1package plonky2_verifier
  2
  3import (
  4	. "gnark-plonky2-verifier/field"
  5	"regexp"
  6	"strconv"
  7	"strings"
  8)
  9
 10type gate interface {
 11	Id() string
 12	EvalUnfiltered(p *PlonkChip, vars EvaluationVars) []QuadraticExtension
 13}
 14
 15func GateInstanceFromId(gateId string) gate {
 16	if strings.HasPrefix(gateId, "ArithmeticGate") {
 17		numOpsRaw := strings.Split(gateId, ":")[1]
 18		numOpsRaw = strings.Split(numOpsRaw, "}")[0]
 19		numOpsRaw = strings.TrimSpace(numOpsRaw)
 20		numOps, err := strconv.Atoi(numOpsRaw)
 21		if err != nil {
 22			panic("Invalid gate ID for ArithmeticGate")
 23		}
 24		return NewArithmeticGate(uint64(numOps))
 25	}
 26
 27	if strings.HasPrefix(gateId, "ConstantGate") {
 28		numConstsRaw := strings.Split(gateId, ":")[1]
 29		numConstsRaw = strings.Split(numConstsRaw, "}")[0]
 30		numConstsRaw = strings.TrimSpace(numConstsRaw)
 31		numConsts, err := strconv.Atoi(numConstsRaw)
 32		if err != nil {
 33			panic("Invalid gate ID")
 34		}
 35		return NewConstantGate(uint64(numConsts))
 36	}
 37
 38	if gateId == "NoopGate" {
 39		return NewNoopGate()
 40	}
 41
 42	if gateId == "PublicInputGate" {
 43		return NewPublicInputGate()
 44	}
 45
 46	if strings.HasPrefix(gateId, "PoseidonGate") {
 47		return NewPoseidonGate()
 48	}
 49
 50	if strings.HasPrefix(gateId, "BaseSumGate") {
 51		// Has the format "BaseSumGate { num_limbs: 32 } + Base: 2"
 52
 53		regEx := "BaseSumGate { num_limbs: (?P<numLimbs>[0-9]+) } \\+ Base: (?P<base>[0-9]+)"
 54		r, err := regexp.Compile(regEx)
 55		if err != nil {
 56			panic("Invalid BaseSumGate regular expression")
 57		}
 58
 59		matches := getRegExMatches(r, gateId)
 60		numLimbsStr, hasNumLimbs := matches["numLimbs"]
 61		baseStr, hasBase := matches["base"]
 62		if !hasNumLimbs || !hasBase {
 63			panic("Invalid BaseSumGate ID")
 64		}
 65
 66		numLimbs, err := strconv.Atoi(numLimbsStr)
 67		if err != nil {
 68			panic("Invalid BaseSumGate ID: " + err.Error())
 69		}
 70
 71		base, err := strconv.Atoi(baseStr)
 72		if err != nil {
 73			panic("Invalid BaseSumGate ID: " + err.Error())
 74		}
 75
 76		return NewBaseSumGate(uint64(numLimbs), uint64(base))
 77	}
 78
 79	return nil
 80	//panic(fmt.Sprintf("Unknown gate ID %s", gateId))
 81}
 82
 83func getRegExMatches(r *regexp.Regexp, gateId string) map[string]string {
 84	matches := r.FindStringSubmatch(gateId)
 85	result := make(map[string]string)
 86	for i, name := range r.SubexpNames() {
 87		if i != 0 && name != "" {
 88			result[name] = matches[i]
 89		}
 90	}
 91
 92	return result
 93}
 94
 95func (p *PlonkChip) computeFilter(
 96	row uint64,
 97	groupRange Range,
 98	s QuadraticExtension,
 99	manySelector bool,
100) QuadraticExtension {
101	product := p.qeAPI.ONE_QE
102	for i := groupRange.start; i < groupRange.end; i++ {
103		if i == uint64(row) {
104			continue
105		}
106
107		product = p.qeAPI.MulExtension(product, p.qeAPI.SubExtension(p.qeAPI.FieldToQE(NewFieldElement(i)), s))
108	}
109
110	if manySelector {
111		product = p.qeAPI.MulExtension(product, p.qeAPI.SubExtension(p.qeAPI.FieldToQE(NewFieldElement(UNUSED_SELECTOR)), s))
112	}
113
114	return product
115}
116
117func (p *PlonkChip) evalFiltered(
118	g gate,
119	vars EvaluationVars,
120	row uint64,
121	selectorIndex uint64,
122	groupRange Range,
123	numSelectors uint64,
124) []QuadraticExtension {
125	filter := p.computeFilter(row, groupRange, vars.localConstants[selectorIndex], numSelectors > 1)
126
127	vars.RemovePrefix(numSelectors)
128
129	unfiltered := g.EvalUnfiltered(p, vars)
130	for i := range unfiltered {
131		unfiltered[i] = p.qeAPI.MulExtension(unfiltered[i], filter)
132	}
133	return unfiltered
134}