Add the FromStr

components/plurals/src/operands.rs

@@ -70,6 +70,7 @@ pub struct PluralOperands {
     pub f: u64,
     /// Visible fraction digits without trailing zeros
     pub t: u64,
+    /// Exponent
     pub e: usize,
 }
 
@@ -103,6 +104,15 @@ impl From<IOError> for OperandsError {
     }
 }
 
+fn get_exponent(input: &str) -> Result<(&str, usize), OperandsError> {
+    if let Some(e_idx) = input.find('e') {
+        let e = usize::from_str(&input[e_idx + 1..])?;
+        Ok((&input[..e_idx], e))
+    } else {
+        Ok((input, 0))
+    }
+}
+
 impl FromStr for PluralOperands {
     type Err = OperandsError;
 
@@ -119,9 +129,10 @@ impl FromStr for PluralOperands {
             num_fraction_digits,
             fraction_digits0,
             fraction_digits,
+            exponent,
         ) = if let Some(sep_idx) = abs_str.find('.') {
             let int_str = &abs_str[..sep_idx];
-            let dec_str = &abs_str[(sep_idx + 1)..];
+            let (dec_str, exponent) = get_exponent(&abs_str[(sep_idx + 1)..])?;
 
             let integer_digits = u64::from_str(int_str)?;
 
@@ -144,10 +155,12 @@ impl FromStr for PluralOperands {
                 num_fraction_digits,
                 fraction_digits0,
                 fraction_digits,
+                exponent,
             )
         } else {
+            let (abs_str, exponent) = get_exponent(abs_str)?;
             let integer_digits = u64::from_str(abs_str)?;
-            (integer_digits, 0, 0, 0, 0)
+            (integer_digits, 0, 0, 0, 0, exponent)
         };
 
         Ok(Self {
@@ -156,7 +169,7 @@ impl FromStr for PluralOperands {
             w: num_fraction_digits,
             f: fraction_digits0,
             t: fraction_digits,
-            e: 0,
+            e: exponent,
         })
     }
 }

components/plurals/tests/fixtures/operands.json

@@ -55,6 +55,14 @@
     {
       "input": "2.0",
       "output": [2, 2, 1, 0, 0, 0, 0]
+    },
+    {
+      "input": "2e3",
+      "output": [2, 2, 0, 0, 0, 0, 3]
+    },
+    {
+      "input": "2.0e12",
+      "output": [2, 2, 1, 0, 0, 0, 12]
     }
   ],
   "int": [