--- /dev/null
+/*
+ * jsonb_utilsx.c
+ * Test jsonb delete and concatenate operator functions for 9.4
+ *
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ * Author: Glyn Astill <glyn@8kb.co.uk>
+ *
+ * This is purely experimentation and will contain many errors and bad form
+ * DO NOT USE ON PRODUCTION SYSTEMS.
+ *
+ */
+
+#include "postgres.h"
+#include "utils/jsonb.h"
+#include "catalog/pg_type.h"
+#include "utils/builtins.h"
+#include "jsonb_opx.h"
+
+JsonbValue *
+pushJsonbBinary(JsonbParseState *pstate, JsonbContainer *jsonb_container)
+{
+ JsonbIterator *jsonb_iterator;
+ JsonbValue jsonb_iterator_value;
+ int32 jsonb_iterator_token;
+ JsonbValue *return_jsonb_value = NULL;
+
+ jsonb_iterator = JsonbIteratorInit((void *)jsonb_container);
+ while ((jsonb_iterator_token = JsonbIteratorNext(&jsonb_iterator, &jsonb_iterator_value, false)) != WJB_DONE)
+ {
+ return_jsonb_value = pushJsonbValue(&pstate, jsonb_iterator_token, &jsonb_iterator_value);
+ }
+ return return_jsonb_value;
+}
+
+Jsonb *
+jsonbModifyPath(Jsonb *jsonb_a, ArrayType *array_path, Jsonb *jsonb_b)
+{
+ /* pointers to return jsonb value data and state to be converted to jsonb on return */
+ JsonbParseState *state = NULL;
+ JsonbValue *return_jsonb_value = NULL;
+
+ /* pointer to iterator for input jsonb */
+ JsonbIterator *jsonb_iterator;
+ JsonbValue jsonb_iterator_value;
+ int32 jsonb_iterator_token;
+ int32 jsonb_last_token = 0;
+
+ JsonbIterator *jsonb_replacement_iterator;
+ JsonbValue jsonb_replacement_iterator_value;
+ int32 jsonb_replacement_iterator_token;
+
+ /*
+ * array element variables for use during deconstruction
+ * count is the depth we will be looking from the first matching key
+ */
+ Datum *datums;
+ bool *nulls;
+ int32 count;
+
+ /* the current key we are looking for, starting with the first key */
+ text *key_on = NULL;
+ //text *key_on;
+ int32 index_on = 0;
+ int32 nest_level = 0;
+ int32 array_level = 0;
+ int32 skip_level = 0;
+ int32 push_nest_level = 0;
+ bool push = true;
+
+ /* assert input_array is a text array type */
+ Assert(ARR_ELEMTYPE(array_path) == TEXTOID);
+
+ /* check input_array is one-dimensional */
+ if (ARR_NDIM(array_path) > 1)
+ ereport(ERROR,
+ (errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
+ errmsg("1 dimensional text array expected")));
+
+ /* deconstruct array elements */
+ deconstruct_array(array_path, TEXTOID, -1, false, 'i',
+ &datums, &nulls, &count);
+
+ /* can't follow key based paths on non objects */
+ if (!JB_ROOT_IS_OBJECT(jsonb_a) && (count > 1))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("cannot call with path deeper than 1 on a non-object")));
+
+ /* if the array is empty there's no work to do so return the input value */
+ if ((count == 0) || (JB_ROOT_COUNT(jsonb_a) == 0))
+ return jsonb_a;
+
+ if (!nulls[index_on])
+ key_on = DatumGetTextP(datums[index_on]);
+
+ jsonb_iterator = JsonbIteratorInit(&jsonb_a->root);
+
+ while ((jsonb_iterator_token = JsonbIteratorNext(&jsonb_iterator, &jsonb_iterator_value, false)) != WJB_DONE)
+ {
+ push = true;
+
+ switch (jsonb_iterator_token)
+ {
+ case WJB_BEGIN_ARRAY:
+ array_level++;
+ break;
+ case WJB_BEGIN_OBJECT:
+ nest_level++;
+ break;
+ case WJB_ELEM:
+ case WJB_KEY:
+ /*
+ * If we are not skipping the current nest level check that the nesting level follows the array index
+ * and if it does check the current key. For array elements only check the root level (array_level==1).
+ * If there is no match we just keep on pushing
+ */
+ if (skip_level == 0 && ((jsonb_iterator_token == WJB_KEY && nest_level-1 == index_on && array_level == 0) ||
+ (jsonb_iterator_token == WJB_ELEM && nest_level == 0 && array_level == 1)))
+ {
+ if ((jsonb_iterator_value.type == jbvNull && key_on == NULL) ||
+ (key_on != NULL && (jsonb_iterator_value.val.string.len == VARSIZE_ANY_EXHDR(key_on)) &&
+ (memcmp(jsonb_iterator_value.val.string.val, VARDATA_ANY(key_on), jsonb_iterator_value.val.string.len) == 0)))
+ {
+ /* if we have not yet reached the last index in the array / key chain move on and check the next */
+ if (index_on < count-1)
+ {
+ index_on++;
+ if (!nulls[index_on])
+ key_on = DatumGetTextP(datums[index_on]);
+ else
+ key_on = NULL;
+ }
+ /* if we have reached the last index, the we can modify this level */
+ else
+ {
+ /* if jsonb_b is not null unwrap it with iterator into replacement_jsonb_value */
+ if (jsonb_b != NULL) {
+ jsonb_replacement_iterator = JsonbIteratorInit(&jsonb_b->root);
+
+ while ((jsonb_replacement_iterator_token = JsonbIteratorNext(&jsonb_replacement_iterator, &jsonb_replacement_iterator_value, false)) != WJB_DONE)
+ {
+ if (((jsonb_last_token == jsonb_replacement_iterator_token) &&
+ (jsonb_last_token != WJB_VALUE)) ||
+ ((jsonb_last_token == WJB_VALUE) &&
+ ((jsonb_replacement_iterator_token == WJB_BEGIN_OBJECT) ||
+ (jsonb_replacement_iterator_token == WJB_BEGIN_ARRAY))))
+ {
+ push_nest_level++;
+ }
+
+ if ((jsonb_replacement_iterator_token == WJB_KEY) ||
+ (jsonb_replacement_iterator_token == WJB_VALUE) ||
+ (jsonb_replacement_iterator_token == WJB_ELEM) ||
+ (push_nest_level != 1))
+ {
+ return_jsonb_value = pushJsonbValue(&state, jsonb_replacement_iterator_token, &jsonb_replacement_iterator_value);
+ }
+
+ if (((jsonb_last_token == WJB_BEGIN_ARRAY) ||
+ (jsonb_last_token == WJB_VALUE)) &&
+ (jsonb_replacement_iterator_token == WJB_END_ARRAY))
+ {
+ push_nest_level--;
+ }
+ else if (((jsonb_last_token == WJB_BEGIN_OBJECT) ||
+ (jsonb_last_token == WJB_VALUE)) &&
+ (jsonb_replacement_iterator_token == WJB_END_OBJECT))
+ {
+ push_nest_level--;
+ }
+ }
+ }
+ if (jsonb_iterator_token == WJB_ELEM)
+ push = false;
+ else
+ skip_level = nest_level;
+ }
+ }
+ }
+ }
+
+ if (push && (skip_level == 0 || nest_level < skip_level))
+ {
+ return_jsonb_value = pushJsonbValue(&state, jsonb_iterator_token, &jsonb_iterator_value);
+ jsonb_last_token = jsonb_iterator_token;
+ }
+
+ switch (jsonb_iterator_token)
+ {
+ case WJB_END_OBJECT:
+ nest_level--;
+ if (skip_level == nest_level && array_level == 0)
+ skip_level = 0;
+ break;
+ case WJB_END_ARRAY:
+ array_level--;
+ if (skip_level == nest_level && array_level == 0)
+ skip_level = 0;
+ break;
+ case WJB_VALUE:
+ if (skip_level == nest_level)
+ skip_level = 0;
+ }
+ }
+
+ return JsonbValueToJsonb(return_jsonb_value);
+}
projects / postgresql / pg_jsonb_opx / blobdiff