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/* Copyright 2018-2018 University Corporation for Atmospheric Research/Unidata. */
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <libxml2/libxml/parser.h>
#include <libxml/tree.h>
#include "ncxml.h"
#ifndef nulldup
#define nulldup(s) ((s)?strdup(s):NULL)
#endif
static int ncxml_initialized = 0;
void
ncxml_initialize(void)
{
ncxml_initialized = 1;
}
void
ncxml_finalize(void)
{
ncxml_initialized = 0;
xmlCleanupParser();
}
ncxml_doc_t
ncxml_parse(char* contents, size_t len)
{
xmlDocPtr doc; /* the resulting document tree */
doc = xmlReadMemory(contents, (int)len, "dap4.xml", NULL, 0);
return (ncxml_doc_t)doc;
}
void
ncxml_free(ncxml_doc_t doc0)
{
xmlDoc *doc = (xmlDoc*)doc0;
xmlFreeDoc(doc);
}
ncxml_t
ncxml_root(ncxml_doc_t doc0)
{
xmlDoc *doc = (xmlDoc*)doc0;
return (ncxml_t)xmlDocGetRootElement(doc);
}
const char*
ncxml_name(ncxml_t xml0)
{
xmlNode* xml = (xmlNode*)xml0;
return (const char*)(xml?xml->name:NULL);
}
char*
ncxml_attr(ncxml_t xml0, const char* key)
{
xmlNode* xml = (xmlNode*)xml0;
xmlChar* value = NULL;
char* s = NULL;
value = xmlGetProp(xml,(const xmlChar*)key);
s = nulldup((char*)value);
xmlFree(value);
return s;
}
/* First child by name */
ncxml_t
ncxml_child(ncxml_t xml0, const char* name)
{
xmlNode* xml = (xmlNode*)xml0;
xmlNode* child = NULL;
for(child=xml->children;child; child = child->next) {
if(child->type == XML_ELEMENT_NODE && strcmp((const char*)child->name,name)==0)
return (ncxml_t)child;
}
return NULL;
}
ncxml_t
ncxml_next(ncxml_t xml0, const char* name)
{
xmlNode* xml = (xmlNode*)xml0;
xmlNode* next = NULL;
for(next=xml->next;next; next = next->next) {
if(next->type == XML_ELEMENT_NODE && strcmp((const char*)next->name,name)==0)
return (ncxml_t)next;
}
return NULL;
}
char*
ncxml_text(ncxml_t xml0)
{
xmlNode* xml = (xmlNode*)xml0;
xmlChar* txt = NULL;
char* s = NULL;
if(xml == NULL) return NULL;
txt = xmlNodeGetContent(xml);
s = nulldup((char*)txt);
xmlFree(txt);
return s;
}
/* Nameless versions of child and next */
ncxml_t
ncxml_child_first(ncxml_t xml0)
{
xmlNode* xml = (xmlNode*)xml0;
xmlNode* child = NULL;
if(xml == NULL) return NULL;
for(child=xml->children;child; child = child->next) {
if(child->type == XML_ELEMENT_NODE) return child;
}
return NULL;
}
ncxml_t
ncxml_child_next(ncxml_t xml0)
{
xmlNode* xml = (xmlNode*)xml0;
if(xml == NULL) return NULL;
for(xml=xml->next;xml; xml = xml->next) {
if(xml->type == XML_ELEMENT_NODE) return xml;
}
return NULL;
}
int
ncxml_attr_pairs(ncxml_t xml0, char*** pairsp)
{
char** pairs = NULL;
xmlNode* xml = (xmlNode*)xml0;
xmlAttr* attr = NULL;
int i;
size_t count = 0;
if(xml == NULL) return 0;
/* First count */
for(attr=xml->properties;attr;attr=attr->next) count++;
/* Allocate */
pairs = (char**)malloc(sizeof(char*)*((2*count)+1));
if(pairs == NULL) return 0;
/* Collect */
for(i=0,attr=xml->properties;attr;i+=2,attr=attr->next) {
xmlChar* value;
pairs[i] = nulldup((char*)attr->name);
value = xmlNodeListGetString(xml->doc, attr->children, 1);
pairs[i+1] = nulldup((char*)value);
xmlFree(value);
}
pairs[2*count] = NULL;
if(pairsp) *pairsp = pairs;
return 1;
}
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