288 lines
7.2 KiB
Go
288 lines
7.2 KiB
Go
package toml
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import (
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"bytes"
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"fmt"
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"io"
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"math"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"time"
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)
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// encodes a string to a TOML-compliant string value
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func encodeTomlString(value string) string {
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var b bytes.Buffer
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for _, rr := range value {
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switch rr {
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case '\b':
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b.WriteString(`\b`)
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case '\t':
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b.WriteString(`\t`)
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case '\n':
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b.WriteString(`\n`)
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case '\f':
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b.WriteString(`\f`)
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case '\r':
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b.WriteString(`\r`)
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case '"':
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b.WriteString(`\"`)
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case '\\':
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b.WriteString(`\\`)
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default:
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intRr := uint16(rr)
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if intRr < 0x001F {
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b.WriteString(fmt.Sprintf("\\u%0.4X", intRr))
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} else {
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b.WriteRune(rr)
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}
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}
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}
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return b.String()
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}
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func tomlValueStringRepresentation(v interface{}, indent string, arraysOneElementPerLine bool) (string, error) {
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switch value := v.(type) {
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case uint64:
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return strconv.FormatUint(value, 10), nil
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case int64:
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return strconv.FormatInt(value, 10), nil
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case float64:
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// Ensure a round float does contain a decimal point. Otherwise feeding
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// the output back to the parser would convert to an integer.
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if math.Trunc(value) == value {
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return strings.ToLower(strconv.FormatFloat(value, 'f', 1, 32)), nil
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}
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return strings.ToLower(strconv.FormatFloat(value, 'f', -1, 32)), nil
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case string:
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return "\"" + encodeTomlString(value) + "\"", nil
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case []byte:
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b, _ := v.([]byte)
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return tomlValueStringRepresentation(string(b), indent, arraysOneElementPerLine)
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case bool:
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if value {
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return "true", nil
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}
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return "false", nil
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case time.Time:
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return value.Format(time.RFC3339), nil
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case nil:
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return "", nil
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}
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rv := reflect.ValueOf(v)
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if rv.Kind() == reflect.Slice {
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var values []string
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for i := 0; i < rv.Len(); i++ {
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item := rv.Index(i).Interface()
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itemRepr, err := tomlValueStringRepresentation(item, indent, arraysOneElementPerLine)
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if err != nil {
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return "", err
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}
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values = append(values, itemRepr)
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}
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if arraysOneElementPerLine && len(values) > 1 {
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stringBuffer := bytes.Buffer{}
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valueIndent := indent + ` ` // TODO: move that to a shared encoder state
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stringBuffer.WriteString("[\n")
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for _, value := range values {
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stringBuffer.WriteString(valueIndent)
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stringBuffer.WriteString(value)
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stringBuffer.WriteString(`,`)
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stringBuffer.WriteString("\n")
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}
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stringBuffer.WriteString(indent + "]")
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return stringBuffer.String(), nil
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}
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return "[" + strings.Join(values, ",") + "]", nil
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}
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return "", fmt.Errorf("unsupported value type %T: %v", v, v)
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}
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func (t *Tree) writeTo(w io.Writer, indent, keyspace string, bytesCount int64, arraysOneElementPerLine bool) (int64, error) {
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simpleValuesKeys := make([]string, 0)
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complexValuesKeys := make([]string, 0)
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for k := range t.values {
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v := t.values[k]
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switch v.(type) {
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case *Tree, []*Tree:
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complexValuesKeys = append(complexValuesKeys, k)
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default:
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simpleValuesKeys = append(simpleValuesKeys, k)
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}
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}
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sort.Strings(simpleValuesKeys)
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sort.Strings(complexValuesKeys)
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for _, k := range simpleValuesKeys {
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v, ok := t.values[k].(*tomlValue)
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if !ok {
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return bytesCount, fmt.Errorf("invalid value type at %s: %T", k, t.values[k])
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}
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repr, err := tomlValueStringRepresentation(v.value, indent, arraysOneElementPerLine)
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if err != nil {
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return bytesCount, err
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}
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if v.comment != "" {
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comment := strings.Replace(v.comment, "\n", "\n"+indent+"#", -1)
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start := "# "
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if strings.HasPrefix(comment, "#") {
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start = ""
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}
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writtenBytesCountComment, errc := writeStrings(w, "\n", indent, start, comment, "\n")
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bytesCount += int64(writtenBytesCountComment)
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if errc != nil {
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return bytesCount, errc
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}
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}
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var commented string
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if v.commented {
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commented = "# "
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}
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writtenBytesCount, err := writeStrings(w, indent, commented, k, " = ", repr, "\n")
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bytesCount += int64(writtenBytesCount)
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if err != nil {
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return bytesCount, err
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}
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}
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for _, k := range complexValuesKeys {
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v := t.values[k]
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combinedKey := k
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if keyspace != "" {
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combinedKey = keyspace + "." + combinedKey
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}
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var commented string
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if t.commented {
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commented = "# "
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}
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switch node := v.(type) {
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// node has to be of those two types given how keys are sorted above
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case *Tree:
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tv, ok := t.values[k].(*Tree)
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if !ok {
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return bytesCount, fmt.Errorf("invalid value type at %s: %T", k, t.values[k])
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}
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if tv.comment != "" {
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comment := strings.Replace(tv.comment, "\n", "\n"+indent+"#", -1)
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start := "# "
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if strings.HasPrefix(comment, "#") {
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start = ""
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}
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writtenBytesCountComment, errc := writeStrings(w, "\n", indent, start, comment)
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bytesCount += int64(writtenBytesCountComment)
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if errc != nil {
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return bytesCount, errc
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}
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}
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writtenBytesCount, err := writeStrings(w, "\n", indent, commented, "[", combinedKey, "]\n")
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bytesCount += int64(writtenBytesCount)
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if err != nil {
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return bytesCount, err
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}
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bytesCount, err = node.writeTo(w, indent+" ", combinedKey, bytesCount, arraysOneElementPerLine)
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if err != nil {
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return bytesCount, err
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}
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case []*Tree:
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for _, subTree := range node {
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writtenBytesCount, err := writeStrings(w, "\n", indent, commented, "[[", combinedKey, "]]\n")
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bytesCount += int64(writtenBytesCount)
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if err != nil {
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return bytesCount, err
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}
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bytesCount, err = subTree.writeTo(w, indent+" ", combinedKey, bytesCount, arraysOneElementPerLine)
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if err != nil {
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return bytesCount, err
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}
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}
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}
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}
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return bytesCount, nil
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}
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func writeStrings(w io.Writer, s ...string) (int, error) {
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var n int
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for i := range s {
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b, err := io.WriteString(w, s[i])
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n += b
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if err != nil {
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return n, err
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}
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}
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return n, nil
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}
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// WriteTo encode the Tree as Toml and writes it to the writer w.
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// Returns the number of bytes written in case of success, or an error if anything happened.
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func (t *Tree) WriteTo(w io.Writer) (int64, error) {
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return t.writeTo(w, "", "", 0, false)
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}
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// ToTomlString generates a human-readable representation of the current tree.
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// Output spans multiple lines, and is suitable for ingest by a TOML parser.
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// If the conversion cannot be performed, ToString returns a non-nil error.
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func (t *Tree) ToTomlString() (string, error) {
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var buf bytes.Buffer
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_, err := t.WriteTo(&buf)
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if err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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// String generates a human-readable representation of the current tree.
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// Alias of ToString. Present to implement the fmt.Stringer interface.
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func (t *Tree) String() string {
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result, _ := t.ToTomlString()
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return result
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}
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// ToMap recursively generates a representation of the tree using Go built-in structures.
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// The following types are used:
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//
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// * bool
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// * float64
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// * int64
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// * string
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// * uint64
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// * time.Time
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// * map[string]interface{} (where interface{} is any of this list)
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// * []interface{} (where interface{} is any of this list)
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func (t *Tree) ToMap() map[string]interface{} {
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result := map[string]interface{}{}
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for k, v := range t.values {
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switch node := v.(type) {
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case []*Tree:
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var array []interface{}
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for _, item := range node {
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array = append(array, item.ToMap())
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}
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result[k] = array
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case *Tree:
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result[k] = node.ToMap()
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case *tomlValue:
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result[k] = node.value
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}
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}
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return result
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}
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