/*
* function_definition : decl_specs declarator decl_list compound_stat
| declarator decl_list compound_stat
| decl_specs declarator compound_stat
| declarator compound_stat
| ;
|
| external_decl : function_definition
| decl
| ;
*/
private IParseResult ParseExternalDecl()
{
var declSpecs = ParseDeclSpecs();
if (!declSpecs.IsSuccess)
{
return(declSpecs);
}
if (!declSpecs.IsNullStat() && Accept(OperatorType.SEMICOLON))
{
return(new SuccessParseResult(new Decl(declSpecs.ResultNode as DeclSpecs, new InitDeclaratorList())));
}
var initDeclarator = ParseInitDeclarator();
if (!initDeclarator.IsSuccess)
{
return(initDeclarator);
}
var initDeclaratorList = new InitDeclaratorList();
initDeclaratorList.Add(initDeclarator.ResultNode);
if (!declSpecs.IsNullStat() && Accept(OperatorType.SEMICOLON))
{
return(new SuccessParseResult(new Decl(declSpecs.ResultNode as DeclSpecs, initDeclaratorList)));
}
var declList = ParseDeclList();
if (!declList.IsSuccess)
{
return(declList);
}
var compoundStat = ParseCompoundStat();
if (!compoundStat.IsSuccess)
{
return(compoundStat);
}
if (initDeclarator.ResultNode is InitDeclarator declarator && !compoundStat.IsNullStat())
{
return(new SuccessParseResult(new FuncDef(declSpecs.ResultNode, declarator,
declList.ResultNode, compoundStat.ResultNode as CompoundStat)));
}
if (initDeclarator.IsNullStat() && declSpecs.IsNullStat() && declList.IsNullStat())
{
return(new SuccessParseResult(new NullStat()));
}
return(new FailedParseResult("the external declaration is incorrectly", _currentToken));
}
public Decl(DeclSpecs declSpec, InitDeclaratorList initDeclaratorList)
{
DeclSpec = declSpec;
InitDeclaratorList = initDeclaratorList;
}