Added simple scientific units

packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy

@@ -264,6 +264,9 @@ basicLiteral
 identifier 'identifier'
   = ([_a-z]+[_a-z0-9]i*) {return nodeIdentifier(text())} 
 
+unitIdentifier 'identifier'
+  = ([_a-zA-Z]+[_a-z0-9]i*) {return nodeIdentifier(text())} 
+
 dollarIdentifier '$identifier'
   = ([\$_a-z]+[\$_a-z0-9]i*) {return nodeIdentifier(text())} 
 
@@ -271,7 +274,7 @@ string 'string'
   = characters:("'" @([^'])* "'") {return nodeString(characters.join(''))} 
   / characters:('"' @([^"])* '"') {return nodeString(characters.join(''))}
 
-number = number:(float / integer) unit:identifier?
+number = number:(float / integer) unit:unitIdentifier?
   { 
     if (unit === null)
       { return number }

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_DateTime.res

@@ -26,10 +26,45 @@ let dateDispatch = (call: EV.functionCall, _: DistributionOperation.env): option
   }
 }
 
+module ScientificUnit = {
+  let nameToMultiplier = str =>
+    switch str {
+    | "n" => Some(1E-9)
+    | "m" => Some(1E-3)
+    | "k" => Some(1E3)
+    | "M" => Some(1E6)
+    | "B" => Some(1E9)
+    | "G" => Some(1E9)
+    | "T" => Some(1E12)
+    | "P" => Some(1E15)
+    | _ => None
+    }
+
+  let getMultiplier = (r: string) => {
+    let match = Js.String2.match_(r, %re(`/fromUnit_([_a-zA-Z]*)/`))
+    switch match {
+    | Some([_, unit]) => nameToMultiplier(unit)
+    | _ => None
+    }
+  }
+}
+
 let durationDispatch = (call: EV.functionCall, _: DistributionOperation.env): option<
   result<expressionValue, QuriSquiggleLang.Reducer_ErrorValue.errorValue>,
 > => {
   switch call {
+  | (
+      ("fromUnit_n"
+      | "fromUnit_m"
+      | "fromUnit_k"
+      | "fromUnit_M"
+      | "fromUnit_B"
+      | "fromUnit_G"
+      | "fromUnit_T"
+      | "fromUnit_P") as op,
+      [EvNumber(f)],
+    ) =>
+    op->ScientificUnit.getMultiplier->E.O2.fmap(multiplier => EV.EvNumber(f *. multiplier)->Ok)
   | ("toString", [EvTimeDuration(t)]) => EV.EvString(DateTime.Duration.toString(t))->Ok->Some
   | ("minutes", [EvNumber(f)]) => EV.EvTimeDuration(DateTime.Duration.fromMinutes(f))->Ok->Some
   | ("fromUnit_minutes", [EvNumber(f)]) =>