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package walk
import (
"fmt"
"strings"
"unicode/utf8"
)
type valueIter struct {
values []Value
index int
}
func (iter *valueIter) Next() Edible {
if iter.index >= len(iter.values) {
return nil
}
iter.index += 1
return iter.values[iter.index - 1]
}
func NewValueIter(values []Value) StructureIter {
return &valueIter {
values: values,
index: 0,
}
}
type OutputList interface {
outputList()
}
type StructureIter interface {
Next() Edible
}
type Edible interface {
edible()
}
type Atom interface {
Edible
atom()
}
type Scalar interface {
Atom
Value
}
type Structure interface {
Value
structure()
Iter() StructureIter
}
type Value interface {
Edible
value()
Debug() string
}
type Terminal interface {
Atom
terminal()
}
type ValueList []Value
func (_ ValueList) outputList() {}
type RuneList []StringRuneAtom
func (_ RuneList) outputList() {}
type NullScalar struct{}
func (_ NullScalar) edible() {}
func (_ NullScalar) atom() {}
func (_ NullScalar) value() {}
func (_ NullScalar) Debug() string {
return "null"
}
type BoolScalar bool
func (_ BoolScalar) edible() {}
func (_ BoolScalar) atom() {}
func (_ BoolScalar) value() {}
func (b BoolScalar) Debug() string {
if b {
return "true"
}
return "false"
}
type NumberScalar float64
func (_ NumberScalar) edible() {}
func (_ NumberScalar) atom() {}
func (_ NumberScalar) value() {}
func (n NumberScalar) Debug() string {
return fmt.Sprintf("%v", float64(n))
}
type StringStructure string
func (_ StringStructure) edible() {}
func (_ StringStructure) value() {}
func (_ StringStructure) structure() {}
func (s StringStructure) Iter() StructureIter {
return &stringStructureIter {
string: string(s),
position: 0,
}
}
func (s StringStructure) Debug() string {
return fmt.Sprintf("%q", string(s))
}
type stringStructureIter struct {
string string
position int
}
func (iter *stringStructureIter) Next() Edible {
if iter.position == -1 {
return nil
}
r, width := utf8.DecodeRuneInString(iter.string[iter.position:])
if width == 0 {
iter.position = -1
return StringEndTerminal{}
}
iter.position += width
return StringRuneAtom(r)
}
type StringBeginTerminal struct{}
func (_ StringBeginTerminal) edible() {}
func (_ StringBeginTerminal) atom() {}
func (_ StringBeginTerminal) terminal() {}
type StringEndTerminal struct{}
func (_ StringEndTerminal) edible() {}
func (_ StringEndTerminal) atom() {}
func (_ StringEndTerminal) terminal() {}
type StringRuneAtom rune
func (_ StringRuneAtom) edible() {}
func (_ StringRuneAtom) atom() {}
type ArrayStructure []Value
func (_ ArrayStructure) edible() {}
func (_ ArrayStructure) value() {}
func (_ ArrayStructure) structure() {}
func (array ArrayStructure) Iter() StructureIter {
return &arrayStructureIter {
array: []Value(array),
index: 0,
}
}
func (array ArrayStructure) Debug() string {
builder := strings.Builder{}
builder.WriteRune('[')
var sep string
for _, element := range array {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%v", element))
sep = ", "
}
builder.WriteRune(']')
return builder.String()
}
type arrayStructureIter struct {
array []Value
index int
}
func (iter *arrayStructureIter) Next() Edible {
if iter.index > len(iter.array) {
return nil
}
if iter.index == len(iter.array) {
iter.index += 1
return ArrayEndTerminal{}
}
iter.index += 1
return iter.array[iter.index - 1]
}
type ArrayBeginTerminal struct{}
func (_ ArrayBeginTerminal) edible() {}
func (_ ArrayBeginTerminal) atom() {}
func (_ ArrayBeginTerminal) terminal() {}
type ArrayEndTerminal struct{}
func (_ ArrayEndTerminal) edible() {}
func (_ ArrayEndTerminal) atom() {}
func (_ ArrayEndTerminal) terminal() {}
type MapStructure map[string]Value
func (_ MapStructure) edible() {}
func (_ MapStructure) value() {}
func (_ MapStructure) structure() {}
func (m MapStructure) Debug() string {
builder := strings.Builder{}
builder.WriteRune('{')
var sep string
for key, value := range m {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%q", key))
builder.WriteString(": ")
builder.WriteString(fmt.Sprintf("%q", value))
sep = ", "
}
builder.WriteRune('}')
return builder.String()
}
type MapBeginTerminal struct{}
func (_ MapBeginTerminal) edible() {}
func (_ MapBeginTerminal) atom() {}
func (_ MapBeginTerminal) terminal() {}
type MapEndTerminal struct{}
func (_ MapEndTerminal) edible() {}
func (_ MapEndTerminal) atom() {}
func (_ MapEndTerminal) terminal() {}
type WalkItem struct {
Value ValueList
Path ValueList
}
func (item WalkItem) Debug() string {
builder := strings.Builder{}
var sep string
for _, pathSegment := range item.Path {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%s", pathSegment.Debug()))
sep = "."
}
builder.WriteString(": ")
sep = ""
for _, value := range item.Value {
builder.WriteString(sep)
builder.WriteString(fmt.Sprintf("%s", value.Debug()))
sep = ", "
}
return builder.String()
}
|
