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Copy pathfile.go
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541 lines (460 loc) · 13.6 KB
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// Copyright 2017 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
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"sync"
)
// File represents a combination of one or more INI files in memory.
type File struct {
options LoadOptions
dataSources []dataSource
// Should make things safe, but sometimes doesn't matter.
BlockMode bool
lock sync.RWMutex
// To keep data in order.
sectionList []string
// To keep track of the index of a section with same name.
// This meta list is only used with non-unique section names are allowed.
sectionIndexes []int
// Actual data is stored here.
sections map[string][]*Section
NameMapper
ValueMapper
}
// newFile initializes File object with given data sources.
func newFile(dataSources []dataSource, opts LoadOptions) *File {
if len(opts.KeyValueDelimiters) == 0 {
opts.KeyValueDelimiters = "=:"
}
if len(opts.KeyValueDelimiterOnWrite) == 0 {
opts.KeyValueDelimiterOnWrite = "="
}
if len(opts.ChildSectionDelimiter) == 0 {
opts.ChildSectionDelimiter = "."
}
return &File{
BlockMode: true,
dataSources: dataSources,
sections: make(map[string][]*Section),
options: opts,
}
}
// Empty returns an empty file object.
func Empty(opts ...LoadOptions) *File {
var opt LoadOptions
if len(opts) > 0 {
opt = opts[0]
}
// Ignore error here, we are sure our data is good.
f, _ := LoadSources(opt, []byte(""))
return f
}
// NewSection creates a new section.
func (f *File) NewSection(name string) (*Section, error) {
if len(name) == 0 {
return nil, errors.New("empty section name")
}
if (f.options.Insensitive || f.options.InsensitiveSections) && name != DefaultSection {
name = strings.ToLower(name)
}
if f.BlockMode {
f.lock.Lock()
defer f.lock.Unlock()
}
if !f.options.AllowNonUniqueSections && inSlice(name, f.sectionList) {
return f.sections[name][0], nil
}
f.sectionList = append(f.sectionList, name)
// NOTE: Append to indexes must happen before appending to sections,
// otherwise index will have off-by-one problem.
f.sectionIndexes = append(f.sectionIndexes, len(f.sections[name]))
sec := newSection(f, name)
f.sections[name] = append(f.sections[name], sec)
return sec, nil
}
// NewRawSection creates a new section with an unparseable body.
func (f *File) NewRawSection(name, body string) (*Section, error) {
section, err := f.NewSection(name)
if err != nil {
return nil, err
}
section.isRawSection = true
section.rawBody = body
return section, 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) {
secs, err := f.SectionsByName(name)
if err != nil {
return nil, err
}
return secs[0], err
}
// HasSection returns true if the file contains a section with given name.
func (f *File) HasSection(name string) bool {
section, _ := f.GetSection(name)
return section != nil
}
// SectionsByName returns all sections with given name.
func (f *File) SectionsByName(name string) ([]*Section, error) {
if len(name) == 0 {
name = DefaultSection
}
if f.options.Insensitive || f.options.InsensitiveSections {
name = strings.ToLower(name)
}
if f.BlockMode {
f.lock.RLock()
defer f.lock.RUnlock()
}
secs := f.sections[name]
if len(secs) == 0 {
return nil, fmt.Errorf("section %q does not exist", name)
}
return secs, 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 {
if name == "" {
name = DefaultSection
}
sec, _ = f.NewSection(name)
return sec
}
return sec
}
// SectionWithIndex assumes named section exists and returns a new section when not.
func (f *File) SectionWithIndex(name string, index int) *Section {
secs, err := f.SectionsByName(name)
if err != nil || len(secs) <= index {
// NOTE: 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.
newSec, _ := f.NewSection(name)
return newSec
}
return secs[index]
}
// Sections returns a list of Section stored in the current instance.
func (f *File) Sections() []*Section {
if f.BlockMode {
f.lock.RLock()
defer f.lock.RUnlock()
}
sections := make([]*Section, len(f.sectionList))
for i, name := range f.sectionList {
sections[i] = f.sections[name][f.sectionIndexes[i]]
}
return sections
}
// ChildSections returns a list of child sections of given section name.
func (f *File) ChildSections(name string) []*Section {
return f.Section(name).ChildSections()
}
// 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 or all sections with given name.
func (f *File) DeleteSection(name string) {
secs, err := f.SectionsByName(name)
if err != nil {
return
}
for i := 0; i < len(secs); i++ {
// For non-unique sections, it is always needed to remove the first one so
// in the next iteration, the subsequent section continue having index 0.
// Ignoring the error as index 0 never returns an error.
_ = f.DeleteSectionWithIndex(name, 0)
}
}
// DeleteSectionWithIndex deletes a section with given name and index.
func (f *File) DeleteSectionWithIndex(name string, index int) error {
if !f.options.AllowNonUniqueSections && index != 0 {
return fmt.Errorf("delete section with non-zero index is only allowed when non-unique sections is enabled")
}
if len(name) == 0 {
name = DefaultSection
}
if f.options.Insensitive || f.options.InsensitiveSections {
name = strings.ToLower(name)
}
if f.BlockMode {
f.lock.Lock()
defer f.lock.Unlock()
}
// Count occurrences of the sections
occurrences := 0
sectionListCopy := make([]string, len(f.sectionList))
copy(sectionListCopy, f.sectionList)
for i, s := range sectionListCopy {
if s != name {
continue
}
if occurrences == index {
if len(f.sections[name]) <= 1 {
delete(f.sections, name) // The last one in the map
} else {
f.sections[name] = append(f.sections[name][:index], f.sections[name][index+1:]...)
}
// Fix section lists
f.sectionList = append(f.sectionList[:i], f.sectionList[i+1:]...)
f.sectionIndexes = append(f.sectionIndexes[:i], f.sectionIndexes[i+1:]...)
} else if occurrences > index {
// Fix the indices of all following sections with this name.
f.sectionIndexes[i-1]--
}
occurrences++
}
return nil
}
func (f *File) reload(s dataSource) error {
r, err := s.ReadCloser()
if err != nil {
return err
}
defer r.Close()
return f.parse(r)
}
// Reload reloads and parses all data sources.
func (f *File) Reload() (err error) {
for _, s := range f.dataSources {
if err = f.reload(s); err != nil {
// In loose mode, we create an empty default section for nonexistent files.
if os.IsNotExist(err) && f.options.Loose {
_ = f.parse(bytes.NewBuffer(nil))
continue
}
return err
}
if f.options.ShortCircuit {
return nil
}
}
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()
}
func (f *File) writeToBuffer(indent string) (*bytes.Buffer, error) {
equalSign := DefaultFormatLeft + f.options.KeyValueDelimiterOnWrite + DefaultFormatRight
if PrettyFormat || PrettyEqual {
equalSign = fmt.Sprintf(" %s ", f.options.KeyValueDelimiterOnWrite)
}
// Use buffer to make sure target is safe until finish encoding.
buf := bytes.NewBuffer(nil)
for i, sname := range f.sectionList {
sec := f.SectionWithIndex(sname, f.sectionIndexes[i])
if len(sec.Comment) > 0 {
// Support multiline comments
lines := strings.Split(sec.Comment, LineBreak)
for i := range lines {
if lines[i][0] != '#' && lines[i][0] != ';' {
lines[i] = "; " + lines[i]
} else {
lines[i] = lines[i][:1] + " " + strings.TrimSpace(lines[i][1:])
}
if _, err := buf.WriteString(lines[i] + LineBreak); err != nil {
return nil, err
}
}
}
if i > 0 || DefaultHeader || (i == 0 && strings.ToUpper(sec.name) != DefaultSection) {
if _, err := buf.WriteString("[" + sname + "]" + LineBreak); err != nil {
return nil, err
}
} else {
// Write nothing if default section is empty
if len(sec.keyList) == 0 {
continue
}
}
if sec.isRawSection {
if _, err := buf.WriteString(sec.rawBody); err != nil {
return nil, err
}
if PrettySection {
// Put a line between sections
if _, err := buf.WriteString(LineBreak); err != nil {
return nil, err
}
}
continue
}
// Count and generate alignment length and buffer spaces using the
// longest key. Keys may be modified if they contain certain characters so
// we need to take that into account in our calculation.
alignLength := 0
if PrettyFormat {
for _, kname := range sec.keyList {
keyLength := len(kname)
// First case will surround key by ` and second by """
if strings.Contains(kname, "\"") || strings.ContainsAny(kname, f.options.KeyValueDelimiters) {
keyLength += 2
} else if strings.Contains(kname, "`") {
keyLength += 6
}
if keyLength > alignLength {
alignLength = keyLength
}
}
}
alignSpaces := bytes.Repeat([]byte(" "), alignLength)
KeyList:
for _, kname := range sec.keyList {
key := sec.Key(kname)
if len(key.Comment) > 0 {
if len(indent) > 0 && sname != DefaultSection {
buf.WriteString(indent)
}
// Support multiline comments
lines := strings.Split(key.Comment, LineBreak)
for i := range lines {
if lines[i][0] != '#' && lines[i][0] != ';' {
lines[i] = "; " + strings.TrimSpace(lines[i])
} else {
lines[i] = lines[i][:1] + " " + strings.TrimSpace(lines[i][1:])
}
if _, err := buf.WriteString(lines[i] + LineBreak); err != nil {
return nil, err
}
}
}
if len(indent) > 0 && sname != DefaultSection {
buf.WriteString(indent)
}
switch {
case key.isAutoIncrement:
kname = "-"
case strings.Contains(kname, "\"") || strings.ContainsAny(kname, f.options.KeyValueDelimiters):
kname = "`" + kname + "`"
case strings.Contains(kname, "`"):
kname = `"""` + kname + `"""`
}
writeKeyValue := func(val string) (bool, error) {
if _, err := buf.WriteString(kname); err != nil {
return false, err
}
if key.isBooleanType {
if kname != sec.keyList[len(sec.keyList)-1] {
buf.WriteString(LineBreak)
}
return true, nil
}
// Write out alignment spaces before "=" sign
if PrettyFormat {
buf.Write(alignSpaces[:alignLength-len(kname)])
}
// In case key value contains "\n", "`", "\"", "#" or ";"
if strings.ContainsAny(val, "\n`") {
val = `"""` + val + `"""`
} else if !f.options.IgnoreInlineComment && strings.ContainsAny(val, "#;") {
val = "`" + val + "`"
} else if len(strings.TrimSpace(val)) != len(val) {
val = `"` + val + `"`
}
if _, err := buf.WriteString(equalSign + val + LineBreak); err != nil {
return false, err
}
return false, nil
}
shadows := key.ValueWithShadows()
if len(shadows) == 0 {
if _, err := writeKeyValue(""); err != nil {
return nil, err
}
}
for _, val := range shadows {
exitLoop, err := writeKeyValue(val)
if err != nil {
return nil, err
} else if exitLoop {
continue KeyList
}
}
for _, val := range key.nestedValues {
if _, err := buf.WriteString(indent + " " + val + LineBreak); err != nil {
return nil, err
}
}
}
if PrettySection {
// Put a line between sections
if _, err := buf.WriteString(LineBreak); err != nil {
return nil, err
}
}
}
return buf, nil
}
// WriteToIndent writes content into io.Writer with given indention.
// If PrettyFormat has been set to be true,
// it will align "=" sign with spaces under each section.
func (f *File) WriteToIndent(w io.Writer, indent string) (int64, error) {
buf, err := f.writeToBuffer(indent)
if err != nil {
return 0, err
}
return buf.WriteTo(w)
}
// WriteTo writes file content into io.Writer.
func (f *File) WriteTo(w io.Writer) (int64, error) {
return f.WriteToIndent(w, "")
}
// SaveToIndent writes content to file system with given value indention.
func (f *File) SaveToIndent(filename, indent string) error {
// Note: Because we are truncating with os.Create,
// so it's safer to save to a temporary file location and rename after done.
buf, err := f.writeToBuffer(indent)
if err != nil {
return err
}
return ioutil.WriteFile(filename, buf.Bytes(), 0666)
}
// SaveTo writes content to file system.
func (f *File) SaveTo(filename string) error {
return f.SaveToIndent(filename, "")
}