[英]Default string values for union types in Yang Schema
Why can't the leaf wibble
be assigned a default value "-"
in the following schema (comments not in schema, added to post for clarity)为什么不能在下面的模式中为叶子wibble
分配一个默认值"-"
(注释不在模式中,为了清楚起见添加到帖子中)
module type
{
namespace "example.com";
prefix "foo";
typedef optional-value {
type union {
type uint8 {
range "0 .. 99";
}
type string {
pattern "^-$";
}
}
}
container bar {
leaf wibble {
type optional-value;
default "-"; ### NOT OKAY
}
leaf wobble {
type optional-value;
default 42; ### OKAY
}
}
}
yanglint (version 0.16.105) does not validate the above schema and returns the error message: yanglint(版本 0.16.105)不验证上述架构并返回错误消息:
err : Invalid value "-" in "wibble" element. (/type:wibble)
err : Module "type" parsing failed.
Done some more experimenting and it appears that strings with patterns cannot be assigned default values做了一些更多的实验,似乎无法为带有模式的字符串分配默认值
module tmp
{
namespace "example.com";
prefix "foo";
container bar {
leaf wibble {
type string {
pattern "^x$";
}
default "x"; ### NOT OKAY
}
leaf wobble {
type string;
default "y"; ### OKAY
}
}
}
yanglint output:杨林特输出:
err : Value "x" does not satisfy the constraint "^x$" (range, length, or pattern). (/tmp:wibble)
err : Module "tmp" parsing failed.
In YANG one uses the regex flavor from XML Schema which doesn't require ^$
to anchor expressions so that they math the entire value.在 YANG 中,使用XML Schema 中的正则表达式风格,它不需要^$
来锚定表达式,以便它们对整个值进行数学运算。 All XSD expressions are implicitly anchored.所有 XSD 表达式都是隐式锚定的。 You could try to remove these characters from your patterns and give it another try.您可以尝试从您的模式中删除这些字符,然后再试一次。
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