JS parameters in squiggle lang

packages/components/package.json

@@ -1,19 +1,19 @@
 {
   "name": "@quri/squiggle-components",
-  "version": "0.2.14",
+  "version": "0.2.15",
   "license": "MIT",
   "dependencies": {
-    "react-ace": "10.1.0",
     "@quri/squiggle-lang": "^0.2.7",
-    "react-dom": "^18.1.0",
-    "vega": "^5.22.1",
-    "vega-embed": "^6.20.6",
-    "vega-lite": "^5.2.0",
-    "react-vega": "^7.5.0",
-    "react": "^18.1.0",
     "@react-hook/size": "^2.1.2",
     "lodash": "^4.17.21",
-    "styled-components": "^5.3.5"
+    "react": "^18.1.0",
+    "react-ace": "10.1.0",
+    "react-dom": "^18.1.0",
+    "react-vega": "^7.5.0",
+    "styled-components": "^5.3.5",
+    "vega": "^5.22.1",
+    "vega-embed": "^6.20.6",
+    "vega-lite": "^5.2.0"
   },
   "devDependencies": {
     "@babel/plugin-proposal-private-property-in-object": "^7.16.7",
@@ -25,27 +25,26 @@
     "@storybook/node-logger": "^6.4.22",
     "@storybook/preset-create-react-app": "^4.1.0",
     "@storybook/react": "^6.4.22",
-    "@types/styled-components": "^5.1.24",
-    "@types/webpack": "^5.28.0",
-    "style-loader": "^3.3.1",
-    "ts-loader": "^9.2.9",
-    "webpack": "^5.72.0",
-    "webpack-cli": "^4.9.2",
-    "webpack-dev-server": "^4.8.1",
     "@testing-library/jest-dom": "^5.16.4",
     "@testing-library/react": "^13.1.1",
     "@testing-library/user-event": "^14.1.1",
     "@types/jest": "^27.4.0",
-    "web-vitals": "^2.1.4",
     "@types/lodash": "^4.14.182",
     "@types/node": "^17.0.29",
     "@types/react": "^18.0.3",
     "@types/react-dom": "^18.0.2",
+    "@types/styled-components": "^5.1.24",
+    "@types/webpack": "^5.28.0",
     "cross-env": "^7.0.3",
     "react-scripts": "5.0.1",
+    "style-loader": "^3.3.1",
+    "ts-loader": "^9.2.9",
     "tsconfig-paths-webpack-plugin": "^3.5.2",
     "typescript": "^4.6.3",
-    "webpack-cli": "^4.9.2"
+    "web-vitals": "^2.1.4",
+    "webpack": "^5.72.0",
+    "webpack-cli": "^4.9.2",
+    "webpack-dev-server": "^4.8.1"
   },
   "scripts": {
     "start": "cross-env REACT_APP_FAST_REFRESH=false && start-storybook -p 6006 -s public",

packages/squiggle-lang/__tests__/TS/JS_test.ts

@@ -68,6 +68,29 @@ describe("Partials", () => {
   });
 });
 
+describe("Parameters", () => {
+  test("Can pass parameters into partials and cells", () => {
+    let bindings = testRunPartial(`y = $x + 2`, {}, { x: 1 }); // y = 3
+    let bindings2 = testRunPartial(`z = $x + y * $a`, bindings, { a: 3 }); // z = 1 + 3 * 3 = 10
+    expect(testRun(`z + $x + $a + y`, bindings2)).toEqual({
+      tag: "number",
+      value: 17,
+    });
+  });
+  test("Complicated deep parameters", () => {
+    expect(
+      testRun(
+        `$x.y[0][0].w + $x.z + $u.v`,
+        {},
+        { x: { y: [[{ w: 1 }]], z: 2 }, u: { v: 3 } }
+      )
+    ).toEqual({
+      tag: "number",
+      value: 6,
+    });
+  });
+});
+
 describe("Distribution", () => {
   //It's important that sampleCount is less than 9. If it's more, than that will create randomness
   //Also, note, the value should be created using makeSampleSetDist() later on.

packages/squiggle-lang/__tests__/TS/TestHelpers.ts

@@ -6,11 +6,20 @@ import {
   errorValueToString,
 } from "../../src/js/index";
 
-export function testRun(x: string, bindings = {}): squiggleExpression {
-  let squiggleResult = run(x, bindings, {
+export function testRun(
+  x: string,
+  bindings = {},
+  parameters = {}
+): squiggleExpression {
+  let squiggleResult = run(
+    x,
+    bindings,
+    {
       sampleCount: 1000,
       xyPointLength: 100,
-  });
+    },
+    parameters
+  );
   // return squiggleResult.value
   if (squiggleResult.tag === "Ok") {
     return squiggleResult.value;
@@ -23,11 +32,20 @@ export function testRun(x: string, bindings = {}): squiggleExpression {
   }
 }
 
-export function testRunPartial(x: string, bindings: bindings = {}): bindings {
-  let squiggleResult = runPartial(x, bindings, {
+export function testRunPartial(
+  x: string,
+  bindings: bindings = {},
+  parameters = {}
+): bindings {
+  let squiggleResult = runPartial(
+    x,
+    bindings,
+    {
       sampleCount: 1000,
       xyPointLength: 100,
-  });
+    },
+    parameters
+  );
   if (squiggleResult.tag === "Ok") {
     return squiggleResult.value;
   } else {

packages/squiggle-lang/src/js/index.ts

@@ -99,25 +99,71 @@ export type squiggleExpression =
 export function run(
   squiggleString: string,
   bindings?: externalBindings,
-  samplingInputs?: samplingParams
+  samplingInputs?: samplingParams,
+  parameters?: parameters
 ): result<squiggleExpression, errorValue> {
   let b = bindings ? bindings : {};
+  let p = parameters ? parameters : {};
   let si: samplingParams = samplingInputs
     ? samplingInputs
     : defaultSamplingInputs;
 
   let result: result<expressionValue, errorValue> =
-    evaluateUsingExternalBindings(squiggleString, b);
+    evaluateUsingExternalBindings(squiggleString, mergeParameters(b, p));
   return resultMap(result, (x) => createTsExport(x, si));
 }
 
 // Run Partial. A partial is a block of code that doesn't return a value
 export function runPartial(
   squiggleString: string,
-  bindings: externalBindings,
-  _samplingInputs?: samplingParams
+  bindings?: externalBindings,
+  _samplingInputs?: samplingParams,
+  parameters?: parameters
 ): result<externalBindings, errorValue> {
-  return evaluatePartialUsingExternalBindings(squiggleString, bindings);
+  let b = bindings ? bindings : {};
+  let p = parameters ? parameters : {};
+
+  return evaluatePartialUsingExternalBindings(
+    squiggleString,
+    mergeParameters(b, p)
+  );
+}
+
+function mergeParameters(
+  bindings: externalBindings,
+  parameters: parameters
+): externalBindings {
+  let transformedParemeters = Object.fromEntries(
+    Object.entries(parameters).map(([key, value]) => [
+      "$" + key,
+      jsValueToBinding(value),
+    ])
+  );
+  return _.merge(bindings, transformedParemeters);
+}
+
+type parameters = { [key: string]: jsValue };
+
+type jsValue =
+  | string
+  | number
+  | jsValue[]
+  | { [key: string]: jsValue }
+  | boolean;
+
+function jsValueToBinding(value: jsValue): rescriptExport {
+  if (typeof value === "boolean") {
+    return { TAG: 1, _0: value as boolean };
+  } else if (typeof value === "string") {
+    return { TAG: 6, _0: value as string };
+  } else if (typeof value === "number") {
+    return { TAG: 4, _0: value as number };
+  } else if (Array.isArray(value)) {
+    return { TAG: 0, _0: value.map(jsValueToBinding) };
+  } else {
+    // Record
+    return { TAG: 5, _0: _.mapValues(value, jsValueToBinding) };
+  }
 }
 
 function createTsExport(

packages/squiggle-lang/src/rescript/Reducer/Reducer_MathJs/Reducer_MathJs_Eval.res

@@ -19,6 +19,7 @@ let eval__: string => 'a = %raw(`function (expr) { return {value: Mathjs.evaluat
 */
 let eval = (expr: string): result<expressionValue, errorValue> => {
   try {
+    Js.log(expr)
     let answer = eval__(expr)
     answer["value"]->JavaScript.Gate.jsToEv
   } catch {