1270 lines
35 KiB
Go
1270 lines
35 KiB
Go
package toml
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import (
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"bytes"
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"encoding"
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"errors"
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"fmt"
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"io"
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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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const (
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tagFieldName = "toml"
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tagFieldComment = "comment"
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tagCommented = "commented"
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tagMultiline = "multiline"
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tagDefault = "default"
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)
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type tomlOpts struct {
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name string
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nameFromTag bool
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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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defaultValue string
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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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type annotation struct {
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tag string
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comment string
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commented string
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multiline string
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defaultValue string
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}
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var annotationDefault = annotation{
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tag: tagFieldName,
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comment: tagFieldComment,
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commented: tagCommented,
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multiline: tagMultiline,
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defaultValue: tagDefault,
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}
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type marshalOrder int
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// Orders the Encoder can write the fields to the output stream.
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const (
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// Sort fields alphabetically.
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OrderAlphabetical marshalOrder = iota + 1
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// Preserve the order the fields are encountered. For example, the order of fields in
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// a struct.
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OrderPreserve
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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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var unmarshalerType = reflect.TypeOf(new(Unmarshaler)).Elem()
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var textMarshalerType = reflect.TypeOf(new(encoding.TextMarshaler)).Elem()
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var textUnmarshalerType = reflect.TypeOf(new(encoding.TextUnmarshaler)).Elem()
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var localDateType = reflect.TypeOf(LocalDate{})
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var localTimeType = reflect.TypeOf(LocalTime{})
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var localDateTimeType = reflect.TypeOf(LocalDateTime{})
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var mapStringInterfaceType = reflect.TypeOf(map[string]interface{}{})
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// Check if the given marshal 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 isTimeType(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 isTimeType(mtype reflect.Type) bool {
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return mtype == timeType || mtype == localDateType || mtype == localDateTimeType || mtype == localTimeType
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}
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// Check if the given marshal type maps to a Tree slice or array
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func isTreeSequence(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isTreeSequence(mtype.Elem())
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case reflect.Slice, reflect.Array:
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return isTree(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 marshal type maps to a slice or array of a custom marshaler type
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func isCustomMarshalerSequence(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isCustomMarshalerSequence(mtype.Elem())
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case reflect.Slice, reflect.Array:
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return isCustomMarshaler(mtype.Elem()) || isCustomMarshaler(reflect.New(mtype.Elem()).Type())
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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 marshal type maps to a slice or array of a text marshaler type
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func isTextMarshalerSequence(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isTextMarshalerSequence(mtype.Elem())
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case reflect.Slice, reflect.Array:
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return isTextMarshaler(mtype.Elem()) || isTextMarshaler(reflect.New(mtype.Elem()).Type())
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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 marshal type maps to a non-Tree slice or array
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func isOtherSequence(mtype reflect.Type) bool {
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switch mtype.Kind() {
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case reflect.Ptr:
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return isOtherSequence(mtype.Elem())
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case reflect.Slice, reflect.Array:
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return !isTreeSequence(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 marshal 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.Ptr:
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return isTree(mtype.Elem())
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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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func isTextMarshaler(mtype reflect.Type) bool {
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return mtype.Implements(textMarshalerType) && !isTimeType(mtype)
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}
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func callTextMarshaler(mval reflect.Value) ([]byte, error) {
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return mval.Interface().(encoding.TextMarshaler).MarshalText()
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}
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func isCustomUnmarshaler(mtype reflect.Type) bool {
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return mtype.Implements(unmarshalerType)
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}
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func callCustomUnmarshaler(mval reflect.Value, tval interface{}) error {
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return mval.Interface().(Unmarshaler).UnmarshalTOML(tval)
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}
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func isTextUnmarshaler(mtype reflect.Type) bool {
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return mtype.Implements(textUnmarshalerType)
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}
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func callTextUnmarshaler(mval reflect.Value, text []byte) error {
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return mval.Interface().(encoding.TextUnmarshaler).UnmarshalText(text)
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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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// Unmarshaler is the interface implemented by types that
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// can unmarshal a TOML description of themselves.
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type Unmarshaler interface {
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UnmarshalTOML(interface{}) 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.LocalTime time.LocalTime{}, pointers to same
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For additional flexibility, use the Encoder API.
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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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annotation
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line int
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col int
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order marshalOrder
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promoteAnon bool
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indentation string
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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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annotation: annotationDefault,
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line: 0,
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col: 1,
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order: OrderAlphabetical,
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indentation: " ",
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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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return nil
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}
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|
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// QuoteMapKeys sets up the encoder to encode
|
|
// 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 {
|
|
e.quoteMapKeys = v
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return e
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}
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|
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// ArraysWithOneElementPerLine sets up the encoder to encode arrays
|
|
// with more than one element on multiple lines instead of one.
|
|
//
|
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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
|
|
//
|
|
// 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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|
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// Order allows to change in which order fields will be written to the output stream.
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func (e *Encoder) Order(ord marshalOrder) *Encoder {
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e.order = ord
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return e
|
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}
|
|
|
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// Indentation allows to change indentation when marshalling.
|
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func (e *Encoder) Indentation(indent string) *Encoder {
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e.indentation = indent
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return e
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}
|
|
|
|
// SetTagName allows changing default tag "toml"
|
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func (e *Encoder) SetTagName(v string) *Encoder {
|
|
e.tag = v
|
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return e
|
|
}
|
|
|
|
// SetTagComment allows changing default tag "comment"
|
|
func (e *Encoder) SetTagComment(v string) *Encoder {
|
|
e.comment = v
|
|
return e
|
|
}
|
|
|
|
// SetTagCommented allows changing default tag "commented"
|
|
func (e *Encoder) SetTagCommented(v string) *Encoder {
|
|
e.commented = v
|
|
return e
|
|
}
|
|
|
|
// SetTagMultiline allows changing default tag "multiline"
|
|
func (e *Encoder) SetTagMultiline(v string) *Encoder {
|
|
e.multiline = v
|
|
return e
|
|
}
|
|
|
|
// PromoteAnonymous allows to change how anonymous struct fields are marshaled.
|
|
// Usually, they are marshaled as if the inner exported fields were fields in
|
|
// the outer struct. However, if an anonymous struct field is given a name in
|
|
// its TOML tag, it is treated like a regular struct field with that name.
|
|
// rather than being anonymous.
|
|
//
|
|
// In case anonymous promotion is enabled, all anonymous structs are promoted
|
|
// and treated like regular struct fields.
|
|
func (e *Encoder) PromoteAnonymous(promote bool) *Encoder {
|
|
e.promoteAnon = promote
|
|
return e
|
|
}
|
|
|
|
func (e *Encoder) marshal(v interface{}) ([]byte, error) {
|
|
// Check if indentation is valid
|
|
for _, char := range e.indentation {
|
|
if !isSpace(char) {
|
|
return []byte{}, fmt.Errorf("invalid indentation: must only contains space or tab characters")
|
|
}
|
|
}
|
|
|
|
mtype := reflect.TypeOf(v)
|
|
if mtype == nil {
|
|
return []byte{}, errors.New("nil cannot be marshaled to TOML")
|
|
}
|
|
|
|
switch mtype.Kind() {
|
|
case reflect.Struct, reflect.Map:
|
|
case reflect.Ptr:
|
|
if mtype.Elem().Kind() != reflect.Struct {
|
|
return []byte{}, errors.New("Only pointer to struct can be marshaled to TOML")
|
|
}
|
|
if reflect.ValueOf(v).IsNil() {
|
|
return []byte{}, errors.New("nil pointer cannot be marshaled to TOML")
|
|
}
|
|
default:
|
|
return []byte{}, errors.New("Only a struct or map can be marshaled to TOML")
|
|
}
|
|
|
|
sval := reflect.ValueOf(v)
|
|
if isCustomMarshaler(mtype) {
|
|
return callCustomMarshaler(sval)
|
|
}
|
|
if isTextMarshaler(mtype) {
|
|
return callTextMarshaler(sval)
|
|
}
|
|
t, err := e.valueToTree(mtype, sval)
|
|
if err != nil {
|
|
return []byte{}, err
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
_, err = t.writeToOrdered(&buf, "", "", 0, e.arraysOneElementPerLine, e.order, e.indentation, false)
|
|
|
|
return buf.Bytes(), err
|
|
}
|
|
|
|
// Create next tree with a position based on Encoder.line
|
|
func (e *Encoder) nextTree() *Tree {
|
|
return newTreeWithPosition(Position{Line: e.line, Col: 1})
|
|
}
|
|
|
|
// Convert given marshal struct or map value to toml tree
|
|
func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, error) {
|
|
if mtype.Kind() == reflect.Ptr {
|
|
return e.valueToTree(mtype.Elem(), mval.Elem())
|
|
}
|
|
tval := e.nextTree()
|
|
switch mtype.Kind() {
|
|
case reflect.Struct:
|
|
switch mval.Interface().(type) {
|
|
case Tree:
|
|
reflect.ValueOf(tval).Elem().Set(mval)
|
|
default:
|
|
for i := 0; i < mtype.NumField(); i++ {
|
|
mtypef, mvalf := mtype.Field(i), mval.Field(i)
|
|
opts := tomlOptions(mtypef, e.annotation)
|
|
if opts.include && ((mtypef.Type.Kind() != reflect.Interface && !opts.omitempty) || !isZero(mvalf)) {
|
|
val, err := e.valueToToml(mtypef.Type, mvalf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if tree, ok := val.(*Tree); ok && mtypef.Anonymous && !opts.nameFromTag && !e.promoteAnon {
|
|
e.appendTree(tval, tree)
|
|
} else {
|
|
val = e.wrapTomlValue(val, tval)
|
|
tval.SetPathWithOptions([]string{opts.name}, SetOptions{
|
|
Comment: opts.comment,
|
|
Commented: opts.commented,
|
|
Multiline: opts.multiline,
|
|
}, val)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
case reflect.Map:
|
|
keys := mval.MapKeys()
|
|
if e.order == OrderPreserve && len(keys) > 0 {
|
|
// Sorting []reflect.Value is not straight forward.
|
|
//
|
|
// OrderPreserve will support deterministic results when string is used
|
|
// as the key to maps.
|
|
typ := keys[0].Type()
|
|
kind := keys[0].Kind()
|
|
if kind == reflect.String {
|
|
ikeys := make([]string, len(keys))
|
|
for i := range keys {
|
|
ikeys[i] = keys[i].Interface().(string)
|
|
}
|
|
sort.Strings(ikeys)
|
|
for i := range ikeys {
|
|
keys[i] = reflect.ValueOf(ikeys[i]).Convert(typ)
|
|
}
|
|
}
|
|
}
|
|
for _, key := range keys {
|
|
mvalf := mval.MapIndex(key)
|
|
if (mtype.Elem().Kind() == reflect.Ptr || mtype.Elem().Kind() == reflect.Interface) && mvalf.IsNil() {
|
|
continue
|
|
}
|
|
val, err := e.valueToToml(mtype.Elem(), mvalf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
val = e.wrapTomlValue(val, tval)
|
|
if e.quoteMapKeys {
|
|
keyStr, err := tomlValueStringRepresentation(key.String(), "", "", e.order, e.arraysOneElementPerLine)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tval.SetPath([]string{keyStr}, val)
|
|
} else {
|
|
tval.SetPath([]string{key.String()}, val)
|
|
}
|
|
}
|
|
}
|
|
return tval, nil
|
|
}
|
|
|
|
// Convert given marshal slice to slice of Toml trees
|
|
func (e *Encoder) valueToTreeSlice(mtype reflect.Type, mval reflect.Value) ([]*Tree, error) {
|
|
tval := make([]*Tree, mval.Len(), mval.Len())
|
|
for i := 0; i < mval.Len(); i++ {
|
|
val, err := e.valueToTree(mtype.Elem(), mval.Index(i))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tval[i] = val
|
|
}
|
|
return tval, nil
|
|
}
|
|
|
|
// Convert given marshal slice to slice of toml values
|
|
func (e *Encoder) valueToOtherSlice(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
|
|
tval := make([]interface{}, mval.Len(), mval.Len())
|
|
for i := 0; i < mval.Len(); i++ {
|
|
val, err := e.valueToToml(mtype.Elem(), mval.Index(i))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tval[i] = val
|
|
}
|
|
return tval, nil
|
|
}
|
|
|
|
// Convert given marshal value to toml value
|
|
func (e *Encoder) valueToToml(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
|
|
if mtype.Kind() == reflect.Ptr {
|
|
switch {
|
|
case isCustomMarshaler(mtype):
|
|
return callCustomMarshaler(mval)
|
|
case isTextMarshaler(mtype):
|
|
b, err := callTextMarshaler(mval)
|
|
return string(b), err
|
|
default:
|
|
return e.valueToToml(mtype.Elem(), mval.Elem())
|
|
}
|
|
}
|
|
if mtype.Kind() == reflect.Interface {
|
|
return e.valueToToml(mval.Elem().Type(), mval.Elem())
|
|
}
|
|
switch {
|
|
case isCustomMarshaler(mtype):
|
|
return callCustomMarshaler(mval)
|
|
case isTextMarshaler(mtype):
|
|
b, err := callTextMarshaler(mval)
|
|
return string(b), err
|
|
case isTree(mtype):
|
|
return e.valueToTree(mtype, mval)
|
|
case isOtherSequence(mtype), isCustomMarshalerSequence(mtype), isTextMarshalerSequence(mtype):
|
|
return e.valueToOtherSlice(mtype, mval)
|
|
case isTreeSequence(mtype):
|
|
return e.valueToTreeSlice(mtype, mval)
|
|
default:
|
|
switch mtype.Kind() {
|
|
case reflect.Bool:
|
|
return mval.Bool(), nil
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
if mtype.Kind() == reflect.Int64 && mtype == reflect.TypeOf(time.Duration(1)) {
|
|
return fmt.Sprint(mval), nil
|
|
}
|
|
return mval.Int(), nil
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
|
return mval.Uint(), nil
|
|
case reflect.Float32, reflect.Float64:
|
|
return mval.Float(), nil
|
|
case reflect.String:
|
|
return mval.String(), nil
|
|
case reflect.Struct:
|
|
return mval.Interface(), nil
|
|
default:
|
|
return nil, fmt.Errorf("Marshal can't handle %v(%v)", mtype, mtype.Kind())
|
|
}
|
|
}
|
|
}
|
|
|
|
func (e *Encoder) appendTree(t, o *Tree) error {
|
|
for key, value := range o.values {
|
|
if _, ok := t.values[key]; ok {
|
|
continue
|
|
}
|
|
if tomlValue, ok := value.(*tomlValue); ok {
|
|
tomlValue.position.Col = t.position.Col
|
|
}
|
|
t.values[key] = value
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Create a toml value with the current line number as the position line
|
|
func (e *Encoder) wrapTomlValue(val interface{}, parent *Tree) interface{} {
|
|
_, isTree := val.(*Tree)
|
|
_, isTreeS := val.([]*Tree)
|
|
if isTree || isTreeS {
|
|
return val
|
|
}
|
|
|
|
ret := &tomlValue{
|
|
value: val,
|
|
position: Position{
|
|
e.line,
|
|
parent.position.Col,
|
|
},
|
|
}
|
|
e.line++
|
|
return ret
|
|
}
|
|
|
|
// Unmarshal attempts to unmarshal the Tree into a Go struct pointed by v.
|
|
// Neither Unmarshaler interfaces nor UnmarshalTOML functions are supported for
|
|
// sub-structs, and only definite types can be unmarshaled.
|
|
func (t *Tree) Unmarshal(v interface{}) error {
|
|
d := Decoder{tval: t, tagName: tagFieldName}
|
|
return d.unmarshal(v)
|
|
}
|
|
|
|
// Marshal returns the TOML encoding of Tree.
|
|
// See Marshal() documentation for types mapping table.
|
|
func (t *Tree) Marshal() ([]byte, error) {
|
|
var buf bytes.Buffer
|
|
_, err := t.WriteTo(&buf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return buf.Bytes(), nil
|
|
}
|
|
|
|
// Unmarshal parses the TOML-encoded data and stores the result in the value
|
|
// pointed to by v. Behavior is similar to the Go json encoder, except that there
|
|
// is no concept of an Unmarshaler interface or UnmarshalTOML function for
|
|
// sub-structs, and currently only definite types can be unmarshaled to (i.e. no
|
|
// `interface{}`).
|
|
//
|
|
// The following struct annotations are supported:
|
|
//
|
|
// toml:"Field" Overrides the field's name to map to.
|
|
// default:"foo" Provides a default value.
|
|
//
|
|
// For default values, only fields of the following types are supported:
|
|
// * string
|
|
// * bool
|
|
// * int
|
|
// * int64
|
|
// * float64
|
|
//
|
|
// See Marshal() documentation for types mapping table.
|
|
func Unmarshal(data []byte, v interface{}) error {
|
|
t, err := LoadReader(bytes.NewReader(data))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return t.Unmarshal(v)
|
|
}
|
|
|
|
// Decoder reads and decodes TOML values from an input stream.
|
|
type Decoder struct {
|
|
r io.Reader
|
|
tval *Tree
|
|
encOpts
|
|
tagName string
|
|
strict bool
|
|
visitor visitorState
|
|
}
|
|
|
|
// NewDecoder returns a new decoder that reads from r.
|
|
func NewDecoder(r io.Reader) *Decoder {
|
|
return &Decoder{
|
|
r: r,
|
|
encOpts: encOptsDefaults,
|
|
tagName: tagFieldName,
|
|
}
|
|
}
|
|
|
|
// Decode reads a TOML-encoded value from it's input
|
|
// and unmarshals it in the value pointed at by v.
|
|
//
|
|
// See the documentation for Marshal for details.
|
|
func (d *Decoder) Decode(v interface{}) error {
|
|
var err error
|
|
d.tval, err = LoadReader(d.r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return d.unmarshal(v)
|
|
}
|
|
|
|
// SetTagName allows changing default tag "toml"
|
|
func (d *Decoder) SetTagName(v string) *Decoder {
|
|
d.tagName = v
|
|
return d
|
|
}
|
|
|
|
// Strict allows changing to strict decoding. Any fields that are found in the
|
|
// input data and do not have a corresponding struct member cause an error.
|
|
func (d *Decoder) Strict(strict bool) *Decoder {
|
|
d.strict = strict
|
|
return d
|
|
}
|
|
|
|
func (d *Decoder) unmarshal(v interface{}) error {
|
|
mtype := reflect.TypeOf(v)
|
|
if mtype == nil {
|
|
return errors.New("nil cannot be unmarshaled from TOML")
|
|
}
|
|
if mtype.Kind() != reflect.Ptr {
|
|
return errors.New("only a pointer to struct or map can be unmarshaled from TOML")
|
|
}
|
|
|
|
elem := mtype.Elem()
|
|
|
|
switch elem.Kind() {
|
|
case reflect.Struct, reflect.Map:
|
|
case reflect.Interface:
|
|
elem = mapStringInterfaceType
|
|
default:
|
|
return errors.New("only a pointer to struct or map can be unmarshaled from TOML")
|
|
}
|
|
|
|
if reflect.ValueOf(v).IsNil() {
|
|
return errors.New("nil pointer cannot be unmarshaled from TOML")
|
|
}
|
|
|
|
vv := reflect.ValueOf(v).Elem()
|
|
|
|
if d.strict {
|
|
d.visitor = newVisitorState(d.tval)
|
|
}
|
|
|
|
sval, err := d.valueFromTree(elem, d.tval, &vv)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := d.visitor.validate(); err != nil {
|
|
return err
|
|
}
|
|
reflect.ValueOf(v).Elem().Set(sval)
|
|
return nil
|
|
}
|
|
|
|
// Convert toml tree to marshal struct or map, using marshal type. When mval1
|
|
// is non-nil, merge fields into the given value instead of allocating a new one.
|
|
func (d *Decoder) valueFromTree(mtype reflect.Type, tval *Tree, mval1 *reflect.Value) (reflect.Value, error) {
|
|
if mtype.Kind() == reflect.Ptr {
|
|
return d.unwrapPointer(mtype, tval, mval1)
|
|
}
|
|
|
|
// Check if pointer to value implements the Unmarshaler interface.
|
|
if mvalPtr := reflect.New(mtype); isCustomUnmarshaler(mvalPtr.Type()) {
|
|
d.visitor.visitAll()
|
|
|
|
if tval == nil {
|
|
return mvalPtr.Elem(), nil
|
|
}
|
|
|
|
if err := callCustomUnmarshaler(mvalPtr, tval.ToMap()); err != nil {
|
|
return reflect.ValueOf(nil), fmt.Errorf("unmarshal toml: %v", err)
|
|
}
|
|
return mvalPtr.Elem(), nil
|
|
}
|
|
|
|
var mval reflect.Value
|
|
switch mtype.Kind() {
|
|
case reflect.Struct:
|
|
if mval1 != nil {
|
|
mval = *mval1
|
|
} else {
|
|
mval = reflect.New(mtype).Elem()
|
|
}
|
|
|
|
switch mval.Interface().(type) {
|
|
case Tree:
|
|
mval.Set(reflect.ValueOf(tval).Elem())
|
|
default:
|
|
for i := 0; i < mtype.NumField(); i++ {
|
|
mtypef := mtype.Field(i)
|
|
an := annotation{tag: d.tagName}
|
|
opts := tomlOptions(mtypef, an)
|
|
if !opts.include {
|
|
continue
|
|
}
|
|
baseKey := opts.name
|
|
keysToTry := []string{
|
|
baseKey,
|
|
strings.ToLower(baseKey),
|
|
strings.ToTitle(baseKey),
|
|
strings.ToLower(string(baseKey[0])) + baseKey[1:],
|
|
}
|
|
|
|
found := false
|
|
if tval != nil {
|
|
for _, key := range keysToTry {
|
|
exists := tval.HasPath([]string{key})
|
|
if !exists {
|
|
continue
|
|
}
|
|
|
|
d.visitor.push(key)
|
|
val := tval.GetPath([]string{key})
|
|
fval := mval.Field(i)
|
|
mvalf, err := d.valueFromToml(mtypef.Type, val, &fval)
|
|
if err != nil {
|
|
return mval, formatError(err, tval.GetPositionPath([]string{key}))
|
|
}
|
|
mval.Field(i).Set(mvalf)
|
|
found = true
|
|
d.visitor.pop()
|
|
break
|
|
}
|
|
}
|
|
|
|
if !found && opts.defaultValue != "" {
|
|
mvalf := mval.Field(i)
|
|
var val interface{}
|
|
var err error
|
|
switch mvalf.Kind() {
|
|
case reflect.String:
|
|
val = opts.defaultValue
|
|
case reflect.Bool:
|
|
val, err = strconv.ParseBool(opts.defaultValue)
|
|
case reflect.Uint:
|
|
val, err = strconv.ParseUint(opts.defaultValue, 10, 0)
|
|
case reflect.Uint8:
|
|
val, err = strconv.ParseUint(opts.defaultValue, 10, 8)
|
|
case reflect.Uint16:
|
|
val, err = strconv.ParseUint(opts.defaultValue, 10, 16)
|
|
case reflect.Uint32:
|
|
val, err = strconv.ParseUint(opts.defaultValue, 10, 32)
|
|
case reflect.Uint64:
|
|
val, err = strconv.ParseUint(opts.defaultValue, 10, 64)
|
|
case reflect.Int:
|
|
val, err = strconv.ParseInt(opts.defaultValue, 10, 0)
|
|
case reflect.Int8:
|
|
val, err = strconv.ParseInt(opts.defaultValue, 10, 8)
|
|
case reflect.Int16:
|
|
val, err = strconv.ParseInt(opts.defaultValue, 10, 16)
|
|
case reflect.Int32:
|
|
val, err = strconv.ParseInt(opts.defaultValue, 10, 32)
|
|
case reflect.Int64:
|
|
val, err = strconv.ParseInt(opts.defaultValue, 10, 64)
|
|
case reflect.Float32:
|
|
val, err = strconv.ParseFloat(opts.defaultValue, 32)
|
|
case reflect.Float64:
|
|
val, err = strconv.ParseFloat(opts.defaultValue, 64)
|
|
default:
|
|
return mvalf, fmt.Errorf("unsupported field type for default option")
|
|
}
|
|
|
|
if err != nil {
|
|
return mvalf, err
|
|
}
|
|
mvalf.Set(reflect.ValueOf(val).Convert(mvalf.Type()))
|
|
}
|
|
|
|
// save the old behavior above and try to check structs
|
|
if !found && opts.defaultValue == "" && mtypef.Type.Kind() == reflect.Struct {
|
|
tmpTval := tval
|
|
if !mtypef.Anonymous {
|
|
tmpTval = nil
|
|
}
|
|
fval := mval.Field(i)
|
|
v, err := d.valueFromTree(mtypef.Type, tmpTval, &fval)
|
|
if err != nil {
|
|
return v, err
|
|
}
|
|
mval.Field(i).Set(v)
|
|
}
|
|
}
|
|
}
|
|
case reflect.Map:
|
|
mval = reflect.MakeMap(mtype)
|
|
for _, key := range tval.Keys() {
|
|
d.visitor.push(key)
|
|
// TODO: path splits key
|
|
val := tval.GetPath([]string{key})
|
|
mvalf, err := d.valueFromToml(mtype.Elem(), val, nil)
|
|
if err != nil {
|
|
return mval, formatError(err, tval.GetPositionPath([]string{key}))
|
|
}
|
|
mval.SetMapIndex(reflect.ValueOf(key).Convert(mtype.Key()), mvalf)
|
|
d.visitor.pop()
|
|
}
|
|
}
|
|
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, err := makeSliceOrArray(mtype, len(tval))
|
|
if err != nil {
|
|
return mval, err
|
|
}
|
|
|
|
for i := 0; i < len(tval); i++ {
|
|
d.visitor.push(strconv.Itoa(i))
|
|
val, err := d.valueFromTree(mtype.Elem(), tval[i], nil)
|
|
if err != nil {
|
|
return mval, err
|
|
}
|
|
mval.Index(i).Set(val)
|
|
d.visitor.pop()
|
|
}
|
|
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, err := makeSliceOrArray(mtype, len(tval))
|
|
if err != nil {
|
|
return mval, err
|
|
}
|
|
|
|
for i := 0; i < len(tval); i++ {
|
|
val, err := d.valueFromToml(mtype.Elem(), tval[i], nil)
|
|
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) valueFromOtherSliceI(mtype reflect.Type, tval interface{}) (reflect.Value, error) {
|
|
val := reflect.ValueOf(tval)
|
|
length := val.Len()
|
|
|
|
mval, err := makeSliceOrArray(mtype, length)
|
|
if err != nil {
|
|
return mval, err
|
|
}
|
|
|
|
for i := 0; i < length; i++ {
|
|
val, err := d.valueFromToml(mtype.Elem(), val.Index(i).Interface(), nil)
|
|
if err != nil {
|
|
return mval, err
|
|
}
|
|
mval.Index(i).Set(val)
|
|
}
|
|
return mval, nil
|
|
}
|
|
|
|
// Create a new slice or a new array with specified length
|
|
func makeSliceOrArray(mtype reflect.Type, tLength int) (reflect.Value, error) {
|
|
var mval reflect.Value
|
|
switch mtype.Kind() {
|
|
case reflect.Slice:
|
|
mval = reflect.MakeSlice(mtype, tLength, tLength)
|
|
case reflect.Array:
|
|
mval = reflect.New(reflect.ArrayOf(mtype.Len(), mtype.Elem())).Elem()
|
|
if tLength > mtype.Len() {
|
|
return mval, fmt.Errorf("unmarshal: TOML array length (%v) exceeds destination array length (%v)", tLength, mtype.Len())
|
|
}
|
|
}
|
|
return mval, nil
|
|
}
|
|
|
|
// Convert toml value to marshal value, using marshal type. When mval1 is non-nil
|
|
// and the given type is a struct value, merge fields into it.
|
|
func (d *Decoder) valueFromToml(mtype reflect.Type, tval interface{}, mval1 *reflect.Value) (reflect.Value, error) {
|
|
if mtype.Kind() == reflect.Ptr {
|
|
return d.unwrapPointer(mtype, tval, mval1)
|
|
}
|
|
|
|
switch t := tval.(type) {
|
|
case *Tree:
|
|
var mval11 *reflect.Value
|
|
if mtype.Kind() == reflect.Struct {
|
|
mval11 = mval1
|
|
}
|
|
|
|
if isTree(mtype) {
|
|
return d.valueFromTree(mtype, t, mval11)
|
|
}
|
|
|
|
if mtype.Kind() == reflect.Interface {
|
|
if mval1 == nil || mval1.IsNil() {
|
|
return d.valueFromTree(reflect.TypeOf(map[string]interface{}{}), t, nil)
|
|
} else {
|
|
return d.valueFromToml(mval1.Elem().Type(), t, nil)
|
|
}
|
|
}
|
|
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a tree", tval, tval)
|
|
case []*Tree:
|
|
if isTreeSequence(mtype) {
|
|
return d.valueFromTreeSlice(mtype, t)
|
|
}
|
|
if mtype.Kind() == reflect.Interface {
|
|
if mval1 == nil || mval1.IsNil() {
|
|
return d.valueFromTreeSlice(reflect.TypeOf([]map[string]interface{}{}), t)
|
|
} else {
|
|
ival := mval1.Elem()
|
|
return d.valueFromToml(mval1.Elem().Type(), t, &ival)
|
|
}
|
|
}
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to trees", tval, tval)
|
|
case []interface{}:
|
|
d.visitor.visit()
|
|
if isOtherSequence(mtype) {
|
|
return d.valueFromOtherSlice(mtype, t)
|
|
}
|
|
if mtype.Kind() == reflect.Interface {
|
|
if mval1 == nil || mval1.IsNil() {
|
|
return d.valueFromOtherSlice(reflect.TypeOf([]interface{}{}), t)
|
|
} else {
|
|
ival := mval1.Elem()
|
|
return d.valueFromToml(mval1.Elem().Type(), t, &ival)
|
|
}
|
|
}
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a slice", tval, tval)
|
|
default:
|
|
d.visitor.visit()
|
|
// Check if pointer to value implements the encoding.TextUnmarshaler.
|
|
if mvalPtr := reflect.New(mtype); isTextUnmarshaler(mvalPtr.Type()) && !isTimeType(mtype) {
|
|
if err := d.unmarshalText(tval, mvalPtr); err != nil {
|
|
return reflect.ValueOf(nil), fmt.Errorf("unmarshal text: %v", err)
|
|
}
|
|
return mvalPtr.Elem(), nil
|
|
}
|
|
|
|
switch mtype.Kind() {
|
|
case reflect.Bool, reflect.Struct:
|
|
val := reflect.ValueOf(tval)
|
|
|
|
switch val.Type() {
|
|
case localDateType:
|
|
localDate := val.Interface().(LocalDate)
|
|
switch mtype {
|
|
case timeType:
|
|
return reflect.ValueOf(time.Date(localDate.Year, localDate.Month, localDate.Day, 0, 0, 0, 0, time.Local)), nil
|
|
}
|
|
case localDateTimeType:
|
|
localDateTime := val.Interface().(LocalDateTime)
|
|
switch mtype {
|
|
case timeType:
|
|
return reflect.ValueOf(time.Date(
|
|
localDateTime.Date.Year,
|
|
localDateTime.Date.Month,
|
|
localDateTime.Date.Day,
|
|
localDateTime.Time.Hour,
|
|
localDateTime.Time.Minute,
|
|
localDateTime.Time.Second,
|
|
localDateTime.Time.Nanosecond,
|
|
time.Local)), nil
|
|
}
|
|
}
|
|
|
|
// if this passes for when mtype is reflect.Struct, tval is a time.LocalTime
|
|
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 mtype.Kind() == reflect.Int64 && mtype == reflect.TypeOf(time.Duration(1)) && val.Kind() == reflect.String {
|
|
d, err := time.ParseDuration(val.String())
|
|
if err != nil {
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v. %s", tval, tval, mtype.String(), err)
|
|
}
|
|
return reflect.ValueOf(d), nil
|
|
}
|
|
if !val.Type().ConvertibleTo(mtype) || val.Kind() == reflect.Float64 {
|
|
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.Convert(reflect.TypeOf(int64(0))).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) || val.Kind() == reflect.Float64 {
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v", tval, tval, mtype.String())
|
|
}
|
|
|
|
if val.Convert(reflect.TypeOf(int(1))).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(val.Convert(reflect.TypeOf(uint64(0))).Uint()) {
|
|
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) || val.Kind() == reflect.Int64 {
|
|
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.Convert(reflect.TypeOf(float64(0))).Float()) {
|
|
return reflect.ValueOf(nil), fmt.Errorf("%v(%T) would overflow %v", tval, tval, mtype.String())
|
|
}
|
|
|
|
return val.Convert(mtype), nil
|
|
case reflect.Interface:
|
|
if mval1 == nil || mval1.IsNil() {
|
|
return reflect.ValueOf(tval), nil
|
|
} else {
|
|
ival := mval1.Elem()
|
|
return d.valueFromToml(mval1.Elem().Type(), t, &ival)
|
|
}
|
|
case reflect.Slice, reflect.Array:
|
|
if isOtherSequence(mtype) && isOtherSequence(reflect.TypeOf(t)) {
|
|
return d.valueFromOtherSliceI(mtype, t)
|
|
}
|
|
return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v(%v)", tval, tval, mtype, mtype.Kind())
|
|
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{}, mval1 *reflect.Value) (reflect.Value, error) {
|
|
var melem *reflect.Value
|
|
|
|
if mval1 != nil && !mval1.IsNil() && (mtype.Elem().Kind() == reflect.Struct || mtype.Elem().Kind() == reflect.Interface) {
|
|
elem := mval1.Elem()
|
|
melem = &elem
|
|
}
|
|
|
|
val, err := d.valueFromToml(mtype.Elem(), tval, melem)
|
|
if err != nil {
|
|
return reflect.ValueOf(nil), err
|
|
}
|
|
mval := reflect.New(mtype.Elem())
|
|
mval.Elem().Set(val)
|
|
return mval, nil
|
|
}
|
|
|
|
func (d *Decoder) unmarshalText(tval interface{}, mval reflect.Value) error {
|
|
var buf bytes.Buffer
|
|
fmt.Fprint(&buf, tval)
|
|
return callTextUnmarshaler(mval, buf.Bytes())
|
|
}
|
|
|
|
func tomlOptions(vf reflect.StructField, an annotation) tomlOpts {
|
|
tag := vf.Tag.Get(an.tag)
|
|
parse := strings.Split(tag, ",")
|
|
var comment string
|
|
if c := vf.Tag.Get(an.comment); c != "" {
|
|
comment = c
|
|
}
|
|
commented, _ := strconv.ParseBool(vf.Tag.Get(an.commented))
|
|
multiline, _ := strconv.ParseBool(vf.Tag.Get(an.multiline))
|
|
defaultValue := vf.Tag.Get(tagDefault)
|
|
result := tomlOpts{
|
|
name: vf.Name,
|
|
nameFromTag: false,
|
|
comment: comment,
|
|
commented: commented,
|
|
multiline: multiline,
|
|
include: true,
|
|
omitempty: false,
|
|
defaultValue: defaultValue,
|
|
}
|
|
if parse[0] != "" {
|
|
if parse[0] == "-" && len(parse) == 1 {
|
|
result.include = false
|
|
} else {
|
|
result.name = strings.Trim(parse[0], " ")
|
|
result.nameFromTag = true
|
|
}
|
|
}
|
|
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.Slice, reflect.Array, reflect.Map:
|
|
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)
|
|
}
|
|
|
|
// visitorState keeps track of which keys were unmarshaled.
|
|
type visitorState struct {
|
|
tree *Tree
|
|
path []string
|
|
keys map[string]struct{}
|
|
active bool
|
|
}
|
|
|
|
func newVisitorState(tree *Tree) visitorState {
|
|
path, result := []string{}, map[string]struct{}{}
|
|
insertKeys(path, result, tree)
|
|
return visitorState{
|
|
tree: tree,
|
|
path: path[:0],
|
|
keys: result,
|
|
active: true,
|
|
}
|
|
}
|
|
|
|
func (s *visitorState) push(key string) {
|
|
if s.active {
|
|
s.path = append(s.path, key)
|
|
}
|
|
}
|
|
|
|
func (s *visitorState) pop() {
|
|
if s.active {
|
|
s.path = s.path[:len(s.path)-1]
|
|
}
|
|
}
|
|
|
|
func (s *visitorState) visit() {
|
|
if s.active {
|
|
delete(s.keys, strings.Join(s.path, "."))
|
|
}
|
|
}
|
|
|
|
func (s *visitorState) visitAll() {
|
|
if s.active {
|
|
for k := range s.keys {
|
|
if strings.HasPrefix(k, strings.Join(s.path, ".")) {
|
|
delete(s.keys, k)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *visitorState) validate() error {
|
|
if !s.active {
|
|
return nil
|
|
}
|
|
undecoded := make([]string, 0, len(s.keys))
|
|
for key := range s.keys {
|
|
undecoded = append(undecoded, key)
|
|
}
|
|
sort.Strings(undecoded)
|
|
if len(undecoded) > 0 {
|
|
return fmt.Errorf("undecoded keys: %q", undecoded)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func insertKeys(path []string, m map[string]struct{}, tree *Tree) {
|
|
for k, v := range tree.values {
|
|
switch node := v.(type) {
|
|
case []*Tree:
|
|
for i, item := range node {
|
|
insertKeys(append(path, k, strconv.Itoa(i)), m, item)
|
|
}
|
|
case *Tree:
|
|
insertKeys(append(path, k), m, node)
|
|
case *tomlValue:
|
|
m[strings.Join(append(path, k), ".")] = struct{}{}
|
|
}
|
|
}
|
|
}
|