/// <summary>
/// ClassStmt
/// CLASS ID LBRACES DeclarationStmt* RBRACES
/// </summary>
/// <returns></returns>
private ClassStmt ParseClassStmt()
{
Consume(TokenType.CLASS);
ClassStmt ret = new ClassStmt(Consume(TokenType.ID).Literal);
FuncStmt fs = null;
FuncStmt fcur = null;
VarStmt vs = null;
VarStmt vcur = null;
Consume(TokenType.LBRACES);
while (!Check(TokenType.RBRACES))
{
DeclarationStmt stmt = ParseDeclOrDefStmt();
if (stmt is FuncStmt)
{
AppendASTLinkedList(ref fs, ref fcur, (FuncStmt)stmt);
}
else
{
AppendASTLinkedList(ref vs, ref vcur, (VarStmt)stmt);
}
}
Consume(TokenType.RBRACES);
ret.Methods = fs;
ret.Fields = vs;
return(ret);
}
/// <summary>
/// 这里用了LookAhead
/// 此外不允许不带定义的声明
/// DeclarationStmt
/// ACCESS_FLAG* TypeExpr FuncDeclarator BlockStmt
/// ACCESS_FLAG* TypeExpr VarDeclarator SEMICOLON
/// </summary>
/// <returns></returns>
private DeclarationStmt ParseDeclOrDefStmt()
{
AccessFlag flag = ParserAccessFlag();
TypeExpr type = ParseTypeExpr();
if (Check(TokenType.LPAREN) || CheckAt(1, TokenType.LPAREN))
{
FuncStmt ret = ParseFuncDeclarator(type, flag);
ret.Body = ParseBlockStmt();
return(ret);
}
else
{
VarStmt ret = ParseVarDeclarator(type, flag);
Consume(TokenType.SEMICOLON);
return(ret);
}
}