floraachy/Nasal-Interpreter
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This commit is contained in:
ValKmjolnir
2021-10-16 23:36:43 +08:00
parent d4a9412947
commit 1bfa7d2638
5 changed files with 114 additions and 117 deletions
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nasal_import.h
+18 -19
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@@ -5,10 +5,9 @@ class nasal_import
{
private:
uint32_t error;
nasal_lexer import_lex;
nasal_parse import_par;
nasal_ast import_ast;
std::vector<std::string> file_table;
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&);
@@ -18,7 +17,7 @@ private:
public:
uint32_t err(){return error;}
void link(nasal_parse&,const std::string&);
const std::vector<std::string>& get_file() const {return file_table;}
const std::vector<std::string>& get_file() const {return files;}
};
void nasal_import::die(const std::string& file,const char* stage)
@@ -38,14 +37,14 @@ only this kind of node can be recognized as 'import':
*/
if(node.type()!=ast_call)
return false;
const std::vector<nasal_ast>& ref_vec=node.child();
if(ref_vec.size()!=2)
const std::vector<nasal_ast>& vec=node.child();
if(vec.size()!=2)
return false;
if(ref_vec[0].str()!="import")
if(vec[0].str()!="import")
return false;
if(ref_vec[1].type()!=ast_callf)
if(vec[1].type()!=ast_callf)
return false;
if(ref_vec[1].child().size()!=1 || ref_vec[1].child()[0].type()!=ast_str)
if(vec[1].child().size()!=1 || vec[1].child()[0].type()!=ast_str)
return false;
return true;
}
@@ -53,10 +52,10 @@ only this kind of node can be recognized as 'import':
bool nasal_import::check_exist(const std::string& file)
{
// avoid importing the same file
for(auto& fname:file_table)
for(auto& fname:files)
if(file==fname)
return true;
file_table.push_back(file);
files.push_back(file);
return false;
}
@@ -78,21 +77,21 @@ nasal_ast nasal_import::file_import(nasal_ast& node)
return {0,ast_root};
// start importing...
import_lex.scan(filename);
if(import_lex.err())
lex.scan(filename);
if(lex.err())
{
die(filename,"lexer");
return {0,ast_root};
}
import_par.compile(import_lex);
if(import_par.err())
par.compile(lex);
if(par.err())
{
die(filename,"parser");
return {0,ast_root};
}
nasal_ast tmp=std::move(import_par.ast());
nasal_ast tmp=std::move(par.ast());
// check if tmp has 'import'
return load(tmp,file_table.size()-1);
return load(tmp,files.size()-1);
}
nasal_ast nasal_import::load(nasal_ast& root,uint16_t fileindex)
@@ -113,7 +112,7 @@ void nasal_import::link(nasal_parse& parse,const std::string& self)
{
// initializing
error=0;
file_table={self};
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);