📄 decompiler.java
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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.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(); } ++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 |= (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 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;}⌨️ 快捷键说明
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