Removes redundant json readers and writers

2 files changed, 0 insertions, 641 deletions

diff --git a/json_tokens/read.go b/json_tokens/read.go
deleted file mode 100644
index b0acf71..0000000
--- a/json_tokens/read.go
+++ /dev/null
@@ -1,490 +0,0 @@
-package json_tokens
-
-import (
-	"main/walk"
-	"bufio"
-	"strings"
-	"strconv"
-	"fmt"
-)
-
-type ReadAction int
-const (
-	ActionReadValue ReadAction = iota
-	ActionAppendPath
-	ActionPopPath
-	ActionIncrementPath
-	ActionAppendPathNull
-)
-
-type JSONInStructure int
-const (
-	JSONInMap JSONInStructure = iota
-	JSONInArray
-)
-
-type JSONInState int
-const (
-	JSONInValueEnd JSONInState = iota
-	JSONInValue
-	JSONInValueStart
-	JSONInString
-	JSONInKey
-)
-
-type JSONIn struct {
-	path []walk.AtomOLD
-	reader *bufio.Reader
-	structure []JSONInStructure
-	state JSONInState
-	readBuffer []walk.AtomOLD
-	readIndex int
-	readBufferCapacity int
-	actionBuffer []ReadAction
-	actionIndex int
-}
-
-func NewJSONIn(reader *bufio.Reader) *JSONIn {
-	return &JSONIn {
-		path: make([]walk.AtomOLD, 0, 256),
-		reader: reader,
-		structure: []JSONInStructure{},
-		state: JSONInValueStart,
-		readBuffer: make([]walk.AtomOLD, 0, 256),
-		readIndex: 0,
-		readBufferCapacity: 256,
-		actionBuffer: make([]ReadAction, 0, 256),
-		actionIndex: 0,
-	}
-}
-
-func isWhitespace(r rune) bool {
-	for _, ws := range " \t\r\n" {
-		if r == ws {
-			return true
-		}
-	}
-	return false
-}
-
-func isNumberRune(r rune) bool {
-	return '0' <= r && r <= '9' || r == '.'
-}
-
-func (in *JSONIn) popPath() {
-	if len(in.path) == 0 {
-		panic("Tried to pop from empty path")
-	}
-	finalAtom := in.path[len(in.path) - 1]
-	if finalAtom.Typ != walk.AtomStringTerminal {
-		in.path = in.path[:len(in.path) - 1]
-		return
-	}
-	i := len(in.path) - 2
-	for {
-		if i < 0 {
-			panic("Missing string begin in path")
-		}
-		if in.path[i].Typ == walk.AtomStringTerminal {
-			break
-		}
-		i--
-	}
-	in.path = in.path[:i]
-}
-
-func (in *JSONIn) nextNonWsRune() (rune, error) {
-	for {
-		r, _, err := in.reader.ReadRune()
-		if err != nil {
-			return 0, err
-		}
-		if !isWhitespace(r) {
-			return r, nil
-		}
-	}
-}
-
-func (in *JSONIn) requireString(criteria string) {
-	for _, r := range criteria {
-		in.require(r)
-	}
-}
-
-func (in *JSONIn) require(criterion rune) {
-	r, _, err := in.reader.ReadRune()
-	if err != nil {
-		panic("Error while reading required rune: " + err.Error())
-	}
-	if r != criterion {
-		panic("Required rune not read")
-	}
-}
-
-// Returns the first full value of a list of atoms and also a boolean to indicate if there isn't a value at the beginning
-func firstValue(atoms []walk.AtomOLD) ([]walk.AtomOLD, bool) {
-	if len(atoms) == 0 {
-		return nil, true
-	}
-	if atoms[0].Typ != walk.AtomStringTerminal {
-		return atoms[0:1], false
-	}
-	i := 1
-	for {
-		if i == len(atoms) {
-			return nil, true
-		}
-		if atoms[i].Typ == walk.AtomStringTerminal {
-			return atoms[0:i+1], false
-		}
-		i++
-	}
-}
-
-func (in *JSONIn) readValue() []walk.AtomOLD {
-	try:
-	value, incomplete := firstValue(in.readBuffer[in.readIndex:])
-	if incomplete {
-		if in.readIndex == 0 {
-			newReadBuffer := make([]walk.AtomOLD, len(in.readBuffer), in.readBufferCapacity * 2)
-			in.readBufferCapacity *= 2
-			copy(newReadBuffer, in.readBuffer)
-			in.readBuffer = newReadBuffer
-			in.fillReadBuffer()
-			goto try
-		}
-		copy(in.readBuffer, in.readBuffer[in.readIndex:])
-		in.readBuffer = in.readBuffer[:len(in.readBuffer) - in.readIndex]
-		in.readIndex = 0
-		copy(in.actionBuffer, in.actionBuffer[in.actionIndex:])
-		in.actionBuffer = in.actionBuffer[:len(in.actionBuffer) - in.actionIndex]
-		in.actionIndex = 0
-		in.fillReadBuffer()
-		goto try
-	}
-	in.readIndex += len(value)
-	return value
-}
-
-func (in *JSONIn) Read() (walk.WalkItem, error) {
-	for {
-		if in.actionIndex == len(in.actionBuffer) {
-			in.actionIndex = 0
-			in.readIndex = 0
-			in.actionBuffer = in.actionBuffer[:0]
-			in.readBuffer = in.readBuffer[:0]
-			err := in.fillReadBuffer()
-			if len(in.actionBuffer) == 0 {
-				return walk.WalkItem{}, err
-			}
-		}
-		action := in.actionBuffer[in.actionIndex]
-		in.actionIndex++
-		switch action {
-			case ActionReadValue:
-				value := in.readValue()
-				return walk.WalkItem {
-					Value: value,
-					Path: in.path,
-				}, nil
-			case ActionAppendPath:
-				value := in.readValue()
-				in.path = append(in.path, value...)
-			case ActionAppendPathNull:
-				in.path = append(in.path, walk.NewAtomNull())
-			case ActionPopPath:
-				in.popPath()
-			case ActionIncrementPath:
-				prevIndex := in.path[len(in.path) - 1]
-				if prevIndex.Typ == walk.AtomNull {
-					prevIndex = walk.NewAtomNumber(0)
-				} else if prevIndex.Typ == walk.AtomNumber {
-					prevIndex = walk.NewAtomNumber(prevIndex.Number() + 1)
-				} else {
-					panic("Invalid index in array input. Type: " + fmt.Sprintf("%v", prevIndex.Typ))
-				}
-				in.path[len(in.path) - 1] = prevIndex
-			default:
-				panic("Invalid ReadAction")
-		}
-	}
-}
-
-func (in *JSONIn) AssertDone() {
-	if len(in.structure) != 0 || in.state != JSONInValueEnd || in.readIndex < len(in.readBuffer) {
-		panic("Input ended on incomplete JSON root")
-	}
-}
-
-func (in *JSONIn) pushReadBuffer(atom walk.AtomOLD) bool {
-	in.readBuffer = append(in.readBuffer, atom)
-	return len(in.readBuffer) == in.readBufferCapacity
-}
-
-func (in *JSONIn) pushActionBuffer(action ReadAction) {
-	in.actionBuffer = append(in.actionBuffer, action)
-}
-
-// Appends to the readBuffer until it has reached capacity
-// Also appends to the actionBuffer as needed
-func (in *JSONIn) fillReadBuffer() error {
-	switch in.state {
-		case JSONInValueStart:
-			goto valueStart
-		case JSONInValue:
-			goto value
-		case JSONInValueEnd:
-			goto valueEnd
-		case JSONInString:
-			goto string
-		case JSONInKey:
-			goto key
-		default:
-			panic("Invalid JSONInState")
-	}
-	valueStart: {
-		if len(in.structure) == 0 {
-			goto value
-		}
-		innermost := in.structure[len(in.structure) - 1]
-		switch innermost {
-			case JSONInMap:
-				goto mapValue
-			case JSONInArray:
-				goto arrayValue
-			default:
-				panic("Invalid JSONInStructure")
-		}
-	}
-	value: {
-		r, err := in.nextNonWsRune()
-		if err != nil {
-			panic("Missing value in JSON")
-		}
-		switch r {
-			case 'n':
-				in.requireString("ull")
-				in.pushActionBuffer(ActionReadValue)
-				if in.pushReadBuffer(walk.NewAtomNull()) {
-					in.state = JSONInValueEnd
-					return nil
-				}
-				goto valueEnd
-			case 'f':
-				in.requireString("alse")
-				in.pushActionBuffer(ActionReadValue)
-				if in.pushReadBuffer(walk.NewAtomBool(false)) {
-					in.state = JSONInValueEnd
-					return nil
-				}
-				goto valueEnd
-			case 't':
-				in.requireString("rue")
-				in.pushActionBuffer(ActionReadValue)
-				if in.pushReadBuffer(walk.NewAtomBool(true)) {
-					in.state = JSONInValueEnd
-					return nil
-				}
-				goto valueEnd
-			case '"':
-				in.pushActionBuffer(ActionReadValue)
-				if in.pushReadBuffer(walk.NewAtomStringTerminal()) {
-					in.state = JSONInString
-					return nil
-				}
-				goto string
-			case '{':
-				in.structure = append(in.structure, JSONInMap)
-				in.pushActionBuffer(ActionReadValue)
-				in.pushActionBuffer(ActionAppendPathNull)
-				if in.pushReadBuffer(walk.NewAtomTerminal(walk.MapBegin)) {
-					in.state = JSONInValueStart
-					return nil
-				}
-				goto mapValue
-			case '[':
-				in.structure = append(in.structure, JSONInArray)
-				in.pushActionBuffer(ActionReadValue)
-				in.pushActionBuffer(ActionAppendPathNull)
-				if in.pushReadBuffer(walk.NewAtomTerminal(walk.ArrayBegin)) {
-					in.state = JSONInValueStart
-					return nil
-				}
-				goto arrayValue
-		}
-		if isNumberRune(r) {
-			var builder strings.Builder
-			builder.WriteRune(r)
-			for {
-				r, _, err = in.reader.ReadRune()
-				if err != nil {
-					break
-				}
-				if !isNumberRune(r) {
-					in.reader.UnreadRune()
-					break
-				}
-				builder.WriteRune(r)
-			}
-			number, parseError := strconv.ParseFloat(builder.String(), 64)
-			if parseError != nil {
-				panic("Invalid number")
-			}
-			in.pushActionBuffer(ActionReadValue)
-			if in.pushReadBuffer(walk.NewAtomNumber(number)) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		}
-		panic("Invalid JSON value starting with: " + string(r))
-	}
-	string: {
-		r, _, err := in.reader.ReadRune()
-		if err != nil {
-			panic("Missing closing terminal in string input: " + err.Error())
-		}
-		if r == '"' {
-			if in.pushReadBuffer(walk.NewAtomStringTerminal()) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		}
-		if r == '\\' {
-			r, _, err = in.reader.ReadRune()
-			if err != nil {
-				panic("Missing rune after \\")
-			}
-			if in.pushReadBuffer(walk.NewAtomStringRune(r)) {
-				in.state = JSONInString
-				return nil
-			}
-			goto string
-		}
-		if in.pushReadBuffer(walk.NewAtomStringRune(r)) {
-			in.state = JSONInString
-			return nil
-		}
-		goto string
-	}
-	key: {
-		var full bool
-		for {
-			r, _, err := in.reader.ReadRune()
-			if err != nil {
-				panic("Missing closing terminal in string input: " + err.Error())
-			}
-			if r == '"' {
-				full = in.pushReadBuffer(walk.NewAtomStringTerminal())
-				break
-			}
-			if r == '\\' {
-				r, _, err = in.reader.ReadRune()
-				if err != nil {
-					panic("Missing rune after \\")
-				}
-				if in.pushReadBuffer(walk.NewAtomStringRune(r)) {
-					in.state = JSONInKey
-					return nil
-				}
-				continue
-			}
-			if in.pushReadBuffer(walk.NewAtomStringRune(r)) {
-				in.state = JSONInKey
-				return nil
-			}
-			continue
-		}
-		r, err := in.nextNonWsRune()
-		if err != nil {
-			panic("Expected : got: " + err.Error())
-		}
-		if r != ':' {
-			panic("Expected : after key")
-		}
-		if full {
-			in.state = JSONInValue
-			return nil
-		}
-		goto value
-	}
-	valueEnd: {
-		r, err := in.nextNonWsRune()
-		if err != nil {
-			in.state = JSONInValueEnd
-			return err
-		}
-		if len(in.structure) == 0 {
-			panic("More input after root JSON object ends")
-		}
-		innermost := in.structure[len(in.structure) - 1]
-		if innermost == JSONInMap && r == '}' {
-			in.structure = in.structure[:len(in.structure) - 1]
-			in.pushActionBuffer(ActionPopPath)
-			in.pushActionBuffer(ActionReadValue)
-			if in.pushReadBuffer(walk.NewAtomTerminal(walk.MapEnd)) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		} else if innermost == JSONInArray && r == ']' {
-			in.structure = in.structure[:len(in.structure) - 1]
-			in.pushActionBuffer(ActionPopPath)
-			in.pushActionBuffer(ActionReadValue)
-			if in.pushReadBuffer(walk.NewAtomTerminal(walk.ArrayEnd)) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		}
-		if r != ',' {
-			panic("Expected , after JSON value, found: \"" + string(r) + "\"")
-		}
-		goto valueStart
-	}
-	mapValue: {
-		in.pushActionBuffer(ActionPopPath)
-		r, err := in.nextNonWsRune()
-		if err != nil {
-			panic("Missing value inside object")
-		}
-		if r == '}' {
-			in.structure = in.structure[:len(in.structure) - 1]
-			in.pushActionBuffer(ActionReadValue)
-			if in.pushReadBuffer(walk.NewAtomTerminal(walk.MapEnd)) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		}
-		if r != '"' {
-			panic("Expected key found something else")
-		}
-		in.pushActionBuffer(ActionAppendPath)
-		if in.pushReadBuffer(walk.NewAtomStringTerminal()) {
-			in.state = JSONInKey
-			return nil
-		}
-		goto key
-	}
-	arrayValue: {
-		r, err := in.nextNonWsRune()
-		if err != nil {
-			panic("Missing value inside array")
-		}
-		if r == ']' {
-			in.structure = in.structure[:len(in.structure) - 1]
-			in.pushActionBuffer(ActionPopPath)
-			in.pushActionBuffer(ActionReadValue)
-			if in.pushReadBuffer(walk.NewAtomTerminal(walk.ArrayEnd)) {
-				in.state = JSONInValueEnd
-				return nil
-			}
-			goto valueEnd
-		}
-		in.reader.UnreadRune()
-		in.pushActionBuffer(ActionIncrementPath)
-		goto value
-	}
-}
diff --git a/json_tokens/write.go b/json_tokens/write.go
deleted file mode 100644
index 78ed186..0000000
--- a/json_tokens/write.go
+++ /dev/null
@@ -1,151 +0,0 @@
-package json_tokens
-
-import (
-	"fmt"
-	"strings"
-	"bufio"
-	"main/walk"
-)
-
-func stringPathSegment(segment walk.PathSegment) string {
-	return fmt.Sprintf("%v", segment)
-}
-
-type JSONOutStructure int
-const (
-	JSONOutRoot JSONOutStructure = iota
-	JSONOutMap
-	JSONOutArray
-	JSONOutString
-	JSONOutValueEnd
-)
-
-type JSONOut struct {
-	structure []JSONOutStructure
-	writer *bufio.Writer
-}
-
-func (out *JSONOut) indent(adjust int) {
-	fmt.Fprint(out.writer, strings.Repeat("\t", len(out.structure) - 1 + adjust))
-}
-
-func (out *JSONOut) atomOut(key string, atom walk.AtomOLD) {
-	state := out.structure[len(out.structure) - 1]
-	switch state {
-		case JSONOutRoot, JSONOutMap, JSONOutArray:
-			switch atom.Typ {
-				case walk.AtomNull, walk.AtomBool, walk.AtomNumber:
-					out.indent(0)
-					if state == JSONOutMap {
-						fmt.Fprintf(out.writer, "%q: ", key)
-					}
-					fmt.Fprint(out.writer, atom.String())
-					out.structure = append(out.structure, JSONOutValueEnd)
-				case walk.AtomStringTerminal:
-					out.indent(0)
-					if state == JSONOutMap {
-						fmt.Fprintf(out.writer, "%q: ", key)
-					}
-					fmt.Fprint(out.writer, "\"")
-					out.structure = append(out.structure, JSONOutString)
-				case walk.AtomTerminal:
-					switch atom.Terminal() {
-						case walk.MapBegin:
-							out.indent(0)
-							if state == JSONOutMap {
-								fmt.Fprintf(out.writer, "%q: ", key)
-							}
-							fmt.Fprint(out.writer, "{\n")
-							out.structure = append(out.structure, JSONOutMap)
-						case walk.ArrayBegin:
-							out.indent(0)
-							if state == JSONOutMap {
-								fmt.Fprintf(out.writer, "%q: ", key)
-							}
-							fmt.Fprint(out.writer, "[\n")
-							out.structure = append(out.structure, JSONOutArray)
-						case walk.MapEnd:
-							out.indent(-1)
-							if state != JSONOutMap {
-								panic("Map ended while not inside a map")
-							}
-							fmt.Fprint(out.writer, "}")
-							out.structure[len(out.structure) - 1] = JSONOutValueEnd
-						case walk.ArrayEnd:
-							out.indent(-1)
-							if state != JSONOutArray {
-								panic("Array ended while not inside a array")
-							}
-							fmt.Fprint(out.writer, "]")
-							out.structure[len(out.structure) - 1] = JSONOutValueEnd
-						default:
-							panic("Invalid TerminalValue")
-					}
-				default:
-					panic("Invalid AtomType in root value")
-			}
-		case JSONOutValueEnd:
-			out.structure = out.structure[:len(out.structure) - 1]
-			underState := out.structure[len(out.structure) - 1]
-			if underState == JSONOutMap && atom.Typ == walk.AtomTerminal && atom.Terminal() == walk.MapEnd {
-				fmt.Fprint(out.writer, "\n")
-				out.indent(-1)
-				fmt.Fprint(out.writer, "}")
-				out.structure[len(out.structure) - 1] = JSONOutValueEnd
-			} else if underState == JSONOutArray && atom.Typ == walk.AtomTerminal && atom.Terminal() == walk.ArrayEnd {
-				fmt.Fprint(out.writer, "\n")
-				out.indent(-1)
-				fmt.Fprint(out.writer, "]")
-				out.structure[len(out.structure) - 1] = JSONOutValueEnd
-			} else if underState == JSONOutRoot {
-				panic("Tried to output JSON after root value has concluded")
-			} else {
-				fmt.Fprint(out.writer, ",\n")
-				out.atomOut(key, atom)
-			}
-		case JSONOutString:
-			if atom.Typ == walk.AtomStringTerminal {
-				fmt.Fprint(out.writer, "\"")
-				out.structure[len(out.structure) - 1] = JSONOutValueEnd
-			} else {
-				fmt.Fprint(out.writer, atom.String())
-			}
-		default:
-			panic("Invalid JSONOutState")
-	}
-}
-
-func (out *JSONOut) Print(path walk.Path, values []walk.AtomOLD) {
-	var segment walk.PathSegment
-	if len(path) > 0 {
-		segment = path[len(path) - 1]
-	}
-	segmentString := stringPathSegment(segment)
-	for _, atom := range values {
-		out.atomOut(segmentString, atom)
-	}
-}
-
-func (out *JSONOut) Write(item walk.WalkItem) error {
-	pathValues, err := walk.Compound(item.Path)
-	if err != nil {
-		return err
-	}
-	path := walk.PathFromWalkValues(pathValues)
-	out.Print(path, item.Value)
-	return nil
-}
-
-func (out *JSONOut) AssertDone() {
-	out.writer.Flush()
-	if len(out.structure) != 2 || out.structure[0] != JSONOutRoot || out.structure[1] != JSONOutValueEnd {
-		panic("Program ended with incomplete JSON output")
-	}
-}
-
-func NewJSONOut(writer *bufio.Writer) *JSONOut {
-	return &JSONOut {
-		structure: []JSONOutStructure{JSONOutRoot},
-		writer: writer,
-	}
-}