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