From b3b2c39df680f88e1e6d3615245754ae5f0380d0 Mon Sep 17 00:00:00 2001
From: Akshay Nair <phenax5@gmail.com>
Date: Sat, 8 Jan 2022 21:17:10 +0530
Subject: feat(eval): implements object property matching

---
 src/eval/index.ts | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

(limited to 'src/eval')

diff --git a/src/eval/index.ts b/src/eval/index.ts
index f80c04d..b4dcf48 100644
--- a/src/eval/index.ts
+++ b/src/eval/index.ts
@@ -1,23 +1,27 @@
-import {pipe} from 'fp-ts/function';
+import { pipe } from 'fp-ts/function'
 import { Expr, ListExpr } from '../types'
-import {match} from '../utils';
+import { match } from '../utils'
 
 export const find = <T>([startO, exprs, endO]: ListExpr, list: T[]): any => {
-  const check = (expr: Expr) => <T>(x: T, i: number, ls: T[]): boolean => {
-    return pipe(
-      expr,
-      match<boolean, Expr>({
-        AnyItem: _ => true,
-        AnyNumber: _ => typeof x === 'number',
-        AnyString: _ => typeof x === 'string',
-        AnyBool: _ => typeof x === 'boolean',
-        Truthy: _ => !!x,
-        Falsey: _ => !x,
-        Group: ({ exprs }) => exprs.every(e => check(e)(x, i, ls)),
-        _: _ => false,
-      })
-    )
-  };
+  const check =
+    (expr: Expr) =>
+    <T>(x: T, i: number, ls: T[]): boolean => {
+      return pipe(
+        expr,
+        match<boolean, Expr>({
+          AnyItem: _ => true,
+          AnyNumber: _ => typeof x === 'number',
+          AnyString: _ => typeof x === 'string',
+          AnyBool: _ => typeof x === 'boolean',
+          Truthy: _ => !!x,
+          Falsey: _ => !x,
+          Group: ({ exprs }) => exprs.every(e => check(e)(x, i, ls)),
+          PropertyMatch: ({ name, exprs }) =>
+            name in x && exprs.every(e => check(e)(x[name], i, ls)),
+          _: _ => false,
+        }),
+      )
+    }
 
   const cs = exprs.map(check)
 
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