checkpoint for it not working yet

pkg/asld/asld.go

@@ -6,38 +6,41 @@ package asld
 import (
 	"bytes"
 	"errors"
-	"fmt"
-	"reflect"
-	"strings"
 )
 
 const (
-	tagName = "asld"
+	tagName     = "asld"
+	omitEmpty   = "omitempty"
+	collapsible = "collapsible"
+	nullToken   = "null"
 )
 
 var (
-	ErrNoMatching        = errors.New("could not find matching")
+	ErrNoMatching          = errors.New("could not find matching")
-	ErrSyntaxError       = errors.New("syntax error")
+	ErrSyntaxError         = errors.New("syntax error")
-	ErrEntryWithoutValue = errors.New("entry without value")
+	ErrEntryWithoutValue   = errors.New("entry without value")
+	ErrMapNotStringIndexed = errors.New("map is not string indexed")
 )
 
 // assigned by init
 var (
-	byByte      map[byte]Symbol
+	stoppableByByte map[byte]SymbolInfo
-	symbolsRaw  []byte
+	stoppableRaw    []byte
-	iriPrefixes [][]byte
+	iriPrefixes     [][]byte
-	openSymbols []Symbol
+	openSymbols     []SymbolInfo
-	openRaw     []byte
+	openRaw         []byte
+	null            []byte
 )
 
 func init() {
-	byByte = map[byte]Symbol{}
+	stoppableByByte = map[byte]SymbolInfo{}
-	for _, symbol := range symbols {
+	for index, sym := range stoppable {
-		byByte[symbol.self] = symbol
+		stoppable[index].enum = symbol(index)
+		stoppableByByte[sym.self] = sym
 	}
-	symbolsRaw = make([]byte, len(symbols))
+	stoppableRaw = make([]byte, len(stoppable))
-	for index, symbol := range symbols {
+	for index, symbol := range stoppable {
-		symbolsRaw[index] = symbol.self
+		stoppableRaw[index] = symbol.self
 	}
 	iriPrefixesStrings := []string{
 		// Currently only doing https
@@ -47,70 +50,25 @@ func init() {
 	for index, prefix := range iriPrefixesStrings {
 		iriPrefixes[index] = []byte(prefix)
 	}
-	openSymbolEnums := []int{
+	openSymbolEnums := []symbol{
 		symbolOpenParen, symbolOpenArray, symbolString,
 	}
-	openSymbols = make([]Symbol, len(openSymbolEnums))
+	openSymbols = make([]SymbolInfo, len(openSymbolEnums))
 	for index, enum := range openSymbolEnums {
-		openSymbols[index] = symbols[enum]
+		openSymbols[index] = stoppable[enum]
 	}
-	openRaw = _map(openSymbols, func(s Symbol) byte {
+	openRaw = _map(openSymbols, func(s SymbolInfo) byte {
 		return s.self
 	})
+	null = []byte(nullToken)
 }
 
-type Symbol struct {
+type SymbolInfo struct {
 	self   byte
 	closer byte
+	enum   symbol
 }
 
-const (
-	symbolOpenParen = iota
-	symbolClosedParen
-	symbolOpenArray
-	symbolClosedArray
-	symbolString
-	symbolColon
-)
-
-const (
-	statusOK = iota
-	statusError
-	statusWalkerNotAffected
-)
-
-type status int
-type walkerStatus struct {
-	walker
-	status
-}
-
-var (
-	symbols = []Symbol{
-		symbolOpenParen: {
-			self:   '{',
-			closer: '}',
-		},
-		symbolClosedParen: {
-			self: '}',
-		},
-		symbolOpenArray: {
-			self:   '[',
-			closer: ']',
-		},
-		symbolClosedArray: {
-			self: ']',
-		},
-		symbolString: {
-			self:   '"',
-			closer: '"',
-		},
-		symbolColon: {
-			self: ':',
-		},
-	}
-)
-
 func in[T comparable](this []T, has T) bool {
 	for _, elem := range this {
 		if elem == has {
@@ -120,6 +78,15 @@ func in[T comparable](this []T, has T) bool {
 	return false
 }
 
+func firstIn[T comparable](this []T, has T) (T, bool) {
+	for _, elem := range this {
+		if elem == has {
+			return elem, true
+		}
+	}
+	return has, false
+}
+
 func _map[T any, V any](v []T, f func(T) V) []V {
 	output := make([]V, len(v))
 	for index, elem := range v {
@@ -136,170 +103,3 @@ func isIRI(v []byte) bool {
 	}
 	return false
 }
-
-func arrayMembers(w walker) ([]walker, error) {
-	var (
-		members = []walker{}
-		final   bool
-	)
-
-	elements, ok := w.SliceInner()
-	if !ok {
-		return nil, fmt.Errorf("%s %w", string(w.content[w.position]), ErrNoMatching)
-	}
-
-	for !final {
-		elem, err := elements.CommaOrEnd()
-		if err != nil {
-			return nil, fmt.Errorf("comma or end %s: %w", string(elem.content), err)
-		}
-		final = elem.status == statusWalkerNotAffected
-		value := elem.walker.Until().Reset()
-		if !final {
-			// Incremenet elem.walker.position here so
-			// that it skips over the comma that we're
-			// on right now. as there's not really anything
-			// valid to stop on in arrays aside from them
-			// so we can't just call ToNext() later.
-			elem.walker.position++
-		} else {
-			value = elem.walker
-		}
-		elements = elem.walker.Sub()
-		members = append(members, value)
-	}
-
-	return members, nil
-}
-
-func mapMembers(w walker) (map[string]walker, error) {
-	var (
-		members  = map[string]walker{}
-		lastLine bool
-	)
-	elements, ok := w.SliceInner()
-	if !ok {
-		return nil, fmt.Errorf("%s %w", string(w.content[w.position]), ErrNoMatching)
-	}
-
-	for !lastLine {
-		lineInfo, err := elements.CommaOrEnd()
-		if err != nil {
-			return nil, fmt.Errorf("comma or end: %s: %w", string(elements.content), err)
-		}
-		lastLine = lineInfo.status == statusWalkerNotAffected
-		line := lineInfo.walker
-		if !lastLine {
-			line = line.Until()
-		}
-
-		name, ok := line.Reset().ToOrStay('"')
-		if !ok {
-			continue
-		}
-		nameString, ok := name.SliceInner()
-		if !ok {
-			// TODO: maybe these should have global position
-			return nil, fmt.Errorf("%s %w", string(name.Current()), ErrNoMatching)
-		}
-
-		// We know this is OK because the above SliceInner called it
-		name, _ = name.To('"')
-
-		wNext, ok := name.Next()
-		if !ok && wNext.Current() != ':' && isIRI(nameString.content) {
-			panic("IRI expansion not implemented")
-		} else if !ok || wNext.Current() != ':' {
-			return nil, fmt.Errorf("%s: %w", string(nameString.content), ErrEntryWithoutValue)
-		}
-
-		value, ok := wNext.Next()
-		if !ok {
-			if value.position < value.len-1 {
-				value.position++
-				value = value.Sub()
-			} else {
-				return nil, fmt.Errorf("non-IRI %s: %w", string(nameString.content), ErrEntryWithoutValue)
-			}
-		}
-		elements = lineInfo.walker.Sub()
-		members[string(nameString.content)] = value
-	}
-
-	return members, nil
-}
-
-func unmarshalMap(out reflect.Value, w walker) error {
-	members, err := mapMembers(w)
-	if err != nil {
-		return fmt.Errorf("getting members: %w", err)
-	}
-
-	outType := out.Type()
-	// Deconstruct the struct fields
-	for index := 0; index < out.NumField(); index++ {
-		field := out.Field(index)
-		fType := outType.Field(index)
-
-		tagInfo := fType.Tag.Get(tagName)
-		// TODO: support expandible/collapsible/whatever I name it
-		// and omitempty probably
-		tagParts := strings.Split(tagInfo, ",")
-		name := tagParts[0]
-		if tagInfo == "" || name == "" {
-			name = fType.Name
-		}
-		// mimic encoding/json behavior
-		if name == "-" && len(tagParts) == 1 {
-			continue
-		}
-
-		wField, exists := members[name]
-		if !exists {
-			continue
-		}
-		setValue(fType, field, wField)
-	}
-
-	return nil
-}
-
-func setValue(fType reflect.StructField, field reflect.Value, w walker) error {
-	switch field.Kind() {
-	case reflect.String:
-		if w.content[0] != '"' {
-			return fmt.Errorf("%s is not a string", string(w.content))
-		}
-		field.SetString(w.String())
-	default:
-		panic("not implemented")
-	}
-
-	return nil
-}
-
-func unmarshal(out reflect.Value, w walker) error {
-	switch out.Kind() {
-	case reflect.Struct:
-		return unmarshalMap(out, w)
-	case reflect.Array, reflect.Slice:
-		// do array stuff here
-	default:
-		panic(out.Kind().String() + " not yet supported")
-	}
-
-	return nil
-}
-
-func (w walker) Reset() walker {
-	w.position = 0
-	return w
-}
-
-func Unmarshal[T any](data []byte) (T, error) {
-	tPtr := new(T)
-	tValue := reflect.Indirect(reflect.ValueOf(tPtr))
-	w := newWalker(data)
-
-	return *tPtr, unmarshal(tValue, w)
-}

pkg/asld/unmarshal.go

@@ -0,0 +1,299 @@
+package asld
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+const (
+	intSize = 32 << (^uint(0) >> 63) // unexported from "math"
+)
+
+var (
+	bitSize = map[reflect.Kind]int{
+		reflect.Int:        intSize,
+		reflect.Int8:       8,
+		reflect.Int16:      16,
+		reflect.Int32:      32,
+		reflect.Int64:      64,
+		reflect.Uint:       intSize,
+		reflect.Uint8:      8,
+		reflect.Uint16:     16,
+		reflect.Uint32:     32,
+		reflect.Uint64:     64,
+		reflect.Float32:    32,
+		reflect.Float64:    64,
+		reflect.Complex64:  64,
+		reflect.Complex128: 128,
+	}
+	nullWalker = newWalker([]byte{'n', 'u', 'l', 'l'})
+)
+
+func arrayMembers(w walker) ([]walker, error) {
+	var (
+		members = []walker{}
+		final   bool
+	)
+
+	elements, ok := w.SliceInner()
+	if !ok {
+		return nil, fmt.Errorf("%s %w", string(w.content[w.position]), ErrNoMatching)
+	}
+
+	for !final {
+		elem, err := elements.CommaOrEnd()
+		if err != nil {
+			return nil, fmt.Errorf("comma or end %s: %w", string(elem.content), err)
+		}
+		final = elem.status == statusWalkerNotAffected
+		value := elem.walker.Until().Reset()
+		if !final {
+			// Incremenet elem.walker.position here so
+			// that it skips over the comma that we're
+			// on right now. as there's not really anything
+			// valid to stop on in arrays aside from them
+			// so we can't just call ToNext() later.
+			elem.walker = elem.walker.Pos(elem.walker.position + 1)
+		} else {
+			value = elem.walker
+		}
+		elements = elem.walker.Sub()
+		members = append(members, value)
+	}
+
+	return members, nil
+}
+
+func mapMembers(w walker) (map[string]walker, error) {
+	var (
+		members  = map[string]walker{}
+		lastLine bool
+		//debug
+		prev string
+	)
+	w, sym := w.StayOrNext()
+	if sym == symbolEOB {
+		w, sym = w.StayOrNext()
+		panic("idk")
+	}
+	// Because this gets called recursively with all kinds of
+	// inputs and spacing, we should do a Stay/Walk If Space situation
+	elements, ok := w.SliceInner()
+	if !ok {
+		return nil, fmt.Errorf("%s %w", string(w.content[w.position]), ErrNoMatching)
+	}
+
+	w.Debug()
+	for !lastLine {
+		lineInfo, err := elements.CommaOrEnd()
+		if err != nil {
+			return nil, fmt.Errorf("comma or end: %s: %w", string(elements.content), err)
+		}
+		lastLine = lineInfo.status == statusWalkerNotAffected
+		line := lineInfo.walker
+		if !lastLine {
+			line = line.Until()
+		}
+
+		name, ok := line.Reset().ToOrStay('"')
+		if !ok {
+			continue
+		}
+		nameString, ok := name.SliceInner()
+		if !ok {
+			// TODO: maybe these should have global position
+			return nil, fmt.Errorf("%s %w", string(name.Current()), ErrNoMatching)
+		}
+
+		// We know this is OK because the above SliceInner called it
+		name, _ = name.To('"')
+
+		wNext, sym := name.Next()
+		if sym != symbolEOB && wNext.Current() != ':' && isIRI(nameString.content) {
+			panic("IRI expansion not implemented")
+		} else if sym != symbolEOB && wNext.Current() != ':' {
+			return nil, fmt.Errorf("%s at pos %d: %w", string(nameString.content), wNext.globPos, ErrEntryWithoutValue)
+		}
+
+		value, sym := wNext.Next()
+		if sym == symbolEOB {
+			if value.position < value.len-1 {
+				value = value.Pos(value.position + 1).Sub()
+			} else {
+				return nil, fmt.Errorf("non-IRI %s: %w", string(nameString.content), ErrEntryWithoutValue)
+			}
+		} else if sym == symbolNullStart {
+			value = nullWalker
+		}
+		// Walk to next viable token
+		value = value.WalkThroughSpaces().Sub()
+		elements = lineInfo.walker.Sub()
+		n := string(nameString.content)
+		print(n + "\n")
+		fmt.Println(value)
+		members[n] = value
+		prev = n
+	}
+
+	fmt.Print(prev)
+	return members, nil
+}
+
+func unmarshalStruct(out reflect.Value, w walker) error {
+	members, err := mapMembers(w)
+	if err != nil {
+		return fmt.Errorf("getting members: %w", err)
+	}
+
+	outType := out.Type()
+	// Deconstruct the struct fields
+	for index := 0; index < out.NumField(); index++ {
+		field := out.Field(index)
+		fType := outType.Field(index)
+
+		tagInfo := fType.Tag.Get(tagName)
+		// TODO: support expandible/collapsible/whatever I name it
+		// and omitempty probably
+		tagParts := strings.Split(tagInfo, ",")
+		name := tagParts[0]
+		if tagInfo == "" || name == "" {
+			name = fType.Name
+		}
+		// mimic encoding/json behavior
+		if name == "-" && len(tagParts) == 1 {
+			continue
+		}
+
+		wField, exists := members[name]
+		if !exists {
+			continue
+		}
+		fmt.Println(wField, field)
+		// if err := setValue(field, wField, fType); err != nil {
+		// 	return fmt.Errorf("field %s set: %w", name, err)
+		// }
+	}
+
+	return nil
+}
+
+func setMap(field reflect.Value, w walker) error {
+	if field.IsNil() {
+		field.Set(reflect.MakeMap(field.Type()))
+	}
+	keyType := field.Type().Key()
+	if keyType.Kind() != reflect.String {
+		return ErrMapNotStringIndexed
+	}
+	members, err := mapMembers(w)
+	if err != nil {
+		return fmt.Errorf("getting members for map: %w", err)
+	}
+
+	valueType := field.Type().Elem()
+	for key, member := range members {
+		def := reflect.Indirect(reflect.New(valueType))
+		err = setValue(def, member)
+		if err != nil {
+			return fmt.Errorf(
+				"could not set %s to %s: %w",
+				string(w.content),
+				valueType.Kind().String(),
+				err,
+			)
+		}
+		field.SetMapIndex(reflect.ValueOf(key), def)
+	}
+
+	return nil
+}
+
+func setValue(field reflect.Value, w walker, a ...reflect.StructField) error {
+	var (
+		err    error
+		setter func()
+	)
+	if w.len >= 4 && bytes.Equal(null, w.content[:4]) {
+		// default value
+		return nil
+	}
+
+	k := field.Kind()
+	switch k {
+	case reflect.String:
+		if w.content[0] != '"' {
+			err = fmt.Errorf("%s is not a string", string(w.content))
+		}
+		setter = func() { field.SetString(w.String()) }
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		var i int64
+		i, err = strconv.ParseInt(string(w.content), 10, bitSize[field.Kind()])
+		setter = func() { field.SetInt(i) }
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		var i uint64
+		i, err = strconv.ParseUint(string(w.content), 10, bitSize[field.Kind()])
+		setter = func() { field.SetUint(i) }
+	case reflect.Float32, reflect.Float64:
+		var f float64
+		f, err = strconv.ParseFloat(string(w.content), bitSize[field.Kind()])
+		setter = func() { field.SetFloat(f) }
+	case reflect.Complex64, reflect.Complex128:
+		var c complex128
+		c, err = strconv.ParseComplex(string(w.content), bitSize[field.Kind()])
+		setter = func() { field.SetComplex(c) }
+	case reflect.Pointer:
+		if field.IsNil() {
+			field.Set(reflect.New(field.Type().Elem()))
+		}
+		// prob oops if its nil
+		fDeref := reflect.Indirect(field)
+		return setValue(fDeref, w)
+	case reflect.Struct, reflect.Map, reflect.Array, reflect.Slice:
+		if k == reflect.Array || k == reflect.Slice && len(a) > 0 {
+			fmt.Println("$$$$$$$$$$$", a[0].Name)
+		}
+		return unmarshal(field, w)
+	case reflect.Bool:
+		var b bool
+		b, err = strconv.ParseBool(string(w.content))
+		setter = func() { field.SetBool(b) }
+	case reflect.Chan, reflect.Func, reflect.UnsafePointer:
+		// Ignore
+		return nil
+	default:
+		panic("not implemented")
+	}
+
+	if err != nil {
+		return fmt.Errorf("could not parse %s as %s: %w", string(w.content), field.Kind().String(), err)
+	}
+	setter()
+
+	return nil
+}
+
+func unmarshal(out reflect.Value, w walker) error {
+	switch out.Kind() {
+	case reflect.Struct:
+		return unmarshalStruct(out, w)
+	case reflect.Map:
+		return setMap(out, w)
+	case reflect.Array, reflect.Slice:
+		// do array stuff here
+		panic("todo")
+	default:
+		panic(out.Kind().String() + " not yet supported")
+	}
+}
+
+func Unmarshal[T any](data []byte) (T, error) {
+	tPtr := new(T)
+	tValue := reflect.Indirect(reflect.ValueOf(tPtr))
+	w := newWalker(data)
+
+	// Might be array/map/interface at top level, should check
+	return *tPtr, unmarshal(tValue, w)
+}

pkg/asld/unmarshal_test.go

@@ -2,7 +2,10 @@ package asld_test
 
 import (
 	"encoding/json"
+	"fmt"
+	"math"
 	"testing"
+	"time"
 
 	"git.sectorinf.com/emilis/asflab/pkg/asld"
 	"git.sectorinf.com/emilis/asflab/pkg/epk"
@@ -10,7 +13,38 @@ import (
 )
 
 type testObj struct {
-	String string `asld:"string" json:"string"`
+	String  string `asld:"string" json:"string"`
+	NoTag   string
+	Int     int
+	Int8    int8
+	Int16   int16
+	Int32   int32
+	Int64   int64
+	Uint    uint
+	Uint8   uint8
+	Uint16  uint16
+	Uint32  uint32
+	Uint64  uint64
+	Float32 float32
+	Float64 float64
+	// Complex64     complex64
+	// Complex128    complex128
+	IntPtr     *int
+	Int8Ptr    *int8
+	Int16Ptr   *int16
+	Int32Ptr   *int32
+	Int64Ptr   *int64
+	UintPtr    *uint
+	Uint8Ptr   *uint8
+	Uint16Ptr  *uint16
+	Uint32Ptr  *uint32
+	Uint64Ptr  *uint64
+	Float32Ptr *float32
+	Float64Ptr *float64
+	// Complex64Ptr  *complex64
+	// Complex128Ptr *complex128
+	TestPtr   *testObj
+	TestArray []testObj
 }
 
 func TestUnmarshal(t *testing.T) {
@@ -20,7 +54,40 @@ func TestUnmarshal(t *testing.T) {
 	}{
 		"string children": {
 			obj: testObj{
-				"hello",
+				String:  "hello",
+				NoTag:   "no_tag",
+				Int:     math.MaxInt,
+				Int8:    math.MaxInt8,
+				Int16:   math.MaxInt16,
+				Int32:   math.MaxInt32,
+				Int64:   math.MaxInt64,
+				Uint:    math.MaxUint,
+				Uint8:   math.MaxUint8,
+				Uint16:  math.MaxUint16,
+				Uint32:  math.MaxUint32,
+				Uint64:  math.MaxUint64,
+				Float32: math.MaxFloat32,
+				Float64: math.MaxFloat64,
+				TestPtr: &testObj{
+					String: "hello2",
+				},
+				TestArray: []testObj{
+					{
+						String: "hello3",
+					},
+					{
+						String: "hello4",
+						TestPtr: &testObj{
+							TestArray: []testObj{
+								{
+									String: "hello5",
+								},
+							},
+						},
+					},
+				},
+				// Complex64:  complex(math.MaxFloat32, math.MaxFloat32),
+				// Complex128: complex(math.MaxFloat64, math.MaxFloat64),
 			},
 		},
 	}
@@ -29,7 +96,7 @@ func TestUnmarshal(t *testing.T) {
 		test := test
 		t.Run(name, func(tt *testing.T) {
 			that := require.New(tt)
-			objJSON, err := json.Marshal(test.obj)
+			objJSON, err := json.MarshalIndent(test.obj, "", "  ")
 			that.NoError(err)
 			result, err := asld.Unmarshal[testObj](objJSON)
 			that.NoError(err)
@@ -37,3 +104,70 @@ func TestUnmarshal(t *testing.T) {
 		})
 	}
 }
+
+func TestBench(t *testing.T) {
+	obj := testObj{
+		String:  "hello",
+		NoTag:   "no_tag",
+		Int:     math.MaxInt,
+		Int8:    math.MaxInt8,
+		Int16:   math.MaxInt16,
+		Int32:   math.MaxInt32,
+		Int64:   math.MaxInt64,
+		Uint:    math.MaxUint,
+		Uint8:   math.MaxUint8,
+		Uint16:  math.MaxUint16,
+		Uint32:  math.MaxUint32,
+		Uint64:  math.MaxUint64,
+		Float32: math.MaxFloat32,
+		Float64: math.MaxFloat64,
+		// Complex64:  complex(math.MaxFloat32, math.MaxFloat32),
+		// Complex128: complex(math.MaxFloat64, math.MaxFloat64),
+	}
+	that := require.New(t)
+	asldTotal := int64(0)
+	jsonTotal := int64(0)
+
+	jsonMax := int64(0)
+	jsonMin := math.MaxInt64
+
+	asldMax := int64(0)
+	asldMin := math.MaxInt64
+
+	count := int64(1 << 20)
+	for index := int64(0); index < count; index++ {
+		objJSON, err := json.Marshal(obj)
+		that.NoError(err)
+
+		asldStart := time.Now()
+		_, err = asld.Unmarshal[testObj](objJSON)
+		asldDur := time.Since(asldStart)
+		asldTotal += int64(asldDur)
+		if asldDur < time.Duration(asldMin) {
+			asldMin = int(asldDur)
+		}
+		if asldDur > time.Duration(asldMax) {
+			asldMax = int64(asldDur)
+		}
+
+		that.NoError(err)
+		a := testObj{}
+
+		jsonStart := time.Now()
+		err = json.Unmarshal(objJSON, &a)
+		jsonDur := time.Since(jsonStart)
+		jsonTotal += int64(jsonDur)
+
+		if jsonDur < time.Duration(jsonMin) {
+			jsonMin = int(jsonDur)
+		}
+		if jsonDur > time.Duration(jsonMax) {
+			jsonMax = int64(jsonDur)
+		}
+
+		that.NoError(err)
+	}
+	fmt.Println(count, "runs")
+	fmt.Printf("json avg (%s), min (%s), max (%s)\n", time.Duration(jsonTotal/count), time.Duration(jsonMin), time.Duration(jsonMax))
+	fmt.Printf("asld avg (%s), min (%s), max (%s)\n", time.Duration(asldTotal/count), time.Duration(asldMin), time.Duration(asldMax))
+}

pkg/asld/walker.go

@@ -1,26 +1,87 @@
 package asld
 
-import "fmt"
+import (
+	"bytes"
+	"fmt"
+)
 
 // Walker.... texas ranger.
 // Except he's a cringe conservative.
 //
 // This is also cringe but not for cringe reasons.
 
-func (w walker) Debug_PRINT() {
+type symbol byte
+
+const (
+	symbolOpenParen symbol = iota
+	symbolClosedParen
+	symbolOpenArray
+	symbolClosedArray
+	symbolString
+	symbolColon
+	symbolNullStart
+	symbolEOB // End-Of-Buffer
+)
+
+const (
+	statusOK status = iota
+	statusError
+	statusWalkerNotAffected
+)
+
+var (
+	stoppable = []SymbolInfo{
+		symbolOpenParen: {
+			self:   '{',
+			closer: '}',
+		},
+		symbolClosedParen: {
+			self: '}',
+		},
+		symbolOpenArray: {
+			self:   '[',
+			closer: ']',
+		},
+		symbolClosedArray: {
+			self: ']',
+		},
+		symbolString: {
+			self:   '"',
+			closer: '"',
+		},
+		symbolColon: {
+			self: ':',
+		},
+	}
+)
+
+type status int
+type walkerStatus struct {
+	walker
+	status
+}
+
+func (w walker) Reset() walker {
+	w.position = 0
+	return w
+}
+
+func (w walker) Debug() {
 	for index, b := range w.content {
 		out := string(b)
 		if w.position == index {
-			out = "<[>" + out + "<]>"
+			out = "<[_" + out + "_]>"
 		}
 		print(out)
 	}
 	print("\n")
+	print("globPos", w.globPos)
+	print("\n")
 }
 
 func (w walker) SliceInner() (walker, bool) {
 	// the !ok scenario here is only if the code is bad
-	s, ok := byByte[w.Current()]
+	s, ok := stoppableByByte[w.Current()]
 	// Debug
 	if !ok {
 		panic(w)
@@ -34,7 +95,7 @@ func (w walker) SliceInner() (walker, bool) {
 		}
 		if curr == s.closer {
 			if height == 0 {
-				return newWalker(w.content[w.position+1 : pos]), ok
+				return w.Between(w.position+1, pos), ok
 			}
 			height--
 		}
@@ -42,6 +103,31 @@ func (w walker) SliceInner() (walker, bool) {
 	return w, false
 }
 
+type walker struct {
+	content  []byte
+	len      int
+	position int
+	globPos  int
+}
+
+func newWalker(data []byte) walker {
+	return walker{
+		content: data,
+		len:     len(data),
+	}
+}
+
+func (w walker) Between(lower, upper int) walker {
+	// As lower, and upper, are offsets from the beginning
+	// of this walker's buffer, we can diff lower and w.position
+	// for an offset to set global position at
+	w.content = w.content[lower:upper]
+	offset := lower - w.position
+	w.position = 0
+	w.globPos += offset
+	return w
+}
+
 // Sub returns a subwalker from the current position
 func (w walker) Sub() walker {
 	w.content = w.content[w.position:]
@@ -50,19 +136,6 @@ func (w walker) Sub() walker {
 	return w
 }
 
-type walker struct {
-	content  []byte
-	len      int
-	position int
-}
-
-func newWalker(data []byte) walker {
-	return walker{
-		content: data,
-		len:     len(data),
-	}
-}
-
 // Until returns a subwalker from position 0 to the current position
 func (w walker) Until() walker {
 	w.content = w.content[:w.position]
@@ -70,6 +143,13 @@ func (w walker) Until() walker {
 	return w
 }
 
+func (w walker) Pos(v int) walker {
+	offset := v - w.position
+	w.position = v
+	w.globPos += offset
+	return w
+}
+
 // ToOrStay will stay at where the walker is if b is the
 // same as the current walker position.
 //
@@ -84,26 +164,49 @@ func (w walker) ToOrStay(b byte) (walker, bool) {
 func (w walker) To(b byte) (walker, bool) {
 	for pos := w.position + 1; pos < w.len; pos++ {
 		if w.content[pos] == b {
-			w.position = pos
+			return w.Pos(pos), true
-			return w, true
 		}
 	}
 	return w, false
 }
 
-func (w walker) Next() (walker, bool) {
+func (w walker) WalkThroughSpaces() walker {
-	w, ok := w.ToNext()
+	for pos := w.position; pos < w.len; pos++ {
-	return w.Sub(), ok
+		b := w.content[pos]
+		if _, ok := stoppableByByte[b]; ok || (b >= '0' && b <= '9') || b == '-' || w.IsNullAt(pos) {
+			return w.Pos(pos)
+		}
+	}
+	return w
 }
 
-func (w walker) ToNext() (walker, bool) {
+func (w walker) StayOrNext() (walker, symbol) {
+	if sym, ok := stoppableByByte[w.content[w.position]]; ok {
+		return w, sym.enum
+	}
+
+	return w.Next()
+}
+
+func (w walker) Next() (walker, symbol) {
+	w, s := w.ToNext()
+	return w.Sub(), s
+}
+
+func (w walker) IsNullAt(pos int) bool {
+	return w.content[pos] == 'n' && w.len-pos >= 4 && bytes.Equal(w.content[pos:pos+4], null)
+}
+
+func (w walker) ToNext() (walker, symbol) {
 	for pos := w.position + 1; pos < w.len; pos++ {
-		if in(symbolsRaw, w.content[pos]) {
+		if w.IsNullAt(pos) {
-			w.position = pos
+			return w.Pos(pos), symbolNullStart
-			return w, true
+		}
+		if s, ok := stoppableByByte[w.content[pos]]; ok {
+			return w.Pos(pos), s.enum
 		}
 	}
-	return w, false
+	return w, symbolEOB
 }
 
 // CommaOrEnd walks to the next comma, or, if none
@@ -111,11 +214,11 @@ func (w walker) ToNext() (walker, bool) {
 // itself with status statusWalkerNotAffected.
 func (w walker) CommaOrEnd() (walkerStatus, error) {
 	if w.Current() == ',' {
-		w.position++
+		w = w.Pos(w.position + 1)
 	}
 	for pos := w.position; pos < w.len; pos++ {
 		if in(openRaw, w.content[pos]) {
-			sb, ok := byByte[w.content[pos]]
+			sb, ok := stoppableByByte[w.content[pos]]
 			if !ok {
 				panic("ok someone fucked up somewhere")
 			}
@@ -130,10 +233,9 @@ func (w walker) CommaOrEnd() (walkerStatus, error) {
 			continue
 		}
 		if w.content[pos] == ',' {
-			w.position = pos
 			return walkerStatus{
 				status: statusOK,
-				walker: w,
+				walker: w.Pos(pos),
 			}, nil
 		}
 	}
@@ -148,8 +250,8 @@ func (w walker) Current() byte {
 	return w.content[w.position]
 }
 
-func (w walker) CurrentSymbol() (Symbol, bool) {
+func (w walker) CurrentSymbol() (SymbolInfo, bool) {
-	b, ok := byByte[w.Current()]
+	b, ok := stoppableByByte[w.Current()]
 	return b, ok
 }
 

pkg/asld/walker_test.go

@@ -73,8 +73,8 @@ func TestNexts(t *testing.T) {
 			w := newWalker([]byte(test.contents))
 			w, ok := w.To('"')
 			that.True(ok)
-			w, ok = w.ToNext()
+			w, sym := w.ToNext()
-			that.True(ok)
+			that.Equal(symbolEOB, sym)
 			that.Equal(test.expPos, w.position, "positions are not the same")
 		})
 	}
@@ -116,7 +116,7 @@ func TestMapMembers(t *testing.T) {
 				that.NoError(err)
 				walker, exists := members[key]
 				that.True(exists)
-				that.Equal(valJson, walker.content)
+				that.Equal(valJson, walker.content, key)
 			}
 		})
 	}