fix: expression support Drop.valueOf, fixes #522

Author: harttle

src/render/operator.ts

@@ -11,38 +11,38 @@ export const defaultOperators: Operators = {
   '==': (l: any, r: any) => {
     if (isComparable(l)) return l.equals(r)
     if (isComparable(r)) return r.equals(l)
-    return l === r
+    return toValue(l) === toValue(r)
   },
   '!=': (l: any, r: any) => {
     if (isComparable(l)) return !l.equals(r)
     if (isComparable(r)) return !r.equals(l)
-    return l !== r
+    return toValue(l) !== toValue(r)
   },
   '>': (l: any, r: any) => {
     if (isComparable(l)) return l.gt(r)
     if (isComparable(r)) return r.lt(l)
-    return l > r
+    return toValue(l) > toValue(r)
   },
   '<': (l: any, r: any) => {
     if (isComparable(l)) return l.lt(r)
     if (isComparable(r)) return r.gt(l)
-    return l < r
+    return toValue(l) < toValue(r)
   },
   '>=': (l: any, r: any) => {
     if (isComparable(l)) return l.geq(r)
     if (isComparable(r)) return r.leq(l)
-    return l >= r
+    return toValue(l) >= toValue(r)
   },
   '<=': (l: any, r: any) => {
     if (isComparable(l)) return l.leq(r)
     if (isComparable(r)) return r.geq(l)
-    return l <= r
+    return toValue(l) <= toValue(r)
   },
   'contains': (l: any, r: any) => {
     l = toValue(l)
     r = toValue(r)
     return l && isFunction(l.indexOf) ? l.indexOf(r) > -1 : false
   },
-  'and': (l: any, r: any, ctx: Context) => isTruthy(l, ctx) && isTruthy(r, ctx),
-  'or': (l: any, r: any, ctx: Context) => isTruthy(l, ctx) || isTruthy(r, ctx)
+  'and': (l: any, r: any, ctx: Context) => isTruthy(toValue(l), ctx) && isTruthy(toValue(r), ctx),
+  'or': (l: any, r: any, ctx: Context) => isTruthy(toValue(l), ctx) || isTruthy(toValue(r), ctx)
 }

test/integration/drop/drop.ts

@@ -72,4 +72,16 @@ describe('drop/drop', function () {
     const html = await liquid.parseAndRender(tpl, { drop: new CustomDrop() })
     expect(html).to.equal('foobar: foo;bar;')
   })
+  it('should support valueOf in == expression', async () => {
+    class AddressDrop extends Drop {
+      valueOf () {
+        return 'test'
+      }
+    }
+    const address = new AddressDrop()
+    const customer = { default_address: new AddressDrop() }
+    const tpl = `{% if address == customer.default_address %}{{address}}{% endif %}`
+    const html = await liquid.parseAndRender(tpl, { address, customer })
+    expect(html).to.equal('test')
+  })
 })