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Add continue|break|return

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This commit is contained in:
Valk Richard Li
2019-11-11 23:31:20 +08:00
committed by GitHub
parent c273acdcf6
commit 0661792a0e
3 changed files with 88 additions and 35 deletions
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balloon/abstract_syntax_tree.cpp
+77 -27
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@@ -5,7 +5,39 @@ int exit_type=0;
bool abstract_syntax_tree::check()
{
bool ret=false;
if(this->type==__cmp_equal)
{
}
else if(this->type==__cmp_not_equal)
{
}
else if(this->type==__cmp_less)
{
}
else if(this->type==__cmp_less_or_equal)
{
}
else if(this->type==__cmp_more)
{
}
else if(this->type==__cmp_more_or_equal)
{
}
else if(this->type==__or_operator)
{
}
else if(this->type==__and_operator)
{
}
return true;
}
@@ -123,24 +155,42 @@ void abstract_syntax_tree::run_root()
return;
}
void abstract_syntax_tree::run_loop()
int abstract_syntax_tree::run_loop()
{
int ret=0;
scope.add_new_local_scope();
abstract_syntax_tree condition=children.front();
abstract_syntax_tree blk=children.back();
while(condition.check())
blk.run_block();
{
int type=blk.run_block();
if(type==__break)
break;
else if(type==__return)
{
ret=__return;
break;
}
}
scope.pop_last_local_scope();
return;
return ret;
}
void abstract_syntax_tree::run_ifelse()
int abstract_syntax_tree::run_ifelse()
{
int ret=0;
scope.add_new_local_scope();
for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
{
if(i->children.front().check())
{
ret=i->children.back().run_block();
break;
}
}
scope.pop_last_local_scope();
return;
return ret;
}
void abstract_syntax_tree::run_func()
@@ -184,31 +234,31 @@ int abstract_syntax_tree::run_block()
else if(i->type==__id)
std::cout<<i->call_id().get_name()<<std::endl;
else if(i->type==__while)
i->run_loop();
{
int type=i->run_loop();
if(type)
{
if(type==__return)
return type;
else
{
std::cout<<"[Runtime-error] incorrect use of break/continue."<<std::endl;
exit_type=__error_command_use;
}
}
}
else if(i->type==__ifelse)
i->run_ifelse();
{
int type=i->run_ifelse();
if(type)
return type;
}
else if(i->type==__continue)
{
return __continue;
// else
// {
// std::cout<<">>[Runtime-error] must use \'continue\' in a loop."<<std::endl;
// exit_type=__error_command_use;
// }
}
else if(i->type==__break)
{
return __loop;
// else
// {
// std::cout<<">>[Runtime-error] must use \'continue\' in a loop."<<std::endl;
// exit_type=__error_command_use;
// }
}
return __break;
else if(i->type==__return)
{
break;
}
return __return;
if(exit_type!=__process_exited_successfully)
break;
}