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package conf
import (
"io"
"os"
"bytes"
"bufio"
"strings"
)
// ReadConfigFile reads a file and returns a new configuration representation.
// This representation can be queried with GetString, etc.
func ReadConfigFile(fname string) (c *ConfigFile, err os.Error) {
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var file *os.File
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if file, err = os.Open(fname, os.O_RDONLY, 0); err != nil {
return nil, err
}
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c = NewConfigFile()
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if err = c.Read(file); err != nil {
return nil, err
}
if err = file.Close(); err != nil {
return nil, err
}
return c, nil
}
func ReadConfigBytes(conf []byte) (c *ConfigFile, err os.Error) {
buf := bytes.NewBuffer(conf)
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c = NewConfigFile()
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if err = c.Read(buf); err != nil {
return nil, err
}
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return c, err
}
// Read reads an io.Reader and returns a configuration representation. This
// representation can be queried with GetString, etc.
func (c *ConfigFile) Read(reader io.Reader) (err os.Error) {
buf := bufio.NewReader(reader)
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var section, option string
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section = "default"
for {
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l, buferr := buf.ReadString('\n') // parse line-by-line
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l = strings.TrimSpace(l)
if buferr != nil {
if buferr != os.EOF {
return err
}
if len(l) == 0 {
break
}
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}
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// switch written for readability (not performance)
switch {
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case len(l) == 0: // empty line
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continue
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case l[0] == '#': // comment
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continue
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case l[0] == ';': // comment
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continue
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case len(l) >= 3 && strings.ToLower(l[0:3]) == "rem": // comment (for windows users)
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continue
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case l[0] == '[' && l[len(l)-1] == ']': // new section
option = "" // reset multi-line value
section = strings.TrimSpace(l[1 : len(l)-1])
c.AddSection(section)
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case section == "": // not new section and no section defined so far
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return ReadError{BlankSection, l}
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default: // other alternatives
i := firstIndex(l, []byte{'=', ':'})
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switch {
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case i > 0: // option and value
i := firstIndex(l, []byte{'=', ':'})
option = strings.TrimSpace(l[0:i])
value := strings.TrimSpace(stripComments(l[i+1:]))
c.AddOption(section, option, value)
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case section != "" && option != "": // continuation of multi-line value
prev, _ := c.GetRawString(section, option)
value := strings.TrimSpace(stripComments(l))
c.AddOption(section, option, prev+"\n"+value)
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default:
return ReadError{CouldNotParse, l}
}
}
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// Reached end of file
if buferr == os.EOF {
break
}
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}
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return nil
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}