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Add for-loop

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This commit is contained in:
Valk Richard Li
2019-11-20 23:31:07 +08:00
committed by GitHub
parent 504b9fe140
commit f7f6eb9ea3
3 changed files with 181 additions and 30 deletions
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balloon/balloon_parse.h
+87 -14
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@@ -265,29 +265,102 @@ abstract_syntax_tree balloon_parse::choose()
abstract_syntax_tree balloon_parse::loop()
{
abstract_syntax_tree new_node;
new_node.set_type(__while);
get_token();
if(this_token.type!=__while)
if(this_token.type!=__while && this_token.type!=__for)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": must use \'while\' when generating a loop."<<std::endl;
std::cout<<">>[Parse-error] line "<<this_token.line<<": must use \'while\' or \'for\' when generating a loop."<<std::endl;
return new_node;
}
new_node.set_type(this_token.type);
new_node.set_line(this_token.line);
get_token();
if(this_token.type!=__left_curve)
if(this_token.type==__while)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \'(\'."<<std::endl;
return new_node;
get_token();
if(this_token.type!=__left_curve)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \'(\'."<<std::endl;
return new_node;
}
new_node.add_child(scalar());
get_token();
if(this_token.type!=__right_curve)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \')\'."<<std::endl;
return new_node;
}
}
new_node.add_child(scalar());
get_token();
if(this_token.type!=__right_curve)
else if(this_token.type==__for)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \')\'."<<std::endl;
return new_node;
get_token();
if(this_token.type!=__left_curve)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \'(\'."<<std::endl;
return new_node;
}
abstract_syntax_tree nullnode;
nullnode.set_type(__null_node);
nullnode.set_line(this_token.line);
get_token();
if(this_token.type!=__semi)
{
if(this_token.type==__var)
{
parse.push(this_token);
new_node.add_child(definition());
}
else if(this_token.type==__id)
{
parse.push(this_token);
new_node.add_child(call_identifier());
}
else
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": must use definition or assignment or nothing here."<<std::endl;
return new_node;
}
}
else
{
parse.push(this_token);
new_node.add_child(nullnode);
}
check_semi();
get_token();
if(this_token.type!=__semi)
{
parse.push(this_token);
new_node.add_child(scalar());
}
else
{
parse.push(this_token);
new_node.add_child(nullnode);
}
check_semi();
get_token();
if(this_token.type!=__semi)
{
parse.push(this_token);
new_node.add_child(scalar());
}
else
{
parse.push(this_token);
new_node.add_child(nullnode);
}
get_token();
if(this_token.type!=__right_curve)
{
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": expect a \')\'."<<std::endl;
return new_node;
}
}
new_node.add_child(block());
return new_node;