public void Excute(string script)
{
var rs = Lexer.Analyzer(script);
_stack = new VariableStack();
//初始化全局变量
foreach (var token in rs.Where(it => it.TokenType == TokenType.AssignmentDefine).Cast <TokenAssignment>())
{
ExcuteAssignment(token);
}
//获取所有函数定义
_functions = rs.Where(it => it.TokenType == TokenType.FunctionDefine)
.Cast <TokenFunctionDefine>()
.ToDictionary(it => it.Name, it => it);
if (!_functions.ContainsKey("main"))
{
throw new Exception("没有找到main方法");
}
var main = _functions["main"];
ExcuteFunction(main);
_stack.Pop(_stack.Count());
}
/// <summary>
/// 执行代码块
/// </summary>
/// <param name="block"></param>
private ScriptValue ExcuteBlock(TokenBlockStement block)
{
var size = _stack.Count();
try
{
ScriptValue value = null;
foreach (var stement in block.Stements)
{
if (stement is TokenFunctionCallStement call)
{
ExcuteCall(call);
}
else if (stement is TokenAssignment assignment)
{
ExcuteAssignment(assignment);
}
else if (stement is TokenConditionBlock condition)
{
value = ExcuteCondition(condition);
if (value != null)
{
break;
}
}
else if (stement is TokenReturnStement returnStement)
{
value = ExcuteReturnStement(returnStement);
break;
}
}
return(value);
}
finally
{
_stack.Pop(_stack.Count() - size);
}
}