reorganize directory and file structure

lib/compare/registry.js

@@ -0,0 +1,35 @@
+import { getInst, getType } from "../primitives/dynamic.js";
+import { SymbolBool, SymbolChar, SymbolDouble, SymbolInt, SymbolType, SymbolUnit } from "../primitives/primitive_types.js";
+import { getHumanReadableName } from "../primitives/symbol.js";
+import { symbolDict, symbolList, symbolProduct, symbolSet, symbolSum } from "../structures/type_constructors.js";
+import { capitalizeFirstLetter } from "../util/util.js";
+import { compareBools, compareNumbers, compareStrings, compareUnits } from "./primitives.js";
+import { compareLists, compareProducts, compareSets, compareSums } from "./structures.js";
+import { compareTypes } from "./type.js";
+
+const typeSymbolToCmp = new Map([
+  [SymbolInt    , compareNumbers],
+  [SymbolChar   , compareStrings],
+  [SymbolDouble , compareNumbers],
+  [SymbolBool   , compareBools],
+  [SymbolUnit   , compareUnits],
+  [SymbolType   , compareTypes],
+
+  // these functions take extra comparison callbacks:
+  [symbolList    , compareLists],
+  [symbolProduct , compareProducts],
+  [symbolSum     , compareSums],
+  [symbolSet     , compareSets],
+  // [symbolDict    , compareDicts], TODO
+]);
+
+export const makeCompareFn = type => {
+  return type.params.reduce(
+    (acc, cur) => acc(makeCompareFn(cur(type))),
+    typeSymbolToCmp.get(type.symbol)
+  );
+};
+
+export const compareDynamic = x => y =>
+  compareTypes(getType(x))(getType(y))
+    || makeCompareFn(getType(x))(getInst(x))(getInst(y));