99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#ifndef __NASAL_IMPORT_H__
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#define __NASAL_IMPORT_H__
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class nasal_import
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{
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private:
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nasal_err& nerr;
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std::vector<std::string> files;
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bool check_import(const nasal_ast&);
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bool check_exist(const std::string&);
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void linker(nasal_ast&,nasal_ast&&);
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nasal_ast file_import(nasal_ast&);
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nasal_ast load(nasal_ast&,uint16_t);
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public:
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nasal_import(nasal_err& e):nerr(e){}
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void link(nasal_parse&,const std::string&);
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const std::vector<std::string>& get_file() const {return files;}
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};
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bool nasal_import::check_import(const nasal_ast& node)
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{
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/*
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only this kind of node can be recognized as 'import':
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call
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|_id:import
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|_call_func
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|_string:'filename'
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*/
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return (
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node.type()==ast_call &&
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node.size()==2 &&
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node[0].str()=="import" &&
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node[1].type()==ast_callf &&
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node[1].size()==1 &&
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node[1][0].type()==ast_str
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);
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}
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bool nasal_import::check_exist(const std::string& file)
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{
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// avoid importing the same file
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for(auto& fname:files)
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if(file==fname)
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return true;
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files.push_back(file);
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return false;
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}
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void nasal_import::linker(nasal_ast& root,nasal_ast&& add_root)
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{
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// add children of add_root to the back of root
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for(auto& i:add_root.child())
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root.add(std::move(i));
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}
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nasal_ast nasal_import::file_import(nasal_ast& node)
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{
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nasal_lexer lex(nerr);
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nasal_parse par(nerr);
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// get filename and set node to ast_null
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std::string filename=node[1][0].str();
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node.clear();
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// avoid infinite loading loop
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if(check_exist(filename))
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return {0,ast_root};
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// start importing...
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lex.scan(filename);
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par.compile(lex);
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nasal_ast tmp=std::move(par.ast());
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// check if tmp has 'import'
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return load(tmp,files.size()-1);
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}
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nasal_ast nasal_import::load(nasal_ast& root,uint16_t fileindex)
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{
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nasal_ast new_root(0,ast_root);
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for(auto& i:root.child())
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if(check_import(i))
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linker(new_root,file_import(i));
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// add root to the back of new_root
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nasal_ast file_head(0,ast_file);
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file_head.set_num(fileindex);
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new_root.add(std::move(file_head));
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linker(new_root,std::move(root));
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return new_root;
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}
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void nasal_import::link(nasal_parse& parse,const std::string& self)
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{
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// initializing
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files={self};
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// scan root and import files,then generate a new ast and return to import_ast
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// the main file's index is 0
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parse.ast()=load(parse.ast(),0);
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}
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#endif |