//获取一个Object
private CodeObject GetObject()
{
Stack<TempOperator> operateStack = new Stack<TempOperator>();
Stack<CodeObject> objectStack = new Stack<CodeObject>();
while (true) {
objectStack.Push(GetOneObject());
if (!P_Operator(operateStack, objectStack))
break;
}
while (operateStack.Count > 0) {
objectStack.Push(new CodeOperator(objectStack.Pop(), objectStack.Pop(), operateStack.Pop().Operator, m_strBreviary, GetSourceLine()));
}
CodeObject ret = objectStack.Pop();
if (ret is CodeMember) {
CodeMember member = ret as CodeMember;
if (member.Calc == CALC.NONE) {
Token token = ReadToken();
switch (token.Type) {
case TokenType.Assign:
case TokenType.AssignPlus:
case TokenType.AssignMinus:
case TokenType.AssignMultiply:
case TokenType.AssignDivide:
case TokenType.AssignModulo:
case TokenType.AssignCombine:
case TokenType.AssignInclusiveOr:
case TokenType.AssignXOR:
case TokenType.AssignShr:
case TokenType.AssignShi:
ret = new CodeAssign(member, GetObject(), token.Type, m_strBreviary, token.SourceLine);
break;
default:
UndoToken();
break;
}
}
}
if (PeekToken ().Type == TokenType.QuestionMark) {
ReadToken();
CodeTernary ternary = new CodeTernary();
ternary.Allow = ret;
ternary.True = GetObject();
ReadColon();
ternary.False = GetObject();
return ternary;
}
return ret;
}
ScriptObject ParseAssign(CodeAssign assign)
{
if (assign.AssignType == TokenType.Assign) {
var ret = ResolveOperand(assign.value);
SetVariable(assign.member, ret);
return ret;
} else {
return GetVariable(assign.member).AssignCompute(assign.AssignType, ResolveOperand(assign.value));
}
}
ScriptObject ParseAssign(CodeAssign assign)
{
if (assign.AssignType == TokenType.Assign) {
var ret = ResolveOperand(assign.value);
SetVariable(assign.member, ret);
return ret;
} else {
ScriptObject obj = GetVariable(assign.member);
ScriptString str = obj as ScriptString;
if (str != null)
{
if (assign.AssignType == TokenType.AssignPlus)
return str.AssignPlus(ResolveOperand(assign.value));
else
throw new ExecutionException(m_script, "string类型只支持[+=]赋值操作");
}
ScriptNumber num = obj as ScriptNumber;
if (num != null)
{
ScriptNumber right = ResolveOperand(assign.value) as ScriptNumber;
if (right == null)
throw new ExecutionException(m_script, "[+= -=...]值只能为 number类型");
return num.AssignCompute(assign.AssignType, right);
}
throw new ExecutionException(m_script, "[+= -=...]左边值只能为number或者string");
}
}