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Accepted
Duncan
Asked:2022-07-16 16:43:31 +0000 UTC2022-07-16 16:43:31 +0000 UTC

如何修复 YAML 中逐字标记的显示问题？

  • 772

我正在尝试创建 yaml

import sys
from ruamel.yaml import YAML

class Entry:
    yaml_tag = '!<!entry>'

    def __init__(self, value, style=None):
        self.value = value
        self.style = style

    @classmethod
    def to_yaml(cls, representer, node):
        return representer.represent_mapping(cls.yaml_tag, node.value, node.style)

    @classmethod
    def from_yaml(cls, constructor, node):
        return cls(node.value, node.style)

data = {
    'steps': [
        Entry({
            'id': 'Entry-1',
            'actions': [],
        })
    ],
}

yaml = YAML(typ='rt')
yaml.register_class(Entry)
yaml.dump(data, sys.stdout)

但在输出中，!<!entry>我得到了!%3C%21entry%3E.

steps:
- !%3C%21entry%3E
  id: Entry-1
  actions: []
python yaml

1 个回答

  1. Best Answer

    此处建议的解决方案：https
    ://stackoverflow.com/a/72256797/8058496 目前无法使用绝对标签。ruamel.yaml 可以读取它们但不能渲染它们。
    他们建议对输出进行后处理以替换标签的开头和结尾：

    import sys
from ruamel.yaml import YAML

class Entry:
    yaml_tag = '!<!entry>'

    def __init__(self, value, style=None):
        self.value = value
        self.style = style

    @classmethod
    def to_yaml(cls, representer, node):
        return representer.represent_mapping(cls.yaml_tag, node.value, node.style)

    @classmethod
    def from_yaml(cls, constructor, node):
        return cls(node.value, node.style)

data = {
    'steps': [
        Entry({
            'id': 'Entry-1',
            'actions': [],
        })
    ],
}

def post(s):
    PAT = '!%3C%21'
    res = []
    for line in s.splitlines(True):
        while PAT in line:
            start, rest = line.split(PAT, 1)
            line = start + '!<!' + (rest.replace('%3E', '>'))
        res.append(line)
    return ''.join(res)


yaml = YAML(typ='rt')
yaml.register_class(Entry)
yaml.dump(data, sys.stdout, transform=post)

    结果我们得到：

    steps:
- !<!entry>
  id: Entry-1
  actions: []
    • 2

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