--- /dev/null
+/*
+ * Copyright (c) 1995-1999, Index Data.
+ * See the file LICENSE for details.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * d1_if.c : A simple interface for extracting strings from data1_node tree structures
+ *
+ * $Log: d1_if.c,v $
+ * Revision 1.1 1999-12-21 14:16:19 ian
+ * Changed retrieval module to allow data1 trees with no associated absyn.
+ * Also added a simple interface for extracting values from data1 trees using
+ * a string based tagpath.
+ *
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <yaz/data1.h>
+#include <yaz/log.h>
+
+#include <string.h>
+
+
+/*
+ * Search for a token in the supplied string up to the supplied list of stop characters or EOL
+ * At the end, return the character causing the break and fill pTokenBuffer with the token string so far
+ * After the scan, *pPosInBuffer will point to the next character after the one causing the break and
+ * pTokenBuffer will contain the actual token
+ */
+char data1_ScanNextToken(char* pBuffer,
+ char** pPosInBuffer,
+ char* pBreakChars,
+ char* pWhitespaceChars,
+ char* pTokenBuffer)
+{
+ char* pBuff = pTokenBuffer;
+ *pBuff = '\0';
+
+ while ( **pPosInBuffer )
+ {
+ if ( strchr(pBreakChars,**pPosInBuffer) != NULL )
+ {
+ /* Current character is a break character */
+ *pBuff++ = '\0';
+ return *((*pPosInBuffer)++);
+ }
+ else
+ {
+ if ( strchr(pWhitespaceChars, **pPosInBuffer) != NULL )
+ *pPosInBuffer++;
+ else
+ *pBuff++ = *((*pPosInBuffer)++);
+ }
+ }
+
+ *pBuff++ = *((*pPosInBuffer)++);
+ return(**pPosInBuffer);
+}
+
+/*
+ * Attempt to find a string value given the specified tagpath
+ *
+ * Need to make this safe by passing in a buffer.....
+ *
+ */
+char *data1_getNodeValue(data1_node* node, char* pTagPath)
+{
+ data1_node* n = NULL;
+
+ n = data1_LookupNode(node, pTagPath );
+
+ if ( n )
+ {
+ /* n should be a tag node with some data under it.... */
+ if ( n->child )
+ {
+ if ( n->child->which == DATA1N_data )
+ {
+ return n->child->u.data.data;
+ }
+ else
+ {
+ yaz_log(LOG_WARN,"Attempting to lookup data for tagpath: Child node is not a data node");
+ }
+ }
+ else
+ {
+ yaz_log(LOG_WARN,"Found a node matching the tagpath, but it has no child data nodes");
+ }
+ }
+ else
+ {
+ yaz_log(LOG_WARN,"Unable to lookup a node on the specified tag path");
+ }
+
+ return "";
+}
+
+
+/*
+ * data1_LookupNode : Try and find a node as specified by a tagpath
+ */
+data1_node *data1_LookupNode(data1_node* node, char* pTagPath)
+{
+ /* Node matching the pattern in the tagpath */
+ data1_node* matched_node = NULL;
+
+ /* Current Child node as we search for nodes matching the pattern in the tagpath */
+ data1_node* current_child = node->child;
+
+ /* Max length of a tag */
+ int iMaxTagSize=50;
+
+ /* Current position in string */
+ char* pCurrCharInPath = pTagPath;
+
+ /* Work buffer */
+ char Buffer[iMaxTagSize];
+
+ /* The tag type of this node */
+ int iTagType = 0;
+
+ /* for non string tags, the tag value */
+ int iTagValue = 0;
+
+ /* for string tags, the tag value */
+ char StringTagVal[iMaxTagSize];
+
+ /* Which occurence of that tag under this node */
+ int iOccurences=0;
+
+ /* Character causing a break */
+ char sepchr = '\0';
+ Buffer[0] = '\0';
+ StringTagVal[0] = '\0';
+
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, ",[(."," ", Buffer);
+
+ if ( sepchr == '[' )
+ {
+ /* Next component in node value is [ TagType, TagVal, TagOccurence ] */
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, ","," ", Buffer);
+ iTagType = atoi(Buffer);
+
+ /* Occurence is optional... */
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, ",]."," ", Buffer);
+
+ if ( iTagType == 3 )
+ strcpy(StringTagVal,Buffer);
+ else
+ iTagValue = atoi(Buffer);
+
+ /* If sepchar was a ',' there should be an instance */
+ if ( sepchr == ',' )
+ {
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, "]."," ", Buffer);
+ iOccurences = atoi(Buffer);
+ }
+
+ if ( sepchr == ']' )
+ {
+ /* See if we can scan the . for the next component or the end of the line... */
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, "."," ", Buffer);
+ }
+ else
+ {
+ yaz_log(LOG_FATAL,"Node does not end with a ]");
+ /* Fatal Error */
+ return(NULL);
+ }
+ }
+ else
+ {
+ /* We have a TagName so Read up to ( or . or EOL */
+ iTagType = 3;
+ strcpy(StringTagVal,Buffer);
+
+ if ( sepchr == '(' )
+ {
+ /* Read the occurence */
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, ")"," ", Buffer);
+ iOccurences = atoi(Buffer);
+
+ /* See if we can find the . at the end of this clause */
+ sepchr = data1_ScanNextToken(pTagPath, &pCurrCharInPath, "."," ", Buffer);
+ }
+
+ }
+
+ yaz_log(LOG_DEBUG,"search node for child like [%d,%d,%s,%d]",iTagType,iTagValue,StringTagVal,iOccurences);
+
+
+ /* OK.. We have extracted tagtype, Value and Occurence, see if we can find a node */
+ /* Under the current parent matching that description */
+
+ while ( ( current_child ) && ( matched_node == NULL ) )
+ {
+ if ( current_child->which == DATA1N_tag )
+ {
+ if ( iTagType == 3 )
+ {
+ if ( ( current_child->u.tag.element == NULL ) &&
+ ( strcmp(current_child->u.tag.tag, StringTagVal) == 0 ) )
+ {
+ if ( iOccurences )
+ {
+ // Everything matched, but not yet found the right occurence of the given tag
+ iOccurences--;
+ }
+ else
+ {
+ /* We have matched a string tag... Is there more to process? */
+ matched_node = current_child;
+ }
+ }
+ }
+ else /* Attempt to match real element */
+ {
+ yaz_log(LOG_WARN,"Non string tag matching not yet implemented");
+ }
+ }
+ current_child = current_child->next;
+ }
+
+
+ /* If there is more... Continue */
+ if ( ( sepchr == '.' ) && ( matched_node ) )
+ {
+ return data1_LookupNode(matched_node, pCurrCharInPath);
+ }
+ else
+ {
+ return matched_node;
+ }
+}
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