Add SQL/JSON parsing

Author: Nikita Glukhov

src/backend/nodes/makefuncs.c

@@ -20,6 +20,7 @@
 #include "fmgr.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
+#include "utils/errcodes.h"
 #include "utils/lsyscache.h"
 
 
@@ -611,3 +612,87 @@ makeGroupingSet(GroupingSetKind kind, List *content, int location)
 	n->location = location;
 	return n;
 }
+
+/*
+ * makeJsonValueExpr -
+ *	  creates a JsonValueExpr node
+ */
+JsonValueExpr *
+makeJsonValueExpr(Expr *expr, JsonFormat format)
+{
+	JsonValueExpr *jve = makeNode(JsonValueExpr);
+
+	jve->expr = expr;
+	jve->format = format;
+
+	return jve;
+}
+
+/*
+ * makeJsonBehavior -
+ *	  creates a JsonBehavior node
+ */
+JsonBehavior *
+makeJsonBehavior(JsonBehaviorType type, Node *default_expr)
+{
+	JsonBehavior *behavior = makeNode(JsonBehavior);
+
+	behavior->btype = type;
+	behavior->default_expr = default_expr;
+
+	return behavior;
+}
+
+/*
+ * makeJsonEncoding -
+ *	  converts JSON encoding name to enum JsonEncoding
+ */
+JsonEncoding
+makeJsonEncoding(char *name)
+{
+	if (!pg_strcasecmp(name, "utf8"))
+		return JS_ENC_UTF8;
+	if (!pg_strcasecmp(name, "utf16"))
+		return JS_ENC_UTF16;
+	if (!pg_strcasecmp(name, "utf32"))
+		return JS_ENC_UTF32;
+
+	ereport(ERROR,
+			(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+			 errmsg("unrecognized JSON encoding: %s", name)));
+
+	return JS_ENC_DEFAULT;
+}
+
+/*
+ * makeJsonKeyValue -
+ *	  creates a JsonKeyValue node
+ */
+Node *
+makeJsonKeyValue(Node *key, Node *value)
+{
+	JsonKeyValue *n = makeNode(JsonKeyValue);
+
+	n->key = (Expr *) key;
+	n->value = castNode(JsonValueExpr, value);
+
+	return (Node *) n;
+}
+
+/*
+ * makeJsonIsPredicate -
+ *	  creates a JsonIsPredicate node
+ */
+Node *
+makeJsonIsPredicate(Node *expr, JsonFormat format, JsonValueType vtype,
+					bool unique_keys)
+{
+	JsonIsPredicate *n = makeNode(JsonIsPredicate);
+
+	n->expr = expr;
+	n->format = format;
+	n->vtype = vtype;
+	n->unique_keys = unique_keys;
+
+	return (Node *) n;
+}