXP: 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; case Token.DEBUGGER: result.append("debugger;\n"); break; case Token.ARROW: result.append(" => "); break; case Token.TEMPLATE_LITERAL: result.append("`"); break; case Token.TEMPLATE_LITERAL_SUBST: result.append("${"); break; case Token.TEMPLATE_CHARS: i = printSourceString(source, i + 1, false, result); continue; 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, StringBuilder 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, StringBuilder 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; } /** * @see #printSourceString(String source, int offset, boolean asQuotedString, StringBuilder sb) */ private static int printSourceBigInt(String source, int offset, StringBuilder 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); sb.append('n'); } return offset + length; } 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; }
⏎ org/mozilla/javascript/Decompiler.java
Or download all of them as a single archive file:
File name: rhino-1.7.14-sources.jar File size: 1029165 bytes Release date: 2022-01-06 Download
⇒ Example code to Test rhino-runtime-1.7.14.jar
⇐ Download Rhino JavaScript Binary Package
2022-05-03, 35419👍, 1💬
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