remove bufio

This commit is contained in:
gobwas 2016-05-16 01:01:08 +03:00
parent 131e5cbf2d
commit accfc6f397
1 changed files with 131 additions and 91 deletions

184
lexer.go
View File

@ -1,12 +1,9 @@
package glob
import (
"bufio"
"bytes"
"fmt"
"github.com/gobwas/glob/runes"
"io"
"strings"
"unicode/utf8"
)
@ -37,8 +34,6 @@ func special(c byte) bool {
return bytes.IndexByte(specials, c) != -1
}
var eof rune = 0
type itemType int
const (
@ -121,7 +116,7 @@ type item struct {
}
func (i item) String() string {
return fmt.Sprintf("%v<%s>", i.t, i.s)
return fmt.Sprintf("%v<%q>", i.t, i.s)
}
type stubLexer struct {
@ -138,42 +133,91 @@ func (s *stubLexer) nextItem() (ret item) {
return
}
type items []item
func (i *items) shift() (ret item) {
ret, *i = (*i)[0], (*i)[1:]
return
}
func (i *items) push(v item) {
*i = append(*i, v)
}
func (i *items) empty() bool {
return len(*i) == 0
}
var eof rune = 0
type lexer struct {
data string
start int
pos int
current rune
items []item
err error
items items
termsLevel int
r *bufio.Reader
lastRune rune
lastRuneSize int
hasRune bool
}
func newLexer(source string) *lexer {
l := &lexer{
r: bufio.NewReader(strings.NewReader(source)),
data: source,
}
return l
}
func (l *lexer) shiftItem() (ret item) {
ret, l.items = l.items[0], l.items[1:]
func (l *lexer) peek() (r rune, w int) {
if l.pos == len(l.data) {
return eof, 0
}
r, w = utf8.DecodeRuneInString(l.data[l.pos:])
if r == utf8.RuneError {
l.errorf("could not read rune")
r = eof
w = 0
}
return
}
func (l *lexer) pushItem(i item) {
l.items = append(l.items, i)
func (l *lexer) read() rune {
if l.hasRune {
l.hasRune = false
l.seek(l.lastRuneSize)
return l.lastRune
}
func (l *lexer) hasItem() bool {
return len(l.items) > 0
}
r, s := l.peek()
l.seek(s)
l.lastRune = r
l.lastRuneSize = s
func (l *lexer) peekRune() rune {
r, _ := utf8.DecodeRuneInString(l.data[l.start:])
return r
}
func (l *lexer) seek(w int) {
l.pos += w
}
func (l *lexer) unread() {
if l.hasRune {
l.errorf("could not unread rune")
return
}
l.seek(-l.lastRuneSize)
l.hasRune = true
}
func (l *lexer) errorf(f string, v ...interface{}) {
l.err = fmt.Errorf(f, v...)
}
func (l *lexer) inTerms() bool {
return l.termsLevel > 0
}
@ -187,60 +231,57 @@ func (l *lexer) termsLeave() {
}
func (l *lexer) nextItem() item {
if l.hasItem() {
return l.shiftItem()
if l.err != nil {
return item{item_error, l.err.Error()}
}
if !l.items.empty() {
return l.items.shift()
}
r, _, err := l.r.ReadRune()
if err != nil {
switch err {
case io.EOF:
return item{item_eof, ""}
default:
return item{item_error, err.Error()}
}
l.fetchItem()
return l.nextItem()
}
switch r {
case char_terms_open:
func (l *lexer) fetchItem() {
r := l.read()
switch {
case r == eof:
l.items.push(item{item_eof, ""})
case r == char_terms_open:
l.termsEnter()
return item{item_terms_open, string(r)}
l.items.push(item{item_terms_open, string(r)})
case char_comma:
if l.inTerms() {
return item{item_separator, string(r)}
}
case r == char_comma && l.inTerms():
l.items.push(item{item_separator, string(r)})
case char_terms_close:
if l.inTerms() {
case r == char_terms_close && l.inTerms():
l.items.push(item{item_terms_close, string(r)})
l.termsLeave()
return item{item_terms_close, string(r)}
}
case char_range_open:
case r == char_range_open:
l.items.push(item{item_range_open, string(r)})
l.fetchRange()
return item{item_range_open, string(r)}
case char_single:
return item{item_single, string(r)}
case r == char_single:
l.items.push(item{item_single, string(r)})
case char_any:
b, err := l.r.Peek(1)
if err == nil && b[0] == char_any {
l.r.ReadRune()
return item{item_super, string(r) + string(r)}
}
return item{item_any, string(r)}
case r == char_any:
if l.read() == char_any {
l.items.push(item{item_super, string(r) + string(r)})
} else {
l.unread()
l.items.push(item{item_any, string(r)})
}
l.r.UnreadRune()
default:
l.unread()
breakers := []rune{char_single, char_any, char_range_open, char_terms_open}
if l.inTerms() {
breakers = append(breakers, char_terms_close, char_comma)
}
l.fetchText(breakers)
return l.nextItem()
}
}
func (l *lexer) fetchRange() {
@ -248,43 +289,42 @@ func (l *lexer) fetchRange() {
var wantClose bool
var seenNot bool
for {
r, _, err := l.r.ReadRune()
if err != nil {
l.pushItem(item{item_error, err.Error()})
r := l.read()
if r == eof {
l.errorf("unexpected end of input")
return
}
if wantClose {
if r != char_range_close {
l.pushItem(item{item_error, "expecting close range character"})
l.errorf("expected close range character")
} else {
l.pushItem(item{item_range_close, string(r)})
l.items.push(item{item_range_close, string(r)})
}
return
}
if wantHi {
l.pushItem(item{item_range_hi, string(r)})
l.items.push(item{item_range_hi, string(r)})
wantClose = true
continue
}
if !seenNot && r == char_range_not {
l.pushItem(item{item_not, string(r)})
l.items.push(item{item_not, string(r)})
seenNot = true
continue
}
b, err := l.r.Peek(1)
if err == nil && b[0] == char_range_between {
l.pushItem(item{item_range_lo, string(r)})
l.r.ReadRune()
l.pushItem(item{item_range_between, string(char_range_between)})
if n, w := l.peek(); n == char_range_between {
l.seek(w)
l.items.push(item{item_range_lo, string(r)})
l.items.push(item{item_range_between, string(n)})
wantHi = true
continue
}
l.r.UnreadRune()
l.unread() // unread first peek and fetch as text
l.fetchText([]rune{char_range_close})
wantClose = true
}
@ -296,8 +336,8 @@ func (l *lexer) fetchText(breakers []rune) {
reading:
for {
r, _, err := l.r.ReadRune()
if err != nil {
r := l.read()
if r == eof {
break
}
@ -308,7 +348,7 @@ reading:
}
if runes.IndexRune(breakers, r) != -1 {
l.r.UnreadRune()
l.unread()
break reading
}
}
@ -318,6 +358,6 @@ reading:
}
if len(data) > 0 {
l.pushItem(item{item_text, string(data)})
l.items.push(item{item_text, string(data)})
}
}