handle minimum_integer_digits and maximum_significant_digits

fluent-bundle/src/types/number.rs

@@ -167,12 +167,20 @@ impl FluentNumber {
     }
 
     fn as_fixed_decimal(&self) -> FixedDecimal {
-        let mut fixed_decimal =
-            FixedDecimal::try_from_f64(self.value, DoublePrecision::Floating).unwrap();
+        let precision = if let Some(maxsd) = self.options.maximum_significant_digits {
+            DoublePrecision::SignificantDigits(maxsd as u8)
+        } else {
+            DoublePrecision::Floating
+        };
+
+        let mut fixed_decimal = FixedDecimal::try_from_f64(self.value, precision).unwrap();
 
         if let Some(minfd) = self.options.minimum_fraction_digits {
             fixed_decimal.pad_end(-(minfd as i16));
         }
+        if let Some(minid) = self.options.minimum_integer_digits {
+            fixed_decimal.pad_start(minid as i16);
+        }
         fixed_decimal
     }
 

fluent-bundle/tests/types_test.rs

@@ -126,16 +126,34 @@ fn fluent_number_style() {
     let num = FluentNumber::new(0.2, FluentNumberOptions::default());
     assert_eq!(num.as_string_basic(), "0.2");
 
-    let opts = FluentNumberOptions {
+    let mut opts = FluentNumberOptions {
         minimum_fraction_digits: Some(3),
         ..Default::default()
     };
 
     let num = FluentNumber::new(0.2, opts.clone());
     assert_eq!(num.as_string_basic(), "0.200");
 
-    let num = FluentNumber::new(2.0, opts);
+    let num = FluentNumber::new(2.0, opts.clone());
     assert_eq!(num.as_string_basic(), "2.000");
+
+    opts.minimum_integer_digits = Some(3);
+    opts.minimum_fraction_digits = None;
+
+    let num = FluentNumber::new(2.0, opts.clone());
+    assert_eq!(num.as_string_basic(), "002");
+
+    let num = FluentNumber::new(0.2, opts.clone());
+    assert_eq!(num.as_string_basic(), "000.2");
+
+    opts.minimum_integer_digits = None;
+    opts.maximum_significant_digits = Some(4);
+
+    let num = FluentNumber::new(12345.0, opts.clone());
+    assert_eq!(num.as_string_basic(), "12340");
+
+    let num = FluentNumber::new(1.2345, opts);
+    assert_eq!(num.as_string_basic(), "1.234");
 }
 
 #[test]