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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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17
test/test_xpath.sh
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@ -129,7 +129,7 @@ new "xpath ../../../rt:address-family = 'v6ur:ipv6-unicast'"
expecteof "$clixon_util_xpath -f $xml2 -i /aaa/bbb/here2/here" 0 "../../../rt:address-family = 'v6ur:ipv6-unicast'" "^bool:true$"
new "xpath /if:interfaces/if:interface[if:name=current()/rt:name]/ip:ipv6/ip:enabled='true'"
expecteof "$clixon_util_xpath -D 1 -f $xml2" 0 "/if:interfaces/if:interface[if:name=current()/rt:name]/ip:ipv6/ip:enabled='true'" "^bool:true$"
expectpart "$($clixon_util_xpath -f $xml2 -p "/if:interfaces/if:interface[if:name=current()/rt:name]/ip:ipv6/ip:enabled='true'")" 0 "^bool:true$"
new "xpath rt:address-family='v6ur:ipv6-unicast'"
expecteof "$clixon_util_xpath -f $xml2 -i /aaa" 0 "rt:address-family='v6ur:ipv6-unicast'" "^bool:true$"
@ -210,8 +210,21 @@ expectpart "$($clixon_util_xpath -f $xml3 -p 'derived-from-or-self(../../change-
new "xpath contains"
expectpart "$($clixon_util_xpath -f $xml3 -p "contains(../../objectClass,'BTSFunction') or contains(../../objectClass,'RNCFunction')")" 0 "bool:false"
# Just syntax - no semantic meaning
# Nodetests
new "xpath nodetest: node"
expectpart "$($clixon_util_xpath -f $xml3 -p "/bbb/ccc/self::node()")" 0 "nodeset:0:<ccc>foo</ccc>"
new "xpath nodetest: comment nyi"
expectpart "$($clixon_util_xpath -f $xml3 -l o -p "/descendant-or-self::comment()")" 255 "XPATH function \"comment\" is not implemented"
# Negative
new "xpath dontexist"
expectpart "$($clixon_util_xpath -f $xml3 -l o -p "dontexist()")" 255 "Unknown xpath function \"dontexist\""
new "xpath enum-value nyi"
expectpart "$($clixon_util_xpath -f $xml3 -l o -p "enum-value()")" 255 "XPATH function \"enum-value\" is not implemented"
rm -rf $dir