support marshaling and unmarshaling of PoCs

2 files changed, 57 insertions, 0 deletions

diff --git a/go/game/pileOfCards.go b/go/game/pileOfCards.go
index 0ad0f157..88a3c750 100644
--- a/go/game/pileOfCards.go
+++ b/go/game/pileOfCards.go
@@ -1,8 +1,10 @@
 package game
 
 import (
+	"errors"
 	"fmt"
 	"math/rand"
+	"strings"
 
 	"golang.org/x/exp/slices"
 )
@@ -28,6 +30,36 @@ func NewPileOfCards() *PileOfCardsBase {
 	return &PileOfCardsBase{[]*Card{}}
 }
 
+// Stringify to a []-bracket enclosed comma-seperated list of card names.
+func (poc *PileOfCardsBase) String() string {
+	cardNames := make([]string, 0, len(poc.Cards()))
+	for _, card := range poc.Cards() {
+		cardNames = append(cardNames, card.Path())
+	}
+	return fmt.Sprintf("[%s]", strings.Join(cardNames, ", "))
+}
+
+var InvalidPocString = errors.New("Invalid PileOfCards format")
+
+// Initialise a PileOfCard from a string.
+// Return InvalidPocString on error.
+func (poc *PileOfCardsBase) FromString(in string) error {
+	if in[0] != '[' || in[len(in)-1] != ']' {
+		return InvalidPocString
+	}
+
+	in = in[1 : len(in)-1]
+
+	for cardName := range strings.SplitSeq(in, ", ") {
+		if card, err := NewCardSafe(cardName); err != nil {
+			return err
+		} else {
+			poc.AddCard(card)
+		}
+	}
+	return nil
+}
+
 func (poc *PileOfCardsBase) Size() int {
 	return len(poc.cards)
 }
diff --git a/go/game/pileOfCards_test.go b/go/game/pileOfCards_test.go
new file mode 100644
index 00000000..0c9532fe
--- /dev/null
+++ b/go/game/pileOfCards_test.go
@@ -0,0 +1,25 @@
+package game
+
+import (
+	"testing"
+)
+
+func TestPocToString(t *testing.T) {
+	poc := NewPileOfCards()
+	cards := []*Card{NewCard("base/archer"), NewCard("magic/ritual!")}
+	poc.AddCards(cards)
+	exp := "[base/archer, magic/ritual!]"
+	is := poc.String()
+	if is != exp {
+		t.Fatalf("expected string %s does not match %s\n", exp, is)
+	}
+}
+
+func TestPocFromString(t *testing.T) {
+	poc := NewPileOfCards()
+	in := "[base/archer, magic/ritual!]"
+	err := poc.FromString(in)
+	if err != nil {
+		t.Fatal(err)
+	}
+}