From f4254bd4714782b59c0071fd4cf29eec42d0dc6b Mon Sep 17 00:00:00 2001
From: John Lettman <the@johnlettman.com>
Date: Wed, 17 Jul 2024 22:38:59 -0400
Subject: [PATCH] packet/channel/field: add entries

---
 packet/channel/field/entries.go      | 35 ++++++++++++++++++++
 packet/channel/field/entries_test.go | 48 ++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 packet/channel/field/entries.go
 create mode 100644 packet/channel/field/entries_test.go

diff --git a/packet/channel/field/entries.go b/packet/channel/field/entries.go
new file mode 100644
index 0000000..e3f103a
--- /dev/null
+++ b/packet/channel/field/entries.go
@@ -0,0 +1,35 @@
+package field
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Entries map[Field]Structure
+
+// String returns the string representation of an Entries value.
+func (e Entries) String() string {
+	s := new(strings.Builder)
+	s.WriteString("Entries:\n")
+
+	for k, v := range e {
+		ks := fmt.Sprintf("%s:", k.String())
+		s.WriteString(fmt.Sprintf("\t%-14s %v,\n", ks, v))
+	}
+
+	return s.String()
+}
+
+// GoString returns the Go syntax representation of an Entries value.
+func (e Entries) GoString() string {
+	s := new(strings.Builder)
+	s.WriteString("field.Entries{\n")
+
+	for k, v := range e {
+		ks := fmt.Sprintf("%#v:", k)
+		s.WriteString(fmt.Sprintf("\t%-14s %#v,\n", ks, v))
+	}
+
+	s.WriteRune('}')
+	return s.String()
+}
diff --git a/packet/channel/field/entries_test.go b/packet/channel/field/entries_test.go
new file mode 100644
index 0000000..f0ae659
--- /dev/null
+++ b/packet/channel/field/entries_test.go
@@ -0,0 +1,48 @@
+package field
+
+import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestEntries_StringInterfaces(t *testing.T) {
+	assert.Implements(t, (*fmt.Stringer)(nil), new(Entries))
+	assert.Implements(t, (*fmt.GoStringer)(nil), new(Entries))
+}
+
+func TestEntries_String(t *testing.T) {
+	f := Reflectivity
+	fString := fmt.Sprintf("%s:", f)
+
+	s := Structure{
+		Type:      TypeUint8,
+		Offset:    1,
+		ValueMask: 0xF,
+		Shift:     32,
+	}
+
+	e := Entries{f: s}
+	want := fmt.Sprintf("Entries:\n\t%-14s %v,\n", fString, s)
+	got := e.String()
+
+	assert.Equal(t, want, got, "it should return the correct representation")
+}
+
+func TestEntries_GoString(t *testing.T) {
+	f := Reflectivity
+	fString := fmt.Sprintf("%#v:", f)
+
+	s := Structure{
+		Type:      TypeUint8,
+		Offset:    1,
+		ValueMask: 0xF,
+		Shift:     32,
+	}
+
+	e := Entries{f: s}
+	want := fmt.Sprintf("field.Entries{\n\t%-14s %#v,\n}", fString, s)
+	got := e.GoString()
+
+	assert.Equal(t, want, got, "it should return the correct representation")
+}