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Copy pathini.go
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1054 lines (927 loc) · 24.5 KB
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// Copyright 2014 Unknwon
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// Package ini provides INI file read and write functionality in Go.
package ini
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"regexp"
"runtime"
"strconv"
"strings"
"sync"
"time"
)
const (
DEFAULT_SECTION = "DEFAULT"
// Maximum allowed depth when recursively substituing variable names.
_DEPTH_VALUES = 99
_VERSION = "1.3.0"
)
func Version() string {
return _VERSION
}
var (
LineBreak = "\n"
// Variable regexp pattern: %(variable)s
varPattern = regexp.MustCompile(`%\(([^\)]+)\)s`)
// Write spaces around "=" to look better.
PrettyFormat = true
)
func init() {
if runtime.GOOS == "windows" {
LineBreak = "\r\n"
}
}
func inSlice(str string, s []string) bool {
for _, v := range s {
if str == v {
return true
}
}
return false
}
// dataSource is a interface that returns file content.
type dataSource interface {
Reader() (io.Reader, error)
}
type sourceFile struct {
name string
}
func (s sourceFile) Reader() (io.Reader, error) {
return os.Open(s.name)
}
type sourceData struct {
data []byte
}
func (s *sourceData) Reader() (io.Reader, error) {
return bytes.NewReader(s.data), nil
}
// ____ __.
// | |/ _|____ ___.__.
// | <_/ __ < | |
// | | \ ___/\___ |
// |____|__ \___ > ____|
// \/ \/\/
// Key represents a key under a section.
type Key struct {
s *Section
Comment string
name string
value string
isAutoIncr bool
}
// Name returns name of key.
func (k *Key) Name() string {
return k.name
}
// Value returns raw value of key for performance purpose.
func (k *Key) Value() string {
return k.value
}
// String returns string representation of value.
func (k *Key) String() string {
val := k.value
if strings.Index(val, "%") == -1 {
return val
}
for i := 0; i < _DEPTH_VALUES; i++ {
vr := varPattern.FindString(val)
if len(vr) == 0 {
break
}
// Take off leading '%(' and trailing ')s'.
noption := strings.TrimLeft(vr, "%(")
noption = strings.TrimRight(noption, ")s")
// Search in the same section.
nk, err := k.s.GetKey(noption)
if err != nil {
// Search again in default section.
nk, _ = k.s.f.Section("").GetKey(noption)
}
// Substitute by new value and take off leading '%(' and trailing ')s'.
val = strings.Replace(val, vr, nk.value, -1)
}
return val
}
// parseBool returns the boolean value represented by the string.
//
// It accepts 1, t, T, TRUE, true, True, YES, yes, Yes, ON, on, On,
// 0, f, F, FALSE, false, False, NO, no, No, OFF, off, Off.
// Any other value returns an error.
func parseBool(str string) (value bool, err error) {
switch str {
case "1", "t", "T", "true", "TRUE", "True", "YES", "yes", "Yes", "ON", "on", "On":
return true, nil
case "0", "f", "F", "false", "FALSE", "False", "NO", "no", "No", "OFF", "off", "Off":
return false, nil
}
return false, fmt.Errorf("parsing \"%s\": invalid syntax", str)
}
// Bool returns bool type value.
func (k *Key) Bool() (bool, error) {
return parseBool(k.String())
}
// Float64 returns float64 type value.
func (k *Key) Float64() (float64, error) {
return strconv.ParseFloat(k.String(), 64)
}
// Int returns int type value.
func (k *Key) Int() (int, error) {
return strconv.Atoi(k.String())
}
// Int64 returns int64 type value.
func (k *Key) Int64() (int64, error) {
return strconv.ParseInt(k.String(), 10, 64)
}
// TimeFormat parses with given format and returns time.Time type value.
func (k *Key) TimeFormat(format string) (time.Time, error) {
return time.Parse(format, k.String())
}
// Time parses with RFC3339 format and returns time.Time type value.
func (k *Key) Time() (time.Time, error) {
return k.TimeFormat(time.RFC3339)
}
// MustString returns default value if key value is empty.
func (k *Key) MustString(defaultVal string) string {
val := k.String()
if len(val) == 0 {
return defaultVal
}
return val
}
// MustBool always returns value without error,
// it returns false if error occurs.
func (k *Key) MustBool(defaultVal ...bool) bool {
val, err := k.Bool()
if len(defaultVal) > 0 && err != nil {
return defaultVal[0]
}
return val
}
// MustFloat64 always returns value without error,
// it returns 0.0 if error occurs.
func (k *Key) MustFloat64(defaultVal ...float64) float64 {
val, err := k.Float64()
if len(defaultVal) > 0 && err != nil {
return defaultVal[0]
}
return val
}
// MustInt always returns value without error,
// it returns 0 if error occurs.
func (k *Key) MustInt(defaultVal ...int) int {
val, err := k.Int()
if len(defaultVal) > 0 && err != nil {
return defaultVal[0]
}
return val
}
// MustInt64 always returns value without error,
// it returns 0 if error occurs.
func (k *Key) MustInt64(defaultVal ...int64) int64 {
val, err := k.Int64()
if len(defaultVal) > 0 && err != nil {
return defaultVal[0]
}
return val
}
// MustTimeFormat always parses with given format and returns value without error,
// it returns zero value if error occurs.
func (k *Key) MustTimeFormat(format string, defaultVal ...time.Time) time.Time {
val, err := k.TimeFormat(format)
if len(defaultVal) > 0 && err != nil {
return defaultVal[0]
}
return val
}
// MustTime always parses with RFC3339 format and returns value without error,
// it returns zero value if error occurs.
func (k *Key) MustTime(defaultVal ...time.Time) time.Time {
return k.MustTimeFormat(time.RFC3339, defaultVal...)
}
// In always returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) In(defaultVal string, candidates []string) string {
val := k.String()
for _, cand := range candidates {
if val == cand {
return val
}
}
return defaultVal
}
// InFloat64 always returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) InFloat64(defaultVal float64, candidates []float64) float64 {
val := k.MustFloat64()
for _, cand := range candidates {
if val == cand {
return val
}
}
return defaultVal
}
// InInt always returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) InInt(defaultVal int, candidates []int) int {
val := k.MustInt()
for _, cand := range candidates {
if val == cand {
return val
}
}
return defaultVal
}
// InInt64 always returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) InInt64(defaultVal int64, candidates []int64) int64 {
val := k.MustInt64()
for _, cand := range candidates {
if val == cand {
return val
}
}
return defaultVal
}
// InTimeFormat always parses with given format and returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) InTimeFormat(format string, defaultVal time.Time, candidates []time.Time) time.Time {
val := k.MustTimeFormat(format)
for _, cand := range candidates {
if val == cand {
return val
}
}
return defaultVal
}
// InTime always parses with RFC3339 format and returns value without error,
// it returns default value if error occurs or doesn't fit into candidates.
func (k *Key) InTime(defaultVal time.Time, candidates []time.Time) time.Time {
return k.InTimeFormat(time.RFC3339, defaultVal, candidates)
}
// RangeFloat64 checks if value is in given range inclusively,
// and returns default value if it's not.
func (k *Key) RangeFloat64(defaultVal, min, max float64) float64 {
val := k.MustFloat64()
if val < min || val > max {
return defaultVal
}
return val
}
// RangeInt checks if value is in given range inclusively,
// and returns default value if it's not.
func (k *Key) RangeInt(defaultVal, min, max int) int {
val := k.MustInt()
if val < min || val > max {
return defaultVal
}
return val
}
// RangeInt64 checks if value is in given range inclusively,
// and returns default value if it's not.
func (k *Key) RangeInt64(defaultVal, min, max int64) int64 {
val := k.MustInt64()
if val < min || val > max {
return defaultVal
}
return val
}
// RangeTimeFormat checks if value with given format is in given range inclusively,
// and returns default value if it's not.
func (k *Key) RangeTimeFormat(format string, defaultVal, min, max time.Time) time.Time {
val := k.MustTimeFormat(format)
if val.Unix() < min.Unix() || val.Unix() > max.Unix() {
return defaultVal
}
return val
}
// RangeTime checks if value with RFC3339 format is in given range inclusively,
// and returns default value if it's not.
func (k *Key) RangeTime(defaultVal, min, max time.Time) time.Time {
return k.RangeTimeFormat(time.RFC3339, defaultVal, min, max)
}
// Strings returns list of string devide by given delimiter.
func (k *Key) Strings(delim string) []string {
str := k.String()
if len(str) == 0 {
return []string{}
}
vals := strings.Split(str, delim)
for i := range vals {
vals[i] = strings.TrimSpace(vals[i])
}
return vals
}
// Float64s returns list of float64 devide by given delimiter.
func (k *Key) Float64s(delim string) []float64 {
strs := k.Strings(delim)
vals := make([]float64, len(strs))
for i := range strs {
vals[i], _ = strconv.ParseFloat(strs[i], 64)
}
return vals
}
// Ints returns list of int devide by given delimiter.
func (k *Key) Ints(delim string) []int {
strs := k.Strings(delim)
vals := make([]int, len(strs))
for i := range strs {
vals[i], _ = strconv.Atoi(strs[i])
}
return vals
}
// Int64s returns list of int64 devide by given delimiter.
func (k *Key) Int64s(delim string) []int64 {
strs := k.Strings(delim)
vals := make([]int64, len(strs))
for i := range strs {
vals[i], _ = strconv.ParseInt(strs[i], 10, 64)
}
return vals
}
// TimesFormat parses with given format and returns list of time.Time devide by given delimiter.
func (k *Key) TimesFormat(format, delim string) []time.Time {
strs := k.Strings(delim)
vals := make([]time.Time, len(strs))
for i := range strs {
vals[i], _ = time.Parse(format, strs[i])
}
return vals
}
// Times parses with RFC3339 format and returns list of time.Time devide by given delimiter.
func (k *Key) Times(delim string) []time.Time {
return k.TimesFormat(time.RFC3339, delim)
}
// SetValue changes key value.
func (k *Key) SetValue(v string) {
k.value = v
}
// _________ __ .__
// / _____/ ____ _____/ |_|__| ____ ____
// \_____ \_/ __ \_/ ___\ __\ |/ _ \ / \
// / \ ___/\ \___| | | ( <_> ) | \
// /_______ /\___ >\___ >__| |__|\____/|___| /
// \/ \/ \/ \/
// Section represents a config section.
type Section struct {
f *File
Comment string
name string
keys map[string]*Key
keyList []string
keysHash map[string]string
}
func newSection(f *File, name string) *Section {
return &Section{f, "", name, make(map[string]*Key), make([]string, 0, 10), make(map[string]string)}
}
// Name returns name of Section.
func (s *Section) Name() string {
return s.name
}
// NewKey creates a new key to given section.
func (s *Section) NewKey(name, val string) (*Key, error) {
if len(name) == 0 {
return nil, errors.New("error creating new key: empty key name")
}
if s.f.BlockMode {
s.f.lock.Lock()
defer s.f.lock.Unlock()
}
if inSlice(name, s.keyList) {
s.keys[name].value = val
return s.keys[name], nil
}
s.keyList = append(s.keyList, name)
s.keys[name] = &Key{s, "", name, val, false}
s.keysHash[name] = val
return s.keys[name], nil
}
// GetKey returns key in section by given name.
func (s *Section) GetKey(name string) (*Key, error) {
// FIXME: change to section level lock?
if s.f.BlockMode {
s.f.lock.RLock()
defer s.f.lock.RUnlock()
}
key := s.keys[name]
if key == nil {
// Check if it is a child-section.
if i := strings.LastIndex(s.name, "."); i > -1 {
return s.f.Section(s.name[:i]).GetKey(name)
}
return nil, fmt.Errorf("error when getting key of section '%s': key '%s' not exists", s.name, name)
}
return key, nil
}
// Key assumes named Key exists in section and returns a zero-value when not.
func (s *Section) Key(name string) *Key {
key, err := s.GetKey(name)
if err != nil {
// It's OK here because the only possible error is empty key name,
// but if it's empty, this piece of code won't be executed.
key, _ = s.NewKey(name, "")
return key
}
return key
}
// Keys returns list of keys of section.
func (s *Section) Keys() []*Key {
keys := make([]*Key, len(s.keyList))
for i := range s.keyList {
keys[i] = s.Key(s.keyList[i])
}
return keys
}
// KeyStrings returns list of key names of section.
func (s *Section) KeyStrings() []string {
list := make([]string, len(s.keyList))
copy(list, s.keyList)
return list
}
// KeysHash returns keys hash consisting of names and values.
func (s *Section) KeysHash() map[string]string {
if s.f.BlockMode {
s.f.lock.RLock()
defer s.f.lock.RUnlock()
}
hash := map[string]string{}
for key, value := range s.keysHash {
hash[key] = value
}
return hash
}
// DeleteKey deletes a key from section.
func (s *Section) DeleteKey(name string) {
if s.f.BlockMode {
s.f.lock.Lock()
defer s.f.lock.Unlock()
}
for i, k := range s.keyList {
if k == name {
s.keyList = append(s.keyList[:i], s.keyList[i+1:]...)
delete(s.keys, name)
return
}
}
}
// ___________.__.__
// \_ _____/|__| | ____
// | __) | | | _/ __ \
// | \ | | |_\ ___/
// \___ / |__|____/\___ >
// \/ \/
// File represents a combination of a or more INI file(s) in memory.
type File struct {
// Should make things safe, but sometimes doesn't matter.
BlockMode bool
// Make sure data is safe in multiple goroutines.
lock sync.RWMutex
// Allow combination of multiple data sources.
dataSources []dataSource
// Actual data is stored here.
sections map[string]*Section
// To keep data in order.
sectionList []string
NameMapper
}
// newFile initializes File object with given data sources.
func newFile(dataSources []dataSource) *File {
return &File{
BlockMode: true,
dataSources: dataSources,
sections: make(map[string]*Section),
sectionList: make([]string, 0, 10),
}
}
func parseDataSource(source interface{}) (dataSource, error) {
switch s := source.(type) {
case string:
return sourceFile{s}, nil
case []byte:
return &sourceData{s}, nil
default:
return nil, fmt.Errorf("error parsing data source: unknown type '%s'", s)
}
}
// Load loads and parses from INI data sources.
// Arguments can be mixed of file name with string type, or raw data in []byte.
func Load(source interface{}, others ...interface{}) (_ *File, err error) {
sources := make([]dataSource, len(others)+1)
sources[0], err = parseDataSource(source)
if err != nil {
return nil, err
}
for i := range others {
sources[i+1], err = parseDataSource(others[i])
if err != nil {
return nil, err
}
}
f := newFile(sources)
return f, f.Reload()
}
// Empty returns an empty file object.
func Empty() *File {
// Ignore error here, we sure our data is good.
f, _ := Load([]byte(""))
return f
}
// NewSection creates a new section.
func (f *File) NewSection(name string) (*Section, error) {
if len(name) == 0 {
return nil, errors.New("error creating new section: empty section name")
}
if f.BlockMode {
f.lock.Lock()
defer f.lock.Unlock()
}
if inSlice(name, f.sectionList) {
return f.sections[name], nil
}
f.sectionList = append(f.sectionList, name)
f.sections[name] = newSection(f, name)
return f.sections[name], nil
}
// NewSections creates a list of sections.
func (f *File) NewSections(names ...string) (err error) {
for _, name := range names {
if _, err = f.NewSection(name); err != nil {
return err
}
}
return nil
}
// GetSection returns section by given name.
func (f *File) GetSection(name string) (*Section, error) {
if len(name) == 0 {
name = DEFAULT_SECTION
}
if f.BlockMode {
f.lock.RLock()
defer f.lock.RUnlock()
}
sec := f.sections[name]
if sec == nil {
return nil, fmt.Errorf("error when getting section: section '%s' not exists", name)
}
return sec, nil
}
// Section assumes named section exists and returns a zero-value when not.
func (f *File) Section(name string) *Section {
sec, err := f.GetSection(name)
if err != nil {
// It's OK here because the only possible error is empty section name,
// but if it's empty, this piece of code won't be executed.
sec, _ = f.NewSection(name)
return sec
}
return sec
}
// Section returns list of Section.
func (f *File) Sections() []*Section {
sections := make([]*Section, len(f.sectionList))
for i := range f.sectionList {
sections[i] = f.Section(f.sectionList[i])
}
return sections
}
// SectionStrings returns list of section names.
func (f *File) SectionStrings() []string {
list := make([]string, len(f.sectionList))
copy(list, f.sectionList)
return list
}
// DeleteSection deletes a section.
func (f *File) DeleteSection(name string) {
if f.BlockMode {
f.lock.Lock()
defer f.lock.Unlock()
}
if len(name) == 0 {
name = DEFAULT_SECTION
}
for i, s := range f.sectionList {
if s == name {
f.sectionList = append(f.sectionList[:i], f.sectionList[i+1:]...)
delete(f.sections, name)
return
}
}
}
func cutComment(str string) string {
i := strings.Index(str, "#")
if i == -1 {
return str
}
return str[:i]
}
func checkMultipleLines(buf *bufio.Reader, line, val, valQuote string) (string, error) {
isEnd := false
for {
next, err := buf.ReadString('\n')
if err != nil {
if err != io.EOF {
return "", err
}
isEnd = true
}
pos := strings.LastIndex(next, valQuote)
if pos > -1 {
val += next[:pos]
break
}
val += next
if isEnd {
return "", fmt.Errorf("error parsing line: missing closing key quote from '%s' to '%s'", line, next)
}
}
return val, nil
}
func checkContinuationLines(buf *bufio.Reader, val string) (string, bool, error) {
isEnd := false
for {
valLen := len(val)
if valLen == 0 || val[valLen-1] != '\\' {
break
}
val = val[:valLen-1]
next, err := buf.ReadString('\n')
if err != nil {
if err != io.EOF {
return "", isEnd, err
}
isEnd = true
}
next = strings.TrimSpace(next)
if len(next) == 0 {
break
}
val += next
}
return val, isEnd, nil
}
// parse parses data through an io.Reader.
func (f *File) parse(reader io.Reader) error {
buf := bufio.NewReader(reader)
// Handle BOM-UTF8.
// http://en.wikipedia.org/wiki/Byte_order_mark#Representations_of_byte_order_marks_by_encoding
mask, err := buf.Peek(3)
if err == nil && len(mask) >= 3 && mask[0] == 239 && mask[1] == 187 && mask[2] == 191 {
buf.Read(mask)
}
count := 1
comments := ""
isEnd := false
section, err := f.NewSection(DEFAULT_SECTION)
if err != nil {
return err
}
for {
line, err := buf.ReadString('\n')
line = strings.TrimSpace(line)
length := len(line)
// Check error and ignore io.EOF just for a moment.
if err != nil {
if err != io.EOF {
return fmt.Errorf("error reading next line: %v", err)
}
// The last line of file could be an empty line.
if length == 0 {
break
}
isEnd = true
}
// Skip empty lines.
if length == 0 {
continue
}
switch {
case line[0] == '#' || line[0] == ';': // Comments.
if len(comments) == 0 {
comments = line
} else {
comments += LineBreak + line
}
continue
case line[0] == '[' && line[length-1] == ']': // New sction.
section, err = f.NewSection(strings.TrimSpace(line[1 : length-1]))
if err != nil {
return err
}
if len(comments) > 0 {
section.Comment = comments
comments = ""
}
// Reset counter.
count = 1
continue
}
// Other possibilities.
var (
i int
keyQuote string
kname string
valQuote string
val string
)
// Key name surrounded by quotes.
if line[0] == �
B965
39;"' {
if length > 6 && line[0:3] == `"""` {
keyQuote = `"""`
} else {
keyQuote = `"`
}
} else if line[0] == '`' {
keyQuote = "`"
}
if len(keyQuote) > 0 {
qLen := len(keyQuote)
pos := strings.Index(line[qLen:], keyQuote)
if pos == -1 {
return fmt.Errorf("error parsing line: missing closing key quote: %s", line)
}
pos = pos + qLen
i = strings.IndexAny(line[pos:], "=:")
if i < 0 {
return fmt.Errorf("error parsing line: key-value delimiter not found: %s", line)
} else if i == pos {
return fmt.Errorf("error parsing line: key is empty: %s", line)
}
i = i + pos
kname = line[qLen:pos] // Just keep spaces inside quotes.
} else {
i = strings.IndexAny(line, "=:")
if i < 0 {
return fmt.Errorf("error parsing line: key-value delimiter not found: %s", line)
} else if i == 0 {
return fmt.Errorf("error parsing line: key is empty: %s", line)
}
kname = strings.TrimSpace(line[0:i])
}
isAutoIncr := false
// Auto increment.
if kname == "-" {
isAutoIncr = true
kname = "#" + fmt.Sprint(count)
count++
}
lineRight := strings.TrimSpace(line[i+1:])
lineRightLength := len(lineRight)
firstChar := ""
if lineRightLength >= 2 {
firstChar = lineRight[0:1]
}
if firstChar == "`" {
valQuote = "`"
} else if lineRightLength >= 6 && lineRight[0:3] == `"""` {
valQuote = `"""`
}
if len(valQuote) > 0 {
qLen := len(valQuote)
pos := strings.LastIndex(lineRight[qLen:], valQuote)
// For multiple lines value.
if pos == -1 {
val = lineRight[qLen:] + "\n"
val, err = checkMultipleLines(buf, line, val, valQuote)
if err != nil {
return err
}
} else {
val = lineRight[qLen : pos+qLen]
}
} else {
val = strings.TrimSpace(cutComment(lineRight[0:]))
val, isEnd, err = checkContinuationLines(buf, val)
if err != nil {
return err
}
}
k, err := section.NewKey(kname, val)
if err != nil {
return err
}
k.isAutoIncr = isAutoIncr
if len(comments) > 0 {
k.Comment = comments
comments = ""
}
if isEnd {
break
}
}
return nil
}
// Reload reloads and parses all data sources.
func (f *File) Reload() error {
for _, s := range f.dataSources {
r, err := s.Reader()
if err != nil {
return err
}
if err = f.parse(r); err != nil {
return err
}
}
return nil
}
// Append appends one or more data sources and reloads automatically.
func (f *File) Append(source interface{}, others ...interface{}) error {
ds, err := parseDataSource(source)
if err != nil {
return err
}
f.dataSources = append(f.dataSources, ds)
for _, s := range others {
ds, err = parseDataSource(s)
if err != nil {
return err
}
f.dataSources = append(f.dataSources, ds)
}
return f.Reload()
}
// SaveTo writes content to filesystem.
func (f *File) SaveTo(filename string) (err error) {
equalSign := "="
if PrettyFormat {
equalSign = " = "
}
// Use buffer to make sure target is safe until finish encoding.
buf := bytes.NewBuffer(nil)
for i, sname := range f.sectionList {
sec := f.Section(sname)
if len(sec.Comment) > 0 {
if sec.Comment[0] != '#' && sec.Comment[0] != ';' {
sec.Comment = "; " + sec.Comment
}
if _, err = buf.WriteString(sec.Comment + LineBreak); err != nil {
return err
}
}
if i > 0 {
if _, err = buf.WriteString("[" + sname + "]" + LineBreak); err != nil {