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#include <iostream>
#include <fstream>
#include <unordered_map>
// #include <unordered_set>
#include <vector>
#include <stack>
#include <string>
#include <functional>
#include <cmath>
#include <unistd.h>
#include <fcntl.h>
#include "runtime.h"
using namespace std;
extern int g_argc;
extern char **g_argv;
#define BUILTIN_GUARD_STACKSIZE(nm,sz) {if(S.size()<(sz))throw string("Builtin '" nm "' needs " #sz " stack item")+(sz==1?"":"s");}
stack<unordered_map<string,pair<Stackitem,bool>>> scopestack;
//Each stack frame contains the variables local to the stack frame. The bool is
//whether it was already present in the previous frame, and the Stackitem
//is the value held by the previous frame, if any.
//please extern this shit with const!
unordered_map<string,function<void(vector<Stackitem>&,unordered_map<string,Stackitem>&)>> builtins={
{"+",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("+",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(!a.isstr&&!b.isstr){
S.emplace_back(a.intval+b.intval);
return;
}
if(!a.isstr){
a.strval=to_string(a.intval);
a.isstr=true;
}
if(!b.isstr){
b.strval=to_string(b.intval);
b.isstr=true;
}
S.emplace_back(a.strval+b.strval);
}},
{"-",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("-",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '-' cannot accept a string argument");
S.emplace_back(a.intval-b.intval);
}},
{"*",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("*",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '*' cannot accept a string argument");
S.emplace_back(a.intval*b.intval);
}},
{"/",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("/",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '/' cannot accept a string argument");
S.emplace_back(a.intval/b.intval);
}},
{"%",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("%",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '%' cannot accept a string argument");
S.emplace_back(a.intval%b.intval);
}},
{"&",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("&",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '&' cannot accept a string argument");
S.emplace_back(a.intval&b.intval);
}},
{"|",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("|",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '|' cannot accept a string argument");
S.emplace_back(a.intval|b.intval);
}},
{"~",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("~",1)
Stackitem &back=S.back();
if(back.isstr)throw string("Builtin '~' cannot accept a string argument");
else back.intval=~back.intval;
}},
{"^",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("^",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr||b.isstr)throw string("Builtin '^' cannot accept a string argument");
S.emplace_back((int)pow(a.intval,b.intval));
}},
{"!",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("!",1)
Stackitem &back=S.back();
if(back.isstr){
back.isstr=false;
back.intval=!back.strval.size();
} else back.intval=!back.intval;
}},
{"=",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("=",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
S.emplace_back(a==b);
}},
{"<",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("<",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr&&b.isstr)S.emplace_back(a.strval<b.strval);
else if(!a.isstr&&!b.isstr)S.emplace_back(a.intval<b.intval);
else if(a.isstr)S.emplace_back(a.strval<to_string(b.intval));
else S.emplace_back(to_string(a.intval)<b.strval);
}},
{">",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE(">",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
if(a.isstr&&b.isstr)S.emplace_back(a.strval>b.strval);
else if(!a.isstr&&!b.isstr)S.emplace_back(a.intval>b.intval);
else if(a.isstr)S.emplace_back(a.strval>to_string(b.intval));
else S.emplace_back(to_string(a.intval)>b.strval);
}},
{"print",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("print",1)
Stackitem v=move(S.back()); S.pop_back();
if(v.isstr)cout<<v.strval<<flush;
else cout<<v.intval<<flush;
}},
{"lf",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("lf",0)
cout<<endl;
}},
{"getline",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("getline",0)
string line;
getline(cin,line);
if(!cin)S.emplace_back(-1);
else S.emplace_back(line);
}},
{"getc",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("getc",0)
char c=cin.get();
if(!cin)S.emplace_back(-1);
else S.emplace_back(string(1,c));
}},
{"fprint",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("fprint",2)
Stackitem file=move(S.back()); S.pop_back();
Stackitem v=move(S.back()); S.pop_back();
if(file.isstr)throw string("Second argument to 'fprint' not a number");
if(v.isstr)write(file.intval,v.strval.data(),v.strval.size());
else {
string s=to_string(v.intval);
write(file.intval,s.data(),s.size());
}
}},
{"flf",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("flf",1)
Stackitem file=move(S.back()); S.pop_back();
if(file.isstr)throw string("Argument to 'flf' not a number");
write(file.intval,"\n",1);
}},
{"fgetc",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("fgetc",1)
Stackitem file=move(S.back()); S.pop_back();
if(file.isstr)throw string("Argument to 'fgetc' not a number");
char c;
int ret=read(file.intval,&c,1);
if(ret==-1)perror("read");
if(ret<=0)S.emplace_back(-1);
else S.emplace_back(string(1,c));
}},
{"fopen",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("fopen",2)
Stackitem mode=move(S.back()); S.pop_back();
Stackitem fname=move(S.back()); S.pop_back();
if(!fname.isstr)throw string("First argument to 'fopen' not a string");
if(!mode.isstr)throw string("Second argument to 'fopen' not a string");
int oflag=0;
if(mode.strval.find('r')!=string::npos)oflag|=O_RDONLY;
if(mode.strval.find('w')!=string::npos){
if(oflag&O_RDONLY)oflag=(oflag&~O_RDONLY)|O_RDWR;
else oflag|=O_WRONLY;
}
if(mode.strval.find('a')!=string::npos)oflag|=O_APPEND;
if(mode.strval.find('x')!=string::npos)oflag|=O_EXCL|O_CREAT;
if(oflag==0)oflag=O_RDONLY;
int ret=open(fname.strval.c_str(),oflag);
if(ret<0)perror("open");
S.emplace_back(ret);
}},
{"argc",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("argc",0)
S.emplace_back(g_argc);
}},
{"argvget",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("argvget",1)
Stackitem idx=move(S.back()); S.pop_back();
if(idx.isstr)throw string("Argument to 'argvget' not a number");
if(idx.intval<0||idx.intval>=g_argc)throw string("Argument to 'argvget' out of bounds");
S.emplace_back(g_argv[idx.intval]);
}},
{"dup",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("dup",1)
S.push_back(S.back());
}},
{"pop",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("pop",1)
S.pop_back();
}},
{"swap",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("swap",2)
Stackitem b=move(S.back()); S.pop_back();
Stackitem a=move(S.back()); S.pop_back();
S.push_back(b);
S.push_back(a);
}},
{"store",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("store",2)
Stackitem name=move(S.back()); S.pop_back();
if(!name.isstr)throw string("Second argument to 'store' not a string");
auto it=variables.find(name.strval);
bool exists=it!=variables.end();
if(scopestack.size()&&scopestack.top().find(name.strval)==scopestack.top().end()){
if(exists)
scopestack.top()[name.strval]={move(variables[name.strval]),true};
else
scopestack.top()[name.strval]={Stackitem(),false};
}
//insert_or_assign is C++17 sadly
/*if(exists)variables.insert_or_assign(it,make_pair(name.strval,move(S.back())));
else variables[name.strval]=move(S.back());*/
variables[name.strval]=move(S.back());
S.pop_back();
}},
{"gstore",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("gstore",2)
Stackitem name=move(S.back()); S.pop_back();
if(!name.isstr)throw string("Second argument to 'store' not a string");
variables[name.strval]=move(S.back());
S.pop_back();
}},
{"get",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("get",1)
Stackitem name=move(S.back()); S.pop_back();
if(!name.isstr)throw string("Argument to 'get' not a string");
S.push_back(variables[name.strval]);
}},
//leaves variable with value 0
{"swapoutvar",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("swapoutvar",1)
Stackitem name=move(S.back()); S.pop_back();
if(!name.isstr)throw string("Second argument to 'swapoutvar' not a string");
S.push_back(move(variables[name.strval]));
variables[name.strval].intval=0;
}},
{"enterscope",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("enterscope",0)
scopestack.emplace();
}},
{"leavescope",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("leavescope",0)
if(scopestack.size()<1)throw string("Scope stack empty while requesting scope leave");
for(const pair<string,pair<Stackitem,bool>> &var : scopestack.top()){
if(var.second.second){
variables[var.first]=move(var.second.first);
} else {
variables.erase(var.first);
}
}
scopestack.pop();
}},
//positive n: roll OFF top to bottom; negative n: roll off bottom ONTO top
{"roll",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("roll",1)
Stackitem ns=move(S.back()); S.pop_back();
if(ns.isstr)throw string("Argument to 'roll' not a number");
int n=ns.intval;
if(S.size()<2)return;
bool negative=n<0;
if(negative)n=-n;
n%=S.size();
if(n==0)return;
if(negative){
vector<Stackitem> tempstore;
tempstore.reserve(n);
int ssz=S.size();
for(int i=ssz-n;i<ssz;i++)tempstore.push_back(move(S[i]));
S.erase(S.end()-n,S.end());
S.insert(S.begin(),n,Stackitem());
for(int i=0;i<n;i++)S[i]=move(tempstore[i]);
} else {
//cerr<<"rolling back n="<<n<<endl;
vector<Stackitem> tempstore;
tempstore.reserve(n);
for(int i=0;i<n;i++)tempstore.push_back(move(S[i]));
S.erase(S.begin(),S.begin()+n);
for(int i=0;i<n;i++)S.push_back(move(tempstore[i]));
}
}},
//leaves the string on the stack
{"stridx",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("stridx",2)
Stackitem idx=move(S.back()); S.pop_back();
const Stackitem &str=S.back();
if(!str.isstr)throw string("First argument to 'stridx' not a string");
if(idx.isstr)throw string("Second argument to 'stridx' not a number");
if(idx.intval<0||idx.intval>=(int)str.strval.size())throw string("Index argument to 'stridx' out of range");
S.emplace_back(string(1,str.strval[idx.intval]));
}},
//leaves the string on the stack
{"strlen",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("strlen",1)
const Stackitem &str=S.back();
if(!str.isstr)throw string("Argument to 'strlen' not a string");
S.emplace_back(str.strval.size());
}},
//leaves the string on the stack
{"substr",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("substr",3)
const Stackitem to=move(S.back()); S.pop_back();
const Stackitem from=move(S.back()); S.pop_back();
const Stackitem &str=S.back();
if(!str.isstr)throw string("First argument to 'substr' not a string");
if(from.isstr)throw string("Second argument to 'substr' not a number");
if(to.isstr)throw string("Third argument to 'substr' not a number");
S.emplace_back(str.strval.substr(from.intval,to.intval-from.intval));
}},
{"chr",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("chr",1)
Stackitem ascii=move(S.back()); S.pop_back();
if(ascii.isstr)throw string("Argument to 'chr' not a number");
S.emplace_back(string(1,ascii.intval));
}},
{"ord",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("ord",1)
if(!S.back().isstr)throw string("Argument to 'ord' not a string");
S.back().isstr=false;
S.back().intval=(int)S.back().strval[0];
S.back().strval="";
}},
{"sleep",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("sleep",1)
if(S.back().isstr)throw string("Argument to 'sleep' not a number");
usleep(S.back().intval);
S.pop_back();
}},
{"stackdump",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("stackdump",0)
cerr<<"STACKDUMP: ";
for(const Stackitem &si : S){
if(si.isstr)cerr<<'"'<<si.strval<<"\" ";
else cerr<<si.intval<<' ';
}
cerr<<endl;
}},
{"exit",[](vector<Stackitem> &S,unordered_map<string,Stackitem> &variables){
BUILTIN_GUARD_STACKSIZE("exit",0)
exit(0);
}},
};
#undef BUILTIN_GUARD_STACKSIZE
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