使用 gperf 时遇到问题：不允许输入空关键字

发布于 2024-10-22 04:53:30 字数 935 浏览 4 评论 0原文

command_options.gperf：

%{
#include "command_options.h"
typedef struct CommandOptionCode CommandOptionCode;
%}
struct CommandOption
  {
  const char *Option;
  int OptionCode;
  };
%%
+helpverbose, CommandOptionCode::HELPVERBOSE
+password, CommandOptionCode::PASSWORD
+nocopyright, CommandOptionCode::NOCOPYRIGHT
+nolog, CommandOptionCode::NOLOG
+_64bit, CommandOptionCode::_64BIT

command_options.h：

#ifndef __COMMANDOPTIONS_H
#define __COMMANDOPTIONS_H
struct CommandOptionCode 
  {
  enum 
    {
    HELPVERBOSE = 1,
    PASSWORD = 2,
    NOCOPYRIGHT = 3,
    NOLOG = 4,
    _64BIT = 5
    };
  };
#endif

当我运行时：

gperf  -L C++ -t --output-file=perfecthash.hpp command_options.gperf

仅获取：

不允许输入空关键字。到识别空输入关键字，您的代码应该在之前检查 len == 0 调用 gperf 生成的查找功能。

版本：GNU gperf 3.0.1 为什么？

原文

command_options.gperf:

%{
#include "command_options.h"
typedef struct CommandOptionCode CommandOptionCode;
%}
struct CommandOption
  {
  const char *Option;
  int OptionCode;
  };
%%
+helpverbose, CommandOptionCode::HELPVERBOSE
+password, CommandOptionCode::PASSWORD
+nocopyright, CommandOptionCode::NOCOPYRIGHT
+nolog, CommandOptionCode::NOLOG
+_64bit, CommandOptionCode::_64BIT

command_options.h:

#ifndef __COMMANDOPTIONS_H
#define __COMMANDOPTIONS_H
struct CommandOptionCode 
  {
  enum 
    {
    HELPVERBOSE = 1,
    PASSWORD = 2,
    NOCOPYRIGHT = 3,
    NOLOG = 4,
    _64BIT = 5
    };
  };
#endif

When I run:

gperf  -L C++ -t --output-file=perfecthash.hpp command_options.gperf

Only to get :

Empty input keyword is not allowed. To
recognize an empty input keyword, your
code should check for len == 0 before
calling the gperf generated lookup
function.

Version: GNU gperf 3.0.1
Why?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

海之角 2024-10-29 04:53:30

我发现 gperf 2.7 不关心第一部分和关键字之间是否有“%%”分隔符。 3.0.1 严格执行这一点。因此，就我而言，我进行了修改：

%{
#include <string.h>
%}

scan

我相信，您的情况有所

%{
#include <string.h>
%}
%%

scan

不同，因为手册规定结构的第一个字段必须称为“名称”：

"This first field must be called `name', although it is possible to modify its name with the `-K' option (or, equivalently, the `%define slot-name' declaration) described below."

-charlie

I discovered that gperf 2.7 did not care if there was a '%%' delimiter between the first section and the keywords. 3.0.1 strictly enforces this. So, in my case I had modify:

%{
#include <string.h>
%}

scan

to be

%{
#include <string.h>
%}
%%

scan

Your case is different, I belive, in that the manual states that the first field of the struct must be called 'name':

"This first field must be called `name', although it is possible to modify its name with the `-K' option (or, equivalently, the `%define slot-name' declaration) described below."

-charlie

回复收藏 0 原文