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More XPath function support

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* `count`, `name`, `contains`, `not`, as defined in [xpath 1.0](https://www.w3.org/TR/xpath-10)
  * `deref`, `derived-from` and `derived-from-or-self` from RFC7950 Section 10.
    * in particular in augment/when statements
  * Improved error handling
    * Verification of XPath functions is done at startup when yang modules are loaded, not when XPaths are evaluated.
    * Separation of "not found" and "not implemented" XPath functions
    * Both give a fatal error (backend does not start).
This commit is contained in:
Olof hagsand 2020-09-23 15:35:01 +02:00
parent 2994d2f9a9
commit 21ac47915b
14 changed files with 715 additions and 132 deletions
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7
lib/src/clixon_yang_parse_lib.c
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@ -90,6 +90,8 @@
#include "clixon_hash.h"
#include "clixon_xml.h"
#include "clixon_xml_nsctx.h"
#include "clixon_xpath_ctx.h"
#include "clixon_xpath.h"
#include "clixon_yang_module.h"
#include "clixon_plugin.h"
#include "clixon_data.h"
@ -1493,6 +1495,11 @@ ys_parse_sub(yang_stmt *ys,
goto done;
}
break;
case Y_MUST:
case Y_WHEN:
if (xpath_parse(yang_argument_get(ys), NULL) < 0)
goto done;
break;
case Y_REVISION:
case Y_REVISION_DATE: /* YYYY-MM-DD encoded as uint32 YYYYMMDD */
if (ys_parse_date_arg(arg, &date) < 0)