feat: handle colored posting

Author: ascandone

internal/interpreter/interpreter.go

@@ -615,7 +615,7 @@ func (s *programState) trySendingToAccount(accountLiteral parser.ValueExpr, amou
 			// TODO update cached asset
 
 			s.Postings = append(s.Postings, Posting{
-				Asset:       s.CurrentAsset,
+				Asset:       coloredAsset(s.CurrentAsset, &sender.Color),
 				Source:      sender.Name,
 				Destination: *account,
 				Amount:      sender.Amount,

internal/interpreter/interpreter_test.go

@@ -4568,3 +4568,98 @@ func TestInvalidColor(t *testing.T) {
 	}
 	testWithFeatureFlag(t, tc, flags.ExperimentalAssetColors)
 }
+
+func TestThroughRemoveColor(t *testing.T) {
+	script := `
+ 		send [USD 10] (
+			source = @src \ "BLUE" through @proxy
+			destination = @dest
+		)
+	`
+
+	tc := NewTestCase()
+	tc.compile(t, script)
+
+	tc.setBalance("src", "USD_BLUE", 999)
+
+	tc.expected = CaseResult{
+		Postings: []Posting{
+			{
+				Asset:       "USD_BLUE",
+				Amount:      big.NewInt(10),
+				Source:      "src",
+				Destination: "proxy",
+			},
+
+			{
+				Asset:       "USD",
+				Amount:      big.NewInt(10),
+				Source:      "proxy",
+				Destination: "dest",
+			},
+		},
+		Error: nil,
+	}
+	testWithFeatureFlag(t, tc, flags.ExperimentalAssetColors)
+}
+
+func TestThroughRecolor(t *testing.T) {
+	script := `
+ 		send [USD 10] (
+			source = @src \ "BLUE" through @proxy\"RED"
+			destination = @dest
+		)
+	`
+
+	tc := NewTestCase()
+	tc.compile(t, script)
+
+	tc.setBalance("src", "USD_BLUE", 999)
+	tc.setBalance("proxy", "USD_RED", 999)
+
+	tc.expected = CaseResult{
+		Postings: []Posting{
+			{
+				Asset:       "USD_BLUE",
+				Amount:      big.NewInt(10),
+				Source:      "src",
+				Destination: "proxy",
+			},
+
+			{
+				Asset:       "USD_RED",
+				Amount:      big.NewInt(10),
+				Source:      "proxy",
+				Destination: "dest",
+			},
+		},
+		Error: nil,
+	}
+	testWithFeatureFlag(t, tc, flags.ExperimentalAssetColors)
+}
+
+func TestThroughNoBalanceForProxy(t *testing.T) {
+	t.Skip("TODO")
+
+	script := `
+ 		send [USD 10] (
+			source = @world through @proxy\"RED"
+			destination = @dest
+		)
+	`
+
+	tc := NewTestCase()
+	tc.compile(t, script)
+
+	tc.setBalance("proxy", "USD_RED", 1)
+
+	tc.expected = CaseResult{
+		Postings: []Posting{},
+		Error: machine.MissingFundsErr{
+			Asset:     "USD",
+			Needed:    *big.NewInt(10),
+			Available: *big.NewInt(0),
+		},
+	}
+	testWithFeatureFlag(t, tc, flags.ExperimentalAssetColors)
+}