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Nasal-Interpreter
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update

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Valk Richard Li 2019-12-27 21:42:41 +08:00 committed by GitHub
parent 7318a264c5
commit a4eefdc191
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 76 additions and 7 deletions
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44
version2.0/nasal_parse.h
View File

@ -24,6 +24,7 @@ class nasal_parse
abstract_syntax_tree number_expr();
abstract_syntax_tree string_expr();
abstract_syntax_tree nil_expr();
abstract_syntax_tree var_outside_definition();
};
void nasal_parse::print_detail_token()
@ -98,6 +99,7 @@ void nasal_parse::push_token()
if(!checked_tokens.empty())
{
parse_token_stream.push(checked_tokens.top());
this_token=checked_token.top();
checked_tokens.pop();
}
else
@ -125,26 +127,27 @@ void nasal_parse::main_generate()
while(!parse_token_stream.empty())
{
get_token();
this->get_token();
switch(this_token.type)
{
case __var:break;
case __var:this->push_token();root.get_children().push_back(var_outside_definition());break;
case __nor_operator:
case __sub_operator:
case __number:
case __string:
case __nil:
case __id:break;
case __left_curve:break;
case __left_bracket:break;
case __left_brace:break;
case __func:break;
case __if:break;
case __while:
case __for:
case __foreach:
case __forindex:break;
case __semi:break;
default:
++error;
std::cout<<">>[Parse-error] line "<<this_token.line<<": error token \'";
print_parse_token(this_token.type);
std::cout<<"\' in main scope."<<std::endl;
default:++error;print_parse_error(error_token_in_main,this_token.line,this_token.type);
}
}
std::cout<<">>[Parse] complete generation. "<<error<<" error(s), "<<warning<<" warning(s)."<<std::endl;
@ -154,6 +157,7 @@ void nasal_parse::main_generate()
abstract_syntax_tree nasal_parse::number_expr()
{
abstract_syntax_tree node;
this->get_token();
node.set_line(this_token.line);
node.set_type(__number);
node.set_number(this_token.str);
@ -163,6 +167,7 @@ abstract_syntax_tree nasal_parse::number_expr()
abstract_syntax_tree nasal_parse::string_expr()
{
abstract_syntax_tree node;
this->get_token();
node.set_line(this_token.line);
node.set_type(__string);
node.set_string(this_token.str);
@ -172,9 +177,34 @@ abstract_syntax_tree nasal_parse::string_expr()
abstract_syntax_tree nasal_parse::nil_expr()
{
abstract_syntax_tree node;
this->get_token();
node.set_line(this_token.line);
node.set_type(__nil);
return node;
}
abstract_syntax_tree nasal_parse::var_outside_definition()
{
abstract_syntax_tree definition_node;
this->get_token();
if(this_token.type!=__var)
{
++error;
print_parse_error(definition_lack_var,this_token.line);
}
this->get_token();
if(this_token.type==__id)
{
}
else if(this_token.type==__left_curve)
{
}
else
{
++error;
print_parse_error(definition_lack_id,this_token.line);
}
return definition_node;
}
#endif

39
version2.0/parse.bnf Normal file
View File

@ -0,0 +1,39 @@
# <> must choose
# [] can choose
# {} can repeat 0 to infinite time(s)
# | or
# ::= is defined as
<number> ::= <token_type_number>
<string> ::= <token_type_string>
<id> ::= <token_type_identifier>
<dynamic_id> ::= <token_type_dynamic_id>
<vector> ::= <[> { <scalar> <,> } <]>
<hash> ::= <{> { ( <id> ) | ( <string> ) <:> <scalar> <,> } <}>
<function> ::=<func> [ <(> { ( <id> [ <=> <scalar> ] ) | ( <dynamic_id> ) <,> } <)> ] ( <statement> ) | ( <{> { <statement> <;> } <}> )
<calculation> ::=
<definition> ::=
<var> <id> <=> <scalar>
| <var> <(> <id> { <,> <id> } <)> <=> <scalar>
| <(> <var> <id> { <,> <id> } <) <=> <scalar>
<assignment> ::=
<if-else> ::=
<if> <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
{ ( <elsif> ) | ( <else> <if> ) } <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
[<else> ( <statement> ) | ( <{> { <statement> <;> } <}> )
<loop> ::=
<for> <(> <;> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <foreach> <(> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <forindex> <(> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <while> <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
<statement> ::=
<definition>
| <assignment>
| <if-else>
| <loop>
| <scalar>