Add generators for URLs and domain names

ip_addr.go

@@ -0,0 +1,54 @@
+// Copyright 2022 Walter Scheper <walter.scheper@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package rapid
+
+import (
+	"fmt"
+	"net"
+)
+
+const (
+	ipv4Len = 4
+	ipv6Len = 16
+)
+
+var (
+	ipv4Gen = SliceOfN(Byte(), ipv4Len, ipv4Len)
+	ipv6Gen = SliceOfN(Byte(), ipv6Len, ipv6Len)
+)
+
+type ipGen struct {
+	ipv6 bool
+}
+
+func (g *ipGen) String() string {
+	return fmt.Sprintf("IP(ipv6=%v)", g.ipv6)
+}
+
+func (g *ipGen) value(t *T) net.IP {
+	var gen *Generator[[]byte]
+	if g.ipv6 {
+		gen = ipv6Gen
+	} else {
+		gen = ipv4Gen
+	}
+
+	b := gen.Draw(t, g.String())
+	return net.IP(b)
+}
+
+func IPv4() *Generator[net.IP] {
+	return newGenerator[net.IP](&ipGen{
+		ipv6: false,
+	})
+}
+
+func IPv6() *Generator[net.IP] {
+	return newGenerator[net.IP](&ipGen{
+		ipv6: true,
+	})
+}

ip_addr_example_test.go

@@ -0,0 +1,45 @@
+// Copyright 2020 Walter Scheper <walter.scheper@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package rapid_test
+
+import (
+	"fmt"
+
+	"pgregory.net/rapid"
+)
+
+func ExampleIPv4() {
+	gen := rapid.IPv4()
+
+	for i := 0; i < 5; i++ {
+		addr := gen.Example(i)
+		fmt.Println(addr.String())
+	}
+
+	// Output:
+	// 0.23.24.7
+	// 100.146.0.0
+	// 0.222.65.1
+	// 1.49.104.14
+	// 11.56.0.83
+}
+
+func ExampleIPv6() {
+	gen := rapid.IPv6()
+
+	for i := 0; i < 5; i++ {
+		addr := gen.Example(i)
+		fmt.Println(addr.String())
+	}
+
+	// Output:
+	// 17:1807:e2c4:8210:7202:f4b2:a0e2:8dc
+	// 6492:0:fa37:b00:b5c3:4e6:6a01:c802
+	// de:4101:9f5:3:104:5dc:b600:905
+	// 131:680e:97ff:d200:ae1:4d00:2300:103
+	// b38:53:ff07:200:8c28:ee:ad00:1b
+}