解析字符串以在Xlib中着色文本

时间:2014-07-23 11:08:17

标签: c parsing xlib x-dwm

我正在尝试为DWM 6.1编写一个补丁来为状态栏着色,到目前为止我已设法这样做了,但我使用的是十六进制字符,如\x01来表示颜色。这样做我发现了一个问题。当dwm获得状态栏的宽度时,也会使用转义字符进行计数,从而导致错误的状态栏。

我写了一个虚拟程序试图解决这个问题。我的想法是,给出以下状态文本:

char buf[] = "Hello World\x01, Bye!\x02";

必须用颜色1写Hello World,用颜色2写, Bye!。我想解析文本并得到:

char cleanBuf[] = "Hello World, Bye!";

我已经做到了。但是现在我需要以某种方式记住转义序列所在的位置,以便用相应的颜色绘制文本。我认为按照它们出现的顺序存储颜色stack,在这种情况下,堆栈将具有{color1, color2}。对于文本的开头和结尾指针必须采用颜色的结构,Hello World我需要一个指向H的指针和另一个指向d的指针。这样我就可以创建一个新的字符串来解析XDrawString并用相应的颜色打印出来。

这是最好的方法吗?我想我的事情有点复杂化了。如果您想尝试,完整的程序是here。我在这里粘贴主循环:

while (1) {
  XNextEvent(dpy, &e);

  if (e.type == Expose && e.xexpose.count < 1) {

    char buf[] = "Hello World\x01, Bye!\x02";
    char cleanBuf[strlen(buf)];
    memset(cleanBuf, 0, strlen(cleanBuf));
    char *copy = strdup(buf);
    char *delim = "\x01\x02";
    char *res = strtok(buf, delim);
    strcat(cleanBuf, res);
    unsigned long color1 = 0xff0000;
    unsigned long color2 = 0x00ff00;
    unsigned long color;
    int x = 10;
    while (res) {
      /* Figure out what delimiter was used */
      // Thanks to http://stackoverflow.com/a/12460511/1612432
      char deli = copy[res - buf + strlen(res)];
      if (deli == '\x01')
        color = color1;
      else if (deli == '\x02')
        color = color2;
      else
        color = 0xffffff;
      XSetForeground(dpy, gc, color);
      XDrawString(dpy, win, gc, x, 10, res, strlen(res));
      x += 50;
      res = strtok(0, delim);
      if (res)
        strcat(cleanBuf, res);
    }
    free(copy);

  } else if (e.type == ButtonPress)
    break;

}

1 个答案:

答案 0 :(得分:1)

我终于可以使用以下方法解析字符串:

void
parsestatus(char *text, unsigned long *color_queue, char tokens[][256]) {

  // TODO move variables that can to main in order to not recreated them
  char *copy = strdup(text);
  char cleanBuf[strlen(text)];
  memset(cleanBuf, 0, strlen(cleanBuf));

  char delim[NUMCOLORS+1];

  /* Thanks to http://stackoverflow.com/a/24931903/1612432 */
  for (int i = 0; i < NUMCOLORS; ++i)
      delim[i] = i + 1;
  /* Terminates as string */
  delim[NUMCOLORS] = '\0';

  char *res = strtok(copy, delim);
  strcat(tokens[0], res);
  strcat(cleanBuf, res);
  int i = 1;

  while (res) {
    /* Figure out what delimiter was used */
    // Thanks to http://stackoverflow.com/a/12460511/1612432
    int deli = text[res - copy + strlen(res)] - 1;
    color_queue[i-1] = colors[deli];
    res = strtok(0, delim);
    if (res){
      strcat(tokens[i++], res);
      strcat(cleanBuf, res);
    }
  }
  free(copy);
  strncpy(text, cleanBuf, strlen(cleanBuf));
  text[strlen(cleanBuf)] = '\0';
}

然后,在每次调用XmbDrawString之后,我会减去终止字符的长度,如下所示:

tx += TEXTW(text[k]) - TEXTW("\x0");