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Nasal-Interpreter
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update

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Valk Richard Li 2019-09-22 04:17:03 -05:00 committed by GitHub
parent e7dbfff4bb
commit 9393f30b75
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 221 additions and 24 deletions
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245
version1.0/nasal_parser.h
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@ -130,6 +130,7 @@ class nasal_parser
void add_sub_expr(); void add_sub_expr();
void mul_div_expr(); void mul_div_expr();
void compare_operator_expr(); void compare_operator_expr();
void return_expr();
}; };
void nasal_parser::definition_expr() void nasal_parser::definition_expr()
{ {
@ -361,10 +362,149 @@ void nasal_parser::loop_expr()
} }
void nasal_parser::if_else_expr() void nasal_parser::if_else_expr()
{ {
get_token();
if(this_token.type!=__if)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": ";
return;
}
return; return;
} }
void nasal_parser::function_expr() void nasal_parser::function_expr()
{ {
get_token();
if(this_token.type==__left_curve)
{
get_token();
for(;this_token.type!=__right_curve;get_token())
{
switch(this_token.type)
{
case __id:
get_token();
if(this_token.type!=__comma && this_token.type!=__right_curve)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<" epxect a \',\' between parameters."<<std::endl;
return;
}
else if(this_token.type==__right_curve)
parse.push(this_token);
break;
case __dynamic_id:
get_token();
if(this_token.type!=__right_curve)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<"dynamic identifier should have nothing but \')\' after it."<<std::endl;
return;
}
else
parse.push(this_token);
break;
case __right_curve:
parse.push(this_token);
break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token \'";
print_token(this_token.type);
std::cout<<"\' when declaring a function."<<std::endl;
return;
break;
}
}
get_token();
if(this_token.type!=__left_brace)
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": missing elements after \'func\' ."<<std::endl;
return;
}
get_token();
for(;this_token.type!=__right_brace;get_token())
{
switch(this_token.type)
{
case __var:definition_expr();break;
case __id:identifier_begin_expr();break;
case __number:number_begin_expr();break;
case __string:string_begin_expr();break;
case __if:
parse.push(this_token);
if_else_expr();
break;
case __while:
case __for:
case __foreach:
case __forindex:
parse.push(this_token);
loop_expr();
break;
case __right_brace:
parse.push(this_token);
break;
case __return:
return_expr();
break;
case __semi:break;
default:
std::cout<<">>[Error] line "<<this_token.line<<": ";
print_token(this_token.type);
std::cout<<" in an incorrect place."<<std::endl;
++error;
break;
}
}
return;
}
else if(this_token.type==__left_brace)
{
get_token();
for(;this_token.type!=__right_brace;get_token())
{
switch(this_token.type)
{
case __var:definition_expr();break;
case __id:identifier_begin_expr();break;
case __number:number_begin_expr();break;
case __string:string_begin_expr();break;
case __if:
parse.push(this_token);
if_else_expr();
break;
case __while:
case __for:
case __foreach:
case __forindex:
parse.push(this_token);
loop_expr();
break;
case __right_brace:
parse.push(this_token);
break;
case __return:
return_expr();
break;
case __semi:break;
default:
std::cout<<">>[Error] line "<<this_token.line<<": ";
print_token(this_token.type);
std::cout<<" in an incorrect place."<<std::endl;
++error;
break;
}
}
return;
}
else
{
++error;
std::cout<<">>[Error] line "<<this_token.line<<": missing elements after \'func\' ."<<std::endl;
return;
}
return; return;
} }
void nasal_parser::list_init_generator() void nasal_parser::list_init_generator()
@ -484,6 +624,31 @@ void nasal_parser::list_search_expr()
{ {
case __left_bracket:list_search_expr();break; case __left_bracket:list_search_expr();break;
case __dot:hash_search_expr();break; case __dot:hash_search_expr();break;
case __add_operator:
case __sub_operator:add_sub_expr();break;
case __mul_operator:
case __div_operator:mul_div_expr();break;
case __link_operator:link_expr();break;
case __and_operator:
case __or_operator:
case __cmp_equal:
case __cmp_not_equal:
case __cmp_less:
case __cmp_more:
case __cmp_less_or_equal:
case __cmp_more_or_equal:
parse.push(this_token);
compare_operator_expr();
break;
case __equal:
case __add_equal:
case __sub_equal:
case __mul_equal:
case __div_equal:
case __link_equal:
parse.push(this_token);
assignment_expr();
break;
default: default:
parse.push(this_token); parse.push(this_token);
break; break;
@ -505,6 +670,31 @@ void nasal_parser::hash_search_expr()
case __left_curve:call_function_expr();break; case __left_curve:call_function_expr();break;
case __left_bracket:list_search_expr();break; case __left_bracket:list_search_expr();break;
case __dot:hash_search_expr();break; case __dot:hash_search_expr();break;
case __add_operator:
case __sub_operator:add_sub_expr();break;
case __mul_operator:
case __div_operator:mul_div_expr();break;
case __link_operator:link_expr();break;
case __and_operator:
case __or_operator:
case __cmp_equal:
case __cmp_not_equal:
case __cmp_less:
case __cmp_more:
case __cmp_less_or_equal:
case __cmp_more_or_equal:
parse.push(this_token);
compare_operator_expr();
break;
case __equal:
case __add_equal:
case __sub_equal:
case __mul_equal:
case __div_equal:
case __link_equal:
parse.push(this_token);
assignment_expr();
break;
case __semi:parse.push(this_token);break; case __semi:parse.push(this_token);break;
default: default:
++error; ++error;
@ -582,7 +772,15 @@ void nasal_parser::identifier_begin_expr()
parse.push(this_token); parse.push(this_token);
compare_operator_expr(); compare_operator_expr();
break; break;
case __equal:assignment_expr();break; case __equal:
case __add_equal:
case __sub_equal:
case __mul_equal:
case __div_equal:
case __link_equal:
parse.push(this_token);
assignment_expr();
break;
case __left_curve:call_function_expr();break; case __left_curve:call_function_expr();break;
case __left_bracket:list_search_expr();break; case __left_bracket:list_search_expr();break;
case __dot:hash_search_expr();break; case __dot:hash_search_expr();break;
@ -598,27 +796,6 @@ void nasal_parser::identifier_begin_expr()
std::cout<<"\" at this line."<<std::endl; std::cout<<"\" at this line."<<std::endl;
break; break;
} }
get_token();
if(this_token.type==__semi)
parse.push(this_token);
else
{
switch(this_token.type)
{
case __equal:
case __add_equal:
case __sub_equal:
case __mul_equal:
case __div_equal:
case __link_equal:
parse.push(this_token);
assignment_expr();
break;
default:
parse.push(this_token);
break;
}
}
return; return;
} }
void nasal_parser::number_begin_expr() void nasal_parser::number_begin_expr()
@ -771,6 +948,26 @@ void nasal_parser::compare_operator_expr()
} }
return; return;
} }
void nasal_parser::return_expr()
{
get_token();
switch(this_token.type)
{
case __semi:return;break;
case __number:number_begin_expr();break;
case __string:string_begin_expr();break;
case __id:identifier_begin_expr();break;
case __left_brace:hash_init_generator();break;
case __left_bracket:list_init_generator();break;
case __func:function_expr();break;
default:
++error;
std::cout<<">>[Error] line "<<this_token.line<<": incorrect token when return."<<std::endl;
return;
break;
}
return;
}
void nasal_parser::parse_main_work() void nasal_parser::parse_main_work()
{ {
error=0; error=0;
@ -806,9 +1003,9 @@ void nasal_parser::parse_main_work()
break; break;
case __semi:break; case __semi:break;
default: default:
std::cout<<">>[Error] line "<<this_token.line<<": "; std::cout<<">>[Error] line "<<this_token.line<<": \'";
print_token(this_token.type); print_token(this_token.type);
std::cout<<" in an incorrect place."<<std::endl; std::cout<<"\' in an incorrect place."<<std::endl;
++error; ++error;
break; break;
} }