lang: funcs: Add strings.split function

Signed-off-by: Lander Van den Bulcke <landervdb@inuits.eu>

lang/funcs/core/corestrings/split_func.go

@@ -0,0 +1,50 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package corestrings
+
+import (
+	"strings"
+
+	"github.com/purpleidea/mgmt/lang/funcs/simple"
+	"github.com/purpleidea/mgmt/lang/types"
+)
+
+func init() {
+	simple.ModuleRegister(moduleName, "split", &types.FuncValue{
+		T: types.NewType("func(a str, b str) []str"),
+		V: Split,
+	})
+}
+
+// Split splits the input string using the separator and returns the
+// segments as a list.
+func Split(input []types.Value) (types.Value, error) {
+	str, sep := input[0].Str(), input[1].Str()
+
+	segments := strings.Split(str, sep)
+
+	listVal := types.NewList(types.NewType("[]str"))
+
+	for _, segment := range segments {
+		listVal.Add(&types.StrValue{
+			V: segment,
+		})
+	}
+
+	return listVal, nil
+}

lang/funcs/core/corestrings/split_func_test.go

@@ -0,0 +1,64 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package corestrings
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/purpleidea/mgmt/lang/types"
+	"github.com/purpleidea/mgmt/util"
+)
+
+func testSplit(input, sep string, output []string) error {
+	inputVal, sepVal := &types.StrValue{V: input}, &types.StrValue{V: sep}
+
+	val, err := Split([]types.Value{inputVal, sepVal})
+	if err != nil {
+		return err
+	}
+	listVal, ok := val.(*types.ListValue)
+	if !ok {
+		return fmt.Errorf("split did not return a list")
+	}
+	for _, segment := range output {
+		if _, ok := listVal.Contains(&types.StrValue{V: segment}); !ok {
+			return fmt.Errorf("output does not contained expected segment %s", segment)
+		}
+	}
+	for _, segment := range listVal.V {
+		if !util.StrInList(segment.Str(), output) {
+			return fmt.Errorf("output contains unexpected segment %s", segment.Str())
+		}
+	}
+	return nil
+}
+
+func TestSplit(t *testing.T) {
+	values := map[string][]string{
+		"hello,world": {"hello", "world"},
+		"hello world": {"hello world"},
+		"hello;world": {"hello;world"},
+	}
+
+	for input, output := range values {
+		if err := testSplit(input, ",", output); err != nil {
+			t.Error(err)
+		}
+	}
+}