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correctly handle options like '-f a.txt' #251
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duyanning
commented
Dec 1, 2023
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// renamed to tb_normalized_option_done because it can only | ||
// handle normalized options (i.e., options like '-f=a.txt'). | ||
// In the style of tbox, use norm instead of normalized | ||
ok = tb_norm_option_done(option, argc, argv); |
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不能这么改,只能在 tb_option_done 一次性处理解析所有,不要分两个接口
* | ||
* @return tb_true or tb_false | ||
*/ | ||
tb_bool_t tb_norm_option_done(tb_option_ref_t option, tb_size_t argc, tb_char_t** argv); |
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所以接口都是 tb_option_ 开头的,另外就一个参数解析,不要加新接口
而且这里改了名,还会 break 现有用户
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// Prints the command-line arguments before normalization | ||
// tb_trace_i("OLD:"); | ||
// tb_print_argv(argc, argv); |
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无关注释删了
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// Normalize the parameters, i.e., transform the form '-f a.txt' into the form '-f=a.txt' | ||
// Make a two-dimensional character array to hold command-line arguments | ||
// The number of first dimensions will not exceed 'argc' |
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多行注释用 /* */
// (why +1, because of the equal sign) | ||
// Let's find out how long the longest argv[i] is | ||
tb_size_t i = 0; | ||
tb_size_t longest = 0; |
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中间不要空这么多
// Allocate space | ||
tb_char_t* data = tb_malloc(argc * (2*longest+1+1)); // including the trailing '\0' | ||
// Allocate space for normalized argv array. Array elements are of tb_char_t* | ||
tb_char_t** new_argv = tb_malloc(argc * sizeof (tb_char_t*)); |
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为啥解析个参数,还要两次分配。尽量保证 无分配解析
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其他地方我都可以按您的修改意见进行修改,
但这块不分配内存我好像搞不定。
为了尽可能地避免与您之前的实现在行为上产生细微差异,从而打破tbox用户的已有代码,
我选择了这样一种做法:
先将
-f a.txt -h file0 -f=b.txt file1 --config c.txt file2 --config=d.txt file3 -f -h file4
(其中-f、--config带参数,-h不带参数)
这种形式的命令行参数规范化为
-f=a.txt -h file0 -f=b.txt file1 --config=c.txt file2 --config=d.txt file3 -f -h file4
这种形式,(即给该加等号的地方加上等号)
然后直接调用您原来的接口进行解析。
我两次分配内存,都是为了不影响用户已有的代码。
一次是为规划化后的argv[]数组分配空间,
一次是为规范化后的argv[]数组各元素所指字符串分配空间。
规范化后的argv[]数组的元素个数可能少于原来的argv[]数组,
数组各个元素所指的字符串可能也不同于原来的原来的argv[]数组。
例如:
原来的argv[]数组长这样:
argc: 14
argv[0]: -f
argv[1]: a.txt
argv[2]: -h
argv[3]: file0
argv[4]: -f=b.txt
argv[5]: file1
argv[6]: --config
argv[7]: c.txt
argv[8]: file2
argv[9]: --config=d.txt
argv[10]: file3
argv[11]: -f
argv[12]: -h
argv[13]: file4
规范化后长这样:
argc: 12
argv[0]: -f=a.txt
argv[1]: -h
argv[2]: file0
argv[3]: -f=b.txt
argv[4]: file1
argv[5]: --config=c.txt
argv[6]: file2
argv[7]: --config=d.txt
argv[8]: file3
argv[9]: -f
argv[10]: -h
argv[11]: file4
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为啥解析个参数,还要两次分配。尽量保证 无分配解析
算了,我放弃。
我才发现对于类型为 TB_OPTION_TYPE_BOOL 的key,
其后可跟可不跟val,不跟默认true。
不分配内存,在原地解析,
复杂度超出我的预期,不想在这上面花时间了。
感谢ruki长久以来的艰辛工作。
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那你关了吧,或者可以用一些现成的解析库,xmake-repo 上面一堆了。。
ruki-2:xmake-repo ruki$ xrepo search opt
The package names:
opt:
-> popt-1.19: C library for parsing command line parameters (in xmake-repo)
-> docopt-v0.6.3: Pythonic command line arguments parser (C++11 port) (in xmake-repo)
-> cxxopts-v3.1.1: Lightweight C++ command line option parser (in xmake-repo)
-> cgetopt-1.0: A GNU getopt() implementation written in pure C. (in xmake-repo)
-> cargs-v1.0.3: A lightweight cross-platform getopt alternative that works on Linux, Wind
ows and macOS. Command line argument parser library for C/C++. Can be used to parse argv and arg
c parameters. (in xmake-repo)
{ | ||
tb_trace_i("argv[%d]: %s", i, argv[i]); | ||
} | ||
} |
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这种 print 代码删了
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// Prints the normalized command-line arguments | ||
// tb_trace_i("NEW:"); | ||
// tb_print_argv(new_argc, new_argv); |
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删了