/usr/share/gocode/src/github.com/influxdata/toml/decode.go is in golang-github-influxdata-toml-dev 0.0~git20160905.0.ad49a5c-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"fmt"
"io"
"io/ioutil"
"log"
"reflect"
"strconv"
"strings"
"sync"
"github.com/influxdata/toml/ast"
)
const (
tableSeparator = '.'
)
var (
escapeReplacer = strings.NewReplacer(
"\b", "\\n",
"\f", "\\f",
"\n", "\\n",
"\r", "\\r",
"\t", "\\t",
)
underscoreReplacer = strings.NewReplacer(
"_", "",
)
loggerMu sync.RWMutex
logger *log.Logger
)
// Set a logger for the parsing operation, to log extraneous configuration options.
func SetLogger(l *log.Logger) {
loggerMu.Lock()
defer loggerMu.Unlock()
logger = l
}
func getLogger() *log.Logger {
loggerMu.RLock()
defer loggerMu.RUnlock()
return logger
}
// Unmarshal parses the TOML data and stores the result in the value pointed to by v.
//
// Unmarshal will mapped to v that according to following rules:
//
// TOML strings to string
// TOML integers to any int type
// TOML floats to float32 or float64
// TOML booleans to bool
// TOML datetimes to time.Time
// TOML arrays to any type of slice or []interface{}
// TOML tables to struct
// TOML array of tables to slice of struct
func Unmarshal(data []byte, v interface{}) error {
table, err := Parse(data)
if err != nil {
return err
}
if err := UnmarshalTable(table, v); err != nil {
return fmt.Errorf("toml: unmarshal: %v", err)
}
return nil
}
// A Decoder reads and decodes TOML from an input stream.
type Decoder struct {
r io.Reader
}
// NewDecoder returns a new Decoder that reads from r.
// Note that it reads all from r before parsing it.
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{
r: r,
}
}
// Decode parses the TOML data from its input and stores it in the value pointed to by v.
// See the documentation for Unmarshal for details about the conversion of TOML into a Go value.
func (d *Decoder) Decode(v interface{}) error {
b, err := ioutil.ReadAll(d.r)
if err != nil {
return err
}
return Unmarshal(b, v)
}
// Unmarshaler is the interface implemented by objects that can unmarshal a
// TOML description of themselves.
// The input can be assumed to be a valid encoding of a TOML value.
// UnmarshalJSON must copy the TOML data if it wishes to retain the data after
// returning.
type Unmarshaler interface {
UnmarshalTOML([]byte) error
}
// UnmarshalTable applies the contents of an ast.Table to the value pointed at by v.
//
// UnmarshalTable will mapped to v that according to following rules:
//
// TOML strings to string
// TOML integers to any int type
// TOML floats to float32 or float64
// TOML booleans to bool
// TOML datetimes to time.Time
// TOML arrays to any type of slice or []interface{}
// TOML tables to struct
// TOML array of tables to slice of struct
func UnmarshalTable(t *ast.Table, v interface{}) (err error) {
if v == nil {
return fmt.Errorf("v must not be nil")
}
rv := reflect.ValueOf(v)
if kind := rv.Kind(); kind != reflect.Ptr && kind != reflect.Map {
return fmt.Errorf("v must be a pointer or map")
}
for rv.Kind() == reflect.Ptr {
rv = rv.Elem()
}
if err, ok := setUnmarshaler(rv, string(t.Data)); ok {
return err
}
for key, val := range t.Fields {
switch av := val.(type) {
case *ast.KeyValue:
fv, fieldName, found := findField(rv, key)
if !found {
if l := getLogger(); l != nil {
l.Printf("line %d: field corresponding to `%s' is not defined in `%T'", av.Line, key, v)
}
continue
}
switch fv.Kind() {
case reflect.Map:
mv := reflect.New(fv.Type().Elem()).Elem()
if err := UnmarshalTable(t, mv.Addr().Interface()); err != nil {
return err
}
fv.SetMapIndex(reflect.ValueOf(fieldName), mv)
default:
if err := setValue(fv, av.Value); err != nil {
return fmt.Errorf("line %d: %v.%s: %v", av.Line, rv.Type(), fieldName, err)
}
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
}
case *ast.Table:
fv, fieldName, found := findField(rv, key)
if !found {
if l := getLogger(); l != nil {
l.Printf("line %d: field corresponding to `%s' is not defined in `%T'", av.Line, key, v)
}
continue
}
if err, ok := setUnmarshaler(fv, string(av.Data)); ok {
if err != nil {
return err
}
continue
}
for fv.Kind() == reflect.Ptr {
fv.Set(reflect.New(fv.Type().Elem()))
fv = fv.Elem()
}
switch fv.Kind() {
case reflect.Struct:
vv := reflect.New(fv.Type()).Elem()
if err := UnmarshalTable(av, vv.Addr().Interface()); err != nil {
return err
}
fv.Set(vv)
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
case reflect.Map:
mv := reflect.MakeMap(fv.Type())
if err := UnmarshalTable(av, mv.Interface()); err != nil {
return err
}
fv.Set(mv)
default:
return fmt.Errorf("line %d: `%v.%s' must be struct or map, but %v given", av.Line, rv.Type(), fieldName, fv.Kind())
}
case []*ast.Table:
fv, fieldName, found := findField(rv, key)
if !found {
if l := getLogger(); l != nil {
l.Printf("line %d: field corresponding to `%s' is not defined in `%T'", av[0].Line, key, v)
}
continue
}
data := make([]string, 0, len(av))
for _, tbl := range av {
data = append(data, string(tbl.Data))
}
if err, ok := setUnmarshaler(fv, strings.Join(data, "\n")); ok {
if err != nil {
return err
}
continue
}
t := fv.Type().Elem()
pc := 0
for ; t.Kind() == reflect.Ptr; pc++ {
t = t.Elem()
}
if fv.Kind() != reflect.Slice {
return fmt.Errorf("line %d: `%v.%s' must be slice type, but %v given", av[0].Line, rv.Type(), fieldName, fv.Kind())
}
for _, tbl := range av {
var vv reflect.Value
switch t.Kind() {
case reflect.Map:
vv = reflect.MakeMap(t)
if err := UnmarshalTable(tbl, vv.Interface()); err != nil {
return err
}
default:
vv = reflect.New(t).Elem()
if err := UnmarshalTable(tbl, vv.Addr().Interface()); err != nil {
return err
}
}
for i := 0; i < pc; i++ {
vv = vv.Addr()
pv := reflect.New(vv.Type()).Elem()
pv.Set(vv)
vv = pv
}
fv.Set(reflect.Append(fv, vv))
}
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
default:
return fmt.Errorf("BUG: unknown type `%T'", t)
}
}
return nil
}
func setUnmarshaler(lhs reflect.Value, data string) (error, bool) {
for lhs.Kind() == reflect.Ptr {
lhs.Set(reflect.New(lhs.Type().Elem()))
lhs = lhs.Elem()
}
if lhs.CanAddr() {
if u, ok := lhs.Addr().Interface().(Unmarshaler); ok {
return u.UnmarshalTOML([]byte(data)), true
}
}
return nil, false
}
func setValue(lhs reflect.Value, val ast.Value) error {
for lhs.Kind() == reflect.Ptr {
lhs.Set(reflect.New(lhs.Type().Elem()))
lhs = lhs.Elem()
}
if err, ok := setUnmarshaler(lhs, val.Source()); ok {
return err
}
switch v := val.(type) {
case *ast.Integer:
if err := setInt(lhs, v); err != nil {
return err
}
case *ast.Float:
if err := setFloat(lhs, v); err != nil {
return err
}
case *ast.String:
if err := setString(lhs, v); err != nil {
return err
}
case *ast.Boolean:
if err := setBoolean(lhs, v); err != nil {
return err
}
case *ast.Datetime:
if err := setDatetime(lhs, v); err != nil {
return err
}
case *ast.Array:
if err := setArray(lhs, v); err != nil {
return err
}
}
return nil
}
func setInt(fv reflect.Value, v *ast.Integer) error {
i, err := v.Int()
if err != nil {
return err
}
switch fv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if fv.OverflowInt(i) {
return &errorOutOfRange{fv.Kind(), i}
}
fv.SetInt(i)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
fv.SetUint(uint64(i))
case reflect.Interface:
fv.Set(reflect.ValueOf(i))
default:
return fmt.Errorf("`%v' is not any types of int", fv.Type())
}
return nil
}
func setFloat(fv reflect.Value, v *ast.Float) error {
f, err := v.Float()
if err != nil {
return err
}
switch fv.Kind() {
case reflect.Float32, reflect.Float64:
if fv.OverflowFloat(f) {
return &errorOutOfRange{fv.Kind(), f}
}
fv.SetFloat(f)
case reflect.Interface:
fv.Set(reflect.ValueOf(f))
default:
return fmt.Errorf("`%v' is not float32 or float64", fv.Type())
}
return nil
}
func setString(fv reflect.Value, v *ast.String) error {
return set(fv, v.Value)
}
func setBoolean(fv reflect.Value, v *ast.Boolean) error {
b, err := v.Boolean()
if err != nil {
return err
}
return set(fv, b)
}
func setDatetime(fv reflect.Value, v *ast.Datetime) error {
tm, err := v.Time()
if err != nil {
return err
}
return set(fv, tm)
}
func setArray(fv reflect.Value, v *ast.Array) error {
if len(v.Value) == 0 {
return nil
}
typ := reflect.TypeOf(v.Value[0])
for _, vv := range v.Value[1:] {
if typ != reflect.TypeOf(vv) {
return fmt.Errorf("array cannot contain multiple types")
}
}
sliceType := fv.Type()
if fv.Kind() == reflect.Interface {
sliceType = reflect.SliceOf(sliceType)
}
slice := reflect.MakeSlice(sliceType, 0, len(v.Value))
t := sliceType.Elem()
for _, vv := range v.Value {
tmp := reflect.New(t).Elem()
if err := setValue(tmp, vv); err != nil {
return err
}
slice = reflect.Append(slice, tmp)
}
fv.Set(slice)
return nil
}
func set(fv reflect.Value, v interface{}) error {
rhs := reflect.ValueOf(v)
if !rhs.Type().AssignableTo(fv.Type()) {
return fmt.Errorf("`%v' type is not assignable to `%v' type", rhs.Type(), fv.Type())
}
fv.Set(rhs)
return nil
}
type stack struct {
key string
table *ast.Table
}
type toml struct {
table *ast.Table
line int
currentTable *ast.Table
s string
key string
val ast.Value
arr *array
tableMap map[string]*ast.Table
stack []*stack
skip bool
}
func (p *toml) init(data []rune) {
p.line = 1
p.table = &ast.Table{
Line: p.line,
Type: ast.TableTypeNormal,
Data: data[:len(data)-1], // truncate the end_symbol added by PEG parse generator.
}
p.tableMap = map[string]*ast.Table{
"": p.table,
}
p.currentTable = p.table
}
func (p *toml) Error(err error) {
panic(convertError{fmt.Errorf("toml: line %d: %v", p.line, err)})
}
func (p *tomlParser) SetTime(begin, end int) {
p.val = &ast.Datetime{
Position: ast.Position{Begin: begin, End: end},
Data: p.buffer[begin:end],
Value: string(p.buffer[begin:end]),
}
}
func (p *tomlParser) SetFloat64(begin, end int) {
p.val = &ast.Float{
Position: ast.Position{Begin: begin, End: end},
Data: p.buffer[begin:end],
Value: underscoreReplacer.Replace(string(p.buffer[begin:end])),
}
}
func (p *tomlParser) SetInt64(begin, end int) {
p.val = &ast.Integer{
Position: ast.Position{Begin: begin, End: end},
Data: p.buffer[begin:end],
Value: underscoreReplacer.Replace(string(p.buffer[begin:end])),
}
}
func (p *tomlParser) SetString(begin, end int) {
p.val = &ast.String{
Position: ast.Position{Begin: begin, End: end},
Data: p.buffer[begin:end],
Value: p.s,
}
p.s = ""
}
func (p *tomlParser) SetBool(begin, end int) {
p.val = &ast.Boolean{
Position: ast.Position{Begin: begin, End: end},
Data: p.buffer[begin:end],
Value: string(p.buffer[begin:end]),
}
}
func (p *tomlParser) StartArray() {
if p.arr == nil {
p.arr = &array{line: p.line, current: &ast.Array{}}
return
}
p.arr.child = &array{parent: p.arr, line: p.line, current: &ast.Array{}}
p.arr = p.arr.child
}
func (p *tomlParser) AddArrayVal() {
if p.arr.current == nil {
p.arr.current = &ast.Array{}
}
p.arr.current.Value = append(p.arr.current.Value, p.val)
}
func (p *tomlParser) SetArray(begin, end int) {
p.arr.current.Position = ast.Position{Begin: begin, End: end}
p.arr.current.Data = p.buffer[begin:end]
p.val = p.arr.current
p.arr = p.arr.parent
}
func (p *toml) SetTable(buf []rune, begin, end int) {
p.setTable(p.table, buf, begin, end)
}
func (p *toml) setTable(t *ast.Table, buf []rune, begin, end int) {
name := string(buf[begin:end])
names := splitTableKey(name)
if t, exists := p.tableMap[name]; exists {
if lt := p.tableMap[names[len(names)-1]]; t.Type == ast.TableTypeArray || lt != nil && lt.Type == ast.TableTypeNormal {
p.Error(fmt.Errorf("table `%s' is in conflict with %v table in line %d", name, t.Type, t.Line))
}
}
t, err := p.lookupTable(t, names)
if err != nil {
p.Error(err)
}
p.currentTable = t
p.tableMap[name] = p.currentTable
}
func (p *tomlParser) SetTableString(begin, end int) {
p.currentTable.Data = p.buffer[begin:end]
p.currentTable.Position.Begin = begin
p.currentTable.Position.End = end
}
func (p *toml) SetArrayTable(buf []rune, begin, end int) {
p.setArrayTable(p.table, buf, begin, end)
}
func (p *toml) setArrayTable(t *ast.Table, buf []rune, begin, end int) {
name := string(buf[begin:end])
if t, exists := p.tableMap[name]; exists && t.Type == ast.TableTypeNormal {
p.Error(fmt.Errorf("table `%s' is in conflict with %v table in line %d", name, t.Type, t.Line))
}
names := splitTableKey(name)
t, err := p.lookupTable(t, names[:len(names)-1])
if err != nil {
p.Error(err)
}
last := names[len(names)-1]
tbl := &ast.Table{
Position: ast.Position{Begin: begin, End: end},
Line: p.line,
Name: last,
Type: ast.TableTypeArray,
}
switch v := t.Fields[last].(type) {
case nil:
if t.Fields == nil {
t.Fields = make(map[string]interface{})
}
t.Fields[last] = []*ast.Table{tbl}
case []*ast.Table:
t.Fields[last] = append(v, tbl)
case *ast.KeyValue:
p.Error(fmt.Errorf("key `%s' is in conflict with line %d", last, v.Line))
default:
p.Error(fmt.Errorf("BUG: key `%s' is in conflict but it's unknown type `%T'", last, v))
}
p.currentTable = tbl
p.tableMap[name] = p.currentTable
}
func (p *toml) StartInlineTable() {
p.skip = false
p.stack = append(p.stack, &stack{p.key, p.currentTable})
buf := []rune(p.key)
if p.arr == nil {
p.setTable(p.currentTable, buf, 0, len(buf))
} else {
p.setArrayTable(p.currentTable, buf, 0, len(buf))
}
}
func (p *toml) EndInlineTable() {
st := p.stack[len(p.stack)-1]
p.key, p.currentTable = st.key, st.table
p.stack[len(p.stack)-1] = nil
p.stack = p.stack[:len(p.stack)-1]
p.skip = true
}
func (p *toml) AddLineCount(i int) {
p.line += i
}
func (p *toml) SetKey(buf []rune, begin, end int) {
p.key = string(buf[begin:end])
}
func (p *toml) AddKeyValue() {
if p.skip {
p.skip = false
return
}
if val, exists := p.currentTable.Fields[p.key]; exists {
switch v := val.(type) {
case *ast.Table:
p.Error(fmt.Errorf("key `%s' is in conflict with %v table in line %d", p.key, v.Type, v.Line))
case *ast.KeyValue:
p.Error(fmt.Errorf("key `%s' is in conflict with line %d", p.key, v.Line))
default:
p.Error(fmt.Errorf("BUG: key `%s' is in conflict but it's unknown type `%T'", p.key, v))
}
}
if p.currentTable.Fields == nil {
p.currentTable.Fields = make(map[string]interface{})
}
p.currentTable.Fields[p.key] = &ast.KeyValue{
Key: p.key,
Value: p.val,
Line: p.line,
}
}
func (p *toml) SetBasicString(buf []rune, begin, end int) {
p.s = p.unquote(string(buf[begin:end]))
}
func (p *toml) SetMultilineString() {
p.s = p.unquote(`"` + escapeReplacer.Replace(strings.TrimLeft(p.s, "\r\n")) + `"`)
}
func (p *toml) AddMultilineBasicBody(buf []rune, begin, end int) {
p.s += string(buf[begin:end])
}
func (p *toml) SetLiteralString(buf []rune, begin, end int) {
p.s = string(buf[begin:end])
}
func (p *toml) SetMultilineLiteralString(buf []rune, begin, end int) {
p.s = strings.TrimLeft(string(buf[begin:end]), "\r\n")
}
func (p *toml) unquote(s string) string {
s, err := strconv.Unquote(s)
if err != nil {
p.Error(err)
}
return s
}
func (p *toml) lookupTable(t *ast.Table, keys []string) (*ast.Table, error) {
for _, s := range keys {
val, exists := t.Fields[s]
if !exists {
tbl := &ast.Table{
Line: p.line,
Name: s,
Type: ast.TableTypeNormal,
}
if t.Fields == nil {
t.Fields = make(map[string]interface{})
}
t.Fields[s] = tbl
t = tbl
continue
}
switch v := val.(type) {
case *ast.Table:
t = v
case []*ast.Table:
t = v[len(v)-1]
case *ast.KeyValue:
return nil, fmt.Errorf("key `%s' is in conflict with line %d", s, v.Line)
default:
return nil, fmt.Errorf("BUG: key `%s' is in conflict but it's unknown type `%T'", s, v)
}
}
return t, nil
}
func splitTableKey(tk string) []string {
key := make([]byte, 0, 1)
keys := make([]string, 0, 1)
inQuote := false
for i := 0; i < len(tk); i++ {
k := tk[i]
switch {
case k == tableSeparator && !inQuote:
keys = append(keys, string(key))
key = key[:0] // reuse buffer.
case k == '"':
inQuote = !inQuote
case (k == ' ' || k == '\t') && !inQuote:
// skip.
default:
key = append(key, k)
}
}
keys = append(keys, string(key))
return keys
}
type convertError struct {
err error
}
func (e convertError) Error() string {
return e.err.Error()
}
type array struct {
parent *array
child *array
current *ast.Array
line int
}
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