forked from mirror/gjson
added stack frame. faster
This commit is contained in:
Josh Baker
parent
f4afb106da
commit
a4005bcf0f
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@ -103,7 +103,7 @@ result.Raw // holds the raw json
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Benchmarks of GJSON alongside [encoding/json](https://golang.org/pkg/encoding/json/), [ffjson](https://github.com/pquerna/ffjson), and [EasyJSON](https://github.com/mailru/easyjson).
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```
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BenchmarkGJSONGet-8 3000000 477 ns/op 0 B/op 0 allocs/op
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BenchmarkGJSONGet-8 3000000 440 ns/op 0 B/op 0 allocs/op
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BenchmarkJSONUnmarshalMap-8 600000 10738 ns/op 3176 B/op 69 allocs/op
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BenchmarkJSONUnmarshalStruct-8 600000 11635 ns/op 1960 B/op 69 allocs/op
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BenchmarkJSONDecoder-8 300000 17193 ns/op 4864 B/op 184 allocs/op
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100
gjson.go
100
gjson.go
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@ -76,6 +76,17 @@ func (t Result) Value() interface{} {
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}
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}
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type part struct {
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wild bool
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key string
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}
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type frame struct {
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key string
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count int
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stype byte
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}
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// Get searches json for the specified path.
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// A path is in dot syntax, such as "name.last" or "age".
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// This function expects that the json is well-formed, and does not validate.
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@ -99,33 +110,44 @@ func (t Result) Value() interface{} {
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// "c?ildren.0" >> "Sara"
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//
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func Get(json string, path string) Result {
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var i, s, depth int
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var squashed string
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var key string
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var stype byte
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var count int
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var s int
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var wild bool
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var matched bool
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var parts = make([]string, 0, 4)
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var wilds = make([]bool, 0, 4)
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var keys = make([]string, 0, 4)
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var stypes = make([]byte, 0, 4)
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var counts = make([]int, 0, 4)
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var parts = make([]part, 0, 4)
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// do nothing when no path specified
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if len(path) == 0 {
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return Result{} // nothing
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}
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// parse the path. just split on the dot
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for i := 0; i < len(path); i++ {
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if path[i] == '.' {
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parts = append(parts, part{wild: wild, key: path[s:i]})
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if wild {
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wild = false
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}
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s = i + 1
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} else if path[i] == '*' || path[i] == '?' {
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wild = true
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}
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}
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parts = append(parts, part{wild: wild, key: path[s:]})
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var i, depth int
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var squashed string
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var f frame
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var matched bool
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var stack = make([]frame, 0, 4)
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depth = 1
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// look for first delimiter
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for ; i < len(json); i++ {
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if json[i] > ' ' {
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if json[i] == '{' {
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stype = '{'
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f.stype = '{'
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} else if json[i] == '[' {
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stype = '['
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f.stype = '['
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} else {
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// not a valid type
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return Result{}
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@ -135,30 +157,13 @@ func Get(json string, path string) Result {
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}
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}
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stypes = append(stypes, stype)
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counts = append(counts, count)
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// parse the path. just split on the dot
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for i := 0; i < len(path); i++ {
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if path[i] == '.' {
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parts = append(parts, path[s:i])
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wilds = append(wilds, wild)
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if wild {
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wild = false
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}
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s = i + 1
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} else if path[i] == '*' || path[i] == '?' {
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wild = true
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}
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}
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parts = append(parts, path[s:])
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wilds = append(wilds, wild)
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stack = append(stack, f)
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// search for key
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read_key:
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if stype == '[' {
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key = strconv.FormatInt(int64(count), 10)
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count++
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if f.stype == '[' {
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f.key = strconv.FormatInt(int64(f.count), 10)
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f.count++
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} else {
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for ; i < len(json); i++ {
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if json[i] == '"' {
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@ -169,7 +174,7 @@ read_key:
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s = i
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for ; i < len(json); i++ {
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if json[i] == '"' {
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key = json[s:i]
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f.key = json[s:i]
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i++
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break
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}
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@ -193,7 +198,7 @@ read_key:
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break
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}
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}
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key = unescape(json[s:i])
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f.key = unescape(json[s:i])
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i++
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break
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}
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@ -206,11 +211,11 @@ read_key:
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// we have a brand new key.
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// is it the key that we are looking for?
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if wilds[depth-1] {
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if parts[depth-1].wild {
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// it's a wildcard path element
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matched = wildcardMatch(key, parts[depth-1])
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matched = wildcardMatch(f.key, parts[depth-1].key)
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} else {
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matched = parts[depth-1] == key
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matched = parts[depth-1].key == f.key
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}
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// read to the value token
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@ -377,10 +382,8 @@ proc_val:
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// can only deep search objects
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// return Result{}
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} else {
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stype = vc
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keys = append(keys, key)
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stypes = append(stypes, stype)
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counts = append(counts, count)
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f.stype = vc
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stack = append(stack, f)
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depth++
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goto read_key
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}
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@ -416,19 +419,16 @@ proc_val:
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for ; i < len(json); i++ {
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switch json[i] {
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case '}', ']':
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if parts[depth-1] == "#" {
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return Result{Type: Number, Num: float64(count)}
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if parts[depth-1].key == "#" {
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return Result{Type: Number, Num: float64(f.count)}
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}
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// step the stack back
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depth--
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if depth == 0 {
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return Result{}
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}
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keys = keys[:len(keys)-1]
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stypes = stypes[:len(stypes)-1]
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counts = counts[:len(counts)-1]
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stype = stypes[len(stypes)-1]
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count = counts[len(counts)-1]
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stack = stack[:len(stack)-1]
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f = stack[len(stack)-1]
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case ',':
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i++
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goto read_key
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