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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.Atom) {
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.Atom) {
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,
}
}
|
