From b6391d55f80c8c40717f5f3913b8f20a24b36edb Mon Sep 17 00:00:00 2001
From: Blendi <blendi@codersquack.nl>
Date: Mon, 20 Apr 2026 20:48:52 +0200
Subject: [PATCH] lexer: hex literal floats and exponents

---
 src/lexer.c | 37 ++++++++++++++++++++++++++++++++++++-
 src/main.c  |  4 ++--
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/src/lexer.c b/src/lexer.c
index a28be50..25cb142 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -92,11 +92,46 @@ noom_uint_t noomL_getnumber(const char* s, noomL_ErrorType* error, noom_LuaVersi
 			len++;
 		}
 
+		if (version >= NOOM_VERSION_52) { // 5.2 added exponent and decimal to hex literals.
+
+			if (s[len] == '.') { // decimals in hex. smh.
+				len++;
+
+				while (noomL_ishex(s[len])) {
+					len++;
+				}
+
+				if (len == 3) { // only 0x. is a malformed number, even if followed by an exponent
+					*error = NOOML_ERROR_MALFORMED_NUM;
+					return 0;
+				}
+			}
+
+			if (noomL_lower(s[len]) == 'p') {
+				len++;
+
+				// sign for exponent
+				if (s[len] == '-' || s[len] == '+') len++;
+
+				noom_uint_t slen = len;
+
+				while (noomL_ishex(s[len])) {
+					len++;
+				}
+
+				if (slen == len) { // nothing after `p`
+					*error = NOOML_ERROR_MALFORMED_NUM;
+					return 0;
+				}
+			}
+			
+		}
+
 		if (len == 2) { // nothing after the x; malformed number.
 			*error = NOOML_ERROR_MALFORMED_NUM;
 			return 0;
 		}
-
+		
 		return len;
 	} else {
 		while (noomL_isnumber(s[len])) { // int part
diff --git a/src/main.c b/src/main.c
index c5ba517..1582e5f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -33,14 +33,14 @@ void print_node(noomP_Node* node, noom_uint_t depth) {
 
 int main(int argc, char** argv) {
 	// uhh uhhh uhhhhh
-	const char* code = "local a = 0xff + 5e-2 + .1e2";
+	const char* code = "local a = 0x0.1E";
 	noom_uint_t pos = 0;
 
 	printf("LEX OUTPUT:\n");
 
 	noomL_Token token;
 	while (1) {
-		noomL_lex(code, pos, &token, NOOM_VERSION_51);
+		noomL_lex(code, pos, &token, NOOM_VERSION_54);
 
 		printf("%s ", noomL_formatTokenType(token.type));
 		for (noom_uint_t i = 0; i < token.length; i++) putchar((code + token.offset)[i]);