//获得单一变量
private CodeObject GetOneObject()
{
CodeObject ret = null;
Token token = ReadToken();
bool not = false;
bool negative = false;
CALC calc = CALC.NONE;
if (token.Type == TokenType.Not) {
not = true;
token = ReadToken();
} else if (token.Type == TokenType.Minus) {
negative = true;
token = ReadToken();
} else if (token.Type == TokenType.Increment) {
calc = CALC.PRE_INCREMENT;
token = ReadToken();
} else if (token.Type == TokenType.Decrement) {
calc = CALC.PRE_DECREMENT;
token = ReadToken();
}
switch (token.Type)
{
case TokenType.Identifier:
ret = new CodeMember((string)token.Lexeme);
break;
case TokenType.Function:
UndoToken();
ret = new CodeFunction(ParseFunctionDeclaration(false));
break;
case TokenType.LeftPar:
ret = new CodeRegion(GetObject());
ReadRightParenthesis();
break;
case TokenType.LeftBracket:
UndoToken();
ret = GetArray();
break;
case TokenType.LeftBrace:
UndoToken();
ret = GetTable();
break;
case TokenType.Eval:
ret = GetEval();
break;
case TokenType.Null:
ret = new CodeScriptObject(m_script, null);
break;
case TokenType.Boolean:
case TokenType.Number:
case TokenType.String:
case TokenType.SimpleString:
ret = new CodeScriptObject(m_script, token.Lexeme);
break;
default:
throw new ParserException("Object起始关键字错误 ", token);
}
ret.StackInfo = new StackInfo(m_strBreviary, token.SourceLine);
ret = GetVariable(ret);
ret.Not = not;
ret.Negative = negative;
if (ret is CodeMember) {
if (calc != CALC.NONE) {
((CodeMember)ret).Calc = calc;
} else {
Token peek = ReadToken();
if (peek.Type == TokenType.Increment) {
calc = CALC.POST_INCREMENT;
} else if (peek.Type == TokenType.Decrement) {
calc = CALC.POST_DECREMENT;
} else {
UndoToken();
}
if (calc != CALC.NONE) {
((CodeMember)ret).Calc = calc;
}
}
} else if (calc != CALC.NONE) {
throw new ParserException("++ 或者 -- 只支持变量的操作", token);
}
return ret;
}
ScriptObject ParseScriptObject(CodeScriptObject obj)
{
//此处原先使用Clone 是因为 number 和 string 有自运算的操作 会影响常量 但是现在设置变量会调用Assign() 基础类型会自动复制一次 所以去掉clone
return obj.Object;
//return obj.Object.Clone();
}
ScriptObject ParseScriptObject(CodeScriptObject obj)
{
return obj.Object.Clone();
}
