go/json-iterator
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speed up skip

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This commit is contained in:
Tao Wen 2016-12-06 21:28:39 +08:00
parent e5e9a13f2e
commit 4863661c51
2 changed files with 86 additions and 77 deletions
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149
jsoniter.go
View File

@ -721,43 +721,36 @@ func (iter *Iterator) ReadBool() (ret bool) {
}
func (iter *Iterator) skipTrue() {
c := iter.readByte()
if c != 'r' {
iter.ReportError("skipTrue", "expect r of true")
return
}
c = iter.readByte()
if c != 'u' {
iter.ReportError("skipTrue", "expect u of true")
return
}
c = iter.readByte()
if c != 'e' {
iter.ReportError("skipTrue", "expect e of true")
return
for {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case 'r', 'u', 'e':
continue
}
iter.head = i
return
}
if !iter.loadMore() {
return
}
}
}
func (iter *Iterator) skipFalse() {
c := iter.readByte()
if c != 'a' {
iter.ReportError("skipFalse", "expect a of false")
return
}
c = iter.readByte()
if c != 'l' {
iter.ReportError("skipFalse", "expect l of false")
return
}
c = iter.readByte()
if c != 's' {
iter.ReportError("skipFalse", "expect s of false")
return
}
c = iter.readByte()
if c != 'e' {
iter.ReportError("skipFalse", "expect e of false")
return
for {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case 'a', 'l', 's', 'e':
continue
}
iter.head = i
return
}
if !iter.loadMore() {
return
}
}
}
@ -772,28 +765,24 @@ func (iter *Iterator) ReadNull() (ret bool) {
}
func (iter *Iterator) skipNull() {
c := iter.readByte()
if c != 'u' {
iter.ReportError("skipNull", "expect u of null")
return
}
c = iter.readByte()
if c != 'l' {
iter.ReportError("skipNull", "expect l of null")
return
}
c = iter.readByte()
if c != 'l' {
iter.ReportError("skipNull", "expect l of null")
return
for {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case 'u', 'l':
continue
}
iter.head = i
return
}
if !iter.loadMore() {
return
}
}
}
func (iter *Iterator) Skip() {
c := iter.readByte()
if iter.Error != nil {
return
}
switch c {
case '"':
iter.skipString()
@ -816,38 +805,58 @@ func (iter *Iterator) Skip() {
}
func (iter *Iterator) skipString() {
for c := iter.readByte(); iter.Error == nil; c = iter.readByte() {
switch c {
case '"':
return // end of string found
case '\\':
iter.readByte() // " after \\ does not count
escaped := false
for {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case '"':
if escaped {
escaped = false
} else {
iter.head = i+1
return
}
case '\\':
escaped = !escaped
default:
escaped= false
}
}
if !iter.loadMore() {
return
}
}
}
func (iter *Iterator) skipNumber() {
for c := iter.readByte(); iter.Error == nil; c = iter.readByte() {
switch c {
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
continue
default:
iter.unreadByte()
for {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
continue
}
iter.head = i
return
}
if !iter.loadMore() {
return
}
}
}
func (iter *Iterator) skipArray() {
c := iter.nextToken()
if c == ']' {
return
} else {
iter.unreadByte()
}
for {
c := iter.nextToken()
if iter.Error != nil {
return
}
if c == ']' {
return
}
iter.unreadByte()
iter.Skip()
c = iter.nextToken()
switch c {
@ -865,9 +874,6 @@ func (iter *Iterator) skipArray() {
func (iter *Iterator) skipObject() {
c := iter.nextToken()
if iter.Error != nil {
return
}
if c == '}' {
return // end of object
} else {
@ -886,6 +892,9 @@ func (iter *Iterator) skipObject() {
return
}
iter.skipWhitespaces()
if iter.Error != nil {
return
}
iter.Skip()
c = iter.nextToken()
switch c {

14
jsoniter_skip_test.go
View File

@ -76,13 +76,13 @@ func Test_skip_empty_object(t *testing.T) {
}
func Test_skip_nested(t *testing.T) {
iter := ParseString(`[ {"a" : [{"b": "c"}], "d": 102 }, "b"]`)
iter.ReadArray()
iter.Skip()
iter.ReadArray()
if iter.ReadString() != "b" {
t.FailNow()
}
iter := ParseString(`[ {"a" : [{"b": "c"}], "d": 102 }, "b"]`)
iter.ReadArray()
iter.Skip()
iter.ReadArray()
if iter.ReadString() != "b" {
t.FailNow()
}
}
type TestResp struct {