feature: allow specify offset in name pattern

pkg/util/stringutils2/namepattern_test.go

@@ -0,0 +1,64 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package stringutils2
+
+import (
+	"testing"
+)
+
+func TestParseNamePattern2(t *testing.T) {
+	cases := []struct {
+		input      string
+		match      string
+		pattern    string
+		patternLen int
+		offset     int
+	}{
+		{
+			input:      "testimg###",
+			match:      "testimg%",
+			pattern:    "testimg%03d",
+			patternLen: 3,
+			offset:     0,
+		},
+		{
+			input:      "testimg###66#",
+			match:      "testimg%",
+			pattern:    "testimg%03d",
+			patternLen: 3,
+			offset:     66,
+		},
+		{
+			input:      "testimg###ab#",
+			match:      "testimg%",
+			pattern:    "testimg%03d",
+			patternLen: 3,
+			offset:     0,
+		},
+		{
+			input:      "testimg",
+			match:      "testimg-%",
+			pattern:    "testimg-%d",
+			patternLen: 0,
+			offset:     0,
+		},
+	}
+	for _, c := range cases {
+		m, p, pl, o := ParseNamePattern2(c.input)
+		if m != c.match || p != c.pattern || pl != c.patternLen || o != c.offset {
+			t.Errorf("match got %s want %s, pattern got %s want %s, patternLen got %d want %d, offset got %d want %d", m, c.match, p, c.pattern, pl, c.patternLen, o, c.offset)
+		}
+	}
+}