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package walk
import (
"strings"
"math"
"unicode/utf8"
)
// int or string
type PathSegment interface {}
type Path []PathSegment
func (path Path) ToWalkValues() []Value {
var values []Value
for _, segment := range path {
switch s := segment.(type) {
case int:
values = append(values, ValueNumber(s))
case string:
values = append(values, ValueString(s))
default:
panic("Invalid PathSegment")
}
}
return values
}
func PathFromWalkValues(values []Value) Path {
var segments []PathSegment
for _, value := range values {
switch v := value.(type) {
case ValueNumber:
segments = append(segments, int(math.Round(float64(v))))
case ValueString:
segments = append(segments, string(v))
default:
panic("Invalid value in path")
}
}
return segments
}
type WalkItem struct {
Value []Atom
Path []Atom
}
func ConcatData(first []Atom, second []Atom) []Atom {
res := make([]Atom, 0, len(first) + len(second))
res = append(res, first...)
res = append(res, second...)
return res
}
func Atomise(in []Value) (out []Atom) {
numAtoms := 0
for _, value := range in {
switch v := value.(type) {
case ValueTerminal, ValueNull, ValueBool, ValueNumber:
numAtoms++
case ValueString:
numAtoms += utf8.RuneCountInString(string(v)) + 2
default:
panic("Invalid WalkValue")
}
}
out = make([]Atom, 0, numAtoms)
for _, value := range in {
out = value.Atomise(out)
}
return out
}
type CompoundError int
const (
CompoundRuneOutsideString CompoundError = iota
CompoundUnknownAtom
CompoundMissingEnd
CompoundInvalidStringAtom
)
func (err CompoundError) Error() string {
switch err {
case CompoundRuneOutsideString:
return "Compound Error: Rune Outside String"
case CompoundUnknownAtom:
return "Compound Error: Unknown Atom"
case CompoundMissingEnd:
return "Compound Error: Missing End"
case CompoundInvalidStringAtom:
return "Compound Error: Invalid String Atom"
default:
panic("Invalid CompoundError")
}
}
type CompoundResult struct {
value Value
error error
}
func Compound(in []Atom) (out []Value, error error) {
numValues := 0
i := 0
inString := false
for _, atom := range in {
switch atom.Typ {
case AtomNull, AtomBool, AtomNumber, AtomTerminal:
if !inString {
numValues++
}
case AtomStringTerminal:
if inString {
numValues++
}
inString = !inString
}
}
i = 0
out = make([]Value, 0, numValues)
for {
if i >= len(in) {
break
}
atom := in[i]
i++
switch atom.Typ {
case AtomNull:
out = append(out, ValueNull{})
continue
case AtomBool:
out = append(out, ValueBool(atom.data != 0))
continue
case AtomNumber:
out = append(out, ValueNumber(math.Float64frombits(atom.data)))
continue
case AtomTerminal:
out = append(out, ValueTerminal(atom.data))
continue
case AtomStringRune:
return nil, CompoundRuneOutsideString
case AtomStringTerminal:
default:
return nil, CompoundUnknownAtom
}
// Handle string start
var builder strings.Builder
for {
if i >= len(in) {
return nil, CompoundMissingEnd
}
atom := in[i]
i++
if atom.Typ == AtomStringTerminal {
break
}
builder.WriteString(atom.String())
}
out = append(out, ValueString(builder.String()))
}
return out, nil
}
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