6

我有一个这样的结构,我想使用以下方式添加注释行ruamel.yaml

xyz:
  a: 1    # comment 1
  b: 2

test1:
  test2:
    test3: 3

现在,我想插入注释行(不是 eol_comments)使其看起来像这样:

xyz:
  a: 1    # comment 1
  b: 2

# before test1 (top level)
test1:
  # before test2
  test2:
    # after test2
    test3: 3

我知道,我可以使用添加 eol_comments ruamel.yaml,但我没有找到添加整个注释行的方法。

4

1 回答 1

8

确实没有在ruamel.yaml<=0.12.18键前的行上插入注释的功能,但是有一个功能可以在结构的开头设置注释:.yaml_set_start_comment. 有了它,您已经可以设置要添加的三个评论中的两个:

import sys
import ruamel.yaml

yaml_str = """\
xyz:
  a: 1    # comment 1
  b: 2

test1:
  test2:
    test3: 3
"""

data = ruamel.yaml.round_trip_load(yaml_str)
data['test1'].yaml_set_start_comment('before test2', indent=2)
data['test1']['test2'].yaml_set_start_comment('after test2', indent=4)
ruamel.yaml.round_trip_dump(data, sys.stdout)

给出:

xyz:
  a: 1    # comment 1
  b: 2

test1:
  # before test2
  test2:
    # after test2
    test3: 3

实际上,在xyzand的值之间有一个由空行构成的“注释” test1,但是如果您将注释附加到该结构,然后在test1事情没有按您想要的那样显示之前插入一个新键。因此要做的是在 key 之前显式插入注释test1。您可以往返加载您的预期输出,以查看内部Comment应该是什么样子:

yaml_str_out = """\
xyz:
  a: 1    # comment 1
  b: 2

# before test1 (top level)
test1:
  # before test2
  test2:
    # before test3
    test3: 3
"""
test = ruamel.yaml.round_trip_load(yaml_str_out)
print(test.ca)

给出(包装这个以便于查看):

Comment(comment=None,
        items={'test1': [None, 
                        [CommentToken(value='# before test1 (top level)\n')], 
                        None, 
                        [CommentToken(value='# before test2\n')]]})

如您所见# before test2,被认为是键后的注释。并且这样做test['test1'].yaml_set_start_comment('xxxxx', indent=2)不会产生任何影响,因为与test1否决相关的评论# xxxxx不会出现在转储中。

有了这些信息和一些背景知识,我改编了一些代码yaml_set_start_comment()(假设原始导入和yaml_str):

def yscbak(self, key, before=None, indent=0, after=None, after_indent=None):
    """
    expects comment (before/after) to be without `#` and possible have multiple lines
    """
    from ruamel.yaml.error import Mark
    from ruamel.yaml.tokens import CommentToken

    def comment_token(s, mark):
        # handle empty lines as having no comment
        return CommentToken(('# ' if s else '') + s + '\n', mark, None)

    if after_indent is None:
        after_indent = indent + 2
    if before and before[-1] == '\n':
        before = before[:-1]  # strip final newline if there
    if after and after[-1] == '\n':
        after = after[:-1]  # strip final newline if there
    start_mark = Mark(None, None, None, indent, None, None)
    c = self.ca.items.setdefault(key, [None, [], None, None])
    if before:
        for com in before.split('\n'):
            c[1].append(comment_token(com, start_mark))
    if after:
        start_mark = Mark(None, None, None, after_indent, None, None)
        if c[3] is None:
            c[3] = []
        for com in after.split('\n'):
            c[3].append(comment_token(com, start_mark))

if not hasattr(ruamel.yaml.comments.CommentedMap, 
               'yaml_set_comment_before_after_key'):
    ruamel.yaml.comments.CommentedMap.yaml_set_comment_before_after_key = yscbak


data = ruamel.yaml.round_trip_load(yaml_str)
data.yaml_set_comment_before_after_key('test1', 'before test1 (top level)',
                                       after='before test2', after_indent=2)
data['test1']['test2'].yaml_set_start_comment('after test2', indent=4)
ruamel.yaml.round_trip_dump(data, sys.stdout)

并得到:

xyz:
  a: 1    # comment 1
  b: 2

# before test1 (top level)
test1:
  # before test2
  test2:
    # after test2
    test3: 3

测试hasattr是确保当它被添加到时你不会覆盖这样的函数ruamel.yaml

顺便说一句:所有注释都是 YAML 中的行尾注释,在其中一些注释之前可能只有有效的 YAML。

于 2016-11-20T15:13:46.233 回答