610 lines
17 KiB
Go
610 lines
17 KiB
Go
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package toml
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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const tagKeyMultiline = "multiline"
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type tomlOpts struct {
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name string
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comment string
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commented bool
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multiline bool
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include bool
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omitempty bool
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}
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type encOpts struct {
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quoteMapKeys bool
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arraysOneElementPerLine bool
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}
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var encOptsDefaults = encOpts{
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quoteMapKeys: false,
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}
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var timeType = reflect.TypeOf(time.Time{})
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var marshalerType = reflect.TypeOf(new(Marshaler)).Elem()
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// Check if the given marshall type maps to a Tree primitive
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func isPrimitive(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isPrimitive(mtype.Elem())
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case reflect.Bool:
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return true
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return true
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return true
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case reflect.Float32, reflect.Float64:
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return true
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case reflect.String:
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return true
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case reflect.Struct:
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return mtype == timeType || isCustomMarshaler(mtype)
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default:
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return false
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}
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}
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// Check if the given marshall type maps to a Tree slice
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func isTreeSlice(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Slice:
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return !isOtherSlice(mtype)
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default:
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return false
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}
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}
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// Check if the given marshall type maps to a non-Tree slice
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func isOtherSlice(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isOtherSlice(mtype.Elem())
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case reflect.Slice:
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return isPrimitive(mtype.Elem()) || isOtherSlice(mtype.Elem())
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default:
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return false
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}
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}
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// Check if the given marshall type maps to a Tree
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func isTree(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Map:
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return true
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case reflect.Struct:
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return !isPrimitive(mtype)
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default:
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return false
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}
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}
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func isCustomMarshaler(mtype reflect.Type) bool {
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return mtype.Implements(marshalerType)
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}
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func callCustomMarshaler(mval reflect.Value) ([]byte, error) {
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return mval.Interface().(Marshaler).MarshalTOML()
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}
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// Marshaler is the interface implemented by types that
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// can marshal themselves into valid TOML.
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type Marshaler interface {
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MarshalTOML() ([]byte, error)
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}
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/*
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Marshal returns the TOML encoding of v. Behavior is similar to the Go json
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encoder, except that there is no concept of a Marshaler interface or MarshalTOML
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function for sub-structs, and currently only definite types can be marshaled
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(i.e. no `interface{}`).
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The following struct annotations are supported:
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toml:"Field" Overrides the field's name to output.
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omitempty When set, empty values and groups are not emitted.
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comment:"comment" Emits a # comment on the same line. This supports new lines.
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commented:"true" Emits the value as commented.
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Note that pointers are automatically assigned the "omitempty" option, as TOML
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explicitly does not handle null values (saying instead the label should be
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dropped).
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Tree structural types and corresponding marshal types:
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*Tree (*)struct, (*)map[string]interface{}
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[]*Tree (*)[](*)struct, (*)[](*)map[string]interface{}
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[]interface{} (as interface{}) (*)[]primitive, (*)[]([]interface{})
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interface{} (*)primitive
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Tree primitive types and corresponding marshal types:
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uint64 uint, uint8-uint64, pointers to same
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int64 int, int8-uint64, pointers to same
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float64 float32, float64, pointers to same
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string string, pointers to same
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bool bool, pointers to same
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time.Time time.Time{}, pointers to same
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*/
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func Marshal(v interface{}) ([]byte, error) {
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return NewEncoder(nil).marshal(v)
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}
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// Encoder writes TOML values to an output stream.
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type Encoder struct {
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w io.Writer
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encOpts
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}
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// NewEncoder returns a new encoder that writes to w.
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func NewEncoder(w io.Writer) *Encoder {
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return &Encoder{
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w: w,
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encOpts: encOptsDefaults,
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}
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}
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// Encode writes the TOML encoding of v to the stream.
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//
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// See the documentation for Marshal for details.
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func (e *Encoder) Encode(v interface{}) error {
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b, err := e.marshal(v)
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if err != nil {
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return err
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}
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if _, err := e.w.Write(b); err != nil {
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return err
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}
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return nil
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}
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// QuoteMapKeys sets up the encoder to encode
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// maps with string type keys with quoted TOML keys.
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//
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// This relieves the character limitations on map keys.
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func (e *Encoder) QuoteMapKeys(v bool) *Encoder {
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e.quoteMapKeys = v
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return e
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}
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// ArraysWithOneElementPerLine sets up the encoder to encode arrays
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// with more than one element on multiple lines instead of one.
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//
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// For example:
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//
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// A = [1,2,3]
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//
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// Becomes
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//
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// A = [
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// 1,
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// 2,
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// 3,
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// ]
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func (e *Encoder) ArraysWithOneElementPerLine(v bool) *Encoder {
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e.arraysOneElementPerLine = v
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return e
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}
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func (e *Encoder) marshal(v interface{}) ([]byte, error) {
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mtype := reflect.TypeOf(v)
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if mtype.Kind() != reflect.Struct {
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return []byte{}, errors.New("Only a struct can be marshaled to TOML")
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}
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sval := reflect.ValueOf(v)
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if isCustomMarshaler(mtype) {
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return callCustomMarshaler(sval)
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}
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t, err := e.valueToTree(mtype, sval)
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if err != nil {
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return []byte{}, err
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}
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var buf bytes.Buffer
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_, err = t.writeTo(&buf, "", "", 0, e.arraysOneElementPerLine)
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return buf.Bytes(), err
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}
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// Convert given marshal struct or map value to toml tree
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func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, error) {
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if mtype.Kind() == reflect.Ptr {
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return e.valueToTree(mtype.Elem(), mval.Elem())
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}
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tval := newTree()
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switch mtype.Kind() {
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case reflect.Struct:
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for i := 0; i < mtype.NumField(); i++ {
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mtypef, mvalf := mtype.Field(i), mval.Field(i)
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opts := tomlOptions(mtypef)
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if opts.include && (!opts.omitempty || !isZero(mvalf)) {
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val, err := e.valueToToml(mtypef.Type, mvalf)
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if err != nil {
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return nil, err
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}
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tval.SetWithOptions(opts.name, SetOptions{
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Comment: opts.comment,
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Commented: opts.commented,
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Multiline: opts.multiline,
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}, val)
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}
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}
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case reflect.Map:
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for _, key := range mval.MapKeys() {
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mvalf := mval.MapIndex(key)
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val, err := e.valueToToml(mtype.Elem(), mvalf)
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if err != nil {
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return nil, err
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}
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if e.quoteMapKeys {
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keyStr, err := tomlValueStringRepresentation(key.String(), "", e.arraysOneElementPerLine)
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if err != nil {
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return nil, err
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}
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tval.SetPath([]string{keyStr}, val)
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} else {
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tval.Set(key.String(), val)
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}
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}
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}
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return tval, nil
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}
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// Convert given marshal slice to slice of Toml trees
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func (e *Encoder) valueToTreeSlice(mtype reflect.Type, mval reflect.Value) ([]*Tree, error) {
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tval := make([]*Tree, mval.Len(), mval.Len())
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for i := 0; i < mval.Len(); i++ {
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val, err := e.valueToTree(mtype.Elem(), mval.Index(i))
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if err != nil {
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return nil, err
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}
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tval[i] = val
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}
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return tval, nil
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}
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// Convert given marshal slice to slice of toml values
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func (e *Encoder) valueToOtherSlice(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
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tval := make([]interface{}, mval.Len(), mval.Len())
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for i := 0; i < mval.Len(); i++ {
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val, err := e.valueToToml(mtype.Elem(), mval.Index(i))
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if err != nil {
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return nil, err
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}
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tval[i] = val
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}
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return tval, nil
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}
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// Convert given marshal value to toml value
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func (e *Encoder) valueToToml(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
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if mtype.Kind() == reflect.Ptr {
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return e.valueToToml(mtype.Elem(), mval.Elem())
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}
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switch {
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case isCustomMarshaler(mtype):
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return callCustomMarshaler(mval)
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case isTree(mtype):
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return e.valueToTree(mtype, mval)
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case isTreeSlice(mtype):
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return e.valueToTreeSlice(mtype, mval)
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case isOtherSlice(mtype):
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return e.valueToOtherSlice(mtype, mval)
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default:
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switch mtype.Kind() {
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case reflect.Bool:
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return mval.Bool(), nil
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return mval.Int(), nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return mval.Uint(), nil
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case reflect.Float32, reflect.Float64:
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return mval.Float(), nil
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case reflect.String:
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return mval.String(), nil
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case reflect.Struct:
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return mval.Interface().(time.Time), nil
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default:
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return nil, fmt.Errorf("Marshal can't handle %v(%v)", mtype, mtype.Kind())
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}
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}
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}
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// Unmarshal attempts to unmarshal the Tree into a Go struct pointed by v.
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// Neither Unmarshaler interfaces nor UnmarshalTOML functions are supported for
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// sub-structs, and only definite types can be unmarshaled.
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func (t *Tree) Unmarshal(v interface{}) error {
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d := Decoder{tval: t}
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return d.unmarshal(v)
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}
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// Marshal returns the TOML encoding of Tree.
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// See Marshal() documentation for types mapping table.
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func (t *Tree) Marshal() ([]byte, error) {
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var buf bytes.Buffer
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err := NewEncoder(&buf).Encode(t)
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return buf.Bytes(), err
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}
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// Unmarshal parses the TOML-encoded data and stores the result in the value
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// pointed to by v. Behavior is similar to the Go json encoder, except that there
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// is no concept of an Unmarshaler interface or UnmarshalTOML function for
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// sub-structs, and currently only definite types can be unmarshaled to (i.e. no
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// `interface{}`).
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//
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// The following struct annotations are supported:
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//
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// toml:"Field" Overrides the field's name to map to.
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//
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// See Marshal() documentation for types mapping table.
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func Unmarshal(data []byte, v interface{}) error {
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t, err := LoadReader(bytes.NewReader(data))
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if err != nil {
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return err
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}
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return t.Unmarshal(v)
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}
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// Decoder reads and decodes TOML values from an input stream.
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type Decoder struct {
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r io.Reader
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tval *Tree
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encOpts
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}
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// NewDecoder returns a new decoder that reads from r.
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func NewDecoder(r io.Reader) *Decoder {
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return &Decoder{
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r: r,
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encOpts: encOptsDefaults,
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}
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}
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// Decode reads a TOML-encoded value from it's input
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// and unmarshals it in the value pointed at by v.
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//
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// See the documentation for Marshal for details.
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func (d *Decoder) Decode(v interface{}) error {
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var err error
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d.tval, err = LoadReader(d.r)
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if err != nil {
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return err
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}
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return d.unmarshal(v)
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}
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func (d *Decoder) unmarshal(v interface{}) error {
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mtype := reflect.TypeOf(v)
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if mtype.Kind() != reflect.Ptr || mtype.Elem().Kind() != reflect.Struct {
|
||
|
|
return errors.New("Only a pointer to struct can be unmarshaled from TOML")
|
||
|
|
}
|
||
|
|
|
||
|
|
sval, err := d.valueFromTree(mtype.Elem(), d.tval)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
reflect.ValueOf(v).Elem().Set(sval)
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert toml tree to marshal struct or map, using marshal type
|
||
|
|
func (d *Decoder) valueFromTree(mtype reflect.Type, tval *Tree) (reflect.Value, error) {
|
||
|
|
if mtype.Kind() == reflect.Ptr {
|
||
|
|
return d.unwrapPointer(mtype, tval)
|
||
|
|
}
|
||
|
|
var mval reflect.Value
|
||
|
|
switch mtype.Kind() {
|
||
|
|
case reflect.Struct:
|
||
|
|
mval = reflect.New(mtype).Elem()
|
||
|
|
for i := 0; i < mtype.NumField(); i++ {
|
||
|
|
mtypef := mtype.Field(i)
|
||
|
|
opts := tomlOptions(mtypef)
|
||
|
|
if opts.include {
|
||
|
|
baseKey := opts.name
|
||
|
|
keysToTry := []string{baseKey, strings.ToLower(baseKey), strings.ToTitle(baseKey)}
|
||
|
|
for _, key := range keysToTry {
|
||
|
|
exists := tval.Has(key)
|
||
|
|
if !exists {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
val := tval.Get(key)
|
||
|
|
mvalf, err := d.valueFromToml(mtypef.Type, val)
|
||
|
|
if err != nil {
|
||
|
|
return mval, formatError(err, tval.GetPosition(key))
|
||
|
|
}
|
||
|
|
mval.Field(i).Set(mvalf)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
case reflect.Map:
|
||
|
|
mval = reflect.MakeMap(mtype)
|
||
|
|
for _, key := range tval.Keys() {
|
||
|
|
// TODO: path splits key
|
||
|
|
val := tval.GetPath([]string{key})
|
||
|
|
mvalf, err := d.valueFromToml(mtype.Elem(), val)
|
||
|
|
if err != nil {
|
||
|
|
return mval, formatError(err, tval.GetPosition(key))
|
||
|
|
}
|
||
|
|
mval.SetMapIndex(reflect.ValueOf(key), mvalf)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return mval, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert toml value to marshal struct/map slice, using marshal type
|
||
|
|
func (d *Decoder) valueFromTreeSlice(mtype reflect.Type, tval []*Tree) (reflect.Value, error) {
|
||
|
|
mval := reflect.MakeSlice(mtype, len(tval), len(tval))
|
||
|
|
for i := 0; i < len(tval); i++ {
|
||
|
|
val, err := d.valueFromTree(mtype.Elem(), tval[i])
|
||
|
|
if err != nil {
|
||
|
|
return mval, err
|
||
|
|
}
|
||
|
|
mval.Index(i).Set(val)
|
||
|
|
}
|
||
|
|
return mval, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert toml value to marshal primitive slice, using marshal type
|
||
|
|
func (d *Decoder) valueFromOtherSlice(mtype reflect.Type, tval []interface{}) (reflect.Value, error) {
|
||
|
|
mval := reflect.MakeSlice(mtype, len(tval), len(tval))
|
||
|
|
for i := 0; i < len(tval); i++ {
|
||
|
|
val, err := d.valueFromToml(mtype.Elem(), tval[i])
|
||
|
|
if err != nil {
|
||
|
|
return mval, err
|
||
|
|
}
|
||
|
|
mval.Index(i).Set(val)
|
||
|
|
}
|
||
|
|
return mval, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert toml value to marshal value, using marshal type
|
||
|
|
func (d *Decoder) valueFromToml(mtype reflect.Type, tval interface{}) (reflect.Value, error) {
|
||
|
|
if mtype.Kind() == reflect.Ptr {
|
||
|
|
return d.unwrapPointer(mtype, tval)
|
||
|
|
}
|
||
|
|
|
||
|
|
switch tval.(type) {
|
||
|
|
case *Tree:
|
||
|
|
if isTree(mtype) {
|
||
|
|
return d.valueFromTree(mtype, tval.(*Tree))
|
||
|
|
}
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a tree", tval, tval)
|
||
|
|
case []*Tree:
|
||
|
|
if isTreeSlice(mtype) {
|
||
|
|
return d.valueFromTreeSlice(mtype, tval.([]*Tree))
|
||
|
|
}
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to trees", tval, tval)
|
||
|
|
case []interface{}:
|
||
|
|
if isOtherSlice(mtype) {
|
||
|
|
return d.valueFromOtherSlice(mtype, tval.([]interface{}))
|
||
|
|
}
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a slice", tval, tval)
|
||
|
|
default:
|
||
|
|
switch mtype.Kind() {
|
||
|
|
case reflect.Bool, reflect.Struct:
|
||
|
|
val := reflect.ValueOf(tval)
|
||
|
|
// if this passes for when mtype is reflect.Struct, tval is a time.Time
|
||
|
|
if !val.Type().ConvertibleTo(mtype) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
return val.Convert(mtype), nil
|
||
|
|
case reflect.String:
|
||
|
|
val := reflect.ValueOf(tval)
|
||
|
|
// stupidly, int64 is convertible to string. So special case this.
|
||
|
|
if !val.Type().ConvertibleTo(mtype) || val.Kind() == reflect.Int64 {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
return val.Convert(mtype), nil
|
||
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||
|
|
val := reflect.ValueOf(tval)
|
||
|
|
if !val.Type().ConvertibleTo(mtype) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
if reflect.Indirect(reflect.New(mtype)).OverflowInt(val.Int()) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("%v(%T) would overflow %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
return val.Convert(mtype), nil
|
||
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
||
|
|
val := reflect.ValueOf(tval)
|
||
|
|
if !val.Type().ConvertibleTo(mtype) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
if val.Int() < 0 {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("%v(%T) is negative so does not fit in %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
if reflect.Indirect(reflect.New(mtype)).OverflowUint(uint64(val.Int())) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("%v(%T) would overflow %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
return val.Convert(mtype), nil
|
||
|
|
case reflect.Float32, reflect.Float64:
|
||
|
|
val := reflect.ValueOf(tval)
|
||
|
|
if !val.Type().ConvertibleTo(mtype) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
if reflect.Indirect(reflect.New(mtype)).OverflowFloat(val.Float()) {
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("%v(%T) would overflow %v", tval, tval, mtype.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
return val.Convert(mtype), nil
|
||
|
|
default:
|
||
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v(%v)", tval, tval, mtype, mtype.Kind())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) unwrapPointer(mtype reflect.Type, tval interface{}) (reflect.Value, error) {
|
||
|
|
val, err := d.valueFromToml(mtype.Elem(), tval)
|
||
|
|
if err != nil {
|
||
|
|
return reflect.ValueOf(nil), err
|
||
|
|
}
|
||
|
|
mval := reflect.New(mtype.Elem())
|
||
|
|
mval.Elem().Set(val)
|
||
|
|
return mval, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func tomlOptions(vf reflect.StructField) tomlOpts {
|
||
|
|
tag := vf.Tag.Get("toml")
|
||
|
|
parse := strings.Split(tag, ",")
|
||
|
|
var comment string
|
||
|
|
if c := vf.Tag.Get("comment"); c != "" {
|
||
|
|
comment = c
|
||
|
|
}
|
||
|
|
commented, _ := strconv.ParseBool(vf.Tag.Get("commented"))
|
||
|
|
multiline, _ := strconv.ParseBool(vf.Tag.Get(tagKeyMultiline))
|
||
|
|
result := tomlOpts{name: vf.Name, comment: comment, commented: commented, multiline: multiline, include: true, omitempty: false}
|
||
|
|
if parse[0] != "" {
|
||
|
|
if parse[0] == "-" && len(parse) == 1 {
|
||
|
|
result.include = false
|
||
|
|
} else {
|
||
|
|
result.name = strings.Trim(parse[0], " ")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if vf.PkgPath != "" {
|
||
|
|
result.include = false
|
||
|
|
}
|
||
|
|
if len(parse) > 1 && strings.Trim(parse[1], " ") == "omitempty" {
|
||
|
|
result.omitempty = true
|
||
|
|
}
|
||
|
|
if vf.Type.Kind() == reflect.Ptr {
|
||
|
|
result.omitempty = true
|
||
|
|
}
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
func isZero(val reflect.Value) bool {
|
||
|
|
switch val.Type().Kind() {
|
||
|
|
case reflect.Map:
|
||
|
|
fallthrough
|
||
|
|
case reflect.Array:
|
||
|
|
fallthrough
|
||
|
|
case reflect.Slice:
|
||
|
|
return val.Len() == 0
|
||
|
|
default:
|
||
|
|
return reflect.DeepEqual(val.Interface(), reflect.Zero(val.Type()).Interface())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func formatError(err error, pos Position) error {
|
||
|
|
if err.Error()[0] == '(' { // Error already contains position information
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return fmt.Errorf("%s: %s", pos, err)
|
||
|
|
}
|