Moved matching functionality to dedicated module

packages/squiggle-lang/src/rescript/FunctionRegistry.res

@@ -56,7 +56,8 @@ let rec matchInput = (input: itype, r: expressionValue): option<value> =>
   | _ => None
   }
 
-module MatchSimple = {
+module Matcher = {
+  module MatchSimple = {
     type t = DifferentName | SameNameDifferentArguments | FullMatch
 
     let isFullMatch = (match: t) =>
@@ -70,9 +71,9 @@ module MatchSimple = {
       | SameNameDifferentArguments => true
       | _ => false
       }
-}
+  }
 
-module Match = {
+  module Match = {
     type t<'a, 'b> = DifferentName | SameNameDifferentArguments('a) | FullMatch('b)
 
     let isFullMatch = (match: t<'a, 'b>): bool =>
@@ -86,9 +87,9 @@ module Match = {
       | SameNameDifferentArguments(_) => true
       | _ => false
       }
-}
+  }
 
-module FnDefinition = {
+  module FnDefinition = {
     type definitionMatch = MatchSimple.t
 
     let getArgValues = (f: fnDefinition, args: array<expressionValue>): option<array<value>> => {
@@ -116,31 +117,12 @@ module FnDefinition = {
         matchAssumingSameName(f, args)
       }
     }
-
-  let run = (f: fnDefinition, args: array<expressionValue>) => {
-    let argValues = getArgValues(f, args)
-    switch argValues {
-    | Some(values) => f.run(values)
-    | None => Error("Impossible")
   }
-  }
-}
 
-module Function = {
+  module Function = {
     type definitionId = int
     type match = Match.t<array<definitionId>, definitionId>
 
-  let make = (~name, ~definitions): function => {
-    name: name,
-    definitions: definitions,
-  }
-
-  let makeDefinition = (~name, ~inputs, ~run): fnDefinition => {
-    name: name,
-    inputs: inputs,
-    run: run,
-  }
-
     let match = (f: function, fnName: string, args: array<expressionValue>): match => {
       let matchedDefinition = () =>
         E.A.getIndexBy(f.definitions, r =>
@@ -164,18 +146,18 @@ module Function = {
         Match.DifferentName,
       )
     }
-}
+  }
 
-module RegistryMatch = {
+  module RegistryMatch = {
     type match = {
       fnName: string,
       inputIndex: int,
     }
     type t = Match.t<array<match>, match>
     let makeMatch = (fnName: string, inputIndex: int) => {fnName: fnName, inputIndex: inputIndex}
-}
+  }
 
-module Registry = {
+  module Registry = {
     let findExactMatches = (r: registry, fnName: string, args: array<expressionValue>) => {
       let functionMatchPairs = r->E.A2.fmap(l => (l, Function.match(l, fnName, args)))
       let getFullMatch = E.A.getBy(functionMatchPairs, ((_, match: Function.match)) =>
@@ -226,11 +208,48 @@ module Registry = {
       registry
       ->E.A.getBy(fn => fn.name === fnName)
       ->E.O.bind(fn => E.A.get(fn.definitions, inputIndex))
+  }
+}
 
+module FnDefinition = {
+  let getArgValues = (f: fnDefinition, args: array<expressionValue>): option<array<value>> => {
+    let mainInputTypes = f.inputs
+    if E.A.length(f.inputs) !== E.A.length(args) {
+      None
+    } else {
+      E.A.zip(mainInputTypes, args)
+      ->E.A2.fmap(((input, arg)) => matchInput(input, arg))
+      ->E.A.O.openIfAllSome
+    }
+  }
+  let run = (f: fnDefinition, args: array<expressionValue>) => {
+    let argValues = getArgValues(f, args)
+    switch argValues {
+    | Some(values) => f.run(values)
+    | None => Error("Impossible")
+    }
+  }
+}
+
+module Function = {
+  type definitionId = int
+  let make = (~name, ~definitions): function => {
+    name: name,
+    definitions: definitions,
+  }
+
+  let makeDefinition = (~name, ~inputs, ~run): fnDefinition => {
+    name: name,
+    inputs: inputs,
+    run: run,
+  }
+}
+
+module Registry = {
   let matchAndRun = (r: registry, fnName: string, args: array<expressionValue>) => {
-    switch findMatches(r, fnName, args) {
-    | Match.FullMatch(m) =>
-      fullMatchToDef(r, m)->E.O2.fmap(r => {
+    switch Matcher.Registry.findMatches(r, fnName, args) {
+    | Matcher.Match.FullMatch(m) =>
+      Matcher.Registry.fullMatchToDef(r, m)->E.O2.fmap(r => {
         FnDefinition.run(r, args)
       })
     | _ => None