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		numLimbs, hasNumLimbs := matches["numLimbs"]
 61		base, hasBase := matches["base"]
 62		if !hasNumLimbs || !hasBase {
 63			panic("Invalid BaseSumGate ID")
 64		}
 65
 66		return NewBaseSumGate(uint64(numLimbs), uint64(base))
 67	}
 68
 69	if strings.HasPrefix(gateId, "RandomAccessGate") {
 70		// Has the format "RandomAccessGate { bits: 2, num_copies: 13, num_extra_constants: 2, _phantom: PhantomData<plonky2_field::goldilocks_field::GoldilocksField> }<D=2>"
 71
 72		regEx := "RandomAccessGate { bits: (?P<bits>[0-9]+), num_copies: (?P<numCopies>[0-9]+), num_extra_constants: (?P<numExtraConstants>[0-9]+), _phantom: PhantomData<plonky2_field::goldilocks_field::GoldilocksField> }<D=(?P<base>[0-9]+)>"
 73		r, err := regexp.Compile(regEx)
 74		if err != nil {
 75			panic("Invalid RandomAccessGate regular expression")
 76		}
 77
 78		matches := getRegExMatches(r, gateId)
 79		bits, hasBits := matches["bits"]
 80		numCopies, hasNumCopies := matches["numCopies"]
 81		numExtraConstants, hasNumExtraConstants := matches["numExtraConstants"]
 82		if !hasBits || !hasNumCopies || !hasNumExtraConstants {
 83			panic("Invalid RandomAccessGate ID")
 84		}
 85
 86		return NewRandomAccessGate(uint64(bits), uint64(numCopies), uint64(numExtraConstants))
 87	}
 88
 89	if strings.HasPrefix(gateId, "ArithmeticExtension") {
 90		// Has the format "ArithmeticExtensionGate { num_ops: 10 }"
 91
 92		regEx := "ArithmeticExtensionGate { num_ops: (?P<numOps>[0-9]+) }"
 93		r, err := regexp.Compile(regEx)
 94		if err != nil {
 95			panic("Invalid ArithmeticExtensionGate regular expression")
 96		}
 97
 98		matches := getRegExMatches(r, gateId)
 99		numOps, hasNumOps := matches["numOps"]
100		if !hasNumOps {
101			panic("Invalid ArithmeticExtensionGate ID")
102		}
103
104		return NewArithmeticExtensionGate(uint64(numOps))
105	}
106
107	return nil
108	//panic(fmt.Sprintf("Unknown gate ID %s", gateId))
109}
110
111func getRegExMatches(r *regexp.Regexp, gateId string) map[string]int {
112	matches := r.FindStringSubmatch(gateId)
113	result := make(map[string]int)
114	for i, name := range r.SubexpNames() {
115		if i != 0 && name != "" {
116			value, err := strconv.Atoi(matches[i])
117			if err != nil {
118				panic("Invalid field value for \"name\": " + err.Error())
119			}
120			result[name] = value
121		}
122	}
123
124	return result
125}
126
127func (p *PlonkChip) computeFilter(
128	row uint64,
129	groupRange Range,
130	s QuadraticExtension,
131	manySelector bool,
132) QuadraticExtension {
133	product := p.qeAPI.ONE_QE
134	for i := groupRange.start; i < groupRange.end; i++ {
135		if i == uint64(row) {
136			continue
137		}
138
139		product = p.qeAPI.MulExtension(product, p.qeAPI.SubExtension(p.qeAPI.FieldToQE(NewFieldElement(i)), s))
140	}
141
142	if manySelector {
143		product = p.qeAPI.MulExtension(product, p.qeAPI.SubExtension(p.qeAPI.FieldToQE(NewFieldElement(UNUSED_SELECTOR)), s))
144	}
145
146	return product
147}
148
149func (p *PlonkChip) evalFiltered(
150	g gate,
151	vars EvaluationVars,
152	row uint64,
153	selectorIndex uint64,
154	groupRange Range,
155	numSelectors uint64,
156) []QuadraticExtension {
157	filter := p.computeFilter(row, groupRange, vars.localConstants[selectorIndex], numSelectors > 1)
158
159	vars.RemovePrefix(numSelectors)
160
161	unfiltered := g.EvalUnfiltered(p, vars)
162	for i := range unfiltered {
163		unfiltered[i] = p.qeAPI.MulExtension(unfiltered[i], filter)
164	}
165	return unfiltered
166}