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package toml
// Tools to convert a TomlTree to different representations
import (
"fmt"
"strconv"
"strings"
"time"
)
// encodes a string to a TOML-compliant string value
func encodeTomlString(value string) string {
result := ""
for _, rr := range value {
intRr := uint16(rr)
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:
if intRr < 0x001F {
result += fmt.Sprintf("\\u%0.4X", intRr)
} else {
result += string(rr)
}
}
}
return result
}
// Value print support function for ToString()
// Outputs the TOML compliant string representation of a value
func toTomlValue(item interface{}, indent int) string {
tab := strings.Repeat(" ", indent)
switch value := item.(type) {
case int:
return tab + strconv.FormatInt(int64(value), 10)
case int8:
return tab + strconv.FormatInt(int64(value), 10)
case int16:
return tab + strconv.FormatInt(int64(value), 10)
case int32:
return tab + strconv.FormatInt(int64(value), 10)
case int64:
return tab + strconv.FormatInt(value, 10)
case uint:
return tab + strconv.FormatUint(uint64(value), 10)
case uint8:
return tab + strconv.FormatUint(uint64(value), 10)
case uint16:
return tab + strconv.FormatUint(uint64(value), 10)
case uint32:
return tab + strconv.FormatUint(uint64(value), 10)
case uint64:
return tab + strconv.FormatUint(value, 10)
case float32:
return tab + strconv.FormatFloat(float64(value), 'f', -1, 32)
case float64:
return tab + strconv.FormatFloat(value, 'f', -1, 64)
case string:
return tab + "\"" + encodeTomlString(value) + "\""
case bool:
if value {
return "true"
}
return "false"
case time.Time:
return tab + value.Format(time.RFC3339)
case []interface{}:
values := []string{}
for _, item := range value {
values = append(values, toTomlValue(item, 0))
}
return "[" + strings.Join(values, ",") + "]"
case nil:
return ""
default:
panic(fmt.Errorf("unsupported value type %T: %v", value, value))
}
}
// Recursive support function for ToString()
// Outputs a tree, using the provided keyspace to prefix table names
func (t *TomlTree) toToml(indent, keyspace string) string {
resultChunks := []string{}
for k, v := range t.values {
// figure out the keyspace
combinedKey := k
if keyspace != "" {
combinedKey = keyspace + "." + combinedKey
}
resultChunk := ""
// output based on type
switch node := v.(type) {
case []*TomlTree:
for _, item := range node {
if len(item.Keys()) > 0 {
resultChunk += fmt.Sprintf("\n%s[[%s]]\n", indent, combinedKey)
}
resultChunk += item.toToml(indent+" ", combinedKey)
}
resultChunks = append(resultChunks, resultChunk)
case *TomlTree:
if len(node.Keys()) > 0 {
resultChunk += fmt.Sprintf("\n%s[%s]\n", indent, combinedKey)
}
resultChunk += node.toToml(indent+" ", combinedKey)
resultChunks = append(resultChunks, resultChunk)
case map[string]interface{}:
sub := TreeFromMap(node)
if len(sub.Keys()) > 0 {
resultChunk += fmt.Sprintf("\n%s[%s]\n", indent, combinedKey)
}
resultChunk += sub.toToml(indent+" ", combinedKey)
resultChunks = append(resultChunks, resultChunk)
case map[string]string:
sub := TreeFromMap(convertMapStringString(node))
if len(sub.Keys()) > 0 {
resultChunk += fmt.Sprintf("\n%s[%s]\n", indent, combinedKey)
}
resultChunk += sub.toToml(indent+" ", combinedKey)
resultChunks = append(resultChunks, resultChunk)
case map[interface{}]interface{}:
sub := TreeFromMap(convertMapInterfaceInterface(node))
if len(sub.Keys()) > 0 {
resultChunk += fmt.Sprintf("\n%s[%s]\n", indent, combinedKey)
}
resultChunk += sub.toToml(indent+" ", combinedKey)
resultChunks = append(resultChunks, resultChunk)
case *tomlValue:
resultChunk = fmt.Sprintf("%s%s = %s\n", indent, k, toTomlValue(node.value, 0))
resultChunks = append([]string{resultChunk}, resultChunks...)
default:
resultChunk = fmt.Sprintf("%s%s = %s\n", indent, k, toTomlValue(v, 0))
resultChunks = append([]string{resultChunk}, resultChunks...)
}
}
return strings.Join(resultChunks, "")
}
// Same as ToToml(), but does not panic and returns an error
func (t *TomlTree) toTomlSafe(indent, keyspace string) (result string, err error) {
defer func() {
if r := recover(); r != nil {
result = ""
switch x := r.(type) {
case error:
err = x
default:
err = fmt.Errorf("unknown panic: %s", r)
}
}
}()
result = t.toToml(indent, keyspace)
return
}
func convertMapStringString(in map[string]string) map[string]interface{} {
result := make(map[string]interface{}, len(in))
for k, v := range in {
result[k] = v
}
return result
}
func convertMapInterfaceInterface(in map[interface{}]interface{}) map[string]interface{} {
result := make(map[string]interface{}, len(in))
for k, v := range in {
result[k.(string)] = v
}
return result
}
// ToString 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) ToString() (string, error) {
return t.toTomlSafe("", "")
}
// String generates a human-readable representation of the current tree.
// Alias of ToString.
func (t *TomlTree) String() string {
result, _ := t.ToString()
return result
}
// ToMap recursively generates a representation of the current tree using map[string]interface{}.
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 map[string]interface{}:
sub := TreeFromMap(node)
result[k] = sub.ToMap()
case *tomlValue:
result[k] = node.value
}
}
return result
}
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