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#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <cmath>
#include <cctype>
#include <cassert>
#include "flogo.h"
#include "engine.h"
using namespace std;
bool iswordstartchar(char c){return isalpha(c)||c=='_'||c=='.'||c==':';}
bool iswordchar(char c){return iswordstartchar(c)||isdigit(c);}
bool isoperator(char c){return strchr("+-*/=<>()[]",c)!=NULL;}
vector<string> tokenise(const char *str){
vector<string> tkns;
const char *p=str;
while(true){
while(*p&&isspace(*p))p++;
if(!*p)break;
if(*p==';'){
while(*p&&*p!='\n')p++;
continue;
}
string s;
if(iswordstartchar(*p)){
do s+=*p++;
while(*p&&iswordchar(*p));
} else if(isdigit(*p)){
bool havedot=false;
do {
if(*p=='.'){
if(!havedot)havedot=true;
else break;
} else if(!isdigit(*p))break;
s+=*p++;
} while(*p);
} else if(*p=='"'){
while(*p&&!isspace(*p))s+=*p++;
} else if(isoperator(*p))s+=*p++;
else {
cerr<<"UNKNOWN CHAR <"<<*p<<'>'<<endl;
p++;
}
tkns.push_back(move(s));
}
return tkns;
}
void logocommand(const char *str){
int i;
vector<string> tkns=tokenise(str);
const int ntkns=tkns.size();
for(i=0;i<ntkns;i++){
if(tkns[i]=="forward"||tkns[i]=="fd"){
if(i+1>=ntkns)assert(false);
const int n=stoi(tkns[i+1]);
const int newx=turtle.x+n*sin(turtle.dir*M_PI/180),newy=turtle.y-n*cos(turtle.dir*M_PI/180);
drawline(turtle.x,turtle.y,newx,newy);
turtle.x=newx; turtle.y=newy;
drawturtle();
i++;
} else if(tkns[i]=="left"||tkns[i]=="lt"){
if(i+1>=ntkns)assert(false);
const int n=stoi(tkns[i+1]);
turtle.dir-=n;
drawturtle();
i++;
} else if(tkns[i]=="right"||tkns[i]=="rt"){
if(i+1>=ntkns)assert(false);
const int n=stoi(tkns[i+1]);
turtle.dir+=n;
drawturtle();
i++;
} else if(tkns[i]=="bye")exit(0);
}
}
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