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124 lines
2.8 KiB
Go
124 lines
2.8 KiB
Go
// Package ini provides functions for parsing INI configuration files.
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package ini
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"regexp"
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"strings"
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)
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var (
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sectionRegex = regexp.MustCompile(`^\[(.*)\]$`)
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assignRegex = regexp.MustCompile(`^([^=]+)=(.*)$`)
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)
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// ErrSyntax is returned when there is a syntax error in an INI file.
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type ErrSyntax struct {
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Line int
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Source string // The contents of the erroneous line, without leading or trailing whitespace
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}
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func (e ErrSyntax) Error() string {
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return fmt.Sprintf("invalid INI syntax on line %d: %s", e.Line, e.Source)
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}
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// A File represents a parsed INI file.
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type File map[string]Section
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// A Section represents a single section of an INI file.
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type Section map[string]string
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// Returns a named Section. A Section will be created if one does not already exist for the given name.
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func (f File) Section(name string) Section {
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section := f[name]
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if section == nil {
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section = make(Section)
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f[name] = section
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}
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return section
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}
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// Looks up a value for a key in a section and returns that value, along with a boolean result similar to a map lookup.
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func (f File) Get(section, key string) (value string, ok bool) {
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if s := f[section]; s != nil {
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value, ok = s[key]
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}
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return
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}
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// Loads INI data from a reader and stores the data in the File.
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func (f File) Load(in io.Reader) (err error) {
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bufin, ok := in.(*bufio.Reader)
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if !ok {
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bufin = bufio.NewReader(in)
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}
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return parseFile(bufin, f)
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}
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// Loads INI data from a named file and stores the data in the File.
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func (f File) LoadFile(file string) (err error) {
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in, err := os.Open(file)
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if err != nil {
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return
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}
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defer in.Close()
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return f.Load(in)
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}
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func parseFile(in *bufio.Reader, file File) (err error) {
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section := ""
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lineNum := 0
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for done := false; !done; {
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var line string
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if line, err = in.ReadString('\n'); err != nil {
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if err == io.EOF {
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done = true
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} else {
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return
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}
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}
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lineNum++
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line = strings.TrimSpace(line)
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if len(line) == 0 {
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// Skip blank lines
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continue
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}
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if line[0] == ';' || line[0] == '#' {
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// Skip comments
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continue
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}
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if groups := assignRegex.FindStringSubmatch(line); groups != nil {
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key, val := groups[1], groups[2]
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key, val = strings.TrimSpace(key), strings.TrimSpace(val)
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file.Section(section)[key] = val
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} else if groups := sectionRegex.FindStringSubmatch(line); groups != nil {
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name := strings.TrimSpace(groups[1])
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section = name
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// Create the section if it does not exist
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file.Section(section)
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} else {
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return ErrSyntax{lineNum, line}
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}
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}
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return nil
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}
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// Loads and returns a File from a reader.
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func Load(in io.Reader) (File, error) {
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file := make(File)
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err := file.Load(in)
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return file, err
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}
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// Loads and returns an INI File from a file on disk.
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func LoadFile(filename string) (File, error) {
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file := make(File)
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err := file.LoadFile(filename)
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return file, err
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}
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