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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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59
lib/src/clixon_xpath_function.h
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@ -38,10 +38,67 @@
#ifndef _CLIXON_XPATH_FUNCTION_H
#define _CLIXON_XPATH_FUNCTION_H
/*
* Types
*/
/*
* XPath functions from Xpath 1.0 spec or YANG
* @see xp_checkfn where they are parsed and checked
* @see clixon_xpath_function.c for implementations
*/
enum clixon_xpath_function{
XPATHFN_CURRENT, /* RFC 7950 10.1.1 */
XPATHFN_RE_MATCH, /* RFC 7950 10.2.1 NYI */
XPATHFN_DEREF, /* RFC 7950 10.3.1 */
XPATHFN_DERIVED_FROM, /* RFC 7950 10.4.1 */
XPATHFN_DERIVED_FROM_OR_SELF, /* RFC 7950 10.4.2 */
XPATHFN_ENUM_VALUE, /* RFC 7950 10.5.1 NYI */
XPATHFN_BIT_IS_SET, /* RFC 7950 10.6.1 NYI */
XPATHFN_LAST, /* XPATH 1.0 4.1 NYI */
XPATHFN_POSITION, /* XPATH 1.0 4.1 NYI */
XPATHFN_COUNT, /* XPATH 1.0 4.1 */
XPATHFN_ID, /* XPATH 1.0 4.1 NYI */
XPATHFN_LOCAL_NAME, /* XPATH 1.0 4.1 NYI */
XPATHFN_NAMESPACE_URI, /* XPATH 1.0 4.1 NYI */
XPATHFN_NAME, /* XPATH 1.0 4.1 */
XPATHFN_STRING, /* XPATH 1.0 4.2 NYI */
XPATHFN_CONCAT, /* XPATH 1.0 4.2 NYI */
XPATHFN_STARTS_WITH, /* XPATH 1.0 4.2 NYI */
XPATHFN_CONTAINS, /* XPATH 1.0 4.2 */
XPATHFN_SUBSTRING_BEFORE, /* XPATH 1.0 4.2 NYI */
XPATHFN_SUBSTRING_AFTER, /* XPATH 1.0 4.2 NYI */
XPATHFN_SUBSTRING, /* XPATH 1.0 4.2 NYI */
XPATHFN_STRING_LENGTH, /* XPATH 1.0 4.2 NYI */
XPATHFN_NORMALIZE_SPACE, /* XPATH 1.0 4.2 NYI */
XPATHFN_TRANSLATE, /* XPATH 1.0 4.2 NYI */
XPATHFN_BOOLEAN, /* XPATH 1.0 4.3 NYI */
XPATHFN_NOT, /* XPATH 1.0 4.3 */
XPATHFN_TRUE, /* XPATH 1.0 4.3 NYI */
XPATHFN_FALSE, /* XPATH 1.0 4.3 NYI */
XPATHFN_LANG, /* XPATH 1.0 4.3 NYI */
XPATHFN_NUMBER, /* XPATH 1.0 4.4 NYI */
XPATHFN_SUM, /* XPATH 1.0 4.4 NYI */
XPATHFN_FLOOR, /* XPATH 1.0 4.4 NYI */
XPATHFN_CEILING, /* XPATH 1.0 4.4 NYI */
XPATHFN_ROUND, /* XPATH 1.0 4.4 NYI */
XPATHFN_COMMENT, /* XPATH 1.0 nodetype NYI */
XPATHFN_TEXT, /* XPATH 1.0 nodetype */
XPATHFN_PROCESSING_INSTRUCTIONS,/* XPATH 1.0 nodetype NYI */
XPATHFN_NODE, /* XPATH 1.0 nodetype */
};
/*
* Prototypes
*/
int xp_function_contains(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_fnname_str2int(char *fnname);
const char *xp_fnname_int2str(enum clixon_xpath_function code);
int xp_function_current(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_function_deref(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_function_derived_from(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, int self, xp_ctx **xrp);
int xp_function_count(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_function_name(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_function_contains(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
int xp_function_not(xp_ctx *xc, struct xpath_tree *xs, cvec *nsc, int localonly, xp_ctx **xrp);
#endif /* _CLIXON_XPATH_FUNCTION_H */