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test_vector_utils.go
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/
test_vector_utils.go
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package test_vector_utils
import (
"encoding/json"
"github.com/consensys/gnark/frontend"
"github.com/stretchr/testify/assert"
"os"
"path/filepath"
"strconv"
"strings"
"testing"
)
// These data structures fail to equate different representations of the same number. i.e. 5 = -10/-2
// @Tabaie TODO Replace with proper lookup tables
type Map struct {
keys []frontend.Variable
values []frontend.Variable
}
func getDelta(api frontend.API, x frontend.Variable, deltaIndex int, keys []frontend.Variable) frontend.Variable {
num := frontend.Variable(1)
den := frontend.Variable(1)
for i, key := range keys {
if i != deltaIndex {
num = api.Mul(num, api.Sub(key, x))
den = api.Mul(den, api.Sub(key, keys[deltaIndex]))
}
}
return api.Div(num, den)
}
// Get returns garbage if key is not present
func (m Map) Get(api frontend.API, key frontend.Variable) frontend.Variable {
res := frontend.Variable(0)
for i := range m.keys {
deltaI := getDelta(api, key, i, m.keys)
res = api.MulAcc(res, deltaI, m.values[i])
}
return res
}
// The keys in a DoubleMap must be constant. i.e. known at setup time
type DoubleMap struct {
keys1 []frontend.Variable
keys2 []frontend.Variable
values [][]frontend.Variable
}
// Get is very inefficient. Do not use outside testing
func (m DoubleMap) Get(api frontend.API, key1, key2 frontend.Variable) frontend.Variable {
deltas1 := make([]frontend.Variable, len(m.keys1))
deltas2 := make([]frontend.Variable, len(m.keys2))
for i := range deltas1 {
deltas1[i] = getDelta(api, key1, i, m.keys1)
}
for j := range deltas2 {
deltas2[j] = getDelta(api, key2, j, m.keys2)
}
res := frontend.Variable(0)
for i := range deltas1 {
for j := range deltas2 {
if m.values[i][j] != nil {
deltaIJ := api.Mul(deltas1[i], deltas2[j], m.values[i][j])
res = api.Add(res, deltaIJ)
}
}
}
return res
}
func register[K comparable](m map[K]int, key K) {
if _, ok := m[key]; !ok {
m[key] = len(m)
}
}
func orderKeys[K comparable](order map[K]int) (ordered []K) {
ordered = make([]K, len(order))
for k, i := range order {
ordered[i] = k
}
return
}
type ElementMap struct {
single Map
double DoubleMap
}
func ReadMap(in map[string]interface{}) ElementMap {
single := Map{
keys: make([]frontend.Variable, 0),
values: make([]frontend.Variable, 0),
}
keys1 := make(map[string]int)
keys2 := make(map[string]int)
for k, v := range in {
kSep := strings.Split(k, ",")
switch len(kSep) {
case 1:
single.keys = append(single.keys, k)
single.values = append(single.values, ToVariable(v))
case 2:
register(keys1, kSep[0])
register(keys2, kSep[1])
default:
panic("too many keys")
}
}
vals := make([][]frontend.Variable, len(keys1))
for i := range vals {
vals[i] = make([]frontend.Variable, len(keys2))
}
for k, v := range in {
kSep := strings.Split(k, ",")
if len(kSep) == 2 {
i1 := keys1[kSep[0]]
i2 := keys2[kSep[1]]
vals[i1][i2] = ToVariable(v)
}
}
double := DoubleMap{
keys1: ToVariableSlice(orderKeys(keys1)),
keys2: ToVariableSlice(orderKeys(keys2)),
values: vals,
}
return ElementMap{
single: single,
double: double,
}
}
func ToVariable(v interface{}) frontend.Variable {
switch vT := v.(type) {
case float64:
return int(vT)
default:
return v
}
}
func ToVariableSlice[V any](slice []V) (variableSlice []frontend.Variable) {
variableSlice = make([]frontend.Variable, len(slice))
for i := range slice {
variableSlice[i] = ToVariable(slice[i])
}
return
}
func ToVariableSliceSlice[V any](sliceSlice [][]V) (variableSliceSlice [][]frontend.Variable) {
variableSliceSlice = make([][]frontend.Variable, len(sliceSlice))
for i := range sliceSlice {
variableSliceSlice[i] = ToVariableSlice(sliceSlice[i])
}
return
}
func ToMap(keys1, keys2, values []frontend.Variable) map[string]interface{} {
res := make(map[string]interface{}, len(keys1))
for i := range keys1 {
str := strconv.Itoa(keys1[i].(int)) + "," + strconv.Itoa(keys2[i].(int))
res[str] = values[i].(int)
}
return res
}
var MapCache = make(map[string]ElementMap) // @Tabaie: global bad?
func ElementMapFromFile(path string) (ElementMap, error) {
path, err := filepath.Abs(path)
if err != nil {
return ElementMap{}, err
}
if h, ok := MapCache[path]; ok {
return h, nil
}
var bytes []byte
if bytes, err = os.ReadFile(path); err == nil {
var asMap map[string]interface{}
if err = json.Unmarshal(bytes, &asMap); err != nil {
return ElementMap{}, err
}
res := ReadMap(asMap)
MapCache[path] = res
return res, nil
} else {
return ElementMap{}, err
}
}
type MapHash struct {
Map ElementMap
state frontend.Variable
API frontend.API
stateValid bool
}
func (m *MapHash) Sum() frontend.Variable {
return m.state
}
func (m *MapHash) Write(data ...frontend.Variable) {
for _, x := range data {
m.write(x)
}
}
func (m *MapHash) Reset() {
m.stateValid = false
}
func (m *MapHash) write(x frontend.Variable) {
if m.stateValid {
m.state = m.Map.double.Get(m.API, x, m.state)
} else {
m.state = m.Map.single.Get(m.API, x)
}
m.stateValid = true
}
func AssertSliceEqual[T comparable](t *testing.T, expected, seen []T) {
assert.Equal(t, len(expected), len(seen))
for i := range seen {
assert.True(t, expected[i] == seen[i], "@%d: %v != %v", i, expected[i], seen[i]) // assert.Equal is not strict enough when comparing pointers, i.e. it compares what they refer to
}
}
func SliceEqual[T comparable](expected, seen []T) bool {
if len(expected) != len(seen) {
return false
}
for i := range seen {
if expected[i] != seen[i] {
return false
}
}
return true
}