tree fcb2b217c09f2603361cb4c306d5a8293369d92d
parent 3081afad32f08e1384e36171f428a37c5dc957d2
author Jan Kundrát <jan.kundrat@cesnet.cz> 1536937531 +0200
committer Jan Kundrát <kundrat@cesnet.cz> 1536938381 +0200

Correct escaping of list keys with single quotes

YANG 1.1 still uses XPath 1.0 which defines [1] strings in such a manner
that it is impossible to represent both single and double quotes in the
same string. That's why sysrepo chokes on such XPaths, for example.

Let's just ensure that anything which already contains an apostrophe (a
single quote) will be double-quoted instead of the default single-quoted
thingy.

Note that the parser itself treats all list keys as strings internally;
there's no validation, and the information about the underlying data
type is not preserved. That's why a numeric list key would be still
single-quoted in the current code.

[1] https://www.w3.org/TR/1999/REC-xpath-19991116/#exprlex

Change-Id: I87a2b88bb4f5d8f3383c1637088980c5a670aee3