lejp: E implies float

Since eg, 1e-3 is a float without needing a decimal point, let's just
generally take it that anything with the exponent token is a float, ie, 1e3
is also a float despite it can be expressed as an integer.

This seems right also because E is itself not valid in an integer.

#3308

lib/misc/lejp.c

@@ -617,7 +617,8 @@ lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len)
 			}
 
 			ctx->buf[ctx->npos] = '\0';
-			if (ctx->f & LEJP_SEEN_POINT) {
+			if (ctx->f & (LEJP_SEEN_POINT | LEJP_SEEN_EXP)) {
+				/* 0.001 or 1E-3 are both floats, take 1E3 as float too */
 				if (ctx->pst[ctx->pst_sp].callback(ctx,
 							LEJPCB_VAL_NUM_FLOAT))
 					goto reject_callback;

minimal-examples-lowlevel/api-tests/api-test-lejp/main.c

@@ -137,6 +137,10 @@ static const char * const json_tests[] = {
 	"{" /* test 12: test 11 but done with LEJP_FLAG_FEAT_OBJECT_INDEXES  */
 		"\"array1\": [[\"a\", \"b\", \"b1\"], [\"c\", \"d\", \"d1\"]],"
 		"\"array2\": [[\"e\", \"f\", \"f1\"], [\"g\", \"h\", \"h1\"]]"
+	"}",
+
+	"{" /* test 13: float vs int */
+		"\"a\": 1, \"b\": 1.0, \"c\": 1e-3, \"d\": 1e3"
 	"}"
 };
 
@@ -438,6 +442,20 @@ static struct lejp_results {
 	{ 15, 1, 2, { 1,  }, "array2[]", "h1" },
 	{ 17, 1, 0, { 1, }, "array2[]", "h1" },
 	{ 3, 1, 0, { 1,  }, "array2[]", "h1" },
+}, r13[] = {
+	{ 0, 0, 0, {  }, "", "h1" },
+	{ 2, 0, 0, {  }, "", "h1" },
+	{ 16, 0, 0, { 0,  }, "", "h1" },
+	{ 5, 0, 0, { 0,  }, "a", "h1" },
+	{ 73, 0, 0, { 0,  }, "a", "1" },
+	{ 5, 0, 0, { 1,  }, "b", "1" },
+	{ 74, 0, 0, { 1,  }, "b", "1.0" },
+	{ 5, 0, 0, { 2,  }, "c", "1.0" },
+	{ 74, 0, 0, { 2,  }, "c", "1e-3" },
+	{ 5, 0, 0, { 3,  }, "d", "1e-3" },
+	{ 74, 0, 0, { 3,  }, "d", "1e3" },
+	{ 17, 0, 0, { 3,  }, "d", "1e3" },
+	{ 3, 0, 0, { 3,  }, "d", "1e3" },
 };
 
 static const char * const tok[] = {
@@ -469,6 +487,7 @@ struct lejp_results_pkg {
 	{ r12, LWS_ARRAY_SIZE(r12), tok_test11, LWS_ARRAY_SIZE(tok_test11),
 			LEJP_FLAG_FEAT_LEADING_WC |
 			LEJP_FLAG_FEAT_OBJECT_INDEXES },
+	{ r13, LWS_ARRAY_SIZE(r13), tok, LWS_ARRAY_SIZE(tok), 0 },
 };