/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 2002 Harri Porten (porten@kde.org)
 *  Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 *  Copyright (C) 2003 Apple Computer, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#include <ctype.h>
#include <stdio.h>
#include <config.h>

#include "nodes.h"
#include "function.h"
#include "scriptfunction.h"

#define NOINLINE
#if COMPILER(CWP)
#pragma auto_inline off
#elif COMPILER(MSVC)
#pragma auto_inline(off)
#elif COMPILER(GCC)
// #undef  NOINLINE
// #define NOINLINE    __attribute__ (noinline)
#endif

// GCC cstring uses these automatically, but not all implementations do.
using std::strlen;
using std::strcpy;
using std::strncpy;
using std::memset;
using std::memcpy;

namespace KJS {
  const bool kDontQuote = false, kQuote = true;

  /**
   * A simple text streaming class that helps with code indentation.
   */
  class SourceStream {
  public:
    enum eEndl     { Endl };
    enum eIndent   { Indent };
    enum eUnindent { Unindent };

    static const int kBufSize = 2048;
    typedef unsigned short UTF16;
    SourceStream () : indent(0), bufUsed(0) {}
    const UString& toString() { flush(); return str; }
    SourceStream& operator<<(const Identifier& s) NOINLINE;
    SourceStream& operator<<(const UString& s) NOINLINE;
    SourceStream& operator<<(const char* s) NOINLINE;
    SourceStream& operator<<(char s) NOINLINE;
    SourceStream& operator<<(eEndl) NOINLINE;
    SourceStream& operator<<(const Node* n) NOINLINE;
    SourceStream& operator<<(Operator op) NOINLINE;
    inline SourceStream& operator<<(eIndent)    { indent += 2; return *this; }
    inline SourceStream& operator<<(eUnindent)  { indent -= 2; return *this; }
    SourceStream& append(const Node* expr1, const char* sep, const Node* expr2) NOINLINE;
    SourceStream& append(const RefPtr<Node>& expr1, const char* sep, const RefPtr<Node>& expr2) NOINLINE;
    SourceStream& append(const UTF16* src, int srcLen) NOINLINE;
    SourceStream& append(const UString& inStr, bool quote) NOINLINE;
    template <typename T>
    inline SourceStream& operator<<(const RefPtr<T>& n) { return this->operator<<(n.get()); }
  private:
    UString str;
    int indent;
    int bufUsed;
    UTF16 buffer[kBufSize];
    void flush() NOINLINE;
    void put(UTF16 ch) { buffer[bufUsed++] = ch; }
    void put(char ch) { buffer[bufUsed++] = static_cast<unsigned char>(ch); }
  };
}

using namespace KJS;

SourceStream& SourceStream::operator<<(Operator op)
{
  assert(op == OpPlusPlus || op == OpMinusMinus);
  return *this << ((op == OpPlusPlus) ? "++" : "--");
}

void SourceStream::flush()
{
  if (bufUsed)
  {
    str.append(UString(reinterpret_cast<const UChar*>(buffer), bufUsed));
    bufUsed = 0;
  }
}

SourceStream& SourceStream::operator<<(char c)
{
  if (bufUsed == kBufSize)
    flush();
  put(c);
  return *this;
}

SourceStream& SourceStream::operator<<(const char *s)
{
  assert(strlen(s) < 100);
  if (bufUsed > kBufSize - 100)
    flush();

  unsigned char ch;
  int i = bufUsed;
  --s;
  for (UTF16* dst = &buffer[i] - 1; (ch = *++s) != 0; ++i)
    *++dst = ch;
  bufUsed = i;

  return *this;
}

SourceStream& SourceStream::operator<<(const UString &s)
{
  return append(&s.data()->uc, s.size());
}

SourceStream& SourceStream::operator<<(const Identifier &s)
{
  return append(s.ustring(), kDontQuote);
}

SourceStream& SourceStream::operator<<(const Node *n)
{
  if (n)
    n->streamTo(*this);
  return *this;
}

SourceStream& SourceStream::operator<<(eEndl)
{
  if (bufUsed > kBufSize - 1 - indent)
    flush();
  put('\n');

  if (indent > 0)
  {
    UTF16* dst = &buffer[bufUsed];
    for (int i = indent; i > 0; --i)
      *dst++ = ' ';
    bufUsed += indent;
  }

  return *this;
}

SourceStream& SourceStream::append(const Node* expr1, const char* sep, const Node* expr2)
{
  return *this << expr1 << sep << expr2;
}

SourceStream&
SourceStream::append(const RefPtr<Node>& expr1, const char* sep, const RefPtr<Node>& expr2)
{
  return *this << expr1 << sep << expr2;
}

SourceStream& SourceStream::append(const UTF16* src, int srcLen)
{
  if (kBufSize - bufUsed < srcLen)
    flush();
  if (kBufSize - bufUsed < srcLen)
    str.append(UString(reinterpret_cast<const UChar*>(src), srcLen));
  else
  {
    UTF16* dst = &buffer[bufUsed];
    bufUsed += srcLen;
//    while (--srcLen >= 0)
    while (srcLen-- > 0)
      *dst++ = *src++;
  }

  return *this;
}

// Append a quoted string
SourceStream& SourceStream::append(const UString& inStr, bool quote)
{
  if (quote)
    *this << '"';
  const UTF16* src = &inStr.data()->uc;
  const size_t size = inStr.size();
  for (size_t i = 0; i < size; ++i) {
    if (bufUsed >= kBufSize - 8)
      flush();
    UTF16 c = *src++, esc = '\\';
    switch (c) {
      case '\"':                break;
      case '\n':    c = 'n';    break;
      case '\r':    c = 'r';    break;
      case '\t':    c = 't';    break;
      case '\\':                break;
      default:
        if (c >= 128 || !isprint(c)) { // ### FIXME: use Unicode tables
          char hexValue[8];
          int len = sprintf(hexValue, (c < 256) ? "\\x%02X" : "\\u%04X", c);
          UTF16* dst = &buffer[bufUsed];
          bufUsed += len;
          for (int j = 0; j < len; ++j)
            dst[j] = hexValue[j];
          continue;
        }
        esc = 0;    // don't escape
        break;
    }
    if (esc) put(esc);
    put(c);
  }

  if (quote)
    *this << '"';
  return *this;
}

UString FunctionImp::toSource() const
{
  SourceStream str;
  str << "function ";
  str.append(functionName().ustring(), kDontQuote) << '(';
  const FunctionBodyNode* body = this->body.get();
  const int numParams = body->numParams();
  for (int i = 0; i < numParams; ++i) {
    if (i > 0)
        str << ", ";
    str << body->paramName(i).ustring();
  }
  str << ") ";
  body->streamTo(str);

  return str.toString();
}

UString Node::toString() const
{
  SourceStream str;
  streamTo(str);

  return str.toString();
}

void NullNode::streamTo(SourceStream &s) const { s << "null"; }

void BooleanNode::streamTo(SourceStream &s) const
{
    s << (value() ? "true" : "false");
}

void NumberNode::streamTo(SourceStream &s) const
{
    s << UString::from(value());
}

void StringNode::streamTo(SourceStream &s) const
{
    s.append(value(), kQuote);
}

void RegExpNode::streamTo(SourceStream &s) const
{
    s <<  '/' << pattern << '/' << flags;
}

void ThisNode::streamTo(SourceStream &s) const { s << "this"; }

void VarAccessNode::streamTo(SourceStream &s) const { s << ident; }

void GroupNode::streamTo(SourceStream &s) const
{
  s << '(' << group << ')';
}

void ElementNode::streamTo(SourceStream &s) const
{
  for (const ElementNode *n = this; n; n = n->next.get()) {
    for (int i = 0; i < n->elision; i++)
      s << ',';
    s << n->node;
    if (n->next)
        s << ',';
  }
}

void ArrayNode::streamTo(SourceStream &s) const
{
  s << '[' << element;
  for (int i = 0; i < elision; i++)
    s << ',';
  // Parser consumes one elision comma if there's array elements
  // present in the expression.
  if (opt && element)
    s << ',';
  s << ']';
}

void ObjectLiteralNode::streamTo(SourceStream &s) const
{
  if (list)
    s << "{ " << list << " }";
  else
    s << "{ }";
}

void PropertyListNode::streamTo(SourceStream &s) const
{
  s << node;

  for (const PropertyListNode *n = next.get(); n; n = n->next.get())
    s << ", " << n->node;
}

void PropertyNode::streamTo(SourceStream &s) const
{
  switch (type) {
    case Constant:
      s << name << ": " << assign;
      break;
    case Getter:
    case Setter: {
      const FuncExprNode *func = static_cast<const FuncExprNode *>(assign.get());
      if (type == Getter)
        s << "get ";
      else
        s << "set ";

      s << name << '(' << func->param << ')' << func->body;
      break;
    }
  }
}

void PropertyNameNode::streamTo(SourceStream &s) const
{
  s.append(str.ustring(), kQuote);
}

void BracketAccessorNode::streamTo(SourceStream &s) const
{
  s.append(expr1, "[", expr2) << ']';
}

void DotAccessorNode::streamTo(SourceStream &s) const
{
  s << expr << '.' << ident;
}

void ArgumentListNode::streamTo(SourceStream &s) const
{
  s << expr;
  for (ArgumentListNode *n = next.get(); n; n = n->next.get())
    s << ", " << n->expr;
}

void ArgumentsNode::streamTo(SourceStream &s) const
{
  s << '(' << list << ')';
}

void NewExprNode::streamTo(SourceStream &s) const
{
  s << "new " << expr << args;
}

void FunctionCallValueNode::streamTo(SourceStream &s) const
{
  s << expr << args;
}

void FunctionCallReferenceNode::streamTo(SourceStream &s) const
{
  s << expr << args;
}

void PostfixNode::streamTo(SourceStream &s) const
{
  s << m_loc << m_oper;
}

void DeleteReferenceNode::streamTo(SourceStream &s) const
{
  s << "delete " << loc;
}

void DeleteValueNode::streamTo(SourceStream &s) const
{
  s << "delete " << m_expr;
}

void VoidNode::streamTo(SourceStream &s) const
{
  s << "void " << expr;
}

void TypeOfValueNode::streamTo(SourceStream &s) const
{
  s << "typeof " << m_expr;
}

void TypeOfVarNode::streamTo(SourceStream &s) const
{
  s << "typeof " << loc;
}

void PrefixNode::streamTo(SourceStream &s) const
{
  s << m_oper << m_loc;
}

void UnaryPlusNode::streamTo(SourceStream &s) const
{
  s << "+ " << expr;
}

void NegateNode::streamTo(SourceStream &s) const
{
  s << "- " << expr;
}

void BitwiseNotNode::streamTo(SourceStream &s) const
{
  s << '~' << expr;
}

void LogicalNotNode::streamTo(SourceStream &s) const
{
  s << '!' << expr;
}

void BinaryOperatorNode::streamTo(SourceStream& s) const
{
    const char* opStr;
    switch (oper) {
    case OpMult:
	opStr = " * ";
	break;
    case OpDiv:
	opStr = " / ";
	break;
    case OpMod:
	opStr = " % ";
	break;
    case OpPlus:
	opStr = " + ";
	break;
    case OpMinus:
	opStr = " - ";
	break;
    case OpLShift:
	opStr = " << ";
	break;
    case OpRShift:
	opStr = " >> ";
	break;
    case OpURShift:
	opStr = " >>> ";
	break;
    case OpLess:
	opStr = " < ";
	break;
    case OpGreaterEq:
	opStr = " >= ";
	break;
    case OpGreater:
	opStr = " > ";
	break;
    case OpLessEq:
	opStr = " <= ";
	break;
    case OpIn:
	opStr = " in ";
	break;
    case OpInstanceOf:
	opStr = " instanceof ";
	break;
    case OpEqEq:
	opStr = " == ";
	break;
    case OpNotEq:
	opStr = " != ";
	break;
    case OpStrEq:
	opStr = " === ";
	break;
    case OpStrNEq:
	opStr = " !== ";
	break;
    case OpBitAnd:
	opStr = " & ";
	break;
    case OpBitXOr:
	opStr = " ^ ";
	break;
    case OpBitOr:
	opStr = " | ";
	break;
    default:
	assert(!"Unhandled case in BinaryOperatorNode::streamTo()");
	opStr = " ??? ";
	break;
    }
    s.append(expr1, opStr, expr2);
}

void BinaryLogicalNode::streamTo(SourceStream &s) const
{
  s.append(expr1, (oper == OpAnd ? " && " : " || "), expr2);
}

void ConditionalNode::streamTo(SourceStream &s) const
{
  s << logical << " ? ";
  s.append(expr1, " : ", expr2);
}

static void streamAssignmentOperatorTo(SourceStream &s, Operator oper)
{
  const char *opStr;
  switch (oper) {
  case OpEqual:
    opStr = " = ";
    break;
  case OpMultEq:
    opStr = " *= ";
    break;
  case OpDivEq:
    opStr = " /= ";
    break;
  case OpPlusEq:
    opStr = " += ";
    break;
  case OpMinusEq:
    opStr = " -= ";
    break;
  case OpLShift:
    opStr = " <<= ";
    break;
  case OpRShift:
    opStr = " >>= ";
    break;
  case OpURShift:
    opStr = " >>>= ";
    break;
  case OpAndEq:
    opStr = " &= ";
    break;
  case OpXOrEq:
    opStr = " ^= ";
    break;
  case OpOrEq:
    opStr = " |= ";
    break;
  case OpModEq:
    opStr = " %= ";
    break;
  default:
    opStr = " ?= ";
  }
  s << opStr;
}

void AssignNode::streamTo(SourceStream &s) const
{
  s << m_loc;
  streamAssignmentOperatorTo(s, m_oper);
  s << m_right;
//  s.append(m_ident, opStr, m_right);
}

void CommaNode::streamTo(SourceStream &s) const
{
  s.append(expr1, ", ", expr2);
}

void AssignExprNode::streamTo(SourceStream &s) const
{
  s << " = " << expr;
}

void VarDeclNode::streamTo(SourceStream &s) const
{
  s << ident << init;
}

void VarDeclListNode::streamTo(SourceStream &s) const
{
  s << "var " << var;
  for (VarDeclListNode *n = next.get(); n; n = n->next.get())
    s << ", " << n->var;
}

void VarStatementNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << next << ';';
}

void BlockNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << '{' << SourceStream::Indent
    << source << SourceStream::Unindent << SourceStream::Endl << '}';
}

void EmptyStatementNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << ';';
}

void ExprStatementNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << expr << ';';
}

void IfNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "if (" << expr << ')' << SourceStream::Indent
    << statement1 << SourceStream::Unindent;
  if (statement2)
    s << SourceStream::Endl << "else" << SourceStream::Indent
      << statement2 << SourceStream::Unindent;
}

void DoWhileNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "do " << SourceStream::Indent
    << statement << SourceStream::Unindent << SourceStream::Endl
    << "while (" << expr << ");";
}

void WhileNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "while (" << expr << ')' << SourceStream::Indent
    << statement << SourceStream::Unindent;
}

void ForNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "for ("
    << expr1
    << "; " << expr2
    << "; " << expr3
    << ')' << SourceStream::Indent << statement << SourceStream::Unindent;
}

void ForInNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "for (";
  if (varDecl)
    s << "var " << varDecl;
  else
    s << lexpr;

  s << " in " << expr << ')' << SourceStream::Indent
    << statement << SourceStream::Unindent;
}

void ContinueNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "continue";
  if (!ident.isNull())
    s << ' ' << ident;
  s << ';';
}

void BreakNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "break";
  if (!ident.isNull())
    s << ' ' << ident;
  s << ';';
}

void ReturnNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "return";
  if (value)
    s << ' ' << value;
  s << ';';
}

void WithNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "with (" << expr << ") "
    << statement;
}

void CaseClauseNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl;
  if (expr)
    s << "case " << expr;
  else
    s << "default";
  s << ':' << SourceStream::Indent;
  if (source)
    s << source;
  s << SourceStream::Unindent;
}

void ClauseListNode::streamTo(SourceStream &s) const
{
  for (const ClauseListNode *n = this; n; n = n->getNext())
    s << n->getClause();
}

void CaseBlockNode::streamTo(SourceStream &s) const
{
  for (const ClauseListNode *n = list1.get(); n; n = n->getNext())
    s << n->getClause();
  if (def)
    s << def;
  for (const ClauseListNode *n = list2.get(); n; n = n->getNext())
    s << n->getClause();
}

void SwitchNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "switch (" << expr << ") {"
    << SourceStream::Indent << block << SourceStream::Unindent
    << SourceStream::Endl << '}';
}

void LabelNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << label << ':' << SourceStream::Indent
    << statement << SourceStream::Unindent;
}

void ThrowNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "throw " << expr << ';';
}

void TryNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "try " << tryBlock;
  if (catchBlock)
    s << SourceStream::Endl << "catch (" << exceptionIdent << ')' << catchBlock;
  if (finallyBlock)
    s << SourceStream::Endl << "finally " << finallyBlock;
}

void ParameterNode::streamTo(SourceStream &s) const
{
  s << id;
  for (ParameterNode *n = next.get(); n; n = n->next.get())
    s << ", " << n->id;
}

void FuncDeclNode::streamTo(SourceStream &s) const
{
  s << SourceStream::Endl << "function " << ident << '(' << param << ')' << body;
}

void FuncExprNode::streamTo(SourceStream &s) const
{
  s << "function " << ident << '(' << param << ')' << body;
}

void SourceElementsNode::streamTo(SourceStream &s) const
{
  for (const SourceElementsNode *n = this; n; n = n->next.get())
    s << n->node;
}

void PackageNameNode::streamTo(SourceStream &s) const
{
    if (names)
        s << names << '.';
    s << id;
}

void ImportStatement::streamTo(SourceStream &s) const
{
    s << SourceStream::Endl << "import ";
    if (!al.isEmpty())
        s << al << " = ";
    s << name << (wld ? ".*;" : ";");
}

