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conflex.go
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conflex.go
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package confparse
import (
"bytes"
"io"
"io/ioutil"
"regexp"
"strings"
)
type token int
const (
EOF token = iota
KEY_VALUE
SECTION
WHITESPACE
NON_VALID
COMMENT
)
const eof = rune(0)
type itemType struct {
Tok token
Values []string
}
func newItemType(tok token, vals ...string) *itemType {
item := &itemType{Values: make([]string, 0), Tok: tok}
for _, val := range vals {
item.Values = append(item.Values, val)
}
return item
}
type lexer struct {
lex *bytes.Buffer
ori []byte
runes []rune
}
func newLexer(r io.Reader) *lexer {
buf, err := ioutil.ReadAll(r)
if err != nil {
return nil
}
return &lexer{lex: bytes.NewBuffer(buf), ori: buf, runes: make([]rune, 0)}
}
func (l *lexer) Scan() *itemType {
ch := l.read()
l.runes = append(l.runes, ch)
switch {
case isWhiteSpace(ch):
l.unread()
return l.eatWspace()
case isSection(ch):
return l.eatSection()
case isValue(ch):
return l.eatKeyValue()
case isComment(ch):
l.unread()
return l.eatComment()
}
if ch == eof {
return newItemType(EOF, "")
}
return newItemType(NON_VALID, string(ch))
}
func (l *lexer) read() rune {
ch, _, err := l.lex.ReadRune()
if err != nil {
return eof
}
return ch
}
func (l *lexer) unread() { l.lex.UnreadRune() }
func (l *lexer) eatWspace() *itemType {
var buf bytes.Buffer
buf.WriteRune(l.read())
for {
ch := l.read()
if ch == eof {
break
}
if !isWhiteSpace(ch) {
l.unread()
break
} else {
buf.WriteRune(ch)
}
}
return newItemType(WHITESPACE, buf.String())
}
func (l *lexer) eatKeyValue() *itemType {
var value bytes.Buffer
value.WriteRune(l.read())
for {
ch := l.read()
if ch == eof || ch == '\n' {
break
}
if isDigit(ch) || isLetter(ch) || isValid(ch) {
value.WriteRune(ch)
}
}
for i := len(l.runes) - 1; i >= 0; i-- {
if l.runes[i] == '\n' {
l.runes = l.runes[i+1:]
break
}
}
var (
count, index int
key string
)
count = strings.Count(string(l.runes), "=")
if count == 1 {
index = strings.Index(string(l.runes), "=")
key = string(l.runes[:len(l.runes)-1])
}
if count > 1 {
index = strings.LastIndex(string(l.runes[:len(l.runes)-1]), "=")
key = string(l.runes[index:])
}
return newItemType(KEY_VALUE,
strings.TrimSpace(strings.Trim(key, "=")),
strings.TrimSpace(value.String()))
}
func (l *lexer) eatComment() *itemType {
var buf bytes.Buffer
buf.WriteRune(l.read())
for {
ch := l.read()
if ch == eof || ch == '\n' {
break
} else {
buf.WriteRune(ch)
}
}
return newItemType(COMMENT, strings.TrimSpace(buf.String()))
}
func (l *lexer) eatSection() *itemType {
var buf bytes.Buffer
buf.WriteRune(l.read())
for {
ch := l.read()
if ch == eof {
break
}
if ch == ']' {
l.unread()
break
} else {
buf.WriteRune(ch)
}
}
return newItemType(SECTION, strings.TrimSpace(buf.String()))
}
func (l *lexer) findLine(word string) (int, error) {
copy := bytes.NewBuffer(l.ori)
regex, err := regexp.Compile(word)
if err != nil {
return -1, err
}
line := 0
for {
str, err := copy.ReadString('\n')
if err != nil {
return line, err
}
if ok := regex.Match([]byte(str)); ok {
return line, err
}
line++
}
}
func isWhiteSpace(ch rune) bool {
return ch == ' ' || ch == '\t' || ch == '\r'
}
func isLetter(ch rune) bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
}
func isDigit(ch rune) bool {
return (ch >= '0' && ch <= '9')
}
func isComment(ch rune) bool {
return ch == ';' || ch == '#'
}
func isValid(ch rune) bool {
return ch == '.' || ch == '@' || ch == '/' || ch == ',' || ch == '-'
}
func isValue(ch rune) bool {
return ch == '='
}
func isSection(ch rune) bool {
return ch == '['
}