From 81fe18e7a966b96a238e971d0179744fb2ae63fe Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 22 Apr 2025 13:34:41 +0200
Subject: Leading zero is annoying. I need a proper floating point decoder

---
 modules/codec-json/c++/json.tmpl.hpp | 44 ++++++++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/modules/codec-json/c++/json.tmpl.hpp b/modules/codec-json/c++/json.tmpl.hpp
index 51ee3c3..039f066 100644
--- a/modules/codec-json/c++/json.tmpl.hpp
+++ b/modules/codec-json/c++/json.tmpl.hpp
@@ -505,14 +505,32 @@ struct json_decode<schema::Primitive<T,N>, ToDecode> {
 		if (offset >= buff.read_composite_length()) {
 			return make_error<err::buffer_exhausted>();
 		}
-		if (buff.read(offset) >= '1' && buff.read(offset) <= '9') {
+		/**
+		 *  In case of integers it's at least 1. Hacky float
+		 */
+		if (buff.read(offset) >= '0' && buff.read(offset) <= '9') {
+			bool leading_zero = (buff.read(offset) == '0');
 			++offset;
 
+			bool do_loop = true;
 			if(offset >= buff.read_composite_length()) {
-				return make_error<err::buffer_exhausted>();
+				if(!leading_zero){
+					return make_error<err::buffer_exhausted>();
+				}else{
+					do_loop = false;
+				}
+			}
+
+			/**
+			 * Hacky setup for float check
+			 */
+			if(do_loop && leading_zero){
+				if(buff.read(offset) != '.'){
+					return make_error<err::invalid_state>("Leading zero, but no '.' afterwards");
+				}
 			}
 
-			while(1){
+			while(do_loop){
 				if (buff.read(offset) >= '0' && buff.read(offset) <= '9') {
 					++offset;
 
@@ -533,9 +551,13 @@ struct json_decode<schema::Primitive<T,N>, ToDecode> {
 				}
 				break;
 			}
-		} else if (buff.read(offset) == '0' ) {
+		}
+		/* Case
+		else if (buff.read(offset) == '0' ) {
 			++offset;
-		} else {
+		}
+		*/
+		else {
 			return make_error<err::buffer_exhausted>();
 		}
 
@@ -700,6 +722,9 @@ struct json_decode<schema::Struct<schema::Member<T,Lits>...>, ToDecode> {
 
 	static error_or<void> decode_fields(buffer_view& buff, data<Schema, ToDecode>& to, std::array<bool, sizeof...(T)>& fields){
 		for(;;){
+			/**
+			 * Decode the member name/key
+			 */
 			data<schema::String, ToDecode> name;
 			auto eov = json_decode<schema::String, ToDecode>::decode(buff, name);
 			if(eov.is_error()){
@@ -709,6 +734,9 @@ struct json_decode<schema::Struct<schema::Member<T,Lits>...>, ToDecode> {
 			if(buff.read_composite_length() == 0){
 				return make_error<err::buffer_exhausted>();
 			}
+			/**
+			 * Check the separator
+			 */
 			if(buff.read() != ':'){
 				return make_error<err::invalid_state>("Field separator in Struct expected");
 			}
@@ -717,6 +745,9 @@ struct json_decode<schema::Struct<schema::Member<T,Lits>...>, ToDecode> {
 			if(buff.read_composite_length() == 0){
 				return make_error<err::buffer_exhausted>();
 			}
+			/**
+			 * Decode the field value
+			 */
 			{
 				auto eov = decode_field_search<0>(buff, to, fields, name);
 				if(eov.is_error()){
@@ -727,6 +758,9 @@ struct json_decode<schema::Struct<schema::Member<T,Lits>...>, ToDecode> {
 			if(buff.read_composite_length() == 0){
 				return make_error<err::buffer_exhausted>();
 			}
+			/**
+			 * Advance to the next member or end of the struct
+			 */
 			if(buff.read() == ','){
 				buff.read_advance(1);
 			}else if(buff.read() == '}'){
-- 
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