Class: Mathematical::Process

Inherits:
Object
  • Object
show all
Defined in:
ext/mathematical/mathematical.c

Instance Method Summary collapse

Constructor Details

#initialize(rb_Options) ⇒ Object 



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# File 'ext/mathematical/mathematical.c', line 42

static VALUE MATHEMATICAL_init(VALUE self, VALUE rb_Options)
{
  Check_Type (rb_Options, T_HASH);
  VALUE rb_ppi, rb_zoom, rb_maxsize, rb_format;

  rb_ppi = rb_hash_aref(rb_Options, CSTR2SYM("ppi"));
  rb_zoom = rb_hash_aref(rb_Options, CSTR2SYM("zoom"));
  rb_maxsize = rb_hash_aref(rb_Options, CSTR2SYM("maxsize"));
  rb_format = rb_hash_aref(rb_Options, CSTR2SYM("formatInt"));

  Check_Type(rb_ppi, T_FLOAT);
  Check_Type(rb_zoom, T_FLOAT);
  Check_Type(rb_maxsize, T_FIXNUM);
  Check_Type(rb_format, T_FIXNUM);

  rb_iv_set(self, "@ppi", rb_ppi);
  rb_iv_set(self, "@zoom", rb_zoom);
  rb_iv_set(self, "@maxsize", rb_maxsize);
  rb_iv_set(self, "@format", rb_format);

  rb_iv_set(self, "@png", Qnil);
  rb_iv_set(self, "@svg", Qnil);

  return self;
}

Instance Method Details

#process(rb_Input) ⇒ Object 



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# File 'ext/mathematical/mathematical.c', line 197

static VALUE MATHEMATICAL_process(VALUE self, VALUE rb_Input)
{
  unsigned long maxsize = (unsigned long) FIX2INT(rb_iv_get(self, "@maxsize"));

  // make sure that the passed latex string is not larger than the maximum value of a signed long (or the maxsize option)
  if (maxsize == 0) {
    maxsize = LONG_MAX;
  }

#if !GLIB_CHECK_VERSION(2,36,0)
  g_type_init ();
#endif

  const char *latex_code;
  unsigned long latex_size;

  VALUE output;

  switch (TYPE(rb_Input)) {
  case T_STRING: {
    latex_code = StringValueCStr(rb_Input);
    latex_size = (unsigned long) strlen(latex_code);
    output = process(self, maxsize, latex_code, latex_size);
    break;
  }
  case T_ARRAY: {
    int length = RARRAY_LEN(rb_Input), i;
    VALUE hash;
    output = rb_ary_new2(length);
    global_start = 1;

    for (i = 0; i < length; i++) {
      // grab the ith element
      VALUE math = rb_ary_entry(rb_Input, i);

      // get the string and length
      latex_code = StringValueCStr(math);
      latex_size = (unsigned long) strlen(latex_code);

      // `process` can potentially raise a bunch of exceptions, so we need to wrap
      // the call in a rescue. And `rb_rescue` only takes one argument, so we need
      // to pack everything in an array, and then unpack it in `process_helper`.
      VALUE args[5];
      args[0] = self;
      args[1] = ULONG2NUM(maxsize);
      args[2] = math;
      args[3] = ULONG2NUM(latex_size);
      hash = rb_rescue(process_helper, args, process_failed, 0);

      // the call errored; just store the same string
      if (hash == Qnil) {
        rb_ary_store(output, i, math);
      } else {
        rb_ary_store(output, i, hash);
      }
    }
    break;
  }
  default: {
    /* should be impossible, Ruby code prevents this */
    print_and_raise(rb_eTypeError, "not valid value");
    output = NULL;
    break;
  }
  }

  return output;
}