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config.go
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config.go
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package hocon
import (
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
// Type of an hocon Value
type Type int
// Type constants
const (
ObjectType Type = iota
StringType
ArrayType
NumberType
BooleanType
NullType
SubstitutionType
ConcatenationType
valueWithAlternativeType
)
// Config stores the root of the configuration tree
// and provides an API to retrieve configuration values with the path expressions
type Config struct {
root Value
}
// String method returns the string representation of the Config object
func (c *Config) String() string { return c.root.String() }
// GetRoot method returns the root value of the configuration
func (c *Config) GetRoot() Value {
return c.root
}
// GetObject method finds the value at the given path and returns it as an Object, returns nil if the value is not found
func (c *Config) GetObject(path string) Object {
value := c.Get(path)
if value == nil {
return nil
}
return value.(Object)
}
// GetConfig method finds the value at the given path and returns it as a Config, returns nil if the value is not found
func (c *Config) GetConfig(path string) *Config {
value := c.GetObject(path)
if value == nil {
return nil
}
return value.ToConfig()
}
// GetStringMap method finds the value at the given path and returns it as a map[string]Value
// returns nil if the value is not found
func (c *Config) GetStringMap(path string) map[string]Value {
return c.GetObject(path)
}
// GetStringMapString method finds the value at the given path and returns it as a map[string]string
// returns nil if the value is not found
func (c *Config) GetStringMapString(path string) map[string]string {
value := c.Get(path)
if value == nil {
return nil
}
object := value.(Object)
var m = make(map[string]string, len(object))
for k, v := range object {
m[k] = v.String()
}
return m
}
// GetArray method finds the value at the given path and returns it as an Array, returns nil if the value is not found
func (c *Config) GetArray(path string) Array {
value := c.Get(path)
if value == nil {
return nil
}
return value.(Array)
}
// GetIntSlice method finds the value at the given path and returns it as []int, returns nil if the value is not found
func (c *Config) GetIntSlice(path string) []int {
value := c.Get(path)
if value == nil {
return nil
}
arr := value.(Array)
slice := make([]int, 0, len(arr))
for _, v := range arr {
slice = append(slice, int(v.(Int)))
}
return slice
}
// GetStringSlice method finds the value at the given path and returns it as []string
// returns nil if the value is not found
func (c *Config) GetStringSlice(path string) []string {
value := c.Get(path)
if value == nil {
return nil
}
arr := value.(Array)
slice := make([]string, 0, len(arr))
for _, v := range arr {
slice = append(slice, v.String())
}
return slice
}
// GetString method finds the value at the given path and returns it as a String
// returns empty string if the value is not found
func (c *Config) GetString(path string) string {
value := c.Get(path)
if value == nil {
return ""
}
return value.String()
}
// GetInt method finds the value at the given path and returns it as an Int, returns zero if the value is not found
func (c *Config) GetInt(path string) int {
value := c.Get(path)
if value == nil {
return 0
}
switch val := value.(type) {
case Int:
return int(val)
case String:
intValue, err := strconv.Atoi(string(val))
if err != nil {
panic(err)
}
return intValue
default:
panic("cannot parse value: " + val.String() + " to int!")
}
}
// GetFloat32 method finds the value at the given path and returns it as a Float32
// returns float32(0.0) if the value is not found
func (c *Config) GetFloat32(path string) float32 {
value := c.Get(path)
if value == nil {
return float32(0.0)
}
switch val := value.(type) {
case Float32:
return float32(val)
case Float64:
return float32(val)
case String:
floatValue, err := strconv.ParseFloat(string(val), 32)
if err != nil {
panic(err)
}
return float32(floatValue)
default:
panic("cannot parse value: " + val.String() + " to float32!")
}
}
// GetFloat64 method finds the value at the given path and returns it as a Float64
// returns 0.0 if the value is not found
func (c *Config) GetFloat64(path string) float64 {
value := c.Get(path)
if value == nil {
return 0.0
}
switch val := value.(type) {
case Float64:
return float64(val)
case Float32:
return float64(val)
case String:
floatValue, err := strconv.ParseFloat(string(val), 64)
if err != nil {
panic(err)
}
return floatValue
default:
panic("cannot parse value: " + val.String() + "to float64!")
}
}
// GetBoolean method finds the value at the given path and returns it as a Boolean
// returns false if the value is not found
func (c *Config) GetBoolean(path string) bool {
value := c.Get(path)
if value == nil {
return false
}
switch val := value.(type) {
case Boolean:
return bool(val)
case String:
switch val {
case "true", "yes", "on":
return true
case "false", "no", "off":
return false
default:
panic("cannot parse value: " + val + " to boolean!")
}
default:
panic("cannot parse value: " + val.String() + " to boolean!")
}
}
// GetDuration method finds the value at the given path and returns it as a time.Duration
// returns 0 if the value is not found
func (c *Config) GetDuration(path string) time.Duration {
value := c.Get(path)
if value == nil {
return 0
}
return time.Duration(value.(Duration))
}
// Get method finds the value at the given path and returns it without casting to any type
// returns nil if the value is not found
func (c *Config) Get(path string) Value {
if c.root.Type() != ObjectType {
return nil
}
return c.root.(Object).find(path)
}
// WithFallback method returns a new *Config (or the current config, if the given fallback doesn't get used)
// 1. merges the values of the current and fallback *Configs, if the root of both of them are of type Object
// for the same keys current values overrides the fallback values
// 2. if any of the *Configs has non-object root then returns the current *Config ignoring the fallback parameter
func (c *Config) WithFallback(fallback *Config) *Config {
if current, ok := c.root.(Object); ok {
if fallbackObject, ok := fallback.root.(Object); ok {
resultConfig := fallbackObject.copy()
mergeObjects(resultConfig, current)
return resultConfig.ToConfig()
}
}
return c
}
// Value interface represents a value in the configuration tree, all the value types implements this interface
type Value interface {
Type() Type
String() string
isConcatenable() bool
}
// String represents a string value
type String string
// Type String
func (s String) Type() Type { return StringType }
func (s String) String() string {
str := strings.Trim(string(s), `"`)
if str == "" {
return `""`
}
compile := regexp.MustCompile("[ !\\\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~]+")
if compile.MatchString(str) {
return fmt.Sprintf(`"%s"`, str)
}
return str
}
func (s String) isConcatenable() bool { return true }
// valueWithAlternative represents a value with Substitution which might override the original value
type valueWithAlternative struct {
value Value
alternative *Substitution
}
func (s *valueWithAlternative) Type() Type { return valueWithAlternativeType }
func (s *valueWithAlternative) String() string {
return fmt.Sprintf("(%s | %s)", s.value, s.alternative.String())
}
func (s *valueWithAlternative) isConcatenable() bool { return false }
// Object represents an object node in the configuration tree
type Object map[string]Value
// Type Object
func (o Object) Type() Type { return ObjectType }
func (o Object) isConcatenable() bool { return false }
// String method returns the string representation of the Object
func (o Object) String() string {
var builder strings.Builder
itemsSize := len(o)
i := 1
builder.WriteString(objectStartToken)
for key, value := range o {
builder.WriteString(key)
builder.WriteString(colonToken)
builder.WriteString(value.String())
if i < itemsSize {
builder.WriteString(", ")
}
i++
}
builder.WriteString(objectEndToken)
return builder.String()
}
// ToConfig method converts object to *Config
func (o Object) ToConfig() *Config {
return &Config{o}
}
func (o Object) find(path string) Value {
keys := strings.Split(path, dotToken)
size := len(keys)
lastKey := keys[size-1]
keysWithoutLast := keys[:size-1]
object := o
for _, key := range keysWithoutLast {
value, ok := object[key]
if !ok {
return nil
}
object = value.(Object)
}
return object[lastKey]
}
func (o Object) copy() Object {
result := Object{}
for k, v := range o {
subObject, ok := v.(Object)
if ok {
result[k] = subObject.copy()
} else {
result[k] = v
}
}
return result
}
// Array represents an array node in the configuration tree
type Array []Value
// Type Array
func (a Array) Type() Type { return ArrayType }
func (a Array) isConcatenable() bool { return false }
// String method returns the string representation of the Array
func (a Array) String() string {
if len(a) == 0 {
return "[]"
}
var builder strings.Builder
builder.WriteString(arrayStartToken)
builder.WriteString(a[0].String())
for _, value := range a[1:] {
builder.WriteString(commaToken)
builder.WriteString(value.String())
}
builder.WriteString(arrayEndToken)
return builder.String()
}
// Int represents an Integer value
type Int int
// Type Number
func (i Int) Type() Type { return NumberType }
func (i Int) String() string { return strconv.Itoa(int(i)) }
func (i Int) isConcatenable() bool { return true }
// Float32 represents a Float32 value
type Float32 float32
// Type Number
func (f Float32) Type() Type { return NumberType }
func (f Float32) String() string { return strconv.FormatFloat(float64(f), 'e', -1, 32) }
func (f Float32) isConcatenable() bool { return false }
// Float64 represents a Float64 value
type Float64 float64
// Type Number
func (f Float64) Type() Type { return NumberType }
func (f Float64) String() string { return strconv.FormatFloat(float64(f), 'e', -1, 64) }
func (f Float64) isConcatenable() bool { return false }
// Boolean represents bool value
type Boolean bool
func newBooleanFromString(value string) Boolean {
switch value {
case "true", "yes", "on":
return true
case "false", "no", "off":
return false
default:
panic(fmt.Sprintf("cannot parse value: %s to Boolean!", value))
}
}
// Type Boolean
func (b Boolean) Type() Type { return BooleanType }
func (b Boolean) String() string { return strconv.FormatBool(bool(b)) }
func (b Boolean) isConcatenable() bool { return true }
// Substitution refers to another value in the configuration tree
type Substitution struct {
path string
optional bool
}
// Type Substitution
func (s *Substitution) Type() Type { return SubstitutionType }
func (s *Substitution) isConcatenable() bool { return true }
// String method returns the string representation of the Substitution
func (s *Substitution) String() string {
var builder strings.Builder
builder.WriteString("${")
if s.optional {
builder.WriteString("?")
}
builder.WriteString(s.path)
builder.WriteString("}")
return builder.String()
}
// Null represents a null value
type Null string
const null Null = "null"
// Type Null
func (n Null) Type() Type { return NullType }
func (n Null) String() string { return string(null) }
func (n Null) isConcatenable() bool { return true }
// Duration represents a duration value
type Duration time.Duration
// Type Duration
func (d Duration) Type() Type { return StringType }
func (d Duration) String() string { return time.Duration(d).String() }
func (d Duration) isConcatenable() bool { return false }
type concatenation Array
func (c concatenation) Type() Type { return ConcatenationType }
func (c concatenation) isConcatenable() bool { return true }
func (c concatenation) containsObject() bool {
for _, value := range c {
if value.Type() == ObjectType {
return true
}
}
return false
}
func (c concatenation) String() string {
var builder strings.Builder
for _, value := range c {
builder.WriteString(value.String())
}
return builder.String()
}