how to get length of nested array? and extract all son keys?

[xkungfu]

yaml 1:

'list':
  '2021-10-08':
    - code: '300209'
      focusstr: ''
    - code: '300047'
      focusstr: ''
    - code: '300970'
      focusstr: ''
    - code: '300288'
      focusstr: ''
  '2021-10-11':
    - code: '300162'
      focusstr: ''
    - code: '300209'
      focusstr: ''
    - code: '300972'
      focusstr: ''
    - code: '300159'
      focusstr: ''

yaml2:

'2021-10-08':
  - code: '300209'
    focusstr: ''
  - code: '300047'
    focusstr: ''
  - code: '300970'
    focusstr: ''
  - code: '300288'
    focusstr: ''
'2021-10-11':
  - code: '300162'
    focusstr: ''
  - code: '300209'
    focusstr: ''
  - code: '300972'
    focusstr: ''
  - code: '300159'
    focusstr: ''

want to get how many date string in the yaml, and extract all the date strings to a array such as vector.
so I can loop the yaml by date keys.

thanks!

[sea-kg]

Try this:

For yaml1:

WsjcppYaml yaml;
std::vector<std::string> vKeys = yaml["list"].keys();

For yaml2:

WsjcppYaml yaml;
std::vector<std::string> vKeys = yaml.getCursor().keys();

More samples

std::string sTest =     
        "'2021-10-08':\n"
        "  - code: '300209'\n"
        "    focusstr: ''\n"
        "  - code: '300047'\n"
        "    focusstr: ''\n"
        "  - code: '300970'\n"
        "    focusstr: ''\n"
        "  - code: '300288'\n"
        "    focusstr: ''\n"
        "'2021-10-11':\n"
        "  - code: '300162'\n"
        "    focusstr: ''\n"
        "  - code: '300209'\n"
        "    focusstr: ''\n"
        "  - code: '300972'\n"
        "    focusstr: ''\n"
        "  - code: '300159'\n"
        "    focusstr: ''\n"
    ;

    WsjcppYaml yaml2;
    if (!yaml2.loadFromString("test", sTest, sError)) {
        return -1;
    }
    WsjcppYamlCursor cur = yaml2.getCursor();
    std::vector<std::string> vKeys = cur.keys();
    for (int i = 0; i < vKeys.size(); i++) {
        std::string sKey = vKeys[i];
        int nCount = cur[sKey].size(); // musts array
        for (int n = 0; n < nCount; n++) {
            WsjcppYamlCursor el = cur[sKey][n];
            std::cout
                << "code = " << el["code"].valInt()
                << "; focusstr = " << el["focusstr"].valStr()
                << ";"
                << std::endl;
        }
    }

output:

code = 300209; focusstr = ;
code = 300047; focusstr = ;
code = 300970; focusstr = ;
code = 300288; focusstr = ;
code = 300162; focusstr = ;
code = 300209; focusstr = ;
code = 300972; focusstr = ;
code = 300159; focusstr = ;

[xkungfu]

I will try and post codes tomorrow.
thank you very much!

[sea-kg]

You welcome!

[xkungfu]

WsjcppYamlCursor el = cur[sKey][n];

I just tried to write a loop for almost one hour and haven't got a right output, then find your code.
I am a newbie.
thanks for your detailed guide step by step!

[xkungfu]

one more question:
python yaml generate the format without indent, or indent after "-", like below:

with open(path, 'w') as f:
 yaml.dump(a_dict, f,  default_flow_style=False, sort_keys=False)

generate result like:
std::string sTest =     
        "'2021-10-08':\n"
        "-code: '300209'\n"
        " focusstr: ''\n"
        "-code: '300047'\n"
        " focusstr: ''\n"
        "-code: '300970'\n"
        " focusstr: ''\n"
        "-code: '300288'\n"
        " focusstr: ''\n"
        "'2021-10-11':\n"
        "-code: '300162'\n"
        " focusstr: ''\n"
        "-code: '300209'\n"
        " focusstr: ''\n"
        "-code: '300972'\n"
        " focusstr: ''\n"
        "-code: '300159'\n"
        " focusstr: ''\n"
    ;

with open(path, 'w') as f:
 yaml.dump(a_dict, f, indent=4, default_flow_style=False, sort_keys=False)

generate result like:
std::string sTest =     
        "'2021-10-08':\n"
        "-    code: '300209'\n"
        "     focusstr: ''\n"
        "-    code: '300047'\n"
        "     focusstr: ''\n"
        "-    code: '300970'\n"
        "     focusstr: ''\n"
        "-    code: '300288'\n"
        "     focusstr: ''\n"
        "'2021-10-11':\n"
        "-    code: '300162'\n"
        "     focusstr: ''\n"
        "-    code: '300209'\n"
        "     focusstr: ''\n"
        "-    code: '300972'\n"
        "     focusstr: ''\n"
        "-    code: '300159'\n"
        "     focusstr: ''\n"
    ;

It seems with indent or without indent are all valid, but wsjcpp-yaml need indent at the line start of array elements.

[sea-kg]

@xkungfu sorry for a longtime.... so... python can parse this?