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Nasal-Interpreter
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update

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Valk Richard Li 2020-01-23 15:53:01 +08:00 committed by GitHub
parent 9ced4f41c7
commit ef6632aa3f
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2 changed files with 32 additions and 43 deletions
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66
version2.0/nasal_enum.h
View File

@ -153,27 +153,29 @@ void print_parse_token(int type)
enum parse_error_type enum parse_error_type
{ {
parse_unknown_error, // unknown error parse_unknown_error=0, // unknown error
error_token_in_main, // when a token should not be the begin of a statement in main error_token_in_main, // when a token should not be the begin of a statement in main
error_token_in_block, // when a token should not be the begin of a statement in block error_token_in_block, // when a token should not be the begin of a statement in block
lack_semi, lack_semi,
lack_id, lack_id,
lack_left_curve, // lack left curve
lack_right_curve, // lack right curve
definition_lack_id, // lack identifier definition_lack_id, // lack identifier
definition_lack_equal, // lack '=' when not getting ';' definition_lack_equal, // lack '=' when not getting ';'
definition_wrong_type, // need identifier but get number or string
multi_definition_need_curve, // lack right curve when generating 'var (id,id,id)' multi_definition_need_curve, // lack right curve when generating 'var (id,id,id)'
multi_assignment_need_curve, // lack right curve when generating (scalar,scalar)=(scalar,scalar) multi_assignment_need_curve, // lack right curve when generating (scalar,scalar)=(scalar,scalar)
multi_assignment_need_equal, // lack '=' when generating (scalar,scalar)=(scalar,scalar) multi_assignment_need_equal, // lack '=' when generating (scalar,scalar)=(scalar,scalar)
error_begin_token_of_scalar, // in scalar_generate() error_begin_token_of_scalar, // in scalar_generate()
lack_left_curve, // lack left curve
lack_right_curve, // lack right curve
parameter_lack_part, // parameter lack a ')' or identifier parameter_lack_part, // parameter lack a ')' or identifier
parameter_lack_curve, // parameter lack a ',' or ')' parameter_lack_curve, // parameter lack a ',' or ')'
special_call_lack_id, special_call_func_lack_id,
special_call_lack_colon, special_call_func_lack_colon,
call_func_lack_comma, call_func_lack_comma,
call_hash_lack_id, // lack identifier when calling a hash call_hash_lack_id, // lack identifier when calling a hash
call_vector_lack_bracket, // lack ']' when calling a vector call_vector_lack_bracket, // lack ']' when calling a vector
@ -193,7 +195,7 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
switch(error_type) switch(error_type)
{ {
case parse_unknown_error: case parse_unknown_error:
std::cout<<error_info_head<<line<<": unknown parse error. error id: parse_unknown_error."<<std::endl;break; std::cout<<error_info_head<<line<<": unknown parse error.(token id: "<<error_token_type<<")."<<std::endl;break;
case error_token_in_main: case error_token_in_main:
std::cout<<error_info_head<<line<<": statements should not begin with \'"; std::cout<<error_info_head<<line<<": statements should not begin with \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
@ -204,24 +206,29 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' in block scope."<<std::endl; std::cout<<"\' in block scope."<<std::endl;
break; break;
case lack_semi: case lack_semi:
std::cout<<error_info_head<<line<<": expect a \';\' at the end of the statement."<<std::endl;break; std::cout<<error_info_head<<line<<": expect a \';\' at the end of the statement."<<std::endl;break;
case lack_id: case lack_id:
std::cout<<error_info_head<<line<<": expect an identifier here."<<std::endl;break; std::cout<<error_info_head<<line<<": expect an identifier here."<<std::endl;break;
case lack_left_curve:
std::cout<<error_info_head<<line<<": expect a \'(\' here."<<std::endl;break;
case lack_right_curve:
std::cout<<error_info_head<<line<<": expect a \')\' here."<<std::endl;break;
case definition_lack_id: case definition_lack_id:
std::cout<<error_info_head<<line<<": expect identifier(s) after \'var\'."<<std::endl;break; std::cout<<error_info_head<<line<<": expect identifier(s) after \'var\'."<<std::endl;break;
case definition_lack_equal: case definition_lack_equal:
std::cout<<error_info_head<<line<<": expect a \'=\' here but get \'"; std::cout<<error_info_head<<line<<": expect a \'=\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' when generating definition."<<std::endl;
break; break;
case definition_wrong_type:
std::cout<<error_info_head<<line<<": expect an identifier here but get other types."<<std::endl;break;
case multi_definition_need_curve: case multi_definition_need_curve:
std::cout<<error_info_head<<line<<": expect a \')\' here but get \'"; std::cout<<error_info_head<<line<<": expect a \')\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
case multi_assignment_need_curve: case multi_assignment_need_curve:
std::cout<<error_info_head<<line<<": expect a \')\' here but get \'"; std::cout<<error_info_head<<line<<": expect a \')\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
@ -232,28 +239,27 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
case error_begin_token_of_scalar: case error_begin_token_of_scalar:
std::cout<<error_info_head<<line<<": expect a scalar here but get \'"; std::cout<<error_info_head<<line<<": expect a scalar here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
case lack_left_curve:
std::cout<<error_info_head<<line<<": expect a \'(\' here."<<std::endl;break;
case lack_right_curve:
std::cout<<error_info_head<<line<<": expect a \')\' here."<<std::endl;break;
case parameter_lack_part: case parameter_lack_part:
std::cout<<error_info_head<<line<<": expect a \')\' or identifier here."<<std::endl;break; std::cout<<error_info_head<<line<<": expect a \')\' or identifier here when generating parameter_list."<<std::endl;break;
case parameter_lack_curve: case parameter_lack_curve:
std::cout<<error_info_head<<line<<": expect a \')\' or \',\' here."<<std::endl;break; std::cout<<error_info_head<<line<<": expect a \')\' or \',\' here when generating parameter_list."<<std::endl;break;
case special_call_lack_id:
case special_call_func_lack_id:
std::cout<<error_info_head<<line<<": expect an identifier here but get \'"; std::cout<<error_info_head<<line<<": expect an identifier here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' when calling functions."<<std::endl;
break; break;
case special_call_lack_colon: case special_call_func_lack_colon:
std::cout<<error_info_head<<line<<": expect an \':\' here but get \'"; std::cout<<error_info_head<<line<<": expect an \':\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' when calling functions."<<std::endl;
break; break;
case call_func_lack_comma: case call_func_lack_comma:
std::cout<<error_info_head<<line<<": expect a \',\' when calling a function but get \'"; std::cout<<error_info_head<<line<<": expect a \',\' when calling a function but get \'";
@ -267,6 +273,7 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
case vector_gen_lack_end: case vector_gen_lack_end:
std::cout<<error_info_head<<line<<": expect a \',\' or \')\' here but get \'"; std::cout<<error_info_head<<line<<": expect a \',\' or \')\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
@ -287,31 +294,16 @@ void print_parse_error(int error_type,int line,int error_token_type=__stack_end)
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
case ternary_operator_lack_colon: case ternary_operator_lack_colon:
std::cout<<error_info_head<<line<<": expect a \':\' here but get \'"; std::cout<<error_info_head<<line<<": expect a \':\' here but get \'";
print_parse_token(error_token_type); print_parse_token(error_token_type);
std::cout<<"\' ."<<std::endl; std::cout<<"\' ."<<std::endl;
break; break;
default: default:
std::cout<<error_info_head<<line<<": unknown parse error. error id: other_type."<<std::endl;break; std::cout<<error_info_head<<line<<": unknown parse error.(token id: "<<error_token_type<<")."<<std::endl;break;
} }
return; return;
} }
// statement_type is used to mark a statement that parser has generated
// with this parser will check if this statement has ';' at its end
enum statement_type
{
stat_null,
stat_normal_definition=1,
stat_assignment,
stat_calculation,
stat_function_definition,
stat_loop,
stat_choose,
stat_return,
stat_continue,
stat_break,
};
#endif #endif

9
version2.0/nasal_parse.h
View File

@ -4,7 +4,6 @@
class nasal_parse class nasal_parse
{ {
private: private:
int statement_generate_state;
std::stack<token> parse_token_stream; std::stack<token> parse_token_stream;
std::stack<token> checked_tokens; std::stack<token> checked_tokens;
token this_token; token this_token;
@ -278,8 +277,6 @@ bool nasal_parse::check_var_in_curve()
void nasal_parse::main_generate() void nasal_parse::main_generate()
{ {
statement_generate_state=stat_null;
// initialize state
error=0; error=0;
// initialize error // initialize error
root.set_clear(); root.set_clear();
@ -814,7 +811,7 @@ abstract_syntax_tree nasal_parse::scalar_generate()
if(this_token.type!=__id) if(this_token.type!=__id)
{ {
++error; ++error;
print_parse_error(special_call_lack_id,this_token.line,this_token.type); print_parse_error(special_call_func_lack_id,this_token.line,this_token.type);
break; break;
} }
id_node.set_node_line(this_token.line); id_node.set_node_line(this_token.line);
@ -825,7 +822,7 @@ abstract_syntax_tree nasal_parse::scalar_generate()
if(this_token.type!=__colon) if(this_token.type!=__colon)
{ {
++error; ++error;
print_parse_error(special_call_lack_colon,this_token.line,this_token.type); print_parse_error(special_call_func_lack_colon,this_token.line,this_token.type);
break; break;
} }
special_para_node.add_children(calculation()); special_para_node.add_children(calculation());
@ -1247,7 +1244,7 @@ abstract_syntax_tree nasal_parse::definition()
{ {
this->push_token(); this->push_token();
++error; ++error;
print_parse_error(definition_wrong_type,this_token.line,this_token.type); print_parse_error(definition_lack_id,this_token.line,this_token.type);
break; break;
} }
else else