mirror of
https://github.com/ValKmjolnir/Nasal-Interpreter.git
synced 2026-07-21 18:38:44 +08:00
ValKmjolnir
120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
#ifndef __NASAL_IMPORT_H__
|
|
#define __NASAL_IMPORT_H__
|
|
|
|
class nasal_import
|
|
{
|
|
private:
|
|
uint32_t error;
|
|
nasal_lexer lex;
|
|
nasal_parse par;
|
|
std::vector<std::string> files;
|
|
void die(const std::string&,const char*);
|
|
bool check_import(const nasal_ast&);
|
|
bool check_exist(const std::string&);
|
|
void linker(nasal_ast&,nasal_ast&&);
|
|
nasal_ast file_import(nasal_ast&);
|
|
nasal_ast load(nasal_ast&,uint16_t);
|
|
public:
|
|
uint32_t err(){return error;}
|
|
void link(nasal_parse&,const std::string&);
|
|
const std::vector<std::string>& get_file() const {return files;}
|
|
};
|
|
|
|
void nasal_import::die(const std::string& file,const char* stage)
|
|
{
|
|
++error;
|
|
std::cout<<"[import] in <\""<<file<<"\">: error(s) occurred in "<<stage<<".\n";
|
|
}
|
|
|
|
bool nasal_import::check_import(const nasal_ast& node)
|
|
{
|
|
/*
|
|
only this kind of node can be recognized as 'import':
|
|
call
|
|
id:import
|
|
call_func
|
|
string:'filename'
|
|
*/
|
|
if(node.type()!=ast_call)
|
|
return false;
|
|
if(node.size()!=2)
|
|
return false;
|
|
if(node[0].str()!="import")
|
|
return false;
|
|
if(node[1].type()!=ast_callf)
|
|
return false;
|
|
if(node[1].size()!=1 || node[1][0].type()!=ast_str)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool nasal_import::check_exist(const std::string& file)
|
|
{
|
|
// avoid importing the same file
|
|
for(auto& fname:files)
|
|
if(file==fname)
|
|
return true;
|
|
files.push_back(file);
|
|
return false;
|
|
}
|
|
|
|
void nasal_import::linker(nasal_ast& root,nasal_ast&& add_root)
|
|
{
|
|
// add children of add_root to the back of root
|
|
for(auto& i:add_root.child())
|
|
root.add(std::move(i));
|
|
}
|
|
|
|
nasal_ast nasal_import::file_import(nasal_ast& node)
|
|
{
|
|
// get filename and set node to ast_null
|
|
std::string filename=node[1][0].str();
|
|
node.clear();
|
|
|
|
// avoid infinite loading loop
|
|
if(check_exist(filename))
|
|
return {0,ast_root};
|
|
|
|
// start importing...
|
|
lex.scan(filename);
|
|
if(lex.err())
|
|
{
|
|
die(filename,"lexer");
|
|
return {0,ast_root};
|
|
}
|
|
par.compile(lex);
|
|
if(par.err())
|
|
{
|
|
die(filename,"parser");
|
|
return {0,ast_root};
|
|
}
|
|
nasal_ast tmp=std::move(par.ast());
|
|
// check if tmp has 'import'
|
|
return load(tmp,files.size()-1);
|
|
}
|
|
|
|
nasal_ast nasal_import::load(nasal_ast& root,uint16_t fileindex)
|
|
{
|
|
nasal_ast new_root(0,ast_root);
|
|
for(auto& i:root.child())
|
|
if(check_import(i))
|
|
linker(new_root,file_import(i));
|
|
// add root to the back of new_root
|
|
nasal_ast file_head(0,ast_file);
|
|
file_head.set_num(fileindex);
|
|
new_root.add(std::move(file_head));
|
|
linker(new_root,std::move(root));
|
|
return new_root;
|
|
}
|
|
|
|
void nasal_import::link(nasal_parse& parse,const std::string& self)
|
|
{
|
|
// initializing
|
|
error=0;
|
|
files={self};
|
|
// scan root and import files,then generate a new ast and return to import_ast
|
|
// the main file's index is 0
|
|
parse.ast()=load(parse.ast(),0);
|
|
}
|
|
|
|
#endif |