Make the project be a workspace

meilidb-core/src/number.rs

@@ -0,0 +1,55 @@
+use std::num::{ParseIntError, ParseFloatError};
+use std::str::FromStr;
+use std::fmt;
+
+use ordered_float::OrderedFloat;
+use serde::{Serialize, Deserialize};
+
+#[derive(Serialize, Deserialize)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Number {
+    Unsigned(u64),
+    Signed(i64),
+    Float(OrderedFloat<f64>),
+}
+
+impl FromStr for Number {
+    type Err = ParseNumberError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let uint_error = match u64::from_str(s) {
+            Ok(unsigned) => return Ok(Number::Unsigned(unsigned)),
+            Err(error) => error,
+        };
+
+        let int_error = match i64::from_str(s) {
+            Ok(signed) => return Ok(Number::Signed(signed)),
+            Err(error) => error,
+        };
+
+        let float_error = match f64::from_str(s) {
+            Ok(float) => return Ok(Number::Float(OrderedFloat(float))),
+            Err(error) => error,
+        };
+
+        Err(ParseNumberError { uint_error, int_error, float_error })
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ParseNumberError {
+    uint_error: ParseIntError,
+    int_error: ParseIntError,
+    float_error: ParseFloatError,
+}
+
+impl fmt::Display for ParseNumberError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.uint_error == self.int_error {
+            write!(f, "can not parse number: {}, {}", self.uint_error, self.float_error)
+        } else {
+            write!(f, "can not parse number: {}, {}, {}",
+                self.uint_error, self.int_error, self.float_error)
+        }
+    }
+}