Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

analysis/lang/pl/stempel/diff_test.go

@@ -0,0 +1,144 @@
+//  Copyright (c) 2018 Couchbase, Inc.
+//
+// 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 stempel
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestDiff(t *testing.T) {
+	tests := []struct {
+		in  []rune
+		cmd []rune
+		out []rune
+	}{
+		// test delete, this command deletes N chars backwards from the current pos
+		// the current pos starts at the end of the string
+		// if you try to delete a negative number of chars or more chars than there
+		// are, you will get the buffer at that time
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 1
+			cmd: []rune{'D', 'a'},
+			out: []rune{'h', 'e', 'l', 'l'},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 2
+			cmd: []rune{'D', 'a' + 1},
+			out: []rune{'h', 'e', 'l'},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 3
+			cmd: []rune{'D', 'a' + 2},
+			out: []rune{'h', 'e'},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 4
+			cmd: []rune{'D', 'a' + 3},
+			out: []rune{'h'},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 5
+			cmd: []rune{'D', 'a' + 4},
+			out: []rune{},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 6 (invalid, return buffer at that point)
+			cmd: []rune{'D', 'a' + 5},
+			out: []rune{'h', 'e', 'l', 'l', 'o'},
+		},
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete -1
+			cmd: []rune{'D', 'a' - 1},
+			out: []rune{'h', 'e', 'l', 'l', 'o'},
+		},
+		// delete one char twice
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  delete 1, delete 1
+			cmd: []rune{'D', 'a', 'D', 'a'},
+			out: []rune{'h', 'e', 'l'},
+		},
+		// test insert
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  insert 'p'
+			cmd: []rune{'I', 'p'},
+			out: []rune{'h', 'e', 'l', 'l', 'o', 'p'},
+		},
+		// insert twice
+		{
+			in: []rune{'h'},
+			//  insert 'l', insert 'e'
+			// NOTE how the cursor moves backwards, so we have to insert in reverse
+			cmd: []rune{'I', 'l', 'I', 'e'},
+			out: []rune{'h', 'e', 'l'},
+		},
+		// test replace
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  replace with 'y'
+			cmd: []rune{'R', 'y'},
+			out: []rune{'h', 'e', 'l', 'l', 'y'},
+		},
+		// test replace again
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  replace with 'y', then replace with 'x'
+			// NOTE how the cursor moves backwards as we replace
+			cmd: []rune{'R', 'y', 'R', 'x'},
+			out: []rune{'h', 'e', 'l', 'x', 'y'},
+		},
+		// test skip, then replace
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  skip 1, then replace with 'y'
+			cmd: []rune{'-', 'a', 'R', 'y'},
+			out: []rune{'h', 'e', 'l', 'y', 'o'},
+		},
+		// test skip 2, then replace
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  skip 1, then replace with 'y'
+			cmd: []rune{'-', 'a' + 1, 'R', 'y'},
+			out: []rune{'h', 'e', 'y', 'l', 'o'},
+		},
+		// test skip 2, then replace
+		{
+			in: []rune{'h', 'e', 'l', 'l', 'o'},
+			//  skip 5 (too far), then replace with 'y'
+			//  get original
+			cmd: []rune{'-', 'a' + 4, 'R', 'y'},
+			out: []rune{'h', 'e', 'l', 'l', 'o'},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%s-'%s'", string(test.in), string(test.cmd)), func(t *testing.T) {
+			got := Diff(test.in, test.cmd)
+			if !reflect.DeepEqual(test.out, got) {
+				t.Errorf("expected %v, got %v", test.out, got)
+			}
+		})
+	}
+}