/// <param name="indent">How much to indent the decompiled result
///
/// </param>
/// <param name="flags">Flags specifying format of decompilation output
/// </param>
internal override string Decompile(int indent, int flags)
{
string encodedSource = EncodedSource;
if (encodedSource == null)
{
return(base.Decompile(indent, flags));
}
else
{
UintMap properties = new UintMap(1);
properties.put(Decompiler.INITIAL_INDENT_PROP, indent);
return(Decompiler.Decompile(encodedSource, flags, properties));
}
}
/// <summary> 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.
///
/// </summary>
/// <param name="source">encoded source tree presentation
///
/// </param>
/// <param name="flags">flags to select output format
///
/// </param>
/// <param name="properties">indentation properties
///
/// </param>
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 ArgumentException();
}
int indentGap = properties.getInt(INDENT_GAP_PROP, 4);
if (indentGap < 0)
{
throw new ArgumentException();
}
int caseGap = properties.getInt(CASE_GAP_PROP, 2);
if (caseGap < 0)
{
throw new ArgumentException();
}
System.Text.StringBuilder result = new System.Text.StringBuilder();
bool justFunctionBody = (0 != (flags & Decompiler.ONLY_BODY_FLAG));
bool toSource = (0 != (flags & Decompiler.TO_SOURCE_FLAG));
bool toString = (0 != (flags & Decompiler.TO_STRING_FLAG));
// Spew tokens in source, for debugging.
// as TYPE number char
if (printSource)
{
System.Console.Error.WriteLine("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 [i]);
}
if (tokenname == null)
{
tokenname = "---";
}
string pad = tokenname.Length > 7 ? "\t" : "\t\t";
System.Console.Error.WriteLine(tokenname + pad + (int)source [i] + "\t'" + ScriptRuntime.escapeString(source.Substring(i, (i + 1) - (i))) + "'");
}
System.Console.Error.WriteLine();
}
int braceNesting = 0;
bool afterFirstEOL = false;
int i2 = 0;
int topFunctionType;
if (source [i2] == Token.SCRIPT)
{
++i2;
topFunctionType = -1;
}
else
{
topFunctionType = source [i2 + 1];
}
if (!toSource)
{
if (!toString)
{
// 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 (i2 < length)
{
switch (source [i2])
{
case (char)(Token.NAME):
case (char)(Token.REGEXP): // re-wrapped in '/'s in parser...
i2 = PrintSourceString(source, i2 + 1, false, result);
continue;
case (char)(Token.STRING):
i2 = PrintSourceString(source, i2 + 1, true, result);
continue;
case (char)(Token.NUMBER):
i2 = PrintSourceNumber(source, i2 + 1, result);
continue;
case (char)(Token.TRUE):
result.Append("true");
break;
case (char)(Token.FALSE):
result.Append("false");
break;
case (char)(Token.NULL):
result.Append("null");
break;
case (char)(Token.THIS):
result.Append("this");
break;
case (char)(Token.FUNCTION):
++i2; // skip function type
result.Append("function ");
break;
case (char)(FUNCTION_END):
// Do nothing
break;
case (char)(Token.COMMA):
result.Append(", ");
break;
case (char)(Token.LC):
++braceNesting;
if (Token.EOL == GetNext(source, length, i2))
{
indent += indentGap;
}
result.Append('{');
break;
case (char)(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, i2))
{
case Token.EOL:
case FUNCTION_END:
indent -= indentGap;
break;
case Token.WHILE:
case Token.ELSE:
indent -= indentGap;
result.Append(' ');
break;
}
break;
}
case (char)(Token.LP):
result.Append('(');
break;
case (char)(Token.RP):
result.Append(')');
if (Token.LC == GetNext(source, length, i2))
{
result.Append(' ');
}
break;
case (char)(Token.LB):
result.Append('[');
break;
case (char)(Token.RB):
result.Append(']');
break;
case (char)(Token.EOL): {
if (toSource)
{
break;
}
bool newLine = true;
if (!afterFirstEOL)
{
afterFirstEOL = true;
if (justFunctionBody)
{
/* throw away just added 'function name(...) {'
* and restore the original indent
*/
result.Length = 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 (i2 + 1 < length)
{
int less = 0;
int nextToken = source [i2 + 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, i2 + 2);
if (source [afterName] == Token.COLON)
{
less = indentGap;
}
}
for (; less < indent; less++)
{
result.Append(' ');
}
}
break;
}
case (char)(Token.DOT):
result.Append('.');
break;
case (char)(Token.NEW):
result.Append("new ");
break;
case (char)(Token.DELPROP):
result.Append("delete ");
break;
case (char)(Token.IF):
result.Append("if ");
break;
case (char)(Token.ELSE):
result.Append("else ");
break;
case (char)(Token.FOR):
result.Append("for ");
break;
case (char)(Token.IN):
result.Append(" in ");
break;
case (char)(Token.WITH):
result.Append("with ");
break;
case (char)(Token.WHILE):
result.Append("while ");
break;
case (char)(Token.DO):
result.Append("do ");
break;
case (char)(Token.TRY):
result.Append("try ");
break;
case (char)(Token.CATCH):
result.Append("catch ");
break;
case (char)(Token.FINALLY):
result.Append("finally ");
break;
case (char)(Token.THROW):
result.Append("throw ");
break;
case (char)(Token.SWITCH):
result.Append("switch ");
break;
case (char)(Token.BREAK):
result.Append("break");
if (Token.NAME == GetNext(source, length, i2))
{
result.Append(' ');
}
break;
case (char)(Token.CONTINUE):
result.Append("continue");
if (Token.NAME == GetNext(source, length, i2))
{
result.Append(' ');
}
break;
case (char)(Token.CASE):
result.Append("case ");
break;
case (char)(Token.DEFAULT):
result.Append("default");
break;
case (char)(Token.RETURN):
result.Append("return");
if (Token.SEMI != GetNext(source, length, i2))
{
result.Append(' ');
}
break;
case (char)(Token.VAR):
result.Append("var ");
break;
case (char)(Token.SEMI):
result.Append(';');
if (Token.EOL != GetNext(source, length, i2))
{
// separators in FOR
result.Append(' ');
}
break;
case (char)(Token.ASSIGN):
result.Append(" = ");
break;
case (char)(Token.ASSIGN_ADD):
result.Append(" += ");
break;
case (char)(Token.ASSIGN_SUB):
result.Append(" -= ");
break;
case (char)(Token.ASSIGN_MUL):
result.Append(" *= ");
break;
case (char)(Token.ASSIGN_DIV):
result.Append(" /= ");
break;
case (char)(Token.ASSIGN_MOD):
result.Append(" %= ");
break;
case (char)(Token.ASSIGN_BITOR):
result.Append(" |= ");
break;
case (char)(Token.ASSIGN_BITXOR):
result.Append(" ^= ");
break;
case (char)(Token.ASSIGN_BITAND):
result.Append(" &= ");
break;
case (char)(Token.ASSIGN_LSH):
result.Append(" <<= ");
break;
case (char)(Token.ASSIGN_RSH):
result.Append(" >>= ");
break;
case (char)(Token.ASSIGN_URSH):
result.Append(" >>>= ");
break;
case (char)(Token.HOOK):
result.Append(" ? ");
break;
case (char)(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 (char)(Token.COLON):
if (Token.EOL == GetNext(source, length, i2))
{
// it's the end of a label
result.Append(':');
}
// it's the middle part of a ternary
else
{
result.Append(" : ");
}
break;
case (char)(Token.OR):
result.Append(" || ");
break;
case (char)(Token.AND):
result.Append(" && ");
break;
case (char)(Token.BITOR):
result.Append(" | ");
break;
case (char)(Token.BITXOR):
result.Append(" ^ ");
break;
case (char)(Token.BITAND):
result.Append(" & ");
break;
case (char)(Token.SHEQ):
result.Append(" === ");
break;
case (char)(Token.SHNE):
result.Append(" !== ");
break;
case (char)(Token.EQ):
result.Append(" == ");
break;
case (char)(Token.NE):
result.Append(" != ");
break;
case (char)(Token.LE):
result.Append(" <= ");
break;
case (char)(Token.LT):
result.Append(" < ");
break;
case (char)(Token.GE):
result.Append(" >= ");
break;
case (char)(Token.GT):
result.Append(" > ");
break;
case (char)(Token.INSTANCEOF):
result.Append(" instanceof ");
break;
case (char)(Token.LSH):
result.Append(" << ");
break;
case (char)(Token.RSH):
result.Append(" >> ");
break;
case (char)(Token.URSH):
result.Append(" >>> ");
break;
case (char)(Token.TYPEOF):
result.Append("typeof ");
break;
case (char)(Token.VOID):
result.Append("void ");
break;
case (char)(Token.NOT):
result.Append('!');
break;
case (char)(Token.BITNOT):
result.Append('~');
break;
case (char)(Token.POS):
result.Append('+');
break;
case (char)(Token.NEG):
result.Append('-');
break;
case (char)(Token.INC):
result.Append("++");
break;
case (char)(Token.DEC):
result.Append("--");
break;
case (char)(Token.ADD):
result.Append(" + ");
break;
case (char)(Token.SUB):
result.Append(" - ");
break;
case (char)(Token.MUL):
result.Append(" * ");
break;
case (char)(Token.DIV):
result.Append(" / ");
break;
case (char)(Token.MOD):
result.Append(" % ");
break;
case (char)(Token.COLONCOLON):
result.Append("::");
break;
case (char)(Token.DOTDOT):
result.Append("..");
break;
case (char)(Token.DOTQUERY):
result.Append(".(");
break;
case (char)(Token.XMLATTR):
result.Append('@');
break;
default:
// If we don't know how to decompile it, raise an exception.
throw new ApplicationException();
}
++i2;
}
if (!toSource)
{
// add that trailing newline if it's an outermost function.
if (!justFunctionBody && !toString)
{
result.Append('\n');
}
}
else
{
if (topFunctionType == FunctionNode.FUNCTION_EXPRESSION)
{
result.Append(')');
}
}
return(result.ToString());
}
