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Nasal-Interpreter
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Valk Richard Li 2019-10-11 22:26:40 +08:00 committed by GitHub
parent a5acf83ae2
commit 6bb206d37d
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2 changed files with 49 additions and 20 deletions
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18
version1.0/ast.h
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@ -121,6 +121,24 @@ class abstract_syntax_tree
statement_list.push_back(statement_head);
return;
}
// for return expr
void set_node_to_ret(abstract_syntax_tree child)
{
ast_node_type=__return;
children.push_back(child);
return;
}
// for loop
void set_node_to_loop()
{
ast_node_type=__loop;
return;
}
void set_node_to_continue_break(const int type)
{
ast_node_type=type;
return;
}
// for sub-tree node operator
void set_two_operator(const int operator_type,abstract_syntax_tree f_child,abstract_syntax_tree s_child)
{

51
version1.0/ast_generator.h
View File

@ -71,6 +71,7 @@ class generator
abstract_syntax_tree definition_expr();
abstract_syntax_tree assignment_expr();
abstract_syntax_tree loop_expr();
abstract_syntax_tree continue_break_expr();
bool else_if_check();
abstract_syntax_tree if_else_expr();
abstract_syntax_tree add_sub_operator_expr();
@ -90,22 +91,26 @@ void generator::check_semi_at_end()
}
abstract_syntax_tree generator::return_expr()
{
abstract_syntax_tree node;
get_token();
switch(this_token.type)
{
case __number:number_begin_expr();break;
case __string:string_begin_expr();break;
case __id:identifier_begin_expr();break;
case __func:function_generate_expr();break;
case __left_bracket:list_generate_expr();break;
case __left_brace:hash_generate_expr();break;
case __semi:parse.push(this_token);break;
case __number:node.set_node_to_ret(number_begin_expr());;break;
case __string:node.set_node_to_ret(string_begin_expr());;break;
case __id:node.set_node_to_ret(identifier_begin_expr());;break;
case __func:node.set_node_to_ret(function_generate_expr());;break;
case __left_bracket:node.set_node_to_ret(list_generate_expr());;break;
case __left_brace:node.set_node_to_ret(hash_generate_expr());;break;
case __semi:parse.push(this_token);node.set_node_to_ret(node);break;
default:break;
}
return;
return node;
}
abstract_syntax_tree generator::statements_block()
{
abstract_syntax_tree node;
node.set_block();
get_token();
get_token();
while(this_token.type!=__right_brace)
@ -113,41 +118,41 @@ abstract_syntax_tree generator::statements_block()
token t;
switch(this_token.type)
{
case __var:definition_expr();check_semi_at_end();break;
case __id:identifier_begin_expr();check_semi_at_end();break;
case __number:number_begin_expr();check_semi_at_end();break;
case __string:string_begin_expr();check_semi_at_end();break;
case __if:parse.push(this_token);if_else_expr();break;
case __var:node.add_statement(definition_expr());check_semi_at_end();break;
case __id:node.add_statement(identifier_begin_expr());check_semi_at_end();break;
case __number:node.add_statement(number_begin_expr());check_semi_at_end();break;
case __string:node.add_statement(string_begin_expr());check_semi_at_end();break;
case __if:parse.push(this_token);node.add_statement(if_else_expr());break;
case __left_curve:
t=this_token;
get_token();
if(this_token.type==__var)
{
parse.push(t);
definition_expr();
node.add_statement(definition_expr());
}
else
{
in_curve_calc_expr();
node.add_statement(in_curve_calc_expr());
}
check_semi_at_end();
break;
case __add_operator:
case __sub_operator:
case __nor_operator:one_operator_expr();break;
case __nor_operator:node.add_statement(one_operator_expr());break;
case __while:
case __for:
case __foreach:
case __forindex:parse.push(this_token);loop_expr();break;
case __forindex:parse.push(this_token);node.add_statement(loop_expr());break;
case __continue:
case __break:check_semi_at_end();break;
case __break:node.add_statement(continue_break_expr());check_semi_at_end();break;
case __semi:break;
case __return:return_expr();check_semi_at_end();break;
case __return:node.add_statement(return_expr());check_semi_at_end();break;
default:break;
}
get_token();
}
return;
return node;
}
abstract_syntax_tree generator::function_generate_expr()
{
@ -705,6 +710,12 @@ abstract_syntax_tree generator::loop_expr()
}
return;
}
abstract_syntax_tree generator::continue_break_expr()
{
abstract_syntax_tree node;
node.set_node_to_continue_break(this_token.type);
return node;
}
abstract_syntax_tree generator::add_sub_operator_expr()
{
get_token();