config: introduce StringList to abstract over list hack
This is the initial pure "all tests passing without a diff" stage. The plan is to change the internal representation of StringList to include a suffix delimiter, which will allow us to recognize empty and single-element lists.
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6b84405aa9
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10b3abf405
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@ -131,8 +131,8 @@ func interpolationFuncFormatList() ast.Function {
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if !ok {
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continue
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}
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parts := strings.Split(s, InterpSplitDelim)
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if len(parts) == 1 {
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parts := StringList(s).Slice()
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if len(parts) <= 1 {
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continue
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}
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varargs[i-1] = parts
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@ -167,7 +167,7 @@ func interpolationFuncFormatList() ast.Function {
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}
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list[i] = fmt.Sprintf(format, fmtargs...)
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}
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return strings.Join(list, InterpSplitDelim), nil
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return NewStringList(list).String(), nil
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},
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}
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}
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@ -181,7 +181,7 @@ func interpolationFuncJoin() ast.Function {
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Callback: func(args []interface{}) (interface{}, error) {
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var list []string
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for _, arg := range args[1:] {
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parts := strings.Split(arg.(string), InterpSplitDelim)
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parts := StringList(arg.(string)).Slice()
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list = append(list, parts...)
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}
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@ -223,18 +223,15 @@ func interpolationFuncLength() ast.Function {
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ReturnType: ast.TypeInt,
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Variadic: false,
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Callback: func(args []interface{}) (interface{}, error) {
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if !strings.Contains(args[0].(string), InterpSplitDelim) {
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if !IsStringList(args[0].(string)) {
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return len(args[0].(string)), nil
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}
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var list []string
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length := 0
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for _, arg := range args {
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parts := strings.Split(arg.(string), InterpSplitDelim)
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for _, part := range parts {
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list = append(list, part)
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}
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length += StringList(arg.(string)).Length()
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}
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return len(list), nil
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return length, nil
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},
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}
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}
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@ -246,7 +243,9 @@ func interpolationFuncSplit() ast.Function {
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ArgTypes: []ast.Type{ast.TypeString, ast.TypeString},
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ReturnType: ast.TypeString,
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Callback: func(args []interface{}) (interface{}, error) {
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return strings.Replace(args[1].(string), args[0].(string), InterpSplitDelim, -1), nil
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sep := args[0].(string)
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s := args[1].(string)
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return NewStringList(strings.Split(s, sep)).String(), nil
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},
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}
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}
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@ -284,7 +283,7 @@ func interpolationFuncElement() ast.Function {
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ArgTypes: []ast.Type{ast.TypeString, ast.TypeString},
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ReturnType: ast.TypeString,
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Callback: func(args []interface{}) (interface{}, error) {
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list := strings.Split(args[0].(string), InterpSplitDelim)
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list := StringList(args[0].(string))
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index, err := strconv.Atoi(args[1].(string))
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if err != nil {
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@ -292,7 +291,7 @@ func interpolationFuncElement() ast.Function {
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"invalid number for index, got %s", args[1])
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}
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v := list[index%len(list)]
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v := list.Element(index)
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return v, nil
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},
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}
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@ -323,7 +322,7 @@ func interpolationFuncKeys(vs map[string]ast.Variable) ast.Function {
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sort.Strings(keys)
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return strings.Join(keys, InterpSplitDelim), nil
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return NewStringList(keys).String(), nil
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},
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}
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}
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@ -363,7 +362,7 @@ func interpolationFuncValues(vs map[string]ast.Variable) ast.Function {
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vals = append(vals, vs[k].Value.(string))
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}
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return strings.Join(vals, InterpSplitDelim), nil
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return NewStringList(vals).String(), nil
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},
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}
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}
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@ -204,7 +204,7 @@ func TestInterpolateFuncFormatList(t *testing.T) {
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// formatlist applies to each list element in turn
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{
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`${formatlist("<%s>", split(",", "A,B"))}`,
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"<A>" + InterpSplitDelim + "<B>",
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"<A>" + StringListDelim + "<B>",
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false,
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},
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// formatlist repeats scalar elements
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@ -268,8 +268,8 @@ func TestInterpolateFuncJoin(t *testing.T) {
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fmt.Sprintf(`${join(".", "%s")}`,
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fmt.Sprintf(
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"foo%sbar%sbaz",
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InterpSplitDelim,
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InterpSplitDelim)),
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StringListDelim,
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StringListDelim)),
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"foo.bar.baz",
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false,
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},
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@ -396,9 +396,9 @@ func TestInterpolateFuncSplit(t *testing.T) {
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`${split(",", ",,,")}`,
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fmt.Sprintf(
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"%s%s%s",
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InterpSplitDelim,
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InterpSplitDelim,
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InterpSplitDelim),
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StringListDelim,
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StringListDelim,
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StringListDelim),
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false,
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},
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@ -407,7 +407,7 @@ func TestInterpolateFuncSplit(t *testing.T) {
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fmt.Sprintf(
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"%s%s",
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"foo",
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InterpSplitDelim),
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StringListDelim),
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false,
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},
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@ -415,9 +415,9 @@ func TestInterpolateFuncSplit(t *testing.T) {
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`${split(",", ",foo,")}`,
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fmt.Sprintf(
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"%s%s%s",
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InterpSplitDelim,
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StringListDelim,
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"foo",
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InterpSplitDelim),
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StringListDelim),
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false,
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},
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@ -425,8 +425,8 @@ func TestInterpolateFuncSplit(t *testing.T) {
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`${split(".", "foo.bar.baz")}`,
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fmt.Sprintf(
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"foo%sbar%sbaz",
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InterpSplitDelim,
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InterpSplitDelim),
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StringListDelim,
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StringListDelim),
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false,
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},
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},
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@ -486,7 +486,7 @@ func TestInterpolateFuncKeys(t *testing.T) {
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`${keys("foo")}`,
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fmt.Sprintf(
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"bar%squx",
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InterpSplitDelim),
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StringListDelim),
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false,
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},
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@ -535,7 +535,7 @@ func TestInterpolateFuncValues(t *testing.T) {
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`${values("foo")}`,
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fmt.Sprintf(
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"quack%sbaz",
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InterpSplitDelim),
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StringListDelim),
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false,
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},
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@ -568,7 +568,7 @@ func TestInterpolateFuncElement(t *testing.T) {
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Cases: []testFunctionCase{
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{
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fmt.Sprintf(`${element("%s", "1")}`,
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"foo"+InterpSplitDelim+"baz"),
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"foo"+StringListDelim+"baz"),
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"baz",
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false,
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},
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@ -582,7 +582,7 @@ func TestInterpolateFuncElement(t *testing.T) {
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// Invalid index should wrap vs. out-of-bounds
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{
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fmt.Sprintf(`${element("%s", "2")}`,
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"foo"+InterpSplitDelim+"baz"),
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"foo"+StringListDelim+"baz"),
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"foo",
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false,
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},
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@ -590,7 +590,7 @@ func TestInterpolateFuncElement(t *testing.T) {
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// Too many args
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{
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fmt.Sprintf(`${element("%s", "0", "2")}`,
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"foo"+InterpSplitDelim+"baz"),
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"foo"+StringListDelim+"baz"),
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nil,
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true,
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},
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@ -10,10 +10,6 @@ import (
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"github.com/mitchellh/reflectwalk"
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)
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// InterpSplitDelim is the delimeter that is looked for to split when
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// it is returned.
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const InterpSplitDelim = `B780FFEC-B661-4EB8-9236-A01737AD98B6`
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// interpolationWalker implements interfaces for the reflectwalk package
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// (github.com/mitchellh/reflectwalk) that can be used to automatically
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// execute a callback for an interpolation.
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@ -149,7 +145,7 @@ func (w *interpolationWalker) Primitive(v reflect.Value) error {
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// splitting (in a SliceElem) or not.
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remove := false
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if w.loc == reflectwalk.SliceElem {
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parts := strings.Split(replaceVal, InterpSplitDelim)
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parts := StringList(replaceVal).Slice()
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for _, p := range parts {
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if p == UnknownVariableValue {
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remove = true
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@ -247,7 +243,7 @@ func (w *interpolationWalker) splitSlice() {
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if !ok {
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continue
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}
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if idx := strings.Index(sv, InterpSplitDelim); idx >= 0 {
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if IsStringList(sv) {
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split = true
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break
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}
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@ -270,7 +266,7 @@ func (w *interpolationWalker) splitSlice() {
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}
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// Split on the delimiter
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for _, p := range strings.Split(sv, InterpSplitDelim) {
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for _, p := range StringList(sv).Slice() {
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result = append(result, p)
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}
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}
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@ -157,7 +157,7 @@ func TestInterpolationWalker_replace(t *testing.T) {
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"bing",
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},
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},
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Value: "bar" + InterpSplitDelim + "baz",
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Value: "bar" + StringListDelim + "baz",
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},
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{
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@ -168,7 +168,7 @@ func TestInterpolationWalker_replace(t *testing.T) {
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},
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},
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Output: map[string]interface{}{},
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Value: UnknownVariableValue + InterpSplitDelim + "baz",
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Value: UnknownVariableValue + StringListDelim + "baz",
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},
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}
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@ -0,0 +1,65 @@
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package config
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import "strings"
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// StringList represents the "poor man's list" that terraform uses
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// internally
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type StringList string
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// This is the delimiter used to recognize and split StringLists
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const StringListDelim = `B780FFEC-B661-4EB8-9236-A01737AD98B6`
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// Build a StringList from a slice
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func NewStringList(parts []string) StringList {
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// FOR NOW:
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return StringList(strings.Join(parts, StringListDelim))
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// EVENTUALLY:
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// var sl StringList
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// for _, p := range parts {
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// sl = sl.Append(p)
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// }
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// return sl
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}
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// Returns a new StringList with the item appended
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func (sl StringList) Append(s string) StringList {
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// FOR NOW:
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return StringList(strings.Join(append(sl.Slice(), s), StringListDelim))
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// EVENTUALLY:
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// return StringList(fmt.Sprintf("%s%s%s", sl, s, StringListDelim))
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}
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// Returns an element at the index, wrapping around the length of the string
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// when index > list length
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func (sl StringList) Element(index int) string {
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return sl.Slice()[index%sl.Length()]
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}
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// Returns the length of the StringList
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func (sl StringList) Length() int {
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return len(sl.Slice())
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}
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// Returns a slice of strings as represented by this StringList
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func (sl StringList) Slice() []string {
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parts := strings.Split(string(sl), StringListDelim)
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// FOR NOW:
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if sl.String() == "" {
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return []string{}
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} else {
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return parts
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}
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// EVENTUALLY:
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// StringLists always have a trailing StringListDelim
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// return parts[:len(parts)-1]
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}
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func (sl StringList) String() string {
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return string(sl)
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}
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// Determines if a given string represents a StringList
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func IsStringList(s string) bool {
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return strings.Contains(s, StringListDelim)
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}
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@ -582,7 +582,7 @@ func TestSchemaMap_Diff(t *testing.T) {
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},
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ConfigVariables: map[string]string{
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"var.foo": "2" + config.InterpSplitDelim + "5",
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"var.foo": "2" + config.StringListDelim + "5",
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},
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Diff: &terraform.InstanceDiff{
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@ -627,7 +627,7 @@ func TestSchemaMap_Diff(t *testing.T) {
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ConfigVariables: map[string]string{
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"var.foo": config.UnknownVariableValue +
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config.InterpSplitDelim + "5",
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config.StringListDelim + "5",
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},
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Diff: &terraform.InstanceDiff{
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@ -905,7 +905,7 @@ func TestSchemaMap_Diff(t *testing.T) {
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},
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ConfigVariables: map[string]string{
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"var.foo": "2" + config.InterpSplitDelim + "5",
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"var.foo": "2" + config.StringListDelim + "5",
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},
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Diff: &terraform.InstanceDiff{
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@ -953,7 +953,7 @@ func TestSchemaMap_Diff(t *testing.T) {
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ConfigVariables: map[string]string{
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"var.foo": config.UnknownVariableValue +
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config.InterpSplitDelim + "5",
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config.StringListDelim + "5",
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},
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Diff: &terraform.InstanceDiff{
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@ -453,7 +453,7 @@ func (i *Interpolater) computeResourceMultiVariable(
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v.FullKey())
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}
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return strings.Join(values, config.InterpSplitDelim), nil
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return config.NewStringList(values).String(), nil
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}
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func (i *Interpolater) resourceVariableInfo(
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