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Beego/config/ini.go

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package config
import (
"bufio"
"bytes"
"errors"
"io"
"os"
"strconv"
"strings"
"sync"
"unicode"
)
var (
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DEFAULT_SECTION = "default" // default section means if some ini items not in a section, make them in default section,
bNumComment = []byte{'#'} // number signal
bSemComment = []byte{';'} // semicolon signal
bEmpty = []byte{}
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bEqual = []byte{'='} // equal signal
bDQuote = []byte{'"'} // quote signal
sectionStart = []byte{'['} // section start signal
sectionEnd = []byte{']'} // section end signal
)
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// IniConfig implements Config to parse ini file.
type IniConfig struct {
}
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// ParseFile creates a new Config and parses the file configuration from the named file.
func (ini *IniConfig) Parse(name string) (ConfigContainer, error) {
file, err := os.Open(name)
if err != nil {
return nil, err
}
cfg := &IniConfigContainer{
file.Name(),
make(map[string]map[string]string),
make(map[string]string),
make(map[string]string),
sync.RWMutex{},
}
cfg.Lock()
defer cfg.Unlock()
defer file.Close()
var comment bytes.Buffer
buf := bufio.NewReader(file)
section := DEFAULT_SECTION
for {
line, _, err := buf.ReadLine()
if err == io.EOF {
break
}
if bytes.Equal(line, bEmpty) {
continue
}
line = bytes.TrimSpace(line)
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var bComment []byte
switch {
case bytes.HasPrefix(line, bNumComment):
bComment = bNumComment
case bytes.HasPrefix(line, bSemComment):
bComment = bSemComment
}
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if bComment != nil {
line = bytes.TrimLeft(line, string(bComment))
line = bytes.TrimLeftFunc(line, unicode.IsSpace)
comment.Write(line)
comment.WriteByte('\n')
continue
}
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if bytes.HasPrefix(line, sectionStart) && bytes.HasSuffix(line, sectionEnd) {
section = string(line[1 : len(line)-1])
section = strings.ToLower(section) // section name case insensitive
if comment.Len() > 0 {
cfg.sectionComment[section] = comment.String()
comment.Reset()
}
if _, ok := cfg.data[section]; !ok {
cfg.data[section] = make(map[string]string)
}
} else {
if _, ok := cfg.data[section]; !ok {
cfg.data[section] = make(map[string]string)
}
keyval := bytes.SplitN(line, bEqual, 2)
val := bytes.TrimSpace(keyval[1])
if bytes.HasPrefix(val, bDQuote) {
val = bytes.Trim(val, `"`)
}
key := string(bytes.TrimSpace(keyval[0])) // key name case insensitive
key = strings.ToLower(key)
cfg.data[section][key] = string(val)
if comment.Len() > 0 {
cfg.keycomment[section+"."+key] = comment.String()
comment.Reset()
}
}
}
return cfg, nil
}
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// A Config represents the ini configuration.
// When set and get value, support key as section:name type.
type IniConfigContainer struct {
filename string
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data map[string]map[string]string // section=> key:val
sectionComment map[string]string // section : comment
keycomment map[string]string // id: []{comment, key...}; id 1 is for main comment.
sync.RWMutex
}
// Bool returns the boolean value for a given key.
func (c *IniConfigContainer) Bool(key string) (bool, error) {
key = strings.ToLower(key)
return strconv.ParseBool(c.getdata(key))
}
// Int returns the integer value for a given key.
func (c *IniConfigContainer) Int(key string) (int, error) {
key = strings.ToLower(key)
return strconv.Atoi(c.getdata(key))
}
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// Int64 returns the int64 value for a given key.
func (c *IniConfigContainer) Int64(key string) (int64, error) {
key = strings.ToLower(key)
return strconv.ParseInt(c.getdata(key), 10, 64)
}
// Float returns the float value for a given key.
func (c *IniConfigContainer) Float(key string) (float64, error) {
key = strings.ToLower(key)
return strconv.ParseFloat(c.getdata(key), 64)
}
// String returns the string value for a given key.
func (c *IniConfigContainer) String(key string) string {
key = strings.ToLower(key)
return c.getdata(key)
}
// WriteValue writes a new value for key.
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// if write to one section, the key need be "section::key".
// if the section is not existed, it panics.
func (c *IniConfigContainer) Set(key, value string) error {
c.Lock()
defer c.Unlock()
if len(key) == 0 {
return errors.New("key is empty")
}
var section, k string
key = strings.ToLower(key)
sectionkey := strings.Split(key, "::")
if len(sectionkey) >= 2 {
section = sectionkey[0]
k = sectionkey[1]
} else {
section = DEFAULT_SECTION
k = sectionkey[0]
}
c.data[section][k] = value
return nil
}
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// DIY returns the raw value by a given key.
func (c *IniConfigContainer) DIY(key string) (v interface{}, err error) {
key = strings.ToLower(key)
if v, ok := c.data[key]; ok {
return v, nil
}
return v, errors.New("key not find")
}
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// section.key or key
func (c *IniConfigContainer) getdata(key string) string {
c.RLock()
defer c.RUnlock()
if len(key) == 0 {
return ""
}
var section, k string
key = strings.ToLower(key)
sectionkey := strings.Split(key, "::")
if len(sectionkey) >= 2 {
section = sectionkey[0]
k = sectionkey[1]
} else {
section = DEFAULT_SECTION
k = sectionkey[0]
}
if v, ok := c.data[section]; ok {
if vv, o := v[k]; o {
return vv
}
}
return ""
}
func init() {
Register("ini", &IniConfig{})
}