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Nasal-Interpreter
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Add more functions

This commit is contained in:
Valk Richard Li 2019-10-19 21:18:57 +08:00 committed by GitHub
parent 6932820c28
commit 0d7482eae0
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 148 additions and 7 deletions
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2
version1.1/main.cpp
View File

@ -80,7 +80,7 @@ int main()
{
gen.set_ast_empty();
gen.gen_process(lex.return_list());
gen.gen_main_work();
//gen.gen_main_work();
}
}
else

153
version1.1/nasal_parser.h
View File

@ -113,6 +113,7 @@ class nasal_parser
void check_semi_at_end();
void statements_block();
void function_generate_expr();
void parameter_func_expr();
void return_expr();
};
void nasal_parser::check_semi_at_end()
@ -195,10 +196,11 @@ void nasal_parser::statements_block()
case __semi:break;
case __return:return_expr();check_semi_at_end();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": '";
print_token(this_token.type);
std::cout<<"' incorrect token as the beginning of statement."<<std::endl;
++error;
return;
break;
}
get_token();
@ -217,6 +219,29 @@ void nasal_parser::function_generate_expr()
{
if(this_token.type==__id)
{
get_token();
if(this_token.type!=__equal)
parse.push(this_token);
else
{
get_token();
switch(this_token.type)
{
case __left_curve:
case __id:
case __number:
case __string:
case __nor_operator:
case __sub_operator:parse.push(this_token);calculation_expr();break;
case __left_brace:hash_generate_expr();break;
case __left_bracket:list_generate_expr();break;
case __func:function_generate_expr();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": expect a scalar after operator '=' ."<<std::endl;
return;break;
}
}
get_token();
if(this_token.type!=__right_curve && this_token.type!=__comma)
{
@ -255,7 +280,18 @@ void nasal_parser::function_generate_expr()
std::cout<<"' when creating a __function."<<std::endl;
return;
}
statements_block();
get_token();
if(this_token.type==__left_brace)
{
parse.push(this_token);
statements_block();
}
else
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": function must have a statement block begin with '{' ."<<std::endl;
return;
}
return;
}
void nasal_parser::list_generate_expr()
@ -265,6 +301,8 @@ void nasal_parser::list_generate_expr()
{
switch(this_token.type)
{
case __nor_operator:
case __sub_operator:
case __left_curve:
case __number:
case __string:
@ -298,7 +336,7 @@ void nasal_parser::hash_generate_expr()
get_token();
while(this_token.type!=__right_brace)
{
if(this_token.type!=__id)
if(this_token.type!=__id && this_token.type!=__string)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token '";
@ -306,6 +344,11 @@ void nasal_parser::hash_generate_expr()
std::cout<<"' when creating a __hash_member."<<std::endl;
return;
}
if(this_token.type==__string || this_token.type==__number)
{
parse.push(this_token);
calculation_expr();
}
get_token();
if(this_token.type!=__colon)
{
@ -320,7 +363,19 @@ void nasal_parser::hash_generate_expr()
case __number:
case __string:
case __id:parse.push(this_token);calculation_expr();break;
case __func:function_generate_expr();break;
case __func:
get_token();
if(this_token.type==__id)
{
parse.push(this_token);
calculation_expr();
}
else
{
parse.push(this_token);
function_generate_expr();
}
break;
case __left_bracket:list_generate_expr();break;
case __left_brace:hash_generate_expr();break;
default:
@ -1191,6 +1246,61 @@ void nasal_parser::call_list_expr()
}
return;
}
void nasal_parser::parameter_func_expr()
{
get_token();
if(this_token.type!=__id)
{
parse.push(this_token);
}
get_token();
if(this_token.type==__left_curve)
{
get_token();
while(this_token.type!=__right_curve)
{
switch(this_token.type)
{
case __left_curve:
case __nor_operator:
case __sub_operator:
case __number:
case __string:
case __id:parse.push(this_token);calculation_expr();break;
case __left_bracket:list_generate_expr();break;
case __left_brace:hash_generate_expr();break;
case __func:parameter_func_expr();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token '";
print_token(this_token.type);
std::cout<<"' when calling a function."<<std::endl;
return;
break;
}
get_token();
if(this_token.type!=__comma && this_token.type!=__right_curve)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": expect a ',' after parameter or ')' to end the call."<<std::endl;
return;
}
else if(this_token.type==__comma)
get_token();
}
}
else
parse.push(this_token);
get_token();
if(this_token.type==__left_brace)
{
parse.push(this_token);
statements_block();
}
else
parse.push(this_token);
return;
}
void nasal_parser::call_function_expr()
{
get_token();
@ -1206,7 +1316,7 @@ void nasal_parser::call_function_expr()
case __id:parse.push(this_token);calculation_expr();break;
case __left_bracket:list_generate_expr();break;
case __left_brace:hash_generate_expr();break;
case __func:function_generate_expr();break;
case __func:parameter_func_expr();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token '";
@ -1216,6 +1326,32 @@ void nasal_parser::call_function_expr()
break;
}
get_token();
if(this_token.type==__colon)
{
get_token();
switch(this_token.type)
{
case __left_curve:
case __nor_operator:
case __sub_operator:
case __number:
case __string:
case __id:parse.push(this_token);calculation_expr();break;
case __left_bracket:list_generate_expr();break;
case __left_brace:hash_generate_expr();break;
case __func:parameter_func_expr();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token '";
print_token(this_token.type);
std::cout<<"' when calling a function."<<std::endl;
return;
break;
}
}
else
parse.push(this_token);
get_token();
if(this_token.type!=__comma && this_token.type!=__right_curve)
{
++error;
@ -1312,10 +1448,15 @@ void nasal_parser::parse_main_work()
case __forindex:parse.push(this_token);loop_expr();break;
case __semi:break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": \'";
print_token(this_token.type);
std::cout<<"\' when generating __main_statement_block."<<std::endl;
++error;
if(this_token.type==0)
{
std::cout<<">>[Error] parse stack empty."<<std::endl;
break;
}
break;
}
}