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package walk
import (
"fmt"
"strings"
)
type PathSegment interface {}
type OutputList interface {
outputList()
}
type OutputValueList []Value
func (_ OutputValueList) outputList() {}
type OutputRuneList []rune
func (_ OutputRuneList) outputList() {}
// Can be passed to .eat on a state
type Edible interface {
edible()
}
type RuneEdible rune
func (_ RuneEdible) edible() {}
type Terminal int
const (
ArrayEnd Terminal = iota
MapEnd
StringEnd
)
func (_ Terminal) edible() {}
// Simple value
// Has a literal
type Scalar interface {
Value
scalar()
}
type Value interface {
Edible
value()
Debug() string
}
type NullValue struct{}
func (_ NullValue) value() {}
func (_ NullValue) Debug() string {
return "null"
}
func (_ NullValue) edible() {}
func (_ NullValue) scalar() {}
type BoolValue bool
func (_ BoolValue) value() {}
func (b BoolValue) Debug() string {
if b {
return "true"
}
return "false"
}
func (_ BoolValue) edible() {}
func (_ BoolValue) scalar() {}
type NumberValue float64
func (_ NumberValue) value() {}
func (n NumberValue) Debug() string {
return fmt.Sprintf("%v", float64(n))
}
func (_ NumberValue) edible() {}
func (_ NumberValue) scalar() {}
type StringValue string
func (_ StringValue) value() {}
func (s StringValue) Debug() string {
return fmt.Sprintf("%q", string(s))
}
func (_ StringValue) edible() {}
type ArrayElement struct {
Index int
Value Value
}
type ArrayValue []ArrayElement
func (_ ArrayValue) value() {}
func (array ArrayValue) Debug() string {
builder := strings.Builder{}
builder.WriteRune('[')
var sep string
for _, element := range array {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%v", element.Index))
builder.WriteString(": ")
builder.WriteString(element.Value.Debug())
sep = ", "
}
builder.WriteRune(']')
return builder.String()
}
func (_ ArrayValue) edible() {}
type MapElement struct {
Key string
Value Value
}
type MapValue []MapElement
func (_ MapValue) value() {}
func (m MapValue) Debug() string {
builder := strings.Builder{}
builder.WriteRune('{')
var sep string
for _, element := range m {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%q", element.Key))
builder.WriteString(": ")
builder.WriteString(element.Value.Debug())
sep = ", "
}
builder.WriteRune('}')
return builder.String()
}
func (_ MapValue) edible() {}
type WalkItem struct {
Value Value
Start, PrevStart, End, NextEnd bool
}
func (item WalkItem) Debug() string {
builder := strings.Builder{}
if item.Start {
builder.WriteRune('a')
}
if item.PrevStart {
builder.WriteRune('A')
}
if item.NextEnd {
builder.WriteRune('Z')
}
if item.End {
builder.WriteRune('z')
}
builder.WriteString(item.Value.Debug())
return builder.String()
}
func Merge(first Value, second Value) []Value {
switch first := first.(type) {
case NullValue:
return []Value {first, second}
case BoolValue:
return []Value {first, second}
case NumberValue:
return []Value {first, second}
case StringValue:
return []Value {first, second}
case ArrayValue:
secondArr, isArr := second.(ArrayValue)
if !isArr {
return []Value {first, second}
}
if len(first) == 0 {
return []Value {second}
}
if len(secondArr) == 0 {
return []Value {first}
}
var res ArrayValue
for _, el := range first[:len(first) - 1] {
res = append(res, el)
}
midFirst := first[len(first) - 1]
midSecond := secondArr[0]
if midFirst.Index == midSecond.Index {
for _, el := range Merge(midFirst.Value, midSecond.Value) {
res = append(res, ArrayElement {
Index: midFirst.Index,
Value: el,
})
}
} else {
res = append(res, midFirst, midSecond)
}
for _, el := range secondArr[1:] {
res = append(res, el)
}
return []Value {res}
case MapValue:
secondMap, isMap := second.(MapValue)
if !isMap {
return []Value {first, second}
}
if len(first) == 0 {
return []Value {second}
}
if len(secondMap) == 0 {
return []Value {first}
}
var res MapValue
for _, el := range first[:len(first) - 1] {
res = append(res, el)
}
midFirst := first[len(first) - 1]
midSecond := secondMap[0]
if midFirst.Key == midSecond.Key {
for _, el := range Merge(midFirst.Value, midSecond.Value) {
res = append(res, MapElement {
Key: midFirst.Key,
Value: el,
})
}
} else {
res = append(res, midFirst, midSecond)
}
for _, el := range secondMap[1:] {
res = append(res, el)
}
return []Value {res}
default:
panic("first is invalid value type")
}
}
|
