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ini_private.go
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ini_private.go
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package flags
import (
"bufio"
"fmt"
"io"
"os"
"reflect"
"sort"
"strings"
)
type iniValue struct {
Name string
Value string
}
type iniSection []iniValue
type ini map[string]iniSection
func readFullLine(reader *bufio.Reader) (string, error) {
var line []byte
for {
l, more, err := reader.ReadLine()
if err != nil {
return "", err
}
if line == nil && !more {
return string(l), nil
}
line = append(line, l...)
if !more {
break
}
}
return string(line), nil
}
func optionIniName(option *Option) string {
name := option.tag.Get("_read-ini-name")
if len(name) != 0 {
return name
}
name = option.tag.Get("ini-name")
if len(name) != 0 {
return name
}
return option.field.Name
}
func writeGroupIni(group *Group, namespace string, writer io.Writer, options IniOptions) {
var sname string
if len(namespace) != 0 {
sname = namespace + "." + group.ShortDescription
} else {
sname = group.ShortDescription
}
sectionwritten := false
comments := (options & IniIncludeComments) != IniNone
for _, option := range group.options {
if option.isFunc() {
continue
}
if len(option.tag.Get("no-ini")) != 0 {
continue
}
val := option.value
if (options&IniIncludeDefaults) == IniNone && option.valueIsDefault() {
continue
}
if !sectionwritten {
fmt.Fprintf(writer, "[%s]\n", sname)
sectionwritten = true
}
if comments && len(option.Description) != 0 {
fmt.Fprintf(writer, "; %s\n", option.Description)
}
oname := optionIniName(option)
commentOption := ""
if (options&(IniIncludeDefaults|IniCommentDefaults)) == IniIncludeDefaults|IniCommentDefaults && option.valueIsDefault() {
commentOption = "; "
}
switch val.Type().Kind() {
case reflect.Slice:
for idx := 0; idx < val.Len(); idx++ {
v, _ := convertToString(val.Index(idx), option.tag)
fmt.Fprintf(writer, "%s%s = %s\n", commentOption, oname, v)
}
if val.Len() == 0 {
fmt.Fprintf(writer, "; %s =\n", oname)
}
case reflect.Map:
mkeys := val.MapKeys()
keys := make([]string, len(val.MapKeys()))
kkmap := make(map[string]reflect.Value)
for i, k := range mkeys {
keys[i], _ = convertToString(k, option.tag)
kkmap[keys[i]] = k
}
sort.Strings(keys)
for _, k := range keys {
v, _ := convertToString(val.MapIndex(kkmap[k]), option.tag)
fmt.Fprintf(writer, "%s%s = %s:%s\n", commentOption, oname, k, v)
}
if val.Len() == 0 {
fmt.Fprintf(writer, "; %s =\n", oname)
}
default:
v, _ := convertToString(val, option.tag)
if len(v) != 0 {
fmt.Fprintf(writer, "%s%s = %s\n", commentOption, oname, v)
} else {
fmt.Fprintf(writer, "%s%s =\n", commentOption, oname)
}
}
if comments {
fmt.Fprintln(writer)
}
}
if sectionwritten && !comments {
fmt.Fprintln(writer)
}
}
func writeCommandIni(command *Command, namespace string, writer io.Writer, options IniOptions) {
command.eachGroup(func(group *Group) {
writeGroupIni(group, namespace, writer, options)
})
for _, c := range command.commands {
var nns string
if len(namespace) != 0 {
nns = c.Name + "." + nns
} else {
nns = c.Name
}
writeCommandIni(c, nns, writer, options)
}
}
func writeIni(parser *IniParser, writer io.Writer, options IniOptions) {
writeCommandIni(parser.parser.Command, "", writer, options)
}
func writeIniToFile(parser *IniParser, filename string, options IniOptions) error {
file, err := os.Create(filename)
if err != nil {
return err
}
defer file.Close()
writeIni(parser, file, options)
return nil
}
func readIniFromFile(filename string) (ini, error) {
file, err := os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
return readIni(file, filename)
}
func readIni(contents io.Reader, filename string) (ini, error) {
ret := make(ini)
reader := bufio.NewReader(contents)
// Empty global section
section := make(iniSection, 0, 10)
sectionname := ""
ret[sectionname] = section
var lineno uint
for {
line, err := readFullLine(reader)
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
lineno++
line = strings.TrimSpace(line)
// Skip empty lines and lines starting with ; (comments)
if len(line) == 0 || line[0] == ';' || line[0] == '#' {
continue
}
if line[0] == '[' {
if line[0] != '[' || line[len(line)-1] != ']' {
return nil, &IniError{
Message: "malformed section header",
File: filename,
LineNumber: lineno,
}
}
name := strings.TrimSpace(line[1 : len(line)-1])
if len(name) == 0 {
return nil, &IniError{
Message: "empty section name",
File: filename,
LineNumber: lineno,
}
}
sectionname = name
section = ret[name]
if section == nil {
section = make(iniSection, 0, 10)
ret[name] = section
}
continue
}
// Parse option here
keyval := strings.SplitN(line, "=", 2)
if len(keyval) != 2 {
return nil, &IniError{
Message: fmt.Sprintf("malformed key=value (%s)", line),
File: filename,
LineNumber: lineno,
}
}
name := strings.TrimSpace(keyval[0])
value := strings.TrimSpace(keyval[1])
section = append(section, iniValue{
Name: name,
Value: value,
})
ret[sectionname] = section
}
return ret, nil
}
func (i *IniParser) matchingGroups(name string) []*Group {
if len(name) == 0 {
var ret []*Group
i.parser.eachGroup(func(g *Group) {
ret = append(ret, g)
})
return ret
}
g := i.parser.groupByName(name)
if g != nil {
return []*Group{g}
}
return nil
}
func (i *IniParser) parse(ini ini) error {
p := i.parser
for name, section := range ini {
groups := i.matchingGroups(name)
if len(groups) == 0 {
return newError(
ErrUnknownGroup,
fmt.Sprintf("could not find option group `%s'", name),
)
}
for _, inival := range section {
var opt *Option
for _, group := range groups {
opt = group.optionByName(inival.Name, func(o *Option, n string) bool {
return strings.ToLower(o.tag.Get("ini-name")) == strings.ToLower(n)
})
if opt != nil && len(opt.tag.Get("no-ini")) != 0 {
opt = nil
}
if opt != nil {
break
}
}
if opt == nil {
if (p.Options & IgnoreUnknown) == None {
return newError(
ErrUnknownFlag,
fmt.Sprintf("unknown option: %s", inival.Name),
)
}
continue
}
pval := &inival.Value
if !opt.canArgument() && len(inival.Value) == 0 {
pval = nil
}
if err := opt.set(pval); err != nil {
return wrapError(err)
}
opt.tag.Set("_read-ini-name", inival.Name)
}
}
return nil
}