feat: add functions to suport scientific notations

influxdb_line_protocol/src/lib.rs

@@ -675,7 +675,12 @@ fn field_uinteger_value(i: &str) -> IResult<&str, u64> {
 }
 
 fn field_float_value(i: &str) -> IResult<&str, f64> {
-    let value = alt((field_float_value_with_decimal, field_float_value_no_decimal));
+    let value = alt((
+        field_float_value_with_exponential_and_decimal,
+        field_float_value_with_exponential_no_decimal,
+        field_float_value_with_decimal,
+        field_float_value_no_decimal,
+    ));
     map_fail(value, |value| {
         value.parse().context(FloatValueInvalid { value })
     })(i)
@@ -685,6 +690,22 @@ fn field_float_value_with_decimal(i: &str) -> IResult<&str, &str> {
     recognize(separated_pair(integral_value_signed, tag("."), digit1))(i)
 }
 
+fn field_float_value_with_exponential_and_decimal(i: &str) -> IResult<&str, &str> {
+    recognize(separated_pair(
+        integral_value_signed,
+        tag("."),
+        exponential_value,
+    ))(i)
+}
+
+fn field_float_value_with_exponential_no_decimal(i: &str) -> IResult<&str, &str> {
+    exponential_value(i)
+}
+
+fn exponential_value(i: &str) -> IResult<&str, &str> {
+    recognize(separated_pair(digit1, tag("e+"), digit1))(i)
+}
+
 fn field_float_value_no_decimal(i: &str) -> IResult<&str, &str> {
     integral_value_signed(i)
 }
@@ -1473,9 +1494,23 @@ mod test {
     #[test]
     fn parse_scientific_float() -> Result {
         let input = "m0 field=-1.234456e+06 1615869152385000000";
-        //let input = "m0 field=10";
+        let vals = parse(input)?;
-        let parsed = parse(input);
+        assert_eq!(vals.len(), 1);
 
+        let input = "m0 field=1.234456e+06 1615869152385000000";
+        let vals = parse(input)?;
+        assert_eq!(vals.len(), 1);
+
+        let input = "m0 field=-1.234456e06 1615869152385000000";
+        let parsed = parse(input);
+        assert!(
+            matches!(parsed, Err(super::Error::CannotParseEntireLine { .. })),
+            "Wrong error: {:?}",
+            parsed,
+        );
+
+        let input = "m0 field=1.234456e06 1615869152385000000";
+        let parsed = parse(input);
         assert!(
             matches!(parsed, Err(super::Error::CannotParseEntireLine { .. })),
             "Wrong error: {:?}",