Re: [PATCH v2] json_writer: new routines to create data in JSON format

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On 3/23/2018 4:11 PM, René Scharfe wrote:
Am 23.03.2018 um 20:55 schrieb Jeff Hostetler:
+struct json_writer_level
+{
+    unsigned level_is_array : 1;
+    unsigned level_is_empty : 1;
+};
+
+struct json_writer
+{
+    struct json_writer_level *levels;
+    int nr, alloc;
+    struct strbuf json;
+};

A simpler and probably more compact representation of is_array would
be a strbuf with one char per level, e.g. '[' for an array and '{'
for an object (or ']' and '}').

I don't understand the need to track emptiness per level.  Only the
top level array/object can ever be empty, can it?

My expectation was that any sub-object or sub-array could be empty.
That is, this should be valid (and the JSON parser in Python allows):

      {"a":{}, "b":[], "c":[[]], "d":[{}]}

Sure, but the emptiness of finished arrays and objects doesn't matter
for the purposes of error checking, comma setting or closing.  At most
one of them is empty *and* unclosed while writing the overall JSON
object -- the last one opened:

	{
	{"a":{
	{"a":{}, "b":[
	{"a":{}, "b":[], "c":[
	{"a":{}, "b":[], "c":[[
	{"a":{}, "b":[], "c":[[]], "d":[
	{"a":{}, "b":[], "c":[[]], "d":[{

Any of the earlier written arrays/objects are either closed or contain
at least a half-done sub-array/object, which makes them non-empty.

René


good point.  i'll revisit.  thanks.
Jeff



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