visutils.h

#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif

#include <string>
#include <vector>
#include <iostream>
#include <fstream>

using std::string;

int digits;

inline string its(int i) {
  char buf[16];
  sprintf(buf, "%*d", digits, i);
  return buf;
  }

inline string sts(string s0) {
  char buf[16];
  sprintf(buf, "%*s", digits, s0.c_str());
  return buf;
  }

string s0 = "";

inline string maymark(string s, bool marked) {
  if(!marked) return s;
  return "<font color='red'><b>" + s + "</b></font>";
  }

#ifdef EMSCRIPTEN
void set_value(string name, string s) {
  EM_ASM_({
    var name = UTF8ToString($0, $1);
    var value = UTF8ToString($2, $3);
    document.getElementById(name).innerHTML = value;
    }, name.c_str(), int(name.size()),
    s.c_str(), int(s.size())
    );
  }
#else
void set_value(string name, string s) {
  printf("output on %s:\n%s\n", name.c_str(), s.c_str());
  }
#endif

#ifdef EMSCRIPTEN
void set_edit_value(string name, string s) {
  EM_ASM_({
    var name = UTF8ToString($0, $1);
    var value = UTF8ToString($2, $3);
    document.getElementById(name).value = value;
    }, name.c_str(), int(name.size()),
    s.c_str(), int(s.size())
    );
  }
#else
void set_edit_value(string name, string s) {
  printf("value on %s:\n%s\n", name.c_str(), s.c_str());
  }
#endif

inline void outputHTML(string s) {
#ifdef EMSCRIPTEN
  set_value("result", s);
#else
  ofstream of("output.html");
  of << s;
  printf("Output written to 'output.html'\n");
#endif
  }