mirror of
https://github.com/ValKmjolnir/Nasal-Interpreter.git
synced 2026-07-27 05:18:46 +08:00
update
This commit is contained in:
Valk Richard Li
+170
-9
@@ -7,27 +7,64 @@ class nasal_parse
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std::stack<token> parse_token_stream;
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std::stack<token> checked_tokens;
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token this_token;
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int error;
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int error;
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abstract_syntax_tree root;
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enum parse_error_type
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{
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parse_unknown_error=0, // unknown error
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error_token_in_main, // when a token should not be the begin of a statement in main
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error_token_in_block, // when a token should not be the begin of a statement in block
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lack_semi,
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lack_id,
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lack_left_curve,
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lack_right_curve,
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lack_right_brace,
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definition_lack_id, // lack identifier
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definition_lack_equal, // lack '=' when not getting ';'
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assignment_begin_error, // assignment begins with more than one identifier_call
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multi_definition_need_curve, // lack right curve when generating 'var (id,id,id)'
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multi_assignment_need_curve, // lack right curve when generating (scalar,scalar)=(scalar,scalar)
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multi_assignment_need_equal, // lack '=' when generating (scalar,scalar)=(scalar,scalar)
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error_begin_token_of_scalar, // in scalar_generate()
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default_dynamic_parameter, // default parameter should not be dynamic
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parameter_lack_part, // parameter lack a ')' or identifier
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parameter_lack_curve, // parameter lack a ',' or ')'
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special_call_func_lack_id,
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special_call_func_lack_colon,
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call_func_lack_comma, // lack comma when giving parameters to a function
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call_hash_lack_id, // lack identifier when calling a hash
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call_vector_wrong_comma, // wrong use of comma like this: id[0,4:6,7,] (the last comma is incorrect here)
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call_vector_lack_bracket, // lack ']' when calling a vector
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call_vector_wrong_token, // get wrong token when calling a vector
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vector_gen_lack_end, // lack ',' or ')' when generating a vector
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hash_gen_lack_id, // lack identifier or string when generating a hash
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hash_gen_lack_colon, // lack ':' when generating a hash
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hash_gen_lack_end, // lack ',' or '}' when generating a hash
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ternary_operator_lack_colon, // lack ':'
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};
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void print_parse_error(int,int,int);
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// most important function of parser
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// these two functions are used to get and push token
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// by using them,parser can generate ast
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void get_token();
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void push_token();
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// block statements generation
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abstract_syntax_tree block_generate();
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// check ';'
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void check_semi();
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// check '(' confliction
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bool check_multi_assignment();// check multi_call_id '=' multi_scalar
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bool check_multi_scalar(); // check multi_scalar
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bool check_var_in_curve(); // check multi_definition: (var id,id,id)
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bool check_function_end(abstract_syntax_tree&); // check end of definition or '=' is a function
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/*
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calculation() will get elements generated by and_calculation()
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and_calculation() will get elements generated by or_calculation()
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@@ -48,14 +85,13 @@ class nasal_parse
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abstract_syntax_tree additive_calculation();
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abstract_syntax_tree multive_calculation();
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abstract_syntax_tree scalar_generate();
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// normal data type generation
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abstract_syntax_tree hash_generate();
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abstract_syntax_tree vector_generate();
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abstract_syntax_tree function_generate();
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// return_expr() generates ebnf: <return> [<calculation>] ';'
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abstract_syntax_tree return_expr();
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// normal expressions
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abstract_syntax_tree multi_scalar_assignment();
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abstract_syntax_tree definition();
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abstract_syntax_tree loop_expr();
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@@ -74,9 +110,8 @@ class nasal_parse
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}
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void print_detail_token();
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void get_token_list(std::list<token>&);
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int get_error();
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int get_error();
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abstract_syntax_tree& get_root();
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// abstract_syntax_tree generation
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// main process of parser
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void main_generate();
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@@ -114,6 +149,8 @@ void nasal_parse::print_detail_token()
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void nasal_parse::get_token_list(std::list<token>& detail_token_stream)
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{
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// get detail_token_stream from lexer
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// clear the parse_token_stream and checked_tokens list
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while(!parse_token_stream.empty())
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parse_token_stream.pop();
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while(!checked_tokens.empty())
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@@ -142,6 +179,130 @@ void nasal_parse::get_token_list(std::list<token>& detail_token_stream)
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return;
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}
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void nasal_parse::print_parse_error(int error_type,int line,int error_token_type=__stack_end)
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{
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std::string error_info_head=">> [Parse] line ";
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switch(error_type)
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{
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case parse_unknown_error:
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std::cout<<error_info_head<<line<<": unknown parse error.(token id: "<<error_token_type<<")."<<std::endl;break;
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case error_token_in_main:
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std::cout<<error_info_head<<line<<": statements should not begin with \'";
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print_parse_token(error_token_type);
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std::cout<<"\' in main scope."<<std::endl;
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break;
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case error_token_in_block:
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std::cout<<error_info_head<<line<<": statements should not begin with \'";
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print_parse_token(error_token_type);
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std::cout<<"\' in block scope."<<std::endl;
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break;
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case lack_semi:
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std::cout<<error_info_head<<line<<": expect a \';\' at the end of the statement."<<std::endl;break;
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case lack_id:
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std::cout<<error_info_head<<line<<": expect an identifier here."<<std::endl;break;
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case lack_left_curve:
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std::cout<<error_info_head<<line<<": expect a \'(\' here."<<std::endl;break;
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case lack_right_curve:
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std::cout<<error_info_head<<line<<": expect a \')\' here."<<std::endl;break;
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case lack_right_brace:
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std::cout<<error_info_head<<line<<": expect a \'}\' here."<<std::endl;break;
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case definition_lack_id:
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std::cout<<error_info_head<<line<<": expect identifier(s) after \'var\'."<<std::endl;break;
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case definition_lack_equal:
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std::cout<<error_info_head<<line<<": expect a \'=\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' when generating definition."<<std::endl;
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break;
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case assignment_begin_error:
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std::cout<<error_info_head<<line<<": assignment should begin with one identifier_call."<<std::endl;
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break;
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case multi_definition_need_curve:
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std::cout<<error_info_head<<line<<": expect a \')\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case multi_assignment_need_curve:
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std::cout<<error_info_head<<line<<": expect a \')\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case multi_assignment_need_equal:
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std::cout<<error_info_head<<line<<": expect a \'=\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case error_begin_token_of_scalar:
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std::cout<<error_info_head<<line<<": expect a scalar here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case default_dynamic_parameter:
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std::cout<<error_info_head<<line<<": dynamic parameter should not have a default value."<<std::endl;break;
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case parameter_lack_part:
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std::cout<<error_info_head<<line<<": expect a \')\' or identifier here when generating parameter_list."<<std::endl;break;
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case parameter_lack_curve:
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std::cout<<error_info_head<<line<<": expect a \')\' or \',\' here when generating parameter_list."<<std::endl;break;
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case special_call_func_lack_id:
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std::cout<<error_info_head<<line<<": expect an identifier here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' when calling functions."<<std::endl;
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break;
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case special_call_func_lack_colon:
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std::cout<<error_info_head<<line<<": expect an \':\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' when calling functions."<<std::endl;
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break;
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case call_func_lack_comma:
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std::cout<<error_info_head<<line<<": expect a \',\' when calling a function but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case call_hash_lack_id:
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std::cout<<error_info_head<<line<<": expect an identifier after \'.\' ."<<std::endl;break;
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case call_vector_wrong_comma:
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std::cout<<error_info_head<<line<<": expect a scalar after \',\' but get \']\' ."<<std::endl;
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break;
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case call_vector_lack_bracket:
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std::cout<<error_info_head<<line<<": expect a \']\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case call_vector_wrong_token:
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std::cout<<error_info_head<<line<<": expect \':\' or ',' or ']' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case vector_gen_lack_end:
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std::cout<<error_info_head<<line<<": expect a \',\' or \')\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case hash_gen_lack_id:
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std::cout<<error_info_head<<line<<": expect an identifier or string here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case hash_gen_lack_colon:
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std::cout<<error_info_head<<line<<": expect a \':\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case hash_gen_lack_end:
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std::cout<<error_info_head<<line<<": expect a \',\' or \'}\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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case ternary_operator_lack_colon:
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std::cout<<error_info_head<<line<<": expect a \':\' here but get \'";
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print_parse_token(error_token_type);
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std::cout<<"\' ."<<std::endl;
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break;
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default:
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std::cout<<error_info_head<<line<<": unknown parse error.(token id: "<<error_token_type<<")."<<std::endl;break;
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}
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return;
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}
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void nasal_parse::get_token()
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{
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if(!parse_token_stream.empty())
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