finished nasal parse
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Valk Richard Li
GitHub
parent
772cf253da
commit
f05097666d
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@ -29,10 +29,12 @@ class nasal_parse
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int get_error();
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abstract_syntax_tree& get_root();
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// check '(' confliction
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bool check_multi_assignment();// multi_call_id = multi_scalar
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bool check_multi_scalar();
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bool check_var_in_curve(); // multi_definition
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// abstract_syntax_tree generation
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bool check_multi_assignment();
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bool check_comma_in_curve();
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bool check_var_in_curve();
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void main_generate();
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abstract_syntax_tree statements_block_generate();
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abstract_syntax_tree multi_scalar_assignment();
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@ -174,34 +176,66 @@ bool nasal_parse::check_multi_assignment()
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++cnt;
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if(this_token.type==__id)
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{
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}
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return ret;
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}
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bool nasal_parse::check_comma_in_curve()
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{
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// when generating multi_assignment
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// only one pair of curves are alowed
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// if there are too many pairs
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// then a parse error occurs.
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bool ret=false;
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int left_curve_cnt=0;
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int cnt=0;
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while(this_token.type!=__right_curve)
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int curve_cnt=0;
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int bracket_cnt=0;
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int brace_cnt=0;
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while(1)
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{
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++cnt;
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this->get_token();
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if(this_token.type==__left_curve)
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++left_curve_cnt;
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if(left_curve_cnt>1)
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break;
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if(this_token.type==__comma)
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++cnt;
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if(this_token.type==__left_curve) ++curve_cnt;
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if(this_token.type==__left_bracket) ++bracket_cnt;
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if(this_token.type==__left_brace) ++brace_cnt;
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if(this_token.type==__right_curve) --curve_cnt;
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if(this_token.type==__right_bracket)--bracket_cnt;
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if(this_token.type==__right_brace) --brace_cnt;
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if(!curve_cnt && !bracket_cnt && !brace_cnt && this_token.type==__comma)
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{
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ret=true;
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break;
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}
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if(!curve_cnt && !bracket_cnt && brace_cnt<0)
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break;
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if((!parse_token_stream.empty() && parse_token_stream.top().type==__stack_end) || (this_token.type==__semi))
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break;
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}
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}
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for(int i=0;i<cnt;++i)
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this->push_token();
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return ret;
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}
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bool nasal_parse::check_multi_scalar()
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{
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bool ret=false;
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int cnt=0;
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this->get_token();
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++cnt;// get '('
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int curve_cnt=0;
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int bracket_cnt=0;
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int brace_cnt=0;
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while(1)
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{
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this->get_token();
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++cnt;
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if(this_token.type==__left_curve) ++curve_cnt;
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if(this_token.type==__left_bracket) ++bracket_cnt;
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if(this_token.type==__left_brace) ++brace_cnt;
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if(this_token.type==__right_curve) --curve_cnt;
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if(this_token.type==__right_bracket)--bracket_cnt;
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if(this_token.type==__right_brace) --brace_cnt;
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if(!curve_cnt && !bracket_cnt && !brace_cnt && this_token.type==__comma)
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{
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ret=true;
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break;
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}
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if(!curve_cnt && !bracket_cnt && brace_cnt<0)
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break;
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if((!parse_token_stream.empty() && parse_token_stream.top().type==__stack_end) || (this_token.type==__semi))
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break;
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}
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for(int i=0;i<cnt;++i)
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this->push_token();
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@ -250,7 +284,7 @@ void nasal_parse::main_generate()
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this->push_token();
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if(check_var_in_curve())
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root.add_children(definition());
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else if(check_comma_in_curve())
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else if(check_multi_assignment())
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root.add_children(multi_scalar_assignment());
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else
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root.add_children(calculation());
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@ -306,7 +340,7 @@ abstract_syntax_tree nasal_parse::statements_block_generate()
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this->push_token();
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if(check_var_in_curve())
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block_node.add_children(definition());
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else if(check_comma_in_curve())
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else if(check_multi_assignment())
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block_node.add_children(multi_scalar_assignment());
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else
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block_node.add_children(calculation());
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@ -366,7 +400,7 @@ abstract_syntax_tree nasal_parse::statements_block_generate()
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this->push_token();
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if(check_var_in_curve())
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block_node.add_children(definition());
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else if(check_comma_in_curve())
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else if(check_multi_assignment())
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block_node.add_children(multi_scalar_assignment());
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else
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block_node.add_children(calculation());
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@ -447,7 +481,7 @@ abstract_syntax_tree nasal_parse::multi_scalar_assignment()
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else
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{
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this->push_token();
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if(check_comma_in_curve())
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if(check_multi_scalar())
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{
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this->get_token();// get '('
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back_multi_scalar_node.set_node_line(this_token.line);
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@ -1109,11 +1143,11 @@ abstract_syntax_tree nasal_parse::definition()
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multi_identifier.add_children(id_node);
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}
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this->get_token();
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if((this_token.type!=__semi) && (this_token.type!=__right_curve))
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if((this_token.type!=__comma) && (this_token.type!=__right_curve))
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{
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this->push_token();
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++error;
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print_parse_error(multi_definition_need_curve,this_token.line);
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print_parse_error(multi_definition_need_curve,this_token.line,this_token.type);
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break;
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}
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}
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@ -1121,7 +1155,35 @@ abstract_syntax_tree nasal_parse::definition()
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this->get_token();
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if(this_token.type==__equal)// (var id,id,id)=
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{
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;
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this->get_token();
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if(this_token.type==__left_curve)
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{
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this->push_token();
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if(check_multi_scalar())
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{
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abstract_syntax_tree multi_scalar_node;
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this->get_token();// get '('
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multi_scalar_node.set_node_line(this_token.line);
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multi_scalar_node.set_node_type(__multi_scalar);
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while(this_token.type!=__right_curve)
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{
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multi_scalar_node.add_children(scalar_generate());
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this->get_token();
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if((this_token.type!=__comma) && (this_token.type!=__right_curve))
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{
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++error;
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print_parse_error(multi_definition_need_curve,this_token.line,this_token.type);
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break;
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}
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}
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definition_node.add_children(multi_scalar_node);
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}
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}
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else
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{
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this->push_token();
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definition_node.add_children(calculation());
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}
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}
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else
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{
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@ -1141,9 +1203,7 @@ abstract_syntax_tree nasal_parse::definition()
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new_var_identifier.set_var_name(this_token.str);
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definition_node.add_children(new_var_identifier);
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this->get_token();
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if(this_token.type==__semi)
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this->push_token();// var id
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else if(this_token.type==__equal)
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if(this_token.type==__equal)
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definition_node.add_children(calculation());// var id = scalar
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else
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{
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@ -1176,11 +1236,11 @@ abstract_syntax_tree nasal_parse::definition()
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multi_identifier.add_children(id_node);
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}
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this->get_token();
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if(this_token.type!=__semi && this_token.type!=__right_curve)
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if((this_token.type!=__comma) && (this_token.type!=__right_curve))
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{
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this->push_token();
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++error;
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print_parse_error(multi_definition_need_curve,this_token.line);
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print_parse_error(multi_definition_need_curve,this_token.line,this_token.type);
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break;
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}
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}
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@ -1188,7 +1248,35 @@ abstract_syntax_tree nasal_parse::definition()
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this->get_token();
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if(this_token.type==__equal)// var (id,id,id)=
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{
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;
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this->get_token();
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if(this_token.type==__left_curve)
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{
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this->push_token();
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if(check_multi_scalar())
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{
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abstract_syntax_tree multi_scalar_node;
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this->get_token();// get '('
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multi_scalar_node.set_node_line(this_token.line);
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multi_scalar_node.set_node_type(__multi_scalar);
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while(this_token.type!=__right_curve)
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{
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multi_scalar_node.add_children(scalar_generate());
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this->get_token();
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if((this_token.type!=__comma) && (this_token.type!=__right_curve))
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{
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++error;
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print_parse_error(multi_definition_need_curve,this_token.line,this_token.type);
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break;
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}
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}
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definition_node.add_children(multi_scalar_node);
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}
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}
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else
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{
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this->push_token();
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definition_node.add_children(calculation());
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}
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}
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else
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{
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