Serialise.c

// This article and all its includes are licenced under LGPL // http://www.gnu.org/copyleft/lesser.html // - used for storing and communicating nodal structure as plain text // - rather than XML we've used a simple wiki-link format for easy human editing

// Process passed string of pipe-separated names (ext GUID's are just alias's) // - returns index of a newly created internal node to which the passed names map // - returns index as item not node because nodal storage functions are active // - later: if its a number, convert to a binary-coded-string of \x00's and \x01's item processNodeNames(char *link) { node subject = (node)listInsert(); char **links = split('|',link); int i = 0; while (links[i]) { trieSetValue(links[i++],subject); // need to store name as nodal attribute of node too } // these are crashing... // free(links[0]); // free the separate string items // free(links); // and the pointers to them return subject; }

// Convert a node to text for storage or transport // - needs to do a binary traversal into the passed node to build association list char *serialise(node subject) { char *text; item **keys = listGetKeys((item)subject); while (**keys++) { // add returned key info as text } return text; }

// Convert textual represntation of one or more nodes and associations to nodal change void deserialise(char *text) { printf("\nPARSING THE FOLLOWING TEXT:\n--------------------------------------------\n%s\n--------------------------------------------\n\n", text); printf("INFORMATION EXTRACTED:\n--------------------------------------------\n"); item subject = 0; int key, val, i, j = 0, linkStart; char *link1 = malloc(100), *link2 = link1+50; for (i = 0; i < strlen(text); i++) { char *s = text+i; if (*s < 32) j = 1; else switch (j) { case 1: // starting new line - if not starting with *[[ then wait for next line if (strncmp(s,"*[[",3) == 0) { j = 2; linkStart = i+3; } else j = 0; break; case 2: // processing first link if (strncmp(s,"]]",2) == 0) { if (strncmp(s,"]];",3) == 0) j=4; // done link 1 of n (loop) if (strncmp(s,"]]:[[",5) == 0) j=3; // done link 1 of 2 (assoc) else { // done link 1 of 1 (context) strncpy(link1, text+linkStart, i-linkStart); link1[i-linkStart] = '\0'; subject = processNodeNames(link1); printf("%d...\n", subject); j = 0; // wait for new line } } break; case 3: // processing link 2 of an association statement if (strncmp(s, "]]", 2) == 0) { strncpy(link1, text+linkStart, i-linkStart); link2 = strchr(link1, '[')+2; link1[i-linkStart] = '\0'; link1[i-linkStart-strlen(link2)-5] = '\0'; key = processNodeNames(link1); val = processNodeNames(link2); listSetValue(listTraverse(subject,key),val); printf("\t%d : %d\n", key, val); j = 0; } break; case 4: // processing link n of a loop statement if (strncmp(s, "[[", 2) == 0) linkStart = i+2; if (strncmp(s, "]]", 2) == 0) { strncpy(link1, text+linkStart, i-linkStart); link1[i-linkStart] = '\0'; nodeLoopInsert(subject,processNodeNames(link1)); if (strncmp(s, "]];[[", 5) != 0) { printf("\n"); j = 0; } printf("\t%d ; ", subject); } break; } } free(link1); printf("--------------------------------------------\n"); }